JP2002130862A - Air-conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize effectively waste heat generated upon cooling high-pressure and high-temperature gas pressurized in a compressor and restrain the discharging of the waste heat, which will become the cause of global warming effect into atmosphere in an air-conditioning system. SOLUTION: A water-cooled heat exchanger 8 is arranged between the compressor CM and a condenser 3 in the air-conditioning system to obtain hot-water, heated by cooling the high-pressure and high-temperature gas pressurized in the compressor CM. The heat exchanger 8, through which the high-pressure and high-temperature gas is circulated, is dipped into a hot-water storage tank 7 and is structured so as to have a water feeding means 9i for the hot-water storage tank 7 and a discharging means 9o of the heated hot-water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for effectively utilizing waste heat generated when cooling and condensing high-pressure high-temperature gas compressed by a compressor in an air conditioning system.

[0002]

2. Description of the Related Art In an ordinary air conditioning system, high-temperature hot air is generated from a condenser during cooling. Particularly, in large-scale facilities such as hotels and hospitals, a large number of air conditioning systems are installed, so that the amount of waste heat generated from each condenser is enormous.

[0003] Discharging such a large amount of waste heat into the atmosphere causes global warming and causes environmental degradation.

[0004] In addition, if the waste heat wasted as described above can be used for hot water supply and the like, the waste heat is effectively used, and efficient use of energy can be realized.

[0005] The technical problem of the present invention is to focus on such a problem and to suppress the release of waste heat to the atmosphere, which causes global warming, and to use such waste heat for hot water supply and the like. The purpose is to make it possible to use it effectively.

[0006]

The technical problem of the present invention is solved by the following means. According to the first aspect of the present invention, a water-cooled heat exchanger is disposed between the compressor and the condenser of the air conditioning system, so that hot water heated by cooling the high-pressure high-temperature gas pressurized by the compressor is obtained. Air conditioning system.

As described above, the water-cooled heat exchanger is provided between the compressor and the condenser, and the high-pressure high-pressure gas pressurized by the compressor is condensed by water-cooling. A large amount of waste heat can be suppressed from being released into the atmosphere from the vessel. In addition, since the cooling water is heated by the high-pressure high-temperature gas, hot water used for a bath or the like can be obtained, energy for boiling the bath can be reduced, and efficient use of energy can be realized.

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, a refrigerant coil in which a high-pressure high-temperature gas circulates is immersed in a hot water tank, and a means for supplying water to the hot water tank is heated. This is an air conditioning system having hot water discharging means.

As described above, since the hot water storage tank is used as the heat exchanger and the refrigerant coil in which the high-pressure high-temperature gas circulates is immersed in the hot water storage tank, the high-pressure high-temperature gas can be reliably water-cooled and condensed. Moreover, since it has a means for supplying water to the hot water tank and a means for discharging heated hot water, if tap water or the like is supplied to the hot water tank and heated water is supplied from the discharge means to the boiler or the like, the boiler can be cooled. Fuel costs can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of how the air conditioning system according to the present invention is actually embodied will be described. FIG. 1 is a piping diagram showing the entire air conditioning system according to the present invention. 1 is an outdoor unit and 2 is an indoor unit.

The outdoor unit 1 has a compressor C for pressurizing the low-pressure gas flowing from the indoor unit 2 into a high-pressure gas.
M. Further, a condenser 3 for cooling the high-pressure high-temperature gas pressurized by the compressor CM is provided. This condenser 3 has a condensing fan 4 in the case of an air cooling type.

The high-pressure refrigerant liquid condensed in the condenser 3 is reduced in pressure by the next expansion valve 5 to become a low-pressure gas, and is supplied to the indoor unit 2. Reference numeral 6 denotes an indoor unit fan. Then, the refrigerant gas that has taken indoor heat and evaporated in the indoor unit 2 is sucked into the compressor CM of the outdoor unit 1.

Reference numeral 7 denotes a hot water storage tank according to the present invention, which has a built-in heat exchanger 8 through which high-pressure high-temperature gas sent from the compressor CM to the condenser 3 circulates.

Water supply pipe 9 for supplying cooling water to hot water storage tank 7
i, and a drain pipe 9o for discharging heated water heated by the high-pressure high-temperature gas.

Therefore, the high-pressure high-temperature gas pressurized by the compressor CM is first cooled by water when passing through the heat exchanger 8 and condensed, and then expanded in the state of high-pressure liquid through the next condenser 3. The air is sent to the valve 5 and decompressed.

When the high-pressure high-temperature gas is cooled and condensed in the hot water storage tank 7, the next condensing fan 4 does not need to function. Therefore, when the condensation pressure is detected by connecting the pressure switch SW and the condensation is completed by the hot water storage tank 7, since the refrigerant gas pressure is low, the condensing fan 4 is not operated, and the refrigerant gas pressure is insufficient due to insufficient condensation. Is high, the condensing fan 4 is operated.

Therefore, when the cooling water is heated in the hot water storage tank 7 and the cooling capacity is reduced, the pressure switch SW
As a result, the power of the condensing fan 4 is turned on, and condensing is performed by air cooling.

As described above, while the refrigerant gas is being cooled by water cooling, the condensing fan 4 of the outdoor unit is stopped, so that the electric bill can be saved accordingly.

FIG. 2 is a piping diagram illustrating a cooling water supply / drainage structure. Hot water tank 7 is filled with cooling water 14. The high-pressure high-temperature gas pressurized by the compressor of the outdoor unit 1 circulates and condenses in the heat exchanger 8 immersed in the cooling water 14.

The cooling water 14 in the hot water storage tank 7 is supplied from a water pipe and flows in from a water supply pipe 9i. Hot water heated when the high-pressure high-temperature gas pressurized by the compressor is cooled by the heat exchanger 8 flows out from the drain pipe 9o, and is supplied to the hot water supply boiler B.
And a water supply faucet 10 such as a washing machine.

Assuming that the water temperature at the time of inflow from the water pipe is 28 ° C., the water is heated to a maximum of about 40 ° C. and flows out. In facilities such as hotels, hospitals, restaurants, nursing homes, etc., a large number of air conditioning systems are operating, so a large amount of waste heat is released into the atmosphere, leading to global warming. The generation of heat can be suppressed, and the heat source can be effectively used for hot water supply.

The heat exchanger 8 in the hot water storage tank 7 has a flare nipple N so that refrigerant can be easily piped from the outdoor unit 1.
1, piping via N2.

FIG. 3 is a perspective view of the hot water storage tank 7. Tap water flows into the hot water storage tank 7 from a water supply pipe 9i connected to the water pipe. The hot water heated by cooling the high-pressure high-temperature gas flowing into the heat exchanger 8 flows out of the drain pipe 9o and is supplied to a hot water boiler or the like as shown in FIG.

An opening through which the heat exchanger 8 is inserted and removed during maintenance and service is opened in the side wall of the hot water tank 7, and is usually closed by a detachable plate 12. The root of the heat exchanger 8 penetrates the detachable plate 12 and is fixed to the detachable plate 12. And outside the hot water tank 7, the flare nipple N1,
N2 is attached. Therefore, these flare nipples N1 and N2 are connected to the compressor and the condenser side.

A drain pipe 13 is provided at a lower portion of the side wall of the hot water storage tank 7 so that the drain can be drained when the inside of the hot water storage tank 7 is cleaned.

The above embodiment has a structure in which the high-pressure high-temperature gas in the heat exchanger 8 is directly cooled by the cooling water flowing into the hot-water storage tank 7, but FIG. 4 shows an indirect cooling type hot-water storage. It is a schematic cross section of a tank.

A heat exchanger 8 through which high-pressure high-temperature gas pressurized by a compressor circulates is immersed in water 14 in a hot water storage tank 7. A cooling water coil 15 is connected to the cooling water supply pipe 9i and the heating water drain pipe 9o, and the cooling water coil 15 is also immersed in the water 14 of the hot water storage tank 7.

Therefore, the high-pressure high-temperature gas flowing into the heat exchanger 8 from the compressor is cooled by the water 14 in the hot water storage tank 7 and condensed. Water 1 heated by this cooling
4 is cooled by the cooling water passing through the cooling water coil 15.

Conversely, the cooling water in the cooling water coil 15 is heated by the water 14 in the hot water storage tank 7 and supplied from the drain pipe 9o to a boiler of a water heater.

In the above embodiment, only a single heat exchanger 8 is built in the hot water storage tank 7. However, when there are a plurality of air conditioning systems, a plurality of outdoor units connected to a plurality of outdoor units are provided. By incorporating the heat exchanger, a plurality of outdoor units can be simultaneously water-cooled and condensed in a single hot water storage tank.

The air conditioning system also has a structure in which a compressor and an expansion valve are incorporated in an indoor unit, but it goes without saying that the present invention can be applied to such a structure.

[0032]

According to the present invention, a water-cooled heat exchanger is provided between the compressor and the condenser to condense the high-pressure high-temperature gas pressurized by the compressor by water-cooling. It is possible to suppress a large amount of waste heat from being released into the atmosphere from the condenser as in the related art.

Moreover, since the cooling water is heated by the high-pressure high-temperature gas, hot water used for a bath or the like can be obtained, the energy for boiling the bath can be reduced, and the energy can be efficiently used.

According to a second aspect of the present invention, a hot water storage tank is used as the heat exchanger, and a refrigerant coil for circulating a high-pressure high-temperature gas is immersed in the hot water storage tank. Can be condensed.

In addition, since it has a means for supplying water to the hot water storage tank and a means for discharging heated water, tap water or the like is supplied to the hot water storage tank, and heated water is supplied from the discharge means to a boiler or the like. , Which can save boiler fuel costs.

In addition, the heat exchanger and the hot water storage tank of the present invention can be realized in a very simple and inexpensive structure, and the provision of the heat exchanger does not cause any trouble to the air conditioning system. Therefore, it can be easily realized. In addition to the system to be manufactured, it is possible to add additional equipment to the existing system in operation.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing the entire air conditioning system according to the present invention.

FIG. 2 is a piping diagram illustrating a cooling water supply / drain structure.

FIG. 3 is a perspective view showing an example of a heat exchanger.

FIG. 4 is a schematic sectional view of a heat exchanger of the indirect cooling type.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Indoor unit CM compressor 3 Condenser 4 Condensing fan 5 Expansion valve (capillary tube) 6 Indoor unit fan 7 Hot water storage tank 8 Heat exchanger 9i Water supply pipe 9o Drainage pipe SW Pressure switch (for condensing fan start / stop) B Boiler DESCRIPTION OF SYMBOLS 10 Faucet N1, N2 Flare nipple 12 Removable plate 13 Drain pipe 14 Water 15 Cooling water coil

Claims (2)

[Claims] 1. A water-cooled heat exchanger is disposed between a compressor and a condenser of an air conditioning system so that hot water heated by cooling high-pressure high-temperature gas pressurized by the compressor is obtained. An air conditioning system characterized in that: 2. The heat exchanger according to claim 1, wherein a refrigerant coil for circulating high-pressure high-temperature gas is immersed in the hot water tank, and has a means for supplying water to the hot water tank and a means for discharging heated hot water. The air conditioning system according to claim 1, wherein: