JP3670731B2 - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently raise heating efficiency even in the case of low outdoor temperature (in a cold climate area) and enable demonstration of performance utilizing waste heat. SOLUTION: This air conditioning system comprises a water cooled condensing unit 200 for a showcase 210 and the like, a water source unit 300 for an air conditioner and a cooling tower 100 which are connected to each other by pipe lines so as to allow cooling water from the cooling tower 100 to circulate to the water cooled condensing unit 100 and/or the water source unit 300. A pipe line 24 is connected to a boiler 400, and hot water heated by the boiler 400 and/or hot water heated by the water cooled condensing unit 200 is used in heating operation as hot water circulated to the water source unit 300 of the air conditioner.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioning system including a showcase, an air conditioner, and a cooling tower, for example.
[0002]
[Prior art]
Generally, a water-cooled condensing unit such as a showcase, a water heat source unit of an air conditioner having a plurality of indoor units, and a cooling tower are connected by a pipe, and the cooling water from the cooling tower is supplied to the water-cooled condensing unit. There are known air conditioning systems that can be circulated to the cooling unit and / or the water heat source unit.
[0003]
This type has an advantage that air conditioning can be performed by an air conditioner using waste heat in a water-cooled condensing unit such as a showcase (see, for example, Japanese Patent Publication No. Sho 54-28022).
[0004]
[Problems to be solved by the invention]
However, according to the conventional configuration, air conditioning using waste heat in the water-cooled condensing unit can be performed, but sufficient heating efficiency cannot be increased when the outside air temperature is low (cold region). There is a problem.
In order to solve this, it is conceivable to provide a boiler so that hot water can be circulated to the water heat source unit when the outside air temperature is low.
[0005]
However, in an air conditioner having a plurality of indoor units, the number of indoor units operated is increased or decreased according to the heating load, so the boiler is operated until the number of operating units decreases or the heating load decreases. In other words, there is a problem that fuel is wasted and the air conditioning system using waste heat does not function effectively.
[0006]
Accordingly, an object of the present invention is to provide an air-conditioning system that can increase sufficient heating efficiency even when the outside air temperature is low (cold region) and that can fully exhibit the function of using waste heat. There is.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 includes a water-cooled condensing unit such as a showcase, a water heat source unit of an air conditioner, and a cooling tower connected by a pipe. In the air conditioning system in which the cooling water can be circulated to the water cooling type condensing unit and / or the water heat source unit, a boiler is connected to the pipeline, and the water heat source unit of the air conditioner is connected to the air conditioner during heating operation. Circulates hot water heated by the boiler and hot water heated by the water-cooled condensing unit when the heating load is large, while stopping the boiler operation when the heating load is small Only hot water heated by the water-cooled condensing unit is circulated.
[0009]
According to the first aspect of the present invention, when the heating load becomes large by providing the boiler in the pipeline, the shortage of the heating capacity as the whole system can be solved by operating the boiler. . Therefore, it becomes a system for so-called cold districts. When the heating load becomes small, the operation of the boiler can be stopped and switched to the operation using only the waste heat of the condenser, so that the efficiency of the heating operation can be improved. Furthermore, since the system uses the waste heat of the condenser, the capacity of the boiler can be designed to be smaller than when only the boiler is used.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
In FIG. 1, 100 indicates a cooling tower, 200 indicates a water-cooled condensing unit of the showcase 210, and 300 indicates a water heat source unit of an air conditioner having a plurality of indoor units 310. The cooling tower 100, the water-cooled condensing unit 200, and the water heat source unit 300 are connected by a pipe line.
[0011]
Explaining the piping system, the pipe line 11 led out from the cooling tower 100 is connected to a pump P through temperature sensors T 3 and T 4, and the pipe line 12 from the pump P is connected to the condenser 201 of the water-cooled condensing unit 200. Connected. The pipe 13 from the condenser 201 is connected to the port A of the three-way valve V4, and the port C of the three-way valve V4 is connected to the pipe 14 connected to the cooling tower 100, bypassing the water heat source unit 300 described later. A pipe line 15 is connected to the port B of the three-way valve V4, and this pipe line 15 is connected to the port B of the three-way valve V3.
[0012]
The port C of the three-way valve V3 is connected to the port B of the three-way valve V2 via the temperature sensor T2, and the heat exchanger 301 of the water heat source unit 300 is connected to the port C of the three-way valve V2 through the pipe line 16. The The heat exchanger 301 is connected to a pipe line 17, the pipe line 17 is connected to the above-described pipe line 14, and these pipe lines 14 and 17 are connected to a port A of the three-way valve V <b> 1 through a temperature sensor T <b> 1. . The port C of the three-way valve V1 is connected to the cooling tower 100 via a pipe line 18.
[0013]
More specifically, the port B of the three-way valve V1 is connected to the pipe line 11 via the pipe line 21, the port A of the three-way valve V2 is connected to the pipe line 12 via the pipe line 22, and the port A of the three-way valve V3. Is connected to the boiler 400 via the conduit 23, and the boiler 400 is connected to the conduit 12 via the conduit 24.
[0014]
The condenser 201 of the water-cooled condensing unit 200 is connected to a compressor 202, a showcase evaporator 211, and a decompression means 203 via a refrigerant pipe, and these constitute a refrigeration cycle. In addition, the heat exchanger 301 of the water heat source unit 300 constitutes an outdoor heat exchanger, and is connected to the compressor 302, the four-way valve 303, the decompression means 304, and the heat exchanger 311 of the indoor unit 310 via a refrigerant pipe. In addition, the plurality of indoor units 310 can be controlled individually.
[0015]
Next, the operation will be described.
Since the showcase 210 is used for freezing and refrigeration throughout the year, cold water from the cooling tower 100 is always supplied to the condenser 201 of the water-cooled condensing unit 200 connected to the showcase 210 regardless of summer or winter. The
[0016]
In the summer, as shown in FIG. 1, the ports A and C of the three-way valve V4, the ports A and C of the three-way valve V2, and the ports A and C of the three-way valve V1 are connected.
The cold water from the cooling tower 100 flows into the condenser 201 of the water-cooled condensing unit 200 through the pipe 11, the pump P, and the pipe 12 as indicated by solid arrows, and after heat exchange there, the pipe 13 The three-way valve V4 is returned to the cooling tower 100 through the ports A and C, the pipeline 14, the ports A and C of the three-way valve V1, and the pipeline 18. At the same time, the cold water from the cooling tower 100 flows into the heat exchanger 301 of the water heat source unit 300 through the pipe 22 and the ports A and C of the three-way valve V2, and after heat exchange there, the pipe 17 and the three-way valve It is returned to the cooling tower 100 through ports A and C of V1. In FIG. 1, reference numeral 70 indicates a fan.
[0017]
According to this, since the cold water from the cooling tower 100 is supplied in parallel to the condenser 201 of the water-cooled condensing unit 200 and the heat exchanger 301 of the water heat source unit 300, operation efficiency is improved.
[0018]
In winter, the flow of hot water is controlled according to the heating load.
When the heating load is large, the ports A and B of the three-way valve V4, the ports A, B and C of the three-way valve V3, the ports B and C of the three-way valve V2, and the ports A and C of the three-way valve V1 are connected. . The cold water from the cooling tower 100 flows into the condenser 201 of the water-cooled condensing unit 200 through the pipe 11, the pump P, and the pipe 12, as indicated by solid arrows in FIG. The pipe 13, the ports A and B of the three-way valve V 4, and the pipe 15 reach the port B of the three-way valve V 3. At the same time, the cold water from the cooling tower 100 flows into the boiler 400 through the pipe 24, After the temperature is raised by the boiler 400, it reaches the port A of the three-way valve V3, which merges at the three-way valve V3 and flows out from the port C, and passes through the ports A and C of the three-way valve V2 to heat the water heat source unit 300. It flows into the exchanger 301. And after passing there, it returns to the cooling tower 100 through the pipe 17 and the ports A and C of the three-way valve V1.
[0019]
According to this, since both the waste heat of the condenser 201 and the heat of the boiler 400 are used in the heat exchanger 301, sufficient heating efficiency is increased even when the heating load is large (for example, the outside air temperature is low). be able to.
[0020]
When the heating load is small, ports A and B of the three-way valve V4, ports B and C of the three-way valve V3, ports B and C of the three-way valve V2, and ports A and C of the three-way valve V1 are connected. The cold water from the cooling tower 100 flows into the condenser 201 of the water-cooled condensing unit 200 through the pipe 11, the pump P, and the pipe 12, as indicated by solid arrows in FIG. It flows into the heat exchanger 301 of the water heat source unit 300 through the pipe 13, the ports A and B of the three-way valve V 4, the pipe 15, the ports B and C of the three-way valve V 3, and the ports B and C of the three-way valve V 2. And after passing there, it returns to the cooling tower 100 through the pipe 17 and the ports A and C of the three-way valve V1.
[0021]
When the heating load is small (for example, the number of operating indoor units 310 is small), even if only the waste heat of the condenser 201 is used, sufficient heating efficiency can be increased. Therefore, by stopping the operation of the boiler 400, The wasteful use of fossil fuel can be eliminated and resource saving can be achieved.
[0022]
In short, according to this embodiment, by providing the boiler 400, it is possible to provide a system for a so-called cold region without being short of capacity when the heating load is large. Further, when the heating load is small, the operation of the boiler 400 can be stopped and switched to an operation using only the waste heat of the condenser 201, so that the efficiency of the heating operation can be improved. Furthermore, since the system uses the waste heat of the condenser 201, the capacity of the boiler 400 can be reduced as compared with the case where only the boiler 400 is used.
[0023]
【The invention's effect】
As is clear from the above description, by providing a boiler in the pipeline, heating using the heat of the boiler becomes possible. For example, when the heating load is small, the operation of the boiler is stopped and the condenser is discarded. Since it is possible to switch to operation using only heat, an economical system can be provided.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of an air conditioning system according to the present invention.
FIG. 2 is a system diagram showing the flow of cooling water when the heating load is large.
FIG. 3 is a system diagram showing the flow of cooling water when the heating load is small.
[Explanation of symbols]
100 Cooling tower 200 Water-cooled condensing unit 201 Condenser 210 Showcase 300 Water heat source unit 301 Heat exchanger 310 Indoor unit 400 Boiler V1 to V4 Three-way valve A to C Port

Claims (1)

A water-cooled condensing unit that forms a refrigeration cycle for a showcase connected through a showcase and a refrigerant pipe, and a water heat source unit for an air conditioner that forms a refrigeration cycle for an air conditioner connected through an indoor unit and a refrigerant pipe A cooling tower that generates cold water, and a condenser of the water-cooled condensing unit, a heat exchanger of the water heat source unit, and the cooling tower are connected by a pipe, and the cooling water from the cooling tower is cooled with the water-cooling In an air conditioning system that can be circulated to the water-type condensing unit and / or the water heat source unit, and can cool the showcase and air-condition the indoor unit by operating both refrigeration cycles, a boiler is connected to the pipe line, and heating is performed. During operation, the heat exchanger of the water heat source unit has a temperature raised by the boiler when the heating load is large. And hot water heated by the condenser of the water-cooled condensing unit are circulated, while when the heating load is small, the operation of the boiler is stopped and the hot water heated by the condenser of the water-cooled condensing unit is heated. Air conditioning system characterized by circulating only air.

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