CN102589752A - Thermal power testing device and testing method thereof - Google Patents
Thermal power testing device and testing method thereof Download PDFInfo
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Abstract
The invention provides a thermal power testing device which is connected with a temperature control system. The temperature control system comprises a controller, a temperature sensor, a liquid return pipeline and a liquid delivery pipeline. The temperature signal detected by the temperature sensor is sent to the controller. The thermal power testing device comprises a bypass valve, a liquid return pipeline valve and a timer. The bypass valve is arranged between the liquid return pipeline and is connected with the controller. The liquid return pipeline valve is arranged in the liquid return pipeline and is connected with the controller. The timer is arranged inside the controller. The invention further provides a testing method applying the thermal power testing device. According to the invention, the testing device is additionally arranged at the existing temperature control system, the thermal power of a refrigerating and heating object can be tested online, offline testing is unnecessary to be adopted and special testing equipment is unnecessary to be developed. The testing device is simple and small in occupying area and most of the testing elements are shareable.
Description
Technical Field
The invention relates to a temperature control system, in particular to a thermal power testing device applied to the temperature control system and a testing method thereof.
Background
The temperature control system inevitably comprises heating or cooling objects, and from the control theory point of view, the temperature control system can be divided into a main control object and a controlled object. The controlled object refers to an object which is not expected to be heated or cooled in various devices, such as a motor, a circuit board, microwaves, chemical reactions and the like; the master control object refers to various control devices for balancing heating or cooling power of the controlled object, such as a refrigeration compressor, a semiconductor refrigerator, a thermal resistor and the like. These objects, which are the core components in the temperature control system and the key factors affecting the performance of the temperature control system, all relate to the test problem of the heating or cooling power of the temperature control system. For example, for a high-precision temperature control system dedicated for an integrated circuit, a heating or cooling object carried by the system changes in heating or cooling power after working for a period of time, and needs to be tested; in addition, when a fault occurs in the temperature control system or after the completion of the maintenance, it is necessary to perform a verification test on the performance of the core component (heating or cooling target).
In the prior art, a thermal conductivity type thermal power measuring device is adopted, a sample to be measured is placed in a closed sample chamber surrounded by a thermopile, heat flow generated or absorbed by the sample to be measured is uniformly transmitted from the sample chamber to the outer wall through a temperature equalizing system, a signal in direct proportion to the heat flow is generated on the thermopile, and the thermal power of the sample to be measured is obtained through measuring the magnitude of an electric signal. By adopting measures of heat insulation, temperature equalization and the like, external disturbance and thermal power measurement errors caused by different positions of samples to be measured in the sample chamber can be effectively overcome. But has the disadvantages that: the measuring device has a complex structure, the measured object can only be placed in the sample chamber for off-line calibration, and the measurement requires the system to reach a balanced state, so that the measurement time is prolonged.
In addition, the simple air conditioner refrigeration and heating capacity 'dry' test facility and the method thereof adopted by the prior art test the refrigeration or heating power of the tested air conditioner by adopting the heating or refrigeration power of the cheap frequency conversion type air conditioner and offsetting the technical means of the refrigeration or heating power of the tested air conditioner aiming at the air conditioner of a main control object, thereby simplifying the test method; the dehumidification device is used for eliminating the humidity which is a key factor influencing the refrigeration and heating quantity test, so that the measurement precision is improved; and the cheap air conditioner is adopted to replace the test equipment, so that the overall cost is low. But the disadvantage is that the online test can not be carried out, the heating power generated by the air conditioner is neglected, and an additional power balancing device is required to be equipped.
The off-line test for the thermal power of the heating or cooling object requires the construction of a separate test device, which adds additional cost and time, which is not allowed by the integrated circuit production line. The on-line test requires the test device to be as simple as possible and occupy as small space as possible, which limits the use of direct method or the construction of power balance device to perform the test of thermal power. At present, the development of a simple testing device which occupies the smallest space as possible for online testing is difficult.
Disclosure of Invention
The invention aims to provide a thermal power testing device and a testing method thereof, which aim to solve the problem that the prior art cannot carry out online testing on thermal power.
The invention provides a thermal power testing device, which is connected with a temperature control system, wherein the temperature control system comprises: controller, temperature sensor, return liquid pipeline and send the liquid pipeline, the temperature signal that temperature sensor surveyed is carried to the controller, thermal power testing arrangement includes: the bypass valve is arranged between the liquid return pipeline and the liquid feeding pipeline and is connected with the controller; the liquid return pipeline valve is arranged in the liquid return pipeline and is connected with the controller; and the timer is arranged inside the controller.
Preferably, in the thermal power testing device, the thermal power testing device further includes a liquid return temperature sensor disposed in the liquid return pipeline.
Preferably, in the thermal power testing device, the temperature sensor inputs the measured temperature of the medium in the return pipe to the controller through a return temperature sensor cable.
Preferably, in the thermal power testing device, the thermal power testing device further includes a flow sensor disposed in the liquid feeding pipe.
Preferably, in the thermal power testing apparatus, the flow sensor inputs the measured flow rate of the medium in the liquid feeding pipe to the controller through a flow sensor cable.
Preferably, in the thermal power testing apparatus, the bypass valve is connected to the controller by a bypass valve cable.
Preferably, in the thermal power testing device, the liquid return pipe valve is connected to the controller through a liquid return pipe valve cable.
Preferably, in the thermal power testing apparatus, the temperature control system further includes a controlled object, and the liquid return pipe and the liquid feeding pipe are respectively connected to the controlled object.
The invention also provides a testing method of the thermal power testing device, which comprises the following steps: selecting and starting a test mode through a controller; the controller controls the bypass valve to be opened and the liquid return pipeline valve to be closed; setting a first temperature value and a second temperature value in a controller according to the temperature range of a medium in a temperature control system; when the temperature sensor reads a first temperature value, the timer records a first moment corresponding to the first temperature value; when the temperature sensor reads a second temperature value, the timer records a second moment corresponding to the second temperature value; the controller controls the bypass valve to be closed and the liquid return pipeline valve to be opened; and calculating the thermal power value according to the first temperature value, the second temperature value and the difference value between the second moment and the first moment.
Preferably, in the testing method of the thermal power testing apparatus, the test mode includes a heating power test, a cooling power test, and a continuous test of heating and cooling powers.
The invention also provides a testing method of the thermal power testing device, which comprises the following steps: starting a temperature control system, and controlling the opening of a bypass valve and the closing of a liquid return pipeline valve by the controller; setting an initial temperature value in a controller according to the temperature range of a medium in a temperature control system, controlling the temperature, and recording the reading deviation of a temperature sensor and a liquid return temperature sensor; selecting and starting a thermal power test mode of a controlled object through a controller; the controller controls the bypass valve to be closed and the liquid return pipeline valve to be opened; recording the flow value of the flow sensor; setting an initial temperature value in a controller and controlling the temperature; running the controlled object, recording the reading of the liquid return temperature sensor, and recording the average temperature rise value of the liquid return temperature sensor when the temperature is stable; and calculating the thermal power of the controlled object according to the flow value, the reading deviation and the average temperature rise value.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the thermal power testing device provided by the invention, the testing device is attached to the existing temperature control system, so that the thermal power test of a refrigerating and heating object can be carried out on-line test, and special testing equipment for off-line test and development is not required, and the testing device is simple and occupies small space.
Meanwhile, the thermal power testing device effectively utilizes a controller, a temperature sensor and the like of the temperature control system, element sharing is realized, and resources are saved.
Furthermore, the thermal power testing device switches the loop by arranging the bypass valve and the liquid return pipeline valve in the loop, so that the thermal power tests of the main control object and the controlled object are respectively realized, and most of testing components can be shared when the thermal power tests of the main control object and the controlled object are respectively carried out.
The testing method of the thermal power testing device provided by the invention can be used for testing the heating power and the refrigerating power through the setting of the testing program, and also can be used for continuously testing the heating and refrigerating power, and the whole testing process is simple and effective without manual intervention.
Furthermore, the test data obtained by the test method provided by the invention takes time as a unified standard, and when the test is carried out at different moments or under different states, the power change degree can be obtained only by comparing the relative time of temperature rise and temperature drop.
In addition, the testing method adopted by the invention has no influence on the tested object basically by setting the testing temperature range and the bypass valve and the liquid return pipeline valve in the process of testing the thermal power of the refrigerating or heating object, and the test of a plurality of test items can be completed only by adding a corresponding test program in the controller.
Drawings
The various aspects of the present invention will become more apparent after reading the detailed description of the invention with reference to the attached drawings. Wherein,
FIG. 1 is a schematic diagram of a temperature control system;
FIG. 2 is a schematic structural diagram of a thermal power testing apparatus according to an embodiment of the present invention;
FIG. 3 is a flowchart of a testing method according to a second embodiment of the present invention;
fig. 4 is a line graph showing a correspondence relationship between the heating power test time and the set temperature;
fig. 5 is a line graph showing a correspondence relationship between the cooling power test time and the set temperature;
FIG. 6 is a flowchart of a testing method according to a third embodiment of the present invention;
FIG. 7 is a graph of the set initial temperature versus the temperature measured by the return liquid temperature sensor over time.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Like reference numerals refer to like parts throughout the description.
According to the thermal power testing device and the testing method thereof provided by the invention, the testing device is attached to the existing temperature control system, so that the thermal power test of a refrigerating and heating object can be tested on line, an off-line test and a special testing device for development are not required, the testing device is simple, the occupied space is small, and most of testing components can be shared; the thermal power testing device can measure the heating power of a main control object such as a heater and the cooling power of a refrigerator, can continuously measure the heating power and the cooling power, and can measure the thermal power of a controlled object. The thermal power testing method can be used for testing the heating power and the refrigerating power through the setting of the testing program, can also be used for continuously testing the heating and refrigerating power, does not need manual intervention in the whole testing process, and is simple and effective.
According to the thermal power testing device provided by the invention, the testing device is attached to the existing temperature control system, so that the thermal power test of a refrigerating and heating object can be carried out on-line test, and therefore, the existing temperature control system is described firstly. Specifically, refer to fig. 1, which is a schematic structural diagram of a temperature control system. As shown in fig. 1, the temperature control system includes a refrigerator 101, a heater 102, a mixed flow chamber 103, a temperature sensor 104, a hydraulic pump 105, a return fluid pipe 106, a delivery fluid pipe 107, a controlled object 108, and a controller 109. The refrigerator 101 is connected to the controller 109 through a refrigerator cable 110, the heater 102 is connected to the controller 109 through a heater cable 111, and the refrigerator 101 and the heater 102 are located inside the mixing chamber 103, the temperature sensor 104 and the hydraulic pump 105 are respectively disposed in the liquid feeding pipe 107, and the temperature sensor 104 is connected to the controller 109 through a temperature sensor cable 112, and the hydraulic pump 105 is connected to the controller 109 through a hydraulic pump cable 113. The liquid return pipe 106 and the liquid feeding pipe 107 are respectively connected to a controlled object 108.
Wherein, the temperature control process of the temperature control system is as follows: the temperature signal measured by the temperature sensor 104 is transmitted to the controller 109 through the temperature sensor cable 112, the controller 109 calculates and obtains the heating amount and the cooling amount according to an internal algorithm program, the cooling amount is output to the refrigerator 101 through the refrigerator cable 110, the heating amount is output to the heater 102 through the heater cable 111, and the temperature control of the medium is realized through the cooperative action of the refrigerator 101 and the heater 102. After being conveyed to the controlled object 108 from the liquid conveying pipeline 107, the medium returns to the mixing cavity 103 through the liquid return pipeline 106, so that the circulation liquid supply and temperature control of the controlled object 108 is realized. The medium is powered by a hydraulic pump 105, the hydraulic pump 105 is disposed in a fluid delivery conduit 107, and a control signal output by a controller 110 drives the hydraulic pump 105 through a hydraulic pump cable 114.
Example one
Fig. 2 is a schematic structural diagram of a thermal power testing apparatus according to an embodiment of the present invention, the thermal power testing apparatus being disposed on the temperature control system shown in fig. 1. Referring to fig. 2, the thermal power testing apparatus includes a bypass valve 201, and the bypass valve 201 is disposed between the liquid return pipeline 106 and the liquid feeding pipeline 107, and is connected to the controller 109; a liquid return pipe valve 202 disposed in the liquid return pipe 106 and connected to the controller 109; the timer 203 is disposed inside the controller 109.
Further, the bypass valve 201 is connected with the controller 109 through a bypass valve cable 208, the bypass valve 201 is used for controlling the connection and disconnection of the circuit between the liquid return pipeline 106 and the liquid feeding pipeline 107, and the controller 109 controls the opening or closing of the bypass valve 201; the liquid return pipeline valve 202 is connected with the controller 109 through a liquid return pipeline valve cable 209, the liquid return pipeline valve 202 is used for controlling the on-off of the liquid return pipeline 106, and the controller 109 controls the opening or closing of the liquid return pipeline valve 202. Wherein the timer 203 is used for recording the time of the temperature control process.
Further, the thermal power testing apparatus further includes a liquid return temperature sensor 204, the liquid return temperature sensor 204 is disposed in the liquid return pipeline 106, and the liquid return temperature sensor 204 inputs the measured temperature of the fluid medium in the liquid return pipeline 106 into the controller 109 through a liquid return temperature sensor cable 205.
Further, the thermal power testing apparatus further includes a flow sensor 206, the flow sensor 206 is disposed in the liquid feeding pipe 107, and the flow sensor 206 inputs the measured flow rate of the fluid medium in the liquid feeding pipe 107 to the controller 109 through a flow sensor cable 207.
In this embodiment and in several embodiments described below, the medium in the temperature control system is a fluid medium. It should be understood by those skilled in the art that the medium in the temperature control system is not limited to a fluid medium, but may be a gaseous medium.
Preferably, the thermal power testing device further comprises a human-machine interface 210, and the human-machine interface 210 is connected with the controller 109 through a human-machine interface cable 211 to send a manual instruction for local testing. And if the remote test is needed, the communication cable 212 can be used for communicating with external equipment to realize the remote control function.
The thermal power testing device is attached to the existing temperature control system, so that the thermal power test of a refrigerating and heating object can be performed on-line test without adopting off-line test and developing special testing equipment, and the testing device is simple and occupies small space; meanwhile, the testing device effectively utilizes the controller 109, the temperature sensor 104 and the like of the temperature control system, element sharing is realized, and resources are saved. Further, the thermal power testing device switches the fluid circuit by arranging the bypass valve 201 and the liquid return pipeline valve 202 in the fluid circuit, so that thermal power tests on the main control object and the controlled object are respectively realized, and most of testing components can be shared when the thermal power tests on the main control object and the controlled object are respectively carried out.
Example two
Correspondingly, the invention also provides a testing method using the thermal power testing device shown in FIG. 2. Specifically, please refer to fig. 3, which is a flowchart of a testing method according to a second embodiment of the present invention. The test method provided by the second embodiment of the invention comprises the following steps:
step S301: selecting and starting a test mode through a controller;
step S302: the controller controls the bypass valve to be opened and the liquid return pipeline valve to be closed;
step S303: setting a first temperature value and a second temperature value in a controller according to the temperature range of a fluid medium in a temperature control system;
step S304: when the temperature sensor reads a first temperature value, the timer records a first moment corresponding to the first temperature value;
step S305: when the temperature sensor reads a second temperature value, the timer records a second moment corresponding to the second temperature value;
step S306: the controller controls the bypass valve to be closed and the liquid return pipeline valve to be opened;
step S307: and calculating the thermal power value according to the first temperature value, the second temperature value and the difference value between the second moment and the first moment.
The invention can test the heating power and the refrigerating power through the setting of the test program, can also continuously test the heating and refrigerating power, does not need manual intervention in the whole test process, and is simple and effective.
Furthermore, the test data obtained by the test method provided by the invention takes time as a unified standard, and when the test is carried out at different moments or under different states, the power change degree can be obtained only by comparing the relative time of temperature rise and temperature drop.
In addition, in the process of testing the thermal power of the refrigerating or heating object, the test temperature range is set and the bypass valve 201 and the liquid return pipeline valve 202 are arranged, so that the test process has no influence on the object to be tested, and the test of a plurality of test items can be completed only by adding a corresponding test program in the controller.
Further, the test mode may be a heating power test, a cooling power test, or a continuous test of heating and cooling powers. The test method of the present invention will be described in more detail below with reference to fig. 4 and 5, which show preferred embodiments of the present invention, it being understood that a person skilled in the art may modify the invention described herein while still achieving the advantageous effects of the invention.
When the test mode in step S301 is the heating power test, the heating power testing apparatus tests the heating power of the heater 102, please refer to fig. 3 and 4, wherein fig. 4 is a line graph of the corresponding relationship between the heating power test time and the set temperature. As shown in fig. 3 and 4, first, a heating power test mode in the controller 109 is started, and the controller 109 controls the bypass valve 201 to open and the return liquid pipe valve 202 to close so as to cut off the influence of the controlled object 108 on the heating test; secondly, determining the temperature range of the fluid medium in the temperature control system, inputting an initial temperature set value Ta within the determined temperature range into a controller 109 in the temperature control system for temperature control, simultaneously starting a timer 203 and a temperature sensor 104, changing the temperature set value in the controller 109 to Td after the temperature control system is in a stable state at the time of t0, so that the heater 102 starts to work at the maximum heating power from the time of t0, and at the time, the controller 109 sends an instruction to stop the refrigerator 101; when the temperature of the fluid medium starts to rise, and when the reading of the temperature sensor 104 rises to the first temperature value Tb, the timer records a first time t1 corresponding to the first temperature value Tb, the temperature of the fluid medium continues to rise, and when the reading of the temperature sensor 104 rises to the second temperature value Tc, the timer 203 records a second time t2 corresponding to the second temperature value Tc; then, the temperature of the fluid medium rises to a temperature set value Td at time t3, the operation is carried out to time t4, the temperature control is stopped after the temperature of the temperature control system is stabilized, the controller 109 controls the bypass valve 201 to be closed, the liquid return pipeline valve 202 to be opened, and the heating power test is finished.
With continued reference to fig. 4, when the test mode in step S301 is the heating power test, the process of the temperature control system rising from the initial temperature setting value Ta to the first temperature value Tb, and the process of rising from the second temperature value Tc to the temperature setting value Td are all unstable states, and are not suitable as the process of temperature stable rising, therefore, when the test mode in step S301 is the heating power test, the time period of the temperature control system rising from the first temperature value Tb to the second temperature value Tc is selected as the valid time data, i.e. the difference between the second time t2 and the first time t1, which is denoted as the heating time th, where th is t2-t 1.
Further, the calculation formula of the heating power Ph is as follows:
Ph＝CρV(Tc-Tb)/th；
wherein C is the specific heat of the fluid, ρ is the density of the fluid, and V is the volume of the mixed flow cavity 103.
When the test mode in step S301 is the cooling power test, the thermal power testing apparatus tests the heating power of the refrigerator 101, please refer to fig. 3 and 5, wherein fig. 5 is a line graph of the corresponding relationship between the cooling power test time and the set temperature. As shown in fig. 3 and 5, when the test mode in step S301 is a cooling power test, first, the cooling power test mode in the controller 109 is started, and the controller 109 controls the bypass valve 201 to open and the return-to-liquid pipeline valve 202 to close so as to cut off the influence of the controlled object 108 on the cooling test; secondly, determining the temperature range of the fluid medium in the temperature control system, inputting an initial temperature set value Th in the determined temperature range into a controller 109 in the temperature control system for temperature control, simultaneously starting a timer 203 and a temperature sensor 104, changing the temperature set value in the controller 109 to Te after the temperature control system is in a stable state at time t0 ', so that the refrigerator 101 starts to work at the maximum refrigerating power from time t 0', and at the moment, the controller 109 sends an instruction to stop the heater 102; the temperature of the fluid medium begins to drop, when the reading of the temperature sensor 104 drops to the first temperature value Tg, the timer records a first time t1 'corresponding to the first temperature value Tg, the temperature of the fluid medium continues to drop, when the reading of the temperature sensor 104 drops to the second temperature value Tf, the timer records a second time t 2' corresponding to the second temperature value Tf; then, the temperature of the fluid medium is decreased to the temperature set value Te at time t3 ', the temperature control is stopped after the temperature of the temperature control system is stabilized by operating to time t 4', the controller 109 controls the bypass valve 201 to be closed and the liquid return pipeline valve 202 to be opened, and the refrigeration power test is finished.
With continued reference to fig. 5, when the test mode in step S301 is the cooling power test, the process of the temperature control system from the initial temperature set value Th to the first temperature value Tg and the process from the second temperature value Tf to the temperature set value Te are unstable, and are not suitable as the process of the stable temperature drop. Therefore, when the test mode in step S301 is the cooling power test, the time period during which the temperature control system decreases from the first temperature value Tg to the second temperature value Tf is selected as the valid time data, i.e. the difference between the second time t2 'and the first time t 1', which is denoted as the cooling time tr, where tr is t2 '-t 1'.
Further, the calculation formula of the cooling power Pc is:
Pc＝CρV(Tg-Tf)/tr；
wherein C is the specific heat of the fluid, ρ is the density of the fluid, and V is the volume of the mixed flow cavity 103.
In the process of testing the thermal power of a refrigerating or heating object, the test temperature range is set and the bypass valve 201 and the liquid return pipeline valve 202 are arranged, so that the test process has no influence on the object to be tested, and the test of a plurality of test items can be completed only by adding a corresponding test program in the controller 109.
When the test mode in step S301 is a continuous test of heating and cooling powers, the thermal power test apparatus can test both the heating power of the heater 102 and the cooling power of the refrigerator 101. Firstly, a continuous test mode of heating and cooling power in the controller 109 is started, the controller 109 controls the bypass valve 201 to be opened and the liquid return pipeline valve 202 to be closed so as to cut off the influence of the controlled object 108 on the heating test, and the initial temperature T0 is recorded; secondly, determining the temperature range of the fluid medium in the temperature control system, inputting an initial temperature set value T1 in the determined temperature range into a controller 109 in the temperature control system for temperature control, and simultaneously starting a timer 203 and a temperature sensor 104 to operate until the temperature control system is in a stable state; then the temperature set point in the controller 109 is changed to T4 so that the heater 102 operates at the maximum heating power, at which time the controller 109 issues a command to stop the operation of the refrigerator 101; the temperature of the fluid medium starts to rise, when the reading of the temperature sensor 104 rises to a first temperature value T2, the timer records a timing starting time ta, the temperature of the fluid medium continues to rise, and when the reading of the temperature sensor 104 rises to a second temperature value T3, the timer records a timing ending time tb; then, the temperature of the fluid medium continuously rises to a temperature set value T4, temperature control is carried out until the temperature of the temperature control system is stable, and the controller 109 sends an instruction to start the refrigerator 101; then, the temperature set value is changed to T1, so that the refrigerator 101 operates at the maximum cooling power, the heater 102 stops operating, the temperature of the fluid medium starts to decrease, when the reading of the temperature sensor 104 decreases to T3, the timer records the timing start time tc, the temperature of the fluid medium continues to decrease, when the reading of the temperature sensor 104 decreases to T2, the timer records the timing end time td, the temperature of the fluid medium continues to decrease to T1, the temperature set value is changed to the initial temperature T0, the temperature control system is kept in the original starting state, the temperature control is performed until the temperature control is stabilized, the controller 109 controls the bypass valve 201 to be closed, the liquid return pipeline valve 202 to be opened, and the continuous test of the heating and cooling powers is finished.
When the test mode in step S301 is a continuous test of heating and cooling power, the heating time th is tb-ta and the cooling time tr is td-tc. In the continuous test of the heating and cooling power, the heating power is recorded as Ph, and the cooling power is recorded as Pc, wherein,
Ph＝CρV(T3-T2)/(tb-ta)；
Pc＝CρV(T3-T2)/(td-tc)；
wherein C is the specific heat of the fluid, ρ is the density of the fluid, and V is the volume of the mixed flow cavity 103.
In order to better clarify a method for continuously testing heating and cooling power, the method is applied to a temperature control system with a temperature range of 17.5-27.5 ℃, wherein the heating power of a heater 102 is more than 2500 watts, the cooling power of a refrigerator 101 is more than 3500 watts, the flow output is 12-55 liters/minute, a temperature sensor 104 with a built-in platinum resistor of 100 ohms is used for measuring the temperature and a vortex flowmeter is used for measuring the flow, and a touch screen is configured as a man-machine interface 210.
The temperature T1 was set to 20 ℃, the temperature T2 was set to 21 ℃, the temperature T3 was set to 25 ℃, the temperature T4 was set to 26 ℃ in the controller 109, and the heating time th and the cooling time tr were respectively calculated by a clock inside the controller 109.
The specific test process is as follows: recording the initial temperature T0; inputting a given initial temperature set value into the controller 109, and controlling the temperature until the temperature is stabilized within the range of 20 +/-0.1 ℃ for 3 minutes; the temperature set point is changed to 26 deg.c so that the heater 102 operates at the maximum heating power and the refrigerator 101 stops operating; the water temperature starts to rise, when the reading of the temperature sensor 104 rises to 21 ℃, the heating timing starts, the temperature of the fluid medium continues to rise, when the reading of the temperature sensor 104 rises to 25 ℃, the heating timing is finished, and the time from the start to the end of the heating timing is 216 seconds calculated by a clock; thereafter, the water temperature continues to rise to 26 ℃ and temperature control is performed at 26 ℃ until it stabilizes within the range of 26. + -. 0.1 ℃ for 3 minutes, at which time the refrigerator 101 is started. The temperature set value is changed to 20 ℃, so that the refrigerator 101 operates at the maximum refrigerating power and the heater 102 stops operating; the water temperature begins to drop, when the reading of the temperature sensor 104 drops to 25 ℃, the refrigeration timing begins, the water temperature continues to drop, when the reading of the temperature sensor 104 drops to 21 ℃, the refrigeration timing ends, and the time from the beginning to the end of the refrigeration timing is 158 seconds through clock calculation; and the water temperature is continuously reduced to 20 ℃, the temperature set value is changed into T0, and temperature control is carried out until the temperature is stable and the continuous test of heating and refrigerating power is finished.
If the fluid medium is water, the specific heat C is 4.22kJ/(kg DEG C), the density is 103kg/m3, the volume V is 0.035m3, the heating power Ph and the cooling power Pc can be obtained by calculating the heating power according to the collected data, wherein,
Ph＝CρV(T3-T2)/th＝4.22*103*0.035*(25-21)/216＝2.7kW；
Pc＝CρV(T3-T2)/tr＝4.22*103*0.035*(25-21)/158＝3.7kW。
through judgment, the heating power and the cooling power can be deduced to meet the requirements.
The thermal power testing device can continuously test the heating power and the cooling power, so that the thermal power test of the invention is not limited to a single test of the heating power or the cooling power, and the test of the heating power and the cooling power of the temperature control system can be simultaneously completed through a continuous test process.
EXAMPLE III
The present invention can also perform a thermal power test on the controlled object, specifically refer to fig. 6, which is a flowchart of the testing method provided in the third embodiment of the present invention. As shown in fig. 6, the method for performing a thermal power test on a controlled object by using the thermal power testing apparatus shown in fig. 2 comprises the following steps:
step S601: starting a temperature control system, and controlling the opening of a bypass valve and the closing of a liquid return pipeline valve by the controller;
step S602: setting an initial temperature value in a controller according to the temperature range of a fluid medium in a temperature control system, controlling the temperature, and recording the reading deviation of a temperature sensor and a liquid return temperature sensor;
step S603: selecting and starting a thermal power test mode of a controlled object through a controller;
step S604: the controller controls the bypass valve to be closed and the liquid return pipeline valve to be opened;
step S605: recording the flow value of the flow sensor; setting an initial temperature value in a controller and controlling the temperature;
step S606: running the controlled object, recording the reading of the liquid return temperature sensor, and recording the average temperature rise value of the liquid return temperature sensor when the temperature is stable;
step S607: and calculating the thermal power of the controlled object according to the flow value, the reading deviation and the average temperature rise value.
In this embodiment, the thermal power test mode is a thermal power test of the controlled object, and therefore, the thermal power test apparatus of the present invention can test not only the heating power of the heater 102, the cooling power of the refrigerator 101, and the continuous tests of the heating and cooling powers, but also the thermal power of the controlled object, and respectively implement the thermal power tests of the main control object and the controlled object.
In the present embodiment, the reading deviation Tr of the temperature sensor 104 and the return liquid temperature sensor 204, the average temperature rise value Tu, and the flow rate value Q of the flow rate sensor are expressed as P1, wherein,
P1＝ηCρQ(Tu-Tr)；
wherein C is the specific heat of the fluid, rho is the density of the fluid, and eta is the heat exchange coefficient.
Fig. 7 is a graph showing the relationship between the set initial temperature and the temperature measured by the return liquid temperature sensor according to the third testing method of the embodiment. Referring to fig. 7, the relationship 701 of the initial temperature with time change, the relationship 702 of the temperature with time change, and the relationship 702 of the temperature with time change, which are input to the controlled object 108 in the temperature control system, are performed, and the temperature output by the controlled object 108 increases with time at the beginning stage and reaches a stable average temperature rise value after being stabilized for a certain period of time.
In summary, the thermal power testing device provided by the invention attaches the testing device to the existing temperature control system, so that the thermal power test of the refrigerating and heating object can be performed on-line test without adopting off-line test and developing special testing equipment, the testing device is simple, the occupied space is small, and most of testing components can be shared; the thermal power testing device can measure the heating power of a main control object such as a heater and the cooling power of a refrigerator, can continuously measure the heating power and the cooling power, and can measure the thermal power of a controlled object.
Hereinbefore, specific embodiments of the present invention are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present invention without departing from the spirit and scope of the invention. Such modifications and substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (13)
1. A thermal power testing device connected to a temperature control system, the temperature control system comprising: controller, temperature sensor, return liquid pipeline and send the liquid pipeline, the temperature signal that temperature sensor surveyed is carried to the controller, its characterized in that, thermal power testing arrangement includes:
the bypass valve is arranged between the liquid return pipeline and the liquid feeding pipeline and is connected with the controller;
the liquid return pipeline valve is arranged in the liquid return pipeline and is connected with the controller;
and the timer is arranged inside the controller.
2. The thermal power testing device of claim 1, further comprising a return fluid temperature sensor disposed in the return fluid conduit.
3. The thermal power testing device of claim 2, further comprising a return fluid temperature sensor cable, wherein the return fluid temperature sensor inputs the measured temperature of the medium in the return fluid conduit to the controller via the return fluid temperature sensor cable.
4. The thermal power testing device of claim 1, further comprising a flow sensor disposed in the fluid delivery conduit.
5. The thermal power testing device of claim 4, further comprising a flow sensor cable, wherein the flow sensor inputs the measured flow of the medium in the fluid delivery conduit to the controller via the flow sensor cable.
6. The thermal power test device of claim 1, further comprising a bypass valve cable, the bypass valve being connected to the controller by a bypass valve cable.
7. The thermal power testing device of claim 1, further comprising a fluid return conduit valve cable, the fluid return conduit valve being connected to the controller via the fluid return conduit valve cable.
8. The thermal power testing device according to claim 1, wherein the temperature control system further comprises a controlled object, and the liquid return pipeline and the liquid delivery pipeline are respectively connected to the controlled object.
9. A method for testing a thermal power testing apparatus, comprising:
selecting and starting a test mode through a controller;
the controller controls the bypass valve to be opened and the liquid return pipeline valve to be closed;
setting a first temperature value and a second temperature value in a controller according to the temperature range of a medium in a temperature control system;
when the temperature sensor reads a first temperature value, the timer records a first moment corresponding to the first temperature value;
when the temperature sensor reads a second temperature value, the timer records a second moment corresponding to the second temperature value;
the controller controls the bypass valve to be closed and the liquid return pipeline valve to be opened;
and calculating the thermal power value according to the first temperature value, the second temperature value and the difference value between the second moment and the first moment.
10. The method for testing a thermal power testing apparatus according to claim 9, wherein the test mode is a heating power test.
11. The method for testing a thermal power testing device according to claim 9, wherein the test mode is a cooling power test.
12. The method for testing a thermal power testing device according to claim 9, wherein the test mode is a continuous test of heating and cooling power.
13. A method for testing a thermal power testing apparatus, comprising:
starting a temperature control system, and controlling the opening of a bypass valve and the closing of a liquid return pipeline valve by the controller;
setting an initial temperature value in a controller according to the temperature range of a medium in a temperature control system, controlling the temperature, and recording the reading deviation of a temperature sensor and a liquid return temperature sensor;
selecting and starting a thermal power test mode of a controlled object through a controller;
the controller controls the bypass valve to be closed and the liquid return pipeline valve to be opened;
recording the flow value of the flow sensor;
setting an initial temperature value in a controller and controlling the temperature;
running the controlled object, recording the reading of the liquid return temperature sensor, and recording the average temperature rise value of the liquid return temperature sensor when the temperature is stable;
and calculating the thermal power of the controlled object according to the flow value, the reading deviation and the average temperature rise value.
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Application publication date: 20120718 |