KR20080105609A - Air conditioning system for communication equipment and controlling method thereof - Google Patents

Abstract

An air conditioning system for a communication equipment and a controlling method thereof are provided to maintain an air conditioning state of a communication device even though the measurement of temperature is impossible due to that one of an indoor temperature sensor, an outdoor temperature sensor and a coolant temperature sensor is broke down. An air conditioning system for a communication equipment comprises: an indoor heat exchanger which is installed at an inlet and an outlet; a circulation pipe(130) through which coolant circulates; a circulation pump(132) which is installed at the circulation pipe; an outdoor heat exchanger(600) which is installed at the circulation pipe placed at the outdoor; a bypass pipe which cools down coolants without using the heat exchanger; a first cooling unit(100) which is consists of a first brine heat exchanger rounding a first tube for heat exchange; a compressor(210) which transforms the coolants to high temperature/pressure vapor; a condenser(220) which implements the heat exchange for the coolants, which pass the compressor, and outdoor air; an expansion valve(230); an evaporator(240) which exchanges heat with the first tube for heat exchange; and a second cooling unit(200).

Description

Air conditioner for communication equipment and its control method {AIR CONDITIONING SYSTEM FOR COMMUNICATION EQUIPMENT AND CONTROLLING METHOD THEREOF}

1 is a schematic view showing a cooling device for a communication device according to the present invention.

2 is a view showing a cooling process using the first cooling means of the present invention.

3 is a view showing a cooling process using the first and second cooling means of the present invention.

4 is a view showing a cooling process using the first to third cooling means of the present invention.

5 to 7 is a flow chart illustrating a control method of a cooling device for communication equipment according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: first cooling means 110: indoor heat exchanger

112, 114: temperature sensor 120: outdoor heat exchanger

130: circulation piping 140: bypass piping

152, 154: bypass valve 162, 164: heat exchange tube

172, 174: brine heat exchanger 180: heating wire

190: refrigerant temperature sensor 200, 300: second and third cooling means

210, 310: compressor 220, 320: condenser

230, 330: expansion valve 240, 340: evaporator

400: base station 500: indoor unit

600: outdoor unit

The present invention relates to a cooling device for a communication device and a control method thereof. Specifically, the cooling state of the communication device is measured even when an abnormality occurs in any one of the indoor temperature sensor, the outdoor temperature sensor, and the refrigerant temperature sensor. It relates to a cooling apparatus that can be stably maintained and a control method thereof.

A general air conditioner uses evaporative heat to take heat away from the surroundings when the refrigerant evaporates. As a refrigerant, a liquid such as ammonia, freon, azeotropic mixed refrigerant, chloromethyl, etc., which is easily evaporated even at low temperatures is generally used.

Such a conventional cooling device is a low-pressure sprayed refrigerant through expansion valves or capillaries after condensed into a high-pressure liquid refrigerant by heat exchange with the outside air while the refrigerant of the high-pressure compressed gas in the compressor passes through the condenser Is converted. The low pressure spray refrigerant is introduced into the evaporator, evaporated by heat exchange with the bet, and then flowed back into the compressor to circulate the cycle of the above-described process. It is blown to a predetermined space or object to be cooled by.

That is, such a general cooling device cools a predetermined space or object to be cooled by using a refrigerant which is easy to change phase such as liquefaction and evaporation. In particular, in the case of a communication base station or a communication vehicle, a plurality of wired and wireless communication equipments are installed therein, and these communication equipments can cause various malfunctions such as poor contact and equipment failure by frequent heat generation, thereby cooling four seasons all year round. Only in order to ensure the stability of the operation.

However, the conventional cooling device for communication equipment does not properly use the cool air of the natural state according to the external temperature, there is a drawback of a severe power waste by simply adopting a method driven by external power.

The present applicant has developed and applied a cooling device for a communication device and a control method (application number: 10-2005-0014790) that can cool the communication equipment by using the outside air to improve this problem. However, in the case of an earlier application, when an abnormality occurs in a sensor for measuring indoor and outdoor temperatures, the cooling device is stopped or continuously operated so that the cooling state of the communication equipment cannot be stably maintained.

Therefore, the present invention is to solve the above-mentioned problems, the cooling of the communication equipment can be stably maintained even if the temperature measurement is impossible because any one of the indoor temperature sensor, the outdoor temperature sensor and the refrigerant temperature sensor It is an object of the present invention to provide an apparatus and a control method thereof.

The present invention for achieving the object as described above relates to a device for cooling the communication equipment installed in the base station comprises a first cooling means, a second cooling means and a third cooling means.

The first cooling means may include an indoor and outdoor heat exchanger that exchanges heat with indoor and outdoor air of a base station, a circulation pipe for circulating refrigerant by connecting an indoor and outdoor heat exchanger, a circulation pump installed on the circulation pipe, and an outdoor space. The heating wire and the refrigerant temperature sensor provided in the heat exchanger side circulation pipe, the bypass pipe for circulating the refrigerant without passing through the outdoor heat exchanger, the bypass valves provided in the circulation pipe and the bypass pipe, respectively, A first heat exchange tube, a first brine heat exchanger surrounding the first heat exchange tube, and an indoor and outdoor temperature sensor for measuring indoor and outdoor temperatures of the base station.

In addition, the second cooling means includes a compressor for converting a refrigerant into a gas of high temperature / high pressure, a condenser in which heat exchange is performed between the refrigerant passing through the compressor and outdoor air, and a refrigerant introduced from the condenser into a liquid of low temperature / low pressure. And an evaporator provided between the expansion valve and the compressor and positioned in the first brine heat exchanger to exchange heat with the first heat exchange tube.

In addition, the third cooling means includes a compressor for converting a refrigerant into a gas of high temperature / high pressure, a condenser in which heat exchange is performed between the refrigerant passing through the compressor and outdoor air, and a refrigerant flowing from the condenser into a liquid of low temperature / low pressure. The evaporator is provided between the expansion valve, the expansion valve and the compressor and positioned in the second brine heat exchanger to exchange heat with the second heat exchange tube.

On the other hand, the control method of the cooling device for communication equipment according to the present invention, the first step of determining whether or not the indoor temperature sensor failure, the first to third cooling means individually or according to the outdoor temperature when the indoor temperature sensor failure; A second step of operating in combination; a third step of determining whether the outdoor temperature sensor is broken; and a fourth step of operating individually or in combination with the first to third cooling means according to the indoor temperature when the outdoor temperature sensor fails. And a fifth step of determining whether or not the refrigerant temperature sensor is broken, and a sixth step of individually or combining the first to third cooling means according to the room temperature when the refrigerant temperature sensor is broken.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram schematically showing a cooling device for communication equipment according to the present invention.

As shown in FIG. 1, a cooling device for communication equipment according to the present invention includes a first cooling means 100 for directly cooling communication equipment (not shown), and a refrigerant charged in the first cooling means 100. It comprises a second cooling means 200 and the third cooling means 300 to indirectly cool by lowering the temperature of the. In this case, the first to third cooling means (100, 200, 300) is provided in the indoor unit 500 installed in the base station 400 and the outdoor unit 600 installed outside the base station 300 together with the communication equipment. . In addition, the indoor unit 500 and the outdoor unit 600 are provided with an indoor temperature sensor 510 and an outdoor temperature sensor 610 for measuring the indoor temperature and the outdoor temperature, respectively.

The first cooling means 100 of the first to third cooling means described above will be described first.

The indoor heat exchanger 110 provided inside the indoor unit 500 is a portion in which heat exchange is performed between the refrigerant and the indoor air, and first and second temperature sensors 112 and 114 are provided at the inlet and the outlet sides, respectively. One side thereof is provided with an indoor blower 116 for sending heat-exchanged air into the room. In addition, the outdoor heat exchanger 120 provided inside the outdoor unit 600 is a portion in which heat exchange is performed between the refrigerant and the outdoor air, and is provided at both sides of the outdoor blower 122 for discharging the heat-exchanged air to the outside. Each is installed but connected in series (or in parallel). The indoor heat exchanger 110 and the outdoor heat exchanger 120 are connected by the circulation pipe 130 and filled with a predetermined refrigerant therein.

The circulation pipe 130 is a portion in which the refrigerant is filled and circulated as described above, and the circulation pump 132 and the circulation pipe 130 for forcibly circulating the refrigerant on the circulation pipe 130 A pressure switch 134 and a flow rate switch 136 for measuring pressure and flow rate are provided. In addition, the outdoor heat exchanger 600 side circulation pipe 130 is provided with a heating wire 180 for preventing the freezing of the cooling device, and a refrigerant temperature sensor 190 for measuring the temperature of the refrigerant. In addition, on the circulation pipe 130, the first and second heat exchange tubes 162 and 164, which are heat-exchanged with the evaporators 240 and 340 of the second and third cooling means 200 and 300, which will be described later, are in series. The first and second brine heat exchangers 172 and 174 are provided to surround the first and second heat exchange tubes 162 and 164, respectively. On the other hand, the bypass pipe 140 is connected to the circulation pipe 130 so that the refrigerant can be circulated without passing through the outdoor heat exchanger 120, the circulation pipe 130 and the bypass pipe 140 to select them Alternatively, first and second bypass valves 152 and 154 for simultaneously opening and closing are provided.

The second cooling means 200 includes a compressor 210 for converting a refrigerant into a gas of high temperature / high pressure, a condenser 220 through which heat exchange is performed between the refrigerant passing through the compressor 210 and outdoor air, and the An expansion valve 230 for converting the refrigerant introduced from the condenser 220 into a liquid of low temperature / low pressure, and is provided between the expansion valve 230 and the compressor 210 and positioned in the first brine heat exchanger 172. The first heat exchange tube 162 and the evaporator 240 is a heat exchange is made.

In addition, the third cooling means 300 is the same configuration as the second cooling means 200, the compressor 310 for converting the refrigerant into a gas of high temperature / high pressure, and the refrigerant passing through the compressor 310 and the outdoor Between the condenser 320 and heat exchange between the air, the expansion valve 330 for converting the refrigerant introduced from the condenser 320 into a liquid of low temperature / low pressure, and between the expansion valve 330 and the compressor 310 And an evaporator 340 disposed in the second brine heat exchanger 174 to exchange heat with the second heat exchange tube 164.

Here, the first cooling means 100 of the cooling device for communication equipment according to the present invention uses water as a refrigerant, and the second and third cooling means 200 and 300 are freon, ammonia, chloromethyl and azeotropic mixed refrigerants. Is used as the refrigerant.

Looking at the cooling process of the communication equipment using the cooling device for communication equipment according to the present invention having the configuration as described above are as follows. At this time, the cooling mode of the communication equipment using the cooling device for communication equipment according to the present invention is determined by the room temperature, the outdoor heat exchanger 120 is operated or stopped according to the outdoor temperature and the refrigerant (also referred to as brine) temperature.

First, the indoor temperature of the base station 400 is measured, and if the measured indoor temperature is equal to or greater than the first reference temperature (for example, 25 ° C.), the first cooling means 100 is operated to perform primary cooling (see FIG. 2). ). At this time, when the outdoor temperature is lower than the refrigerant temperature, the first bypass valve 152 is opened and the outdoor heat exchanger 120 is operated (the second bypass valve 154 is closed). On the other hand, when the outdoor temperature is higher than the refrigerant temperature, the second bypass valve 154 is opened and the operation of the outdoor heat exchanger 120 is stopped (the first bypass valve 152 is closed).

In addition, when the measured indoor temperature is higher than the second reference temperature (for example, 26.5 ° C.) and the cooling in the base station is not sufficient by only the first cooling, the first cooling means 100 and the second cooling means 200 are operated together. Secondary cooling is performed (see FIG. 3). As described above, when the first and second cooling means 100 and 200 are operated together, the first refrigerant (the refrigerant of the first cooling means) and the second refrigerant (the refrigerant of the second cooling means) in the first brine heat exchanger 172. The heat exchange is performed between), and is cooled by using the cooled first refrigerant.

In addition, when the measured indoor temperature is higher than the third reference temperature (for example, 27.5 ° C.) and the cooling in the base station is not sufficient even by the second cooling, the first cooling means 100, the second cooling means 200, and the third cooling means. By operating all the cooling means 300 to perform the third cooling (see Fig. 4). As such, when all of the first to third cooling means 100, 200, and 300 operate, heat exchange is performed between the first refrigerant and the second refrigerant in the first brine heat exchanger 162, and the second brine heat exchanger. In 174, heat exchange is performed between the first refrigerant and the third refrigerant (the refrigerant of the third cooling means), and the air is cooled by using the cooled first refrigerant.

Here, even when the outdoor temperature is lower than the refrigerant temperature during the secondary and tertiary cooling as described above, the first bypass valve 152 is opened and the outdoor heat exchanger 120 is operated. The bypass valve 154 is opened and the operation of the outdoor heat exchanger 120 is stopped.

On the other hand, with reference to Figures 1, 5 to 7, the control method when a failure occurs in the various temperature sensors, that is, the indoor temperature sensor, the outdoor temperature sensor and the refrigerant temperature sensor during cooling using the cooling device for communication equipment according to the present invention Let's take a look.

As shown in FIG. 5, it is determined whether the indoor temperature sensor 510, the outdoor temperature sensor 610, and the refrigerant temperature sensor 190 have a failure (102), and the failure of the indoor temperature sensor 510 is checked. In operation S104, the outdoor temperature T _out measured by the outdoor temperature sensor 610 is compared with the preset set temperatures T _e1 and T _e2 (S106, S110, and S114). At this time, when the outdoor temperature T _out is equal to or less than the first set temperature _Te1 , for example, 10 ° C., only the first cooling means 100 is operated (S108), and the first set temperature _Te1 exceeds the first temperature. If the set temperature (T _e2 , for example, 17 ° C.) or less is lower, the first and second cooling means 100 and 200, or the first and third cooling means 100 and 300 are operated (S112). When the outdoor temperature T _out exceeds the second set temperature T _e2 , the first to third cooling means 100, 200, and 300 are all operated to cool. Here, in the state where only the first cooling means 100 is operated, only the first bypass valve 152 is opened, and the first and second cooling means 100 and 200, or the first and third cooling means 100 and 300. ) Or only the second bypass valve 154 is opened while the first to third cooling means 100, 200, and 300 are operated.

On the other hand, as shown in Figure 6, it is determined whether the indoor temperature sensor 510, the outdoor temperature sensor 610 and the refrigerant temperature sensor 190 failure (102), the failure of the outdoor temperature sensor 610 is confirmed In operation S118, the indoor temperature T _in measured by the indoor temperature sensor 510 is compared with the cooling reference temperature, that is, the reference temperatures T s ₁ , T s ₂ , and T _{s 3} (S120, S124, and S128). At this time, when the indoor temperature T _in exceeds the first reference temperature T _s1 (for example, 25 ° C.) and is less than or equal to the second reference temperature (T _s2 , for example 26.5 ° C.), only the first cooling means 100 is operated. (S122), if the second reference temperature (T _e2 , 26.5 ° C.) is exceeded and less than or equal to the third reference temperature (T _e 3, for example 27.5 ° C.), the first and second cooling means (100, 200), or the first and The third cooling means (100, 300) is operated (S126). When the room temperature T _in exceeds the third reference temperature T _s3 , 27.5 ° C., all of the first to third cooling means 100, 200, and 300 are operated and cooled (S130). Wherein the indoor temperature (T _in ) exceeds the first reference temperature (T _s1 , 25 ℃) and less than the second reference temperature (T _s2 , 26.5 ℃) to operate the first cooling means 100, but the second bypass Since the valve 154 is opened, actual cooling is not achieved.

On the other hand, as shown in Figure 7, the indoor temperature sensor 510, the outdoor temperature sensor 610 and the refrigerant temperature sensor 190 determines whether the failure (102), the failure of the refrigerant temperature sensor 190 If it is confirmed (S132) the same as when the outdoor temperature sensor 610 is broken, the indoor temperature (T _in ) measured by the indoor temperature sensor 510, the cooling reference temperature, that is, the reference temperature (T _s1 , T _s2 , T _s3 ) (S134, S138, S142). At this time, if the room temperature T _in exceeds the first reference temperature (T _s1 , 25 ° C.) and is less than or equal to the second reference temperature (T _s2 , 26.5 ° C.), only the first cooling means 100 is operated (S136). If the second reference temperature (T _s2 ) and the third reference temperature (T _s3 , 27.5 ° C.) or less, the first and second cooling means (100, 200), or the first and third cooling means (100, 300) Operate (S140). When the room temperature T _in exceeds the third reference temperature T _s3 , the first to third cooling means 100, 200, and 300 are all operated and cooled (S144). Here too, if the room temperature T _in exceeds the first reference temperature (T _s1 , 25 ° C.) and is below the second reference temperature (T _s2 , 26.5 ° C.), the first cooling means 100 is operated, but the second bypass is performed. Since the valve 154 is opened, actual cooling is not achieved.

In case of failure of the outdoor temperature sensor 610 and the refrigerant temperature sensor 190 in the control process, the outdoor heat exchanger (1) is closed and the second bypass 154 is opened. 120) must be stopped. This is to prevent the inflow of outdoor air of high temperature or low temperature due to failure of the outdoor temperature sensor 610 and the refrigerant temperature sensor 190.

As described above, the configuration and control method of a cooling device for a communication device according to a preferred embodiment of the present invention has been shown in accordance with the above description and drawings, but this is merely described for example and does not depart from the technical spirit of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the present invention.

As described above, the cooling device for a communication device and the control method thereof according to the present invention are stable in the cooling state of the communication device even when the temperature measurement is impossible due to an abnormality in any one of the indoor temperature sensor, the outdoor temperature sensor, and the refrigerant temperature sensor. Can be maintained. In particular, the indoor temperature sensor and the outdoor temperature sensor is very useful because the cooling state of the communication equipment can be stably maintained even if two or more sensors except them are abnormal.

Claims (7)

In the apparatus for cooling the communication equipment installed in the base station, Indoor and outdoor heat exchangers, each of which exchanges heat with indoor and outdoor air of the base station, a circulation pipe for circulating refrigerant by connecting indoor and outdoor heat exchangers, a circulation pump installed on the circulation pipe, and an outdoor heat exchanger side circulation pipe. A refrigerant temperature sensor, a bypass pipe for circulating the refrigerant without passing through an outdoor heat exchanger, a bypass valve installed in the circulation pipe and the bypass pipe, a first heat exchange tube provided in the circulation pipe, and a first heat exchanger. First cooling means including a first brine heat exchanger surrounding the tube for air, an indoor and an outdoor temperature sensor for measuring indoor and outdoor temperatures of the base station, and A compressor for converting the refrigerant into a gas of high temperature / high pressure, a condenser for exchanging heat between the refrigerant passing through the compressor and outdoor air, an expansion valve for converting the refrigerant flowing from the condenser into a liquid of low temperature / low pressure, an expansion valve, Second cooling means provided between the compressor and positioned in the first brine heat exchanger, the second cooling means including an evaporator for exchanging heat with the first heat exchange tube; Cooling device for communication equipment, characterized in that consisting of. The method of claim 1, A compressor for converting the refrigerant into a gas of high temperature / high pressure, a condenser for exchanging heat between the refrigerant passing through the compressor and outdoor air, an expansion valve for converting the refrigerant introduced from the condenser into a low temperature / low pressure liquid, and an expansion valve. And third cooling means comprising an evaporator provided between the compressors, The first cooling means further comprises a second heat exchange tube provided on an outlet side of the first heat exchange tube, and a second brine heat exchanger surrounding the evaporator of the second heat exchange tube and the second cooling means. Air conditioner for communication equipment. The method of claim 2, Cooling device for communication equipment, characterized in that the refrigerant of the first cooling means is water. In the control method of the cooling device for communication equipment according to claim 3, Determining whether there is a failure of the indoor temperature sensor, operating the first to third cooling means individually or in combination according to the outdoor temperature when the indoor temperature sensor fails, and determining whether there is a failure of the outdoor temperature sensor; And operating the first to third cooling means individually or in combination according to the indoor temperature when the outdoor temperature sensor breaks down, determining whether the refrigerant temperature sensor is broken, and according to the indoor temperature when the refrigerant temperature sensor fails. Control method of a cooling device for communication equipment comprising the steps of operating the first to third cooling means individually or in combination. The method of claim 4, wherein In case of failure of the indoor temperature sensor, operating only the first cooling means when the outdoor temperature is less than or equal to the first set temperature, and the first and second cooling means when the outdoor temperature is above the first set temperature and less than the second set temperature. Or operating the first and third cooling means, and operating all of the first to third cooling means when the outdoor temperature exceeds the second set temperature. Control method. The method of claim 4, wherein In case of failure of the outdoor temperature sensor, only the first cooling means is operated when the indoor temperature exceeds the first reference temperature and is lower than the second reference temperature, and when the indoor temperature exceeds the second and below the third set temperature, Operating the first and second cooling means, or the first and third cooling means, and operating all of the first to third cooling means when the room temperature exceeds the third set temperature. Control method of air conditioner for communication equipment. The method of claim 4, wherein In case of failure of the refrigerant temperature sensor, operating only the first cooling means when the room temperature exceeds the first reference temperature and is below the second reference temperature; Operating the first and second cooling means, or the first and third cooling means, and operating all of the first to third cooling means when the room temperature exceeds the third set temperature. Control method of air conditioner for communication equipment.

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