KR100750375B1 - Combined cooling and heating system using 2-pass line wastewater heat recovery machine and heat pump - Google Patents

Abstract

The present invention supplies an optimal heat source heat-exchanged to a facility using cold water and hot water to an evaporator and a heat storage tank of a water-cooled heat pump, thereby using a 2-pass line wastewater heat recovery unit and a heat pump that can be used in a facility using cold water and hot water. It relates to a cooling and heating combined use system. The main configuration of the present invention and the raw water supply source in which raw water is stored; A wastewater supply source for storing wastewater of medium temperature; A cold storage tank for storing cold water in which raw water is cooled; By exchanging the raw water of the raw water supply source and the waste water of the waste heat supply source mutually, the temperature of the raw water is increased to convert it into primary hot water. A wastewater heat recovery unit for converting the waste water into reference water having a constant temperature; A heat storage tank storing primary hot water having an increased temperature while passing through the waste water heat recovery unit; The primary hot water stored in the heat storage tank is introduced into the condenser and heat exchanged with the internal high temperature refrigerant to raise the temperature of the primary hot water to a high temperature and convert it to a secondary temperature. A heat pump which is lowered and converted into cold water; And a hot water tank storing high temperature secondary hot water passing through the heat pump, wherein the cold water passing through the evaporator is stored in the cold storage tank.

Description

COOLING OR HEATING COMBINED SYSTEM USING 2-PASSLINE WASTE WATER EXCHANGER AND HEAT PUMP}

1 is a schematic diagram showing a waste heat recovery system using a conventional freezer

Figure 2 is a schematic diagram of a combined heating and cooling system using a heat pump and a two-pass line wastewater heat recovery of the present invention.

Figure 3 is a flow chart during heating of a combined heating and cooling system using a heat pump and a two-pass line wastewater heat recovery of the present invention.

Figure 4 is a flow chart for cooling the cooling and cooling system using a two-pass line wastewater heat recovery and heat pump of the present invention.

<Description of the symbols for the main parts of the drawings>

1: hot water supply source 2: waste water supply source

3: wastewater heat recovery unit 4: the first waste heat exchanger

5: second waste heat exchanger 6: heat pump

7: condenser 8: heat storage tank

9: hot water tank 9: facility using hot water

12: evaporator 13: cold storage tank

14: Facility using cold water

The present invention relates to a combined heat and cooling heat pump system using a two-pass line wastewater heat recovery device, and more particularly, by supplying an optimal heat source heat-exchanged to a facility condition using cold water and hot water to an evaporator and a heat storage tank of a water-cooled heat pump. The present invention relates to a two-pass line wastewater heat recovery system that can be used for facilities using cold water and hot water for four seasons, and a heating / cooling system using a heat pump.
Hereinafter, raw water, waste water, primary hot water, secondary hot water, reference water and secondary cold water used in the present invention are defined as follows. "Raw water" means water before it is supplied to the wastewater heat recovery unit, "waste water" means water having high temperature waste heat, and "primary hot water" means water whose temperature is increased by heat exchange with waste water in the wastewater heat recovery machine. "Secondary hot water" refers to water in which the primary hot water is heated in the condenser of the heat pump to increase the temperature than the primary hot water, and "reference water" refers to the mixed water of wastewater + cold water in the wastewater heat recovery machine. By heat exchange means water having a temperature of about 12 ° C., and “cold water” means the water cooled in the evaporator of the heat pump.

In general, in baths and saunas (Jjimjilbang), energy is recovered by recovering heat from wastewater used and discarded using wastewater heat recovery machines. 1 is a schematic diagram of a waste water heat recovery system using a conventional freezer of Korea Patent No. 10-574275.

1, the wastewater heat recovery system of the Republic of Korea Patent No. 10-574275 is connected to the water supply source 106 of the raw water to the evaporator 117 of the refrigerator 102, the evaporator 117 is a wastewater heat recovery machine ( 101) and circulates the incoming raw water to the appropriate temperature. In addition, the evaporator 117 is connected to the compressor 114 by a fluid conduit to have a large amount of heat by compressing the refrigerant having latent heat into the refrigerant of high temperature and high pressure through the evaporator. The compressor 114 is also connected to the condenser 115 by conduits. In this way, the high temperature and high pressure refrigerant passing through the compressor 114 passes through the condenser 115 to exchange heat with the raw water passing through the wastewater heat recovery 101, and the raw water accumulating heat is transferred through the circulation pump 111. The heat storage tank 103 is to be stored. The refrigerant passing through the condenser 115 causes a phase change at low temperature and low pressure while passing through the expansion valve 121, and then moves to the evaporator 117 to cool the raw water. In addition, the wastewater heat recovery unit 101 is connected to the wastewater supply source 107 such as the bath 120 to introduce waste heat. At this time, the raw water circulated through the evaporator 117 absorbs heat from the waste heat of high temperature passing through the waste water heat recovery unit 101 and is discharged to waste water having heat, and the waste heat is taken out of the waste heat outlet 108 after the heat is taken out. Through the waste heat of low temperature will be discharged.

A portion of the heat source passing through the wastewater heat recovery unit 101 may be supplied to the bath 120 by cold water through the cold water distributor 113, and the other part may be sent to the condenser 115 to absorb heat. The hot water stored in the heat storage tank 103 is stored in the hot water tank is supplied to the bath.

As described above, in the waste heat recovery system using the conventional refrigerator, instead of introducing the waste heat into the evaporator 117 of the refrigerator 102, the heat source is introduced into the evaporator 117 and circulated, and the inside of the evaporator 117 is circulated. A system that produces only pure hot water by passing a heat source into the wastewater heat recovery machine 101. Cooling and heating (including floor heating facilities) are not available in baths and saunas. When capacity is not controlled according to the temperature change of 5 ℃ (winter) ~ 25 ℃ (summer), frequent failure of the refrigerator and deterioration of performance (or no desired hot water production) occurs.In summer, waste heat temperature 34 ℃ and heat source Since little heat is obtained by heat exchange at a temperature of 25 ° C, the role of the wastewater heat recovery machine is very small. In the case of the conventional refrigerator using the R-22 refrigerant with a condensation temperature of 50 ℃, it does not supply the hot water of 60 ℃ generally required in baths and saunas (jjimjilbang), the disadvantage of the need for a boiler as an auxiliary heat source have.

Therefore, to date, there is no system without facility and auxiliary heat source using cold water and hot water by using a single system, and it is possible to improve the performance of refrigerator and heat exchanger and to reduce the breakdown of frequent heat exchanger. There has been a continuous demand.

The present invention is to solve the above problems, to provide a combined cooling and heating system using a heat pump and a two-pass line waste water heat recovery system without the combined use of auxiliary water source and cold water and hot water.

Another object of the present invention is to provide a cooling and heating combined system using a two-pass line wastewater heat recovery and heat pump that can be used for four seasons regardless of the temperature of the heat source by supplying the optimal heat source to the condenser and evaporator by recovering and removing the waste heat.

Still another object of the present invention is to supply a medium heat source supplied to a heat storage tank via a wastewater heat recovery device to a water-cooled heat pump condenser and a high temperature of a refrigerant. The present invention provides a dual-pass wastewater heat recovery system and a heating / cooling system using a heat pump that can heat a high-heat gas and heat-exchanged heavy heat source to produce a high heat source and store it in a heat storage tank for heating in a hot water facility.

It is another object of the present invention to provide a dual-pass wastewater heat recovery system and a heating / cooling system using a heat pump that can prevent frequent failures and deterioration by exchanging heat at an optimal temperature for cooling and heating in the 2-pass line waste heat recovery system. .

In order to achieve the above object, a two-pass line wastewater heat recovery system and a heating / cooling system using a heat pump include: a raw water supply source for storing raw water; A wastewater supply source for storing wastewater of medium temperature; A cold storage tank in which the cold water in which the raw water is cooled is stored; The raw water of the raw water supply source and the waste water of the waste heat supply source are mutually heat exchanged to increase the temperature of the raw water to convert it into primary hot water, and further, the mixed water of the waste water of the waste heat supply source and the cold water of the cold storage tank is mixed with the raw water of the raw water supply source. A wastewater heat recovery unit converting the raw water into reference water having a constant temperature by heat exchange with each other; A heat storage tank storing primary hot water having an increased temperature while passing through the waste water heat recovery unit; The primary hot water stored in the heat storage tank is introduced into a condenser to exchange heat with a high temperature refrigerant therein, thereby increasing the temperature of the primary hot water to a high temperature, converting it into a secondary temperature, and introducing the reference water into an evaporator to reduce the temperature of raw water. A heat pump that is lowered to a low temperature and converted into cold water; And a hot water tank for storing high temperature secondary hot water passing through the heat pump, wherein the cold water passing through the evaporator is stored in the cold storage tank.

Preferably, the wastewater heat recovery unit includes: a first waste heat exchanger configured to increase the temperature of the raw water by mutually heat-exchanging the raw water of the raw water supply source and the wastewater of the waste heat supply source; And a second wastewater heat exchanger configured to mutually heat-exchange the mixed water of the wastewater of the waste heat supply source with the cold water of the cold storage tank.

Preferably, the first temperature sensor for measuring the temperature of the raw water supply destination; And a solenoid valve for controlling a mixing ratio of the wastewater of the waste heat supply destination and the cold water of the cold storage tank according to the temperature measured by the first temperature sensor.

Preferably, the water level sensor for measuring the water level in the heat storage tank; If the water level measured by the water level sensor is the highest level, characterized in that it further comprises a shut-off valve for blocking the primary hot water flowing into the heat storage tank.

Preferably, it further comprises a second temperature sensor for measuring the temperature in the heat storage tank.

Preferably, the secondary hot water passing through the condenser is characterized in that it is transferred to the hot water tank when the reference temperature or more.

Preferably, the secondary hot water stored in the hot water tank is supplied to a heating facility, the cold water of low temperature stored in the storage tank is supplied to a cooling facility.

Preferably, the heat pump is characterized in that the water-cooled heat or air-cooled heat pump.

With reference to Figure 2 looks at in detail with the two-pass line wastewater heat recovery and the combined heating and cooling system using a heat pump. 2 is a schematic diagram of a combined heating and cooling system using a two-pass wastewater heat recovery unit and a heat pump according to the present invention, and FIG. 3 is a flow chart of a heating and cooling system using a two-pass wastewater heat recovery unit and a heat pump according to the present invention. 2 is a flow chart for cooling the cooling and cooling system using a two-pass line wastewater heat recovery device and a heat pump of the present invention.

As shown in Figure 2, the raw water supply destination (1) for storing the raw water; A wastewater supply source (2) in which wastewater of medium temperature is stored; A cold storage tank 13 in which cold water cooled by raw water is stored; The raw water of the raw water supply source and the wastewater of the waste heat supply source 2 are mutually heat-exchanged to increase the temperature of the raw water to convert it into primary hot water, and furthermore, the raw water of the raw water supply source 1 and the wastewater of the waste heat supply source 2 and A wastewater heat recovery unit (3) for exchanging the mixed water of cold water of the cold storage tank (13) to convert the temperature of the raw water into reference water having a constant temperature; The heat storage tank 8 through which the waste water heat recoverer 3 is stored and the primary hot water of which temperature is increased is introduced to the condenser 7 by introducing the primary hot water stored in the heat storage tank 8 into a condenser 7. Heat pump to heat the temperature of the primary raw water to the high temperature to convert to the second hot water, the heat exchanged with the mixed water and the reference water exchanged into the evaporator 12 to lower the temperature of the reference water to low temperature to convert it into cold water (6); It consists of a hot water tank (9) for storing the high-temperature secondary raw water passing through the heat pump (6). At this time, when the temperature of the secondary hot water passing through the condenser 7 of the heat pump 6 is below the reference temperature (60 ° C.), it is stored and circulated in the heat storage tank 8, and when the temperature of the secondary hot water is higher than the reference temperature, it is transferred to the hot water tank 9. Can be set to be transported.

Meanwhile, the wastewater heat recovery unit 3 exchanges heat between the raw water of the raw water supply source and the wastewater of the waste heat supply source to increase the temperature of the raw water and converts it into primary hot water, and the raw water and the waste heat of the raw water supply source. The second wastewater heat exchange part 5 converts the wastewater of the supply destination 2 and the mixed water of the cold water of the said cold storage tank 13 into mutually increasing the temperature of raw water, and converts it into a reference water.

In addition, the raw water supply unit 1 and the heat storage tank 8 are equipped with first and second temperature sensors 56 and 38 for measuring temperature, and the waste water of the waste heat supply unit 2 and the cold water of the cold storage tank 13. Solenoid valves (57, 58) for adjusting the mixing ratio of the.

In addition, the water level sensor 38 for measuring the water level is installed inside the heat storage tank 8, and if the water level measured by the water level sensor 38 is the highest level, the primary raw water flowing into the heat storage tank 8 is blocked. If the temperature of the shut-off valve 39 and the heat storage tank is more than a predetermined pressure pump 42 for discharging to the hot water tank (9) is further installed.

As such, the high temperature secondary raw water stored in the hot water tank 9 is supplied to the heating facility 10, and the low temperature cold water stored in the storage cooling tank 13 is supplied to the cooling facility 14.

Meanwhile, the heat pump 6 may selectively use a water-cooled heat pump or an air-cooled heat pump. When water-cooled heat pump is used, the efficiency of lowering the temperature of cold water is low because the temperature of the refrigerant is high in summer, and when the air-cooled heat pump is used, the efficiency of raising the temperature of secondary hot water is low because the temperature of the refrigerant is too low in winter. There is.

Hereinafter, the details of the operation of the water-cooled heat pump using the waste water heat recovery according to the present invention will be described in detail.

 (1) Hot water production and heating facilities using hot water

As shown in FIG. 3, raw water of the raw water supply source 1 (about 5 ° C. in winter, about 15 ° C. in summer and about 25 ° C. in summer) is provided through the first conduit 31. It is supplied to the 1st waste heat exchange part 4 of the wastewater heat recovery machine 3. The wastewater at about 32 to 34 ° C. of the waste heat supply source 2 is supplied to the first waste heat exchanger 4 of the wastewater heat recovery machine 3 through the second conduit 32. Accordingly, in the first waste heat exchange unit 4, the raw water of the low temperature and the waste water of the high temperature travel in opposite directions to exchange heat with the raw water supplied to the first conduit 31.

In the first waste heat exchange unit 4, the raw water and the waste water flowing in opposite directions are exchanged with each other, and the hot water passing through the first waste heat exchange unit 4 is the primary hot water having an increased temperature. It is stored in the heat storage tank (8) through. The wastewater that has passed through the first waste heat exchanger 4 is reduced in temperature and discharged to the outside through the fourth conduit 34.

Primary hot water stored in the heat storage tank (8) is introduced into the condenser (7) of the water-cooled heat pump (6) through the fifth conduit (35). The primary hot water at 30 ° C. introduced into the condenser (7) inlet is heat exchanged with the condensation heat (65 ° C.) of the refrigerant circulating in the refrigerant pipe of the heat pump (6). It is stored again in the heat storage tank (8) via (36). Secondary hot water introduced into the heat storage tank (8) is mixed with the primary hot water in the heat storage tank (8) and flows back into the condenser (7) of the heat pump to heat exchange.

As described above, the heat storage tank and the condenser 7 are repeatedly circulated to be stored in the hot water tank 9 through the seventh conduit 37 when the temperature of the heat storage tank is about 60 ° C. At this time, when the water level measured by the water level sensor 38 for measuring the water level in the heat storage tank 8 is the highest water level, the shutoff valve 39 is closed to close the heat storage tank (1) in the first waste heat exchanger (4). 8) The primary hot water flowing into is blocked. In addition, the secondary hot water heat exchanged in the condenser (7) may be stored directly in the hot water tank (9) instead of being stored in the heat storage tank (8).

Secondary hot water stored in the hot water tank (9) is supplied to the place of use (11) where secondary hot water is used through the eighth conduit (40) or the heating facility (10) through the ninth conduit (41) to heat Can be used for

This has the characteristics that heating can be realized in a heating facility using hot water in a hot water production system using a conventional wastewater heat recovery system, and that the auxiliary heat source (oil, gas) boiler can be removed.

(2) Cooling facilities using cold water production and cold water

As shown in FIG. 4, the raw water of the raw water supply source 1 is supplied to the second waste heat exchanger 5 of the wastewater heat recovery unit through the eleventh conduit 51. In addition, the twelfth conduit 52 connected to the waste heat supply source 2 and the thirteenth conduit 53 connected to the cold storage tank are coupled to each other so that the mixed water in which the hot waste water and the cold cold water are mixed is connected to the fourteenth conduit 54. It is supplied to the second waste heat exchanger (5) through. On the other hand, the raw water and the mixed water is heat-exchanged so that the raw water is a reference water having a temperature of about 12 ℃ while proceeding in the opposite direction in the second waste heat exchange unit (5). The reference water passing through the second waste heat exchanger 5 is introduced into the evaporator 12 of the heat pump through the fourteenth conduit 55.

At this time, mixing and adjusting the solenoid valves (57, 58) installed in the twelfth conduit (52) and the thirteenth conduit (53) according to the temperature of the raw water measured by the first temperature sensor (56) installed in the raw water supply source (1) The ratio of waste water to cold water is controlled. That is, the temperature of the raw water supplied from the heat source supply source is winter (5 ℃), season (15 ℃), summer (25 ℃), and when raw water having different temperature is directly supplied to the evaporator of the heat pump, the raw water in winter The temperature of the water is too low to produce hot water, and in summer, the temperature of raw water is too high, causing product failure due to overheating of the evaporator. Therefore, in the winter, when the raw water temperature measured by the first temperature sensor 56 is 5 ° C, the solenoid valve 58 flowing from the cold storage tank 13 is closed to make the raw water temperature of 12 ° C, and the wastewater supply source 2 The temperature of the mixed water can be increased by controlling the flow rate supplied from the wastewater. On the contrary, when the raw water temperature measured by the first temperature sensor 56 is 25 ° C. in summer, the waste water supply source 2 By closing the solenoid valve 57 of the ()) and controlling the solenoid valve 58 of the cold storage tank 13, the temperature of the mixed water can be maintained by lowering the temperature of the mixed water.

The reference water of about 12 ° C introduced into the evaporator 12 of the heat pump is heat-exchanged with the heat of evaporation of the refrigerant circulating in the refrigerant pipe of the heat pump 6 to cool to about 7 ° C, and the cold water passes through the sixteenth conduit 59. Through the storage tank 13 is stored. The cold water stored in the cold storage tank 13 is supplied to the cooling facility 4 through the seventeenth conduit 60 or the raw water supply source 1 through the eighteenth conduit 61.

On the other hand, the cooling facility (4) using cold water is a device for cooling by using a fan inside the cooling facility by introducing cold water. This can realize a system capable of cooling by storing the cold water produced by the evaporator in the cold storage tank in the system that was only producing hot water.

As described above, the two-pass line wastewater heat recovery unit and the cooling and heating system using the heat pump of the present invention can be used as a facility using the four seasons cold water and hot water, and using the water-cooled heat pump to cool the cooling facilities and There is a big advantage that can be heated by heating and heating using the device using the heating and heating using the device.

In addition, since the heat exchange at the optimum temperature for cooling and heating in the 2-pass line waste heat recovery machine, there is an advantage that can prevent frequent failures and performance degradation due to excessive temperature difference.

In addition, the heavy heat source supplied to the heat storage tank via the waste water heat recovery machine is supplied to the water-cooled heat pump condenser to obtain a high temperature of the refrigerant. Since the heavy heat source heat-exchanged with high pressure gas is circulated in the heat storage tank by producing a high heat source, there is an advantage of raising the temperature to an appropriate temperature.

In addition, since it does not require a boiler as an auxiliary heat source, it does not use a separate energy other than electrical energy can significantly reduce energy savings.

Claims (9)

A raw water supply source for storing raw water; A wastewater supply source for storing wastewater of medium temperature; A cold storage tank in which the cold water in which the raw water is cooled is stored; The raw water of the raw water supply source and the waste water of the waste heat supply source are mutually heat exchanged to increase the temperature of the raw water to convert it into primary hot water, and further, the mixed water of the waste water of the waste heat supply source and the cold water of the cold storage tank is mixed with the raw water of the raw water supply source. A wastewater heat recovery unit converting the raw water into reference water having a constant temperature by heat exchange with each other; A heat storage tank storing primary hot water having an increased temperature while passing through the waste water heat recovery unit; The primary hot water stored in the heat storage tank is introduced into a condenser to exchange heat with a high temperature refrigerant therein, thereby increasing the temperature of the primary hot water to a high temperature, converting it into a secondary temperature, and introducing the reference water into an evaporator to reduce the temperature of raw water. A heat pump that is lowered to a low temperature and converted into cold water; And a hot water tank for storing the high temperature secondary hot water that has passed through the heat pump. The wastewater heat recovery unit according to claim 1, further comprising: a first waste heat exchanger configured to increase the temperature of the raw water by mutually heat-exchanging the raw water of the raw water supply source and the wastewater of the waste heat supply source; And a second wastewater heat exchanger configured to mutually heat-exchange the mixed water of the wastewater of the waste heat supply source and the cold water of the cold storage tank with the raw water of the raw water supply source. The system of claim 1, wherein the cold water passing through the evaporator of the heat pump is stored in the cold storage tank. According to claim 1, A first temperature sensor for measuring the temperature of the hot water supply destination; Combined with a two-pass line waste water heat recovery unit and a heat pump, characterized in that it further comprises an electromagnetic valve for controlling the mixing ratio of the waste water of the waste heat supply source and the cold water of the cold storage tank according to the temperature measured by the first temperature sensor. system. The liquid crystal display of claim 1, further comprising: a water level sensor measuring a water level inside the heat storage tank; And a two-pass line wastewater heat recovery unit and a heat pump using a heat pump if the water level measured by the water level sensor is the highest level. The system of claim 1, further comprising a second temperature sensor for measuring a temperature in the heat storage tank. According to claim 1, The second hot water passing through the condenser of the heat pump is stored in the heat storage tank, and is transferred to the hot water tank when the reference temperature or more, characterized in that the two-pass line waste water heat recovery and heating and cooling using the heat pump Combined system. The system of claim 1, wherein the secondary hot water stored in the hot water tank is supplied to a heating facility, and the cold water stored in the cold storage tank is supplied to a cooling facility. . The system of claim 1, wherein the heat pump is any one of a water-cooled heat pump and an air-cooled heat pump.

Images