JPH04359793A - Air conditioning system using tube heat exchanger - Google Patents

Abstract

PURPOSE:To make it possible to install an air conditioning system with a space advantage and maintain a satisfactory heat exchange performance in simple construction. CONSTITUTION:A fluid supply port which supplies a secondary fluid to one end of a first pipeline 8 in a longitudinal direction is connected with a fluid discharge port 2b which discharges the secondary fluid to the other end. Piping joint flanges 9 are installed to the both ends of the first piping line 8 in the longitudinal direction and caps 10 for closing the opening section is fitted. A large number of second small-sized tubes 11 are dispersedly installed so as to supply the elementary fluid between the caps on both the sides in such a way that they open in the outer surface of the caps 10. There is formed a flow passage which lets the secondary fluid to move from the fluid supply port 2a to the fluid discharge 2b between the adjacent tubes 11 in the first pipeline 8.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention utilizes the heat of the primary fluid flowing in vertical piping when performing air conditioning such as cooling or heating in buildings such as buildings using hot water or cold water as a heat source. The present invention relates to a piping-type heat exchanger used for transmitting a secondary fluid to a user-side heat exchanger such as an air conditioner installed on each floor, and an air conditioning system using the same.

0002

[Prior Art] When extracting heat from a vertical pipe through which a primary fluid flows, generally, a branch pipe for extracting the primary fluid is connected to a midway point of the vertical pipe, and the branch pipe and a heat exchanger are connected to each other. The primary side piping was connected in communication with the heat exchanger, and the secondary side piping of the heat exchanger was connected through the piping with a user side heat exchanger such as an air conditioner.

[0003] However, there are drawbacks in that branch piping is required in addition to the heat exchanger, and space is required to install the heat exchanger, resulting in increased costs.

[0004] In addition to the work of connecting pipes between the heat exchanger on the heat source side and the heat exchanger on the user side, there is also work to connect branch pipes to vertical pipes, and connection work between the branch pipes and the heat exchanger on the heat source side. This has the drawback that the pipe connection work is time-consuming, lengthening the construction period and increasing construction costs.

[0005] Conventionally, there has been a system disclosed in Japanese Utility Model Application Laid-Open No. 132320/1983 that makes it possible to eliminate the need for such branch piping.

According to this conventional example, first and second heat exchangers serving as the heat source are attached to the existing sanitary drain pipe and sanitary water supply pipe, respectively, and a heat exchanger serving as the user side is formed inside an aluminum sash. The refrigerant passage and the first and second heat exchangers are connected in series, and the inside is filled with a refrigerant that changes phase between liquid and gas, and the cold water passing through the sanitary drain pipe and the sanitary water supply pipe is utilized. The refrigerant liquid is condensed and liquefied, and the refrigerant liquid is sent to a refrigerant passage formed in the aluminum sash, where the evaporated refrigerant gas rises and returns to the first and second heat exchangers, performing air conditioning through natural circulation. It is configured.

[0007]

However, in the conventional example as described above, when the first and second heat exchangers are attached to a sanitary drain pipe or a sanitary water supply pipe, generally,
The casing that makes up the heat exchanger can be divided into two parts, and a sanitary drain pipe or sanitary water supply pipe is sandwiched between the divided casing parts, and in this state, it is tightened and fixed with bolts, etc.; The upper and lower semicircular end surfaces of the casing must be pressed against the outer peripheral surface of the sanitary drain pipe or sanitary water supply pipe to prevent vertical slippage and seal against the refrigerant while supporting the weight of the casing. The disadvantage was that the area of the pressure contact surface was small, making it difficult to achieve a sufficient seal.

[0008] Therefore, the present applicant et al. provided a flange to be connected to the flange of the piping through which the primary fluid flows, and a linear primary side that was connected removably in a straight line to a midway point of the piping. Heat transfer fins are attached to the outer circumferential surface of the pipe, and a casing that forms the secondary side pipe is provided on the primary pipe to surround the heat transfer fin, making it possible to eliminate the need for branch pipes and reduce the area of the pressure contact surface. A proposal was made to make the heat exchanger large enough to provide sufficient sealing and to reduce the space for installing the heat exchanger (Japanese Patent Application No. 1-332387), but the heat transfer area was made sufficiently large. There was room for improvement in terms of heat exchange performance.

The present invention has been made in view of the above circumstances, and the pipe type heat exchanger according to the invention of claim 1 can be provided advantageously in terms of space and has a simple structure. The purpose of the air conditioning system is to ensure sufficient heat exchange performance, and the air conditioning system according to the invention of claim 2 is constructed by reducing the effort required to assemble the heat exchanger on the heat source side. The purpose of the air conditioning system according to the invention of claim 3 is to further improve the workability when constructing a system for a multi-story building. The purpose is to enable improvement.

0010

[Means for Solving the Problems] In order to achieve the above-mentioned objects, the piping type heat exchanger of the invention according to claim 1 has the following features:
A fluid supply port for supplying secondary fluid is connected to one end in the longitudinal direction of the first pipe, and a fluid discharge port for discharging secondary fluid is connected to the other end; A flange for piping connection is provided at each end of the piping in the longitudinal direction, and a cap is attached to close the opening. Both ends are opened on the outer surface of the cap, and a flow path is formed between adjacent second pipes in the first pipe for flowing the secondary fluid from the fluid supply port to the fluid discharge port. It is configured by distributing it in different states.

[0011] In order to achieve the above object, the air conditioning system of the invention according to claim 2 uses the piping type heat exchanger according to the invention according to claim 1, and the first piping is used as a heat source. A flange is connected in a straight line to a vertical pipe through which fluid flows, and each of the fluid supply port and fluid discharge port is connected to the user-side heat exchanger via a refrigerant pipe,
The refrigerant is configured to naturally circulate and flow between the user-side heat exchanger and the first pipe due to a phase change between gas and liquid.

[0012] The air conditioning system of the invention according to claim 3 has the following features:
It is constructed by connecting a plurality of vertical pipes in the longitudinal direction.

[0013]

[Operation] According to the configuration of the piping type heat exchanger of the invention according to claim 1, the flange is connected to a desired point in the middle of the piping through which the primary side fluid flows, and the secondary side piping is connected to the fluid supply port and the fluid exhaust port. By connecting to each outlet, it is possible to take out the secondary fluid that has exchanged heat with the primary fluid.

According to the configuration of the air conditioning system of the invention according to claim 2, the first pipe is flange-connected to the vertical pipe, and the fluid supply port and the fluid discharge port respectively perform cooling or heating. By connecting the heat exchanger on the user side via the refrigerant piping, the secondary fluid that has exchanged heat with the heat source fluid, which is the primary fluid, is supplied to the heat exchanger on the user side, and the first piping Cooling or heating can be achieved by natural circulation of the refrigerant between the heat exchanger and the user-side heat exchanger.

According to the configuration of the air conditioning system of the invention according to claim 3, a plurality of first pipes are flange-connected to the vertical pipe, and the fluid supply port and the fluid discharge port of each first pipe are connected to the vertical pipe. By connecting each outlet to a user-side heat exchanger for cooling or heating installed on multiple floors via refrigerant piping, the secondary fluid that has exchanged heat with the heat source fluid that is the primary fluid. The side fluid is supplied to each of the user-side heat exchangers provided on multiple floors, and the refrigerant is naturally circulated across each of the first pipes and each of the user-side heat exchangers to perform cooling or heating.

[0016]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall system configuration diagram of an air conditioning system for cooling using a pipe-type heat exchanger according to the present invention.
FIG. 2 is an enlarged cross-sectional view of the main parts, and FIG. 3 is a cross-sectional view taken along the line A-A in FIG. The vertical pipe 1 is composed of a pipe-type heat exchanger 2 serving as a heat source and serving as a condenser, and length adjusting pipes 1a.

An individual air conditioner 5 equipped with a user-side heat exchanger 3 and a blower fan 4, which function as an evaporator, is installed in each room on each floor of a building.

The user side heat exchanger 3...the fluid discharge port 2b and the fluid supply port 2a of the piping type heat exchanger 2, respectively.
are connected to each other via refrigerant liquid piping 6 and refrigerant vapor piping 7, and extend to these piping type heat exchanger 2, refrigerant liquid piping 6, refrigerant vapor piping 7, and user-side heat exchanger 3,
A refrigerant whose phase changes from gas to liquid by heat exchange with cold water in the piping type heat exchanger 2 and from liquid to gas by heat exchange in the user-side heat exchanger 3 is filled in a sealed state, and , the pipe-type heat exchanger 2 is disposed at a predetermined level above the user-side heat exchanger 3, and the fluid supply port 2a is located above the fluid discharge port 2b, so that the pipe-type heat exchanger 2 A head difference sufficient to transfer the refrigerant liquid whose phase has changed from gas to liquid due to heat exchange to the user side heat exchanger 3 is provided between the user side heat exchanger 3 and the user side heat exchanger 3. The refrigerant is configured to naturally circulate and flow between the piping heat exchanger 2 and the user-side heat exchanger 3 due to the phase change with the liquid.

CFC gas R-22 is used as the refrigerant. This has the advantage that it contains hydrogen and chlorine and is decomposed in a convection field, so there is no risk of destroying the ozone layer.

[0021] The piping type heat exchanger 2...each is shown in FIG.
As clearly shown in the enlarged sectional view, a secondary fluid is provided at one end in the longitudinal direction of the first pipe 8, which has an inner diameter equal to that of the vertical pipe 1 and the length adjustment pipe 1a and has a length of 1 m or more. A fluid supply port 2a for supplying refrigerant vapor is connected thereto, and a fluid discharge port 2b for discharging a refrigerant liquid as a secondary fluid is connected to the other end.

Flanges 9 for connection to the vertical pipe 1 and the length adjustment pipe 1a are provided at both longitudinal ends of the first pipe 8, and caps 10 for closing the openings are attached. .

[0023] Across the caps 10, 10 on both sides,
A large number of small-diameter second pipes 11 that supply cold water as the primary fluid are opened at both ends in the longitudinal direction to the outer surfaces of the caps 10, 10, and adjacent second pipes 11 in the first pipe 8 are opened at both ends in the longitudinal direction. Piping 11... A flow path R through which the refrigerant flows from the fluid supply port 2a to the fluid discharge port 2b.
They are distributed and provided to form...

Although not shown, the outer peripheral surfaces of each of the length adjusting tube 1a and the piping type heat exchanger 2 are covered with a heat insulating material. An electromagnetic on-off valve 12 for blocking the inflow of the refrigerant liquid is provided at the entrance of the refrigerant liquid pipe 6 to each of the use-side heat exchangers 7 .

With the above configuration, the refrigerant vapor evaporated as a result of heat exchange in the user-side heat exchangers 3 rises and is supplied into the first pipe 8 from the fluid supply port 2a, and is mixed with cold water. The refrigerant liquid condensed and liquefied as a result of heat exchange flows down from the fluid discharge port 2b and is supplied to the user-side heat exchangers 3, thereby performing air conditioning through natural circulation of the refrigerant.

FIG. 4 is an overall system configuration diagram of an air-conditioning system for heating using the pipe-type heat exchanger according to the present invention, and 21 is a system diagram showing hot water as a heat source fluid supplied from the district heating and cooling system. This vertical pipe 21 is composed of a pipe-type heat exchanger 2 serving as a heat source and serving as an evaporator, and length adjusting pipes 21a.

A user-side heat exchanger 22 and a blower fan 23 that act as a condenser are installed in each room on each floor of the building.
An individual air conditioner 24 is provided.

The user-side heat exchanger 22...the fluid supply port 2a and the fluid discharge port 2 of each of the piping type heat exchanger 2
b are connected to each other via refrigerant liquid piping 25 and refrigerant vapor piping 26 as refrigerant piping, and these pipe-type heat exchanger 2, refrigerant liquid piping 25, refrigerant vapor piping 26, and user-side heat exchanger 22 The refrigerant is filled in a sealed state, which changes its phase from liquid to gas by heat exchange with hot water in the piping heat exchanger 2, and changes its phase from gas to liquid by heat exchange in the user-side heat exchanger 22. , and the pipe-type heat exchanger 2 is arranged below the user-side heat exchanger 22..., and the fluid supply port 2a is located below the fluid discharge port 2b, and the pipe-type heat exchanger 2 A head difference sufficient to transfer the refrigerant liquid whose phase has changed from gas to liquid due to heat exchange to the piping type heat exchanger 2 is provided between the heat exchanger 22 and the user side heat exchanger 22. The refrigerant is configured to naturally circulate and flow between the piping heat exchanger 2 and the user-side heat exchanger 22 due to the phase change with the liquid. In this case, in the piping type heat exchanger 2, refrigerant liquid is supplied from its fluid supply port 2a, and refrigerant vapor is discharged from its fluid discharge port 2b.

With the above configuration, the user side heat exchanger 22...
The refrigerant liquid condensed and liquefied as a result of heat exchange with the hot water flows down and is supplied into the first pipe 8 (omitted in FIG. 4) from the fluid supply port 2a, and the refrigerant evaporates as the heat exchanges with the hot water. The steam is raised from the fluid discharge port 2b to the utilization side heat exchanger 22...
The system is designed to provide heating through natural circulation of the refrigerant.

[0030] In the above specific example, the case of cooling and heating was explained, but it can be applied to various types of heat exchange. Also,
In the above specific example, the piping type heat exchanger 2 and the user side heat exchanger 3
. . , 22 . . . Although the refrigerant is configured to naturally circulate and flow through each of them, it is also possible to forcibly circulate and flow a refrigerant solution such as water using a pump.

[0031] The second piping 11... heat transfer fins may be attached to the outer peripheral surface of each of them at predetermined intervals in the longitudinal direction. The first pipe 8 may have a length of about 2.5 to 3.0 m, which is close to the height of one floor of a building.

[0032]

[Effects of the Invention] According to the piping type heat exchanger of the invention according to claim 1, the heat exchanger can be provided in a state where the flanges are facing each other and are connected with sufficient sealing performance, forming a part of the piping. This simplifies the pipe connection work, eliminates the need for a dedicated space for installing a heat exchanger, and is advantageous in terms of design. Connect the piping with a flange, and connect the first
Because the primary fluid flows through a large number of small-diameter pipes installed within the piping, it is much more efficient than a configuration in which fins or casings are provided outside the piping that is flanged to the piping that carries the primary fluid and the secondary fluid flows. Can be made compact.

Furthermore, even though a large number of small-diameter pipes are simply provided across the caps on both sides, the heat transfer area between the primary fluid and the secondary fluid can be made sufficiently large, and sufficient heat exchange performance can be ensured with a simple configuration. .

According to the air conditioning system of the invention according to claim 2, the heat exchanger serving as the heat source side can be assembled by simply connecting the first pipe to the vertical pipe with a flange. It has become possible to construct an air conditioning system with the same piping connection work as connecting unit length piping, and it has become possible to improve the workability.

According to the air conditioning system of the invention according to claim 3, when constructing a system for a multi-story building, the piping connection work can be performed more easily and quickly, and the workability is further improved. Now you can.

[Brief explanation of drawings]

FIG. 1 is an overall system configuration diagram of an air conditioning system for cooling using a pipe-type heat exchanger.

FIG. 2 is an enlarged sectional view of main parts.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is an overall system configuration diagram of a heating air conditioning system using a pipe-type heat exchanger.

[Explanation of symbols]

1... Vertical piping 2a...Fluid supply port 2b...Fluid outlet part 3...User side heat exchanger 6...Refrigerant liquid piping as refrigerant piping 7...Refrigerant vapor piping as refrigerant piping 8...First piping 9...Flange 10...Cap 11...Second piping 21...Vertical piping 22...User side heat exchanger 25...Refrigerant liquid piping as refrigerant piping 26...Refrigerant vapor piping as refrigerant piping R...Flow path

Claims (3)

[Claims] Claim 1: A fluid supply port for supplying secondary fluid is connected to one end in the longitudinal direction of the first pipe, and a fluid discharge port for discharging secondary fluid is connected to the other end. , and a flange for pipe connection is provided at each longitudinal end of the first pipe, and a cap for closing the opening is attached, and a large number of small-diameter second pipes are provided over the caps on both sides to supply the primary fluid. A pipe is opened at each of its longitudinal ends on the outer surface of the cap, and a secondary pipe is connected from the fluid supply port to the fluid discharge port between adjacent second pipes in the first pipe. A piping-type heat exchanger characterized in that the pipe-type heat exchanger is disposed in a distributed manner to form a flow path through which a side fluid flows. 2. The first pipe according to claim 1 is connected by a straight flange to a vertical pipe through which a heat source fluid flows, and
The fluid supply port and the fluid discharge port are connected to a user-side heat exchanger via a refrigerant pipe, and a phase change between gas and liquid is caused between the user-side heat exchanger and the first pipe. An air conditioning system in which refrigerant flows through natural circulation. 3. An air conditioning system, wherein a plurality of the first pipes according to claim 2 are connected in a longitudinal direction of the vertical pipe.