KR20170117648A - Two stage Heatpump - Google Patents

Abstract

The heat pump employing the two-cycle system according to the present invention includes a first compressor (10) which uses hot water of a power plant, seawater or wastewater as a heat source, and compresses a low temperature low pressure gaseous pressurized working fluid into a high temperature and high pressure gaseous state, A first condenser 20 for generating hot water by exchanging heat between the hot working fluid supplied from the first compressor 10 and cold water at a low temperature and a second working fluid which is heat exchanged in the first condenser 20 A first expansion valve 30 for expanding and expanding the refrigerant to a relatively low-temperature and low-pressure state, and a second expansion valve 30 for exchanging the working fluid gasified at the first expansion valve 30 by an external heat source, And a first evaporator 40 for transferring the working fluid in a low-temperature low-pressure gaseous state to a high-temperature gas state of a high temperature and a high pressure higher than that of the first compressor 10, Compressor 50 )Wow; A second condenser 60 for generating hot water by performing heat exchange with the hot fluid supplied from the first condenser 20 to the high temperature working fluid in the high temperature and high pressure gaseous state supplied from the second compressor 50, Wow; A second expansion valve (70) for receiving the heat exchanged working fluid in the second condenser (60) to expand and expand the expanded working fluid to a relatively low temperature and low pressure gas state; And a second evaporator (80) configured to heat-exchange the working fluid vaporized at the second expansion side (70) by an external heat source and transfer it to the second compressor (10) And it is possible to secure safety and high efficiency by applying the two-cycle cycle. By using the plate type heat exchanger and the tubular type heat exchanger as the heat exchanger, it is possible to use any heat source such as waste water, seawater and ground water with high anti- Provides an installation-friendly effect in locations where heat sources are lacking.

Description

A two-stage heat pump using a two-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat pump, and more particularly, to a heat pump using a two-cycle system in which efficiency is improved by applying a plate or tubular heat exchanger.

Generally, a heat pump is composed of an evaporator, a compressor, a condenser, and expansion valves, so that the circulating medium repeats liquefaction and vaporization to perform cooling and heating through other peripherals connected thereto.

Although these heat pumps use electric energy as a main energy source for cooling and heating, in recent years, they have been performing cooling and heating by using waste heat or geothermal heat as a main heat source in terms of energy saving.

However, when the heat pump that has been performing the heating and cooling by this energy is suddenly stopped due to a trouble or the like, the entire system for performing the heating and cooling also stops accordingly, so that the user who uses the heat pump has suffered a lot of troubles have.

Accordingly, some users have installed a heating and cooling apparatus including a boiler separately and have made redundant investment in preparation for the failure of such a heat pump.

In addition, since the conventional heat pump consumes energy continuously through the peripheral devices connected to the heat pump, the heat pump is performing the cooling and heating operation.

In order to solve such a problem, the conventional compressor disclosed in Japanese Unexamined Patent Application Publication No. 10-2014-0089278 discloses a compressor having a first compressor 101, a first heat exchanger 102, a first expansion valve 105, Side refrigerant circulating through the first heat exchanger (102) to the hot water tank (103) while circulating the high-temperature refrigerant through the second heat exchanger (106) (100); A closed loop is formed in the second compressor 203 and the second heat exchanger 106 by the air heat source acquisition unit 210 including the third expansion valve 213 and the outside air evaporator 214 so that the low temperature side refrigerant circulates Or a closed loop is formed in the second compressor 203 and the second heat exchanger 106 by the third heat exchanger 205 connected to the second expansion valve 204 and the cold water tank 206 Side refrigerant circulating in the outdoor heat exchanger (214) or the third heat exchanger (205) when heating or cooling operation is performed by selecting the heat of the low- And a low-temperature side cycle (200) for transferring the refrigerant to the high-temperature side refrigerant through the two-heat exchanger (106). The two-cycle heat pump cooling / (220), and among these, A fourth heat exchanger (104) which is connected to the first heat exchanger (102) and the first expansion valve (105) and is connected to the first heat exchanger (104) while being supplied with a heat source; And a heat medium circulation unit connected to the other side of the fourth heat exchanger (104), wherein the heat medium circulation unit is configured to circulate the first heat medium, which is circulated through the fourth heat exchanger (104) When the heating operation is performed, the heat of the high-temperature side refrigerant condensed in the heat exchanger 102 is transferred to the selected one heat source acquisition unit. On the other hand, when the cooling operation is performed, the air heat source acquisition unit 210, (220), and discharges the air from the heat exchanger (220) through the heat exchanger (220).

In addition, in the '140 patent, a sauna system using waste heat, the sauna system includes a house mosquito 100 for removing foreign substances from wastewater discharged from a bathing area including a sauna and filtering the waste water; A wastewater heat collecting unit 200 for raising the temperature of the fresh water obtained by the heat of the wastewater connected to the collection mosquito and delivered thereto; A wastewater storage tank (300) connected to the waste water heat recovery unit to store wastewater; A heat pump (400) connected to the waste water storage tank and connected to the waste water storage tank and receiving the heat of the waste water stored in the waste water storage tank by a circulation pump; And the water stored in the tank is circulated by the circulation pump to increase the temperature of the water in the heat pump and stored. When the temperature of the water is raised from the waste water heat collecting device, A hot water tank 500 provided with a temperature sensor for supplying hot water corresponding to a bathing area including a sauna and measuring temperature; A gas boiler 600 connected to the hot water tank and circulating water stored in the tank by a circulation pump to raise the temperature of water in the hot water tank; And a waste water pump (800) for sending the waste water stored in the waste water storage tank to the collector to be utilized for heat recovery. The heat pump has a temperature of the hot water tank determined by the user according to the light load, the heavy load, In the range, the temperature range determined by the user from the light load to the maximum load has a continuous temperature value, operation is started when the temperature is below the minimum value of the temperature range, operation is terminated when the temperature exceeds the maximum value, The gas boiler is operated when the temperature of the hot water stored in the hot water tank is below the temperature corresponding to the minimum value minus 5 in the temperature range of the continuous temperature value and exceeds the minimum temperature value determined in the temperature range of the continuous temperature value And the operation is stopped when the steam is supplied to the steam generator.

However, in using the waste water as a heat source, it is difficult to clean the heat exchanger even though the degree of contamination of the heat exchanger is increased.

KR 10-1543662 B1 KR 10-2014-0089278 A KR 10-1416207 B1

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems of the prior art.

More specifically, the object of the present invention is to make the heat pump system more efficient in operating the heat pump system, and to use various heat sources such as wastewater and seawater without limitation.

In order to achieve the above object, the heat pump employing the two-cycle system according to the present invention uses a hot water of a power plant, seawater or wastewater as a heat source, compresses a hot, low- A first condenser 20 for generating hot water by exchanging heat between the hot working fluid and low temperature cold water supplied from the first compressor 10; A first expansion valve (30) that receives and transfers the heat exchanged working fluid to a relatively low-temperature and low-pressure gaseous state by expanding the working fluid; and a second expansion valve And a first evaporator 40 for delivering the low-temperature low-pressure gaseous working fluid to the first compressor 10 of the first compressor 10. The high-temperature and high- A second compressor (50) to make the state; A second condenser 60 for generating hot water by performing heat exchange with the hot fluid supplied from the first condenser 20 to the high temperature working fluid in the high temperature and high pressure gaseous state supplied from the second compressor 50, Wow; A second expansion valve (70) for receiving the heat exchanged working fluid in the second condenser (60) to expand and expand the expanded working fluid to a relatively low temperature and low pressure gas state; And a second evaporator (80) configured to heat-exchange the working fluid vaporized at the second expansion side (70) by an external heat source and transfer it to the second compressor (10) do.

As described above, according to the present invention, safety and high efficiency can be secured by applying a two-cycle cycle, and a plate heat exchanger and a tubular heat exchanger are used as a heat exchanger, It can be used in a place where the heat source is insufficient.

1 is an operational example of a typical heat pump;
2 is a view illustrating an operation of a heat pump applying a two-cycle system according to an embodiment of the present invention;
3 is an explanatory view of a screw compressor of the present invention;
4 is an explanatory diagram of a plate heat exchanger of the present invention;
5 is an explanatory diagram of a natura-type heat exchanger of the present invention;

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 1 is a diagram illustrating an operation example of a conventional heat pump, FIG. 2 is a diagram illustrating an operation example of a heat pump using a two-cycle system according to an embodiment of the present invention, FIG. 4 is an explanatory view of a plate heat exchanger of the present invention, and FIG. 5 is an explanatory view of a natura-type heat exchanger of the present invention.

Referring to FIG. 2, the heat pump employing the two-cycle cycle system according to the present invention includes a first compressor 10 for compressing a low-temperature and low-pressure gaseous working fluid into a gaseous state at a high temperature and a high pressure, A first condenser 20 for generating hot water by exchanging heat between the hot working fluid supplied from the first condenser 20 and cold water at a low temperature and a second condenser 20 for expanding the working fluid heat exchanged in the first condenser 20, A first evaporator 30 for converting a working fluid gasified at the first expansion 30 into an external heat source and transferring the working fluid to the first compressor 10, A second compressor (50) having a first cycle consisting of a low-temperature low-pressure gaseous state and a high-temperature high-pressure gaseous state that is higher than the first compressor (10) by compressing the working fluid; A second condenser 60 for generating hot water by performing heat exchange with the hot fluid supplied from the first condenser 20 to the high temperature working fluid in the high temperature and high pressure gaseous state supplied from the second compressor 50, Wow; A second expansion valve (70) for receiving the heat exchanged working fluid in the second condenser (60) to expand and expand the expanded working fluid to a relatively low temperature and low pressure gas state; And a second evaporator (80) configured to heat-exchange the working fluid vaporized at the second expansion side (70) by an external heat source and transfer it to the second compressor (10) do.

The above configuration will be described in detail.

The heat pump to which the two-cycle cycle system of the present invention is applied is composed of a two-cycle cycle divided into a first cycle and a second cycle. The first and second compressors 10 and 50 and the first and second compressors (20, 60), first and second expansion valves (30, 66), and first and second evaporators (41, 42).

First, in the first cycle, a low-temperature, low-pressure gaseous working fluid is compressed by the first compressor 10, compressed into a high-temperature and high-pressure gaseous state, and transferred to the first condenser 20. The first compressor 10 compresses the operating fluid to provide a warm operating fluid within the range of 50 to 60 ° C.

Next, the working fluid in the high-temperature, high-pressure gaseous state supplied from the first compressor 10 is heat-exchanged with the circulating low-temperature water while passing through the first condenser 20, and is condensed into a high-temperature high-pressure liquid. In addition, the water that has been heat-exchanged in the first condenser 20 is sent to the second condenser 60 while being heated to about 55 ° C.

Next, the high-temperature and high-pressure working fluid, which has undergone the heat exchange as described above, is conveyed to the first expansion side 30 through the first condenser 20 and the condensed working fluid.

The working fluid gasified at the low temperature and low pressure by the first expansion valve 30 flows into the first evaporator 40 and is heat-exchanged and circulated to the first compressor 10 again.

Next, the second cycle according to the present invention will be described. The second compressor 50, the second condenser 60, the second expansion valve 70, the second evaporator 80, The hot water from the first condenser 20 of the same first cycle is supplied to the second condenser 60 and the second condenser 60 is supplied with hot water of high temperature and high pressure, Heat exchange between fluid and hot water generates high temperature water of 75 ℃ or more. To this end, the second compressor (50) compresses the working fluid in a low-temperature and low-pressure gaseous state into a high-temperature gas state having a higher temperature and a higher pressure than that of the first compressor (10) .

Here, in heating the water (water) at a normal temperature of about 20 캜 to high temperature water of 70 to 75 캜, the temperature difference? T 1 of the working fluid supplied at about 55 캜 and the water at room temperature of about 20 캜 = 75-20 = 35 ° C. In the second condenser 60, the temperature difference between the hot water of 55 ° C and the high-temperature working fluid of 75 ° C through the first condenser is about? T2 = 75-55 = 20 ° C. The second compressor (50) has a relatively low capacity and a relatively small capacity as compared with the first compressor (50), the energy consumption rate is as low as about 57%, and the overload is hardly generated.

Next, the working fluid in the high-temperature and high-pressure state, which has escaped from the second condenser 60, is supplied to the second evaporator 80 through the second expansion valve 70.

The working fluid transferred to the second expansion valve 70 flows into the second evaporator 80 and circulates and supplies the working fluid back to the second compressor 50 through the second expansion valve 70 do.

As shown in FIG. 3, the first compressor 10 and the second compressor 50 are constructed such that two rotors having concave side surfaces and convex side surfaces in a cylinder are paired and rotated to engage the refrigerant gas sucked in the axial direction And a screw compressor which is compressed in a high temperature and high pressure while being pushed in the opposite direction is used.

As shown in FIG. 4, the first and second condensers 20 and 60 are each a plate heat exchanger using SUS316 material having a high corrosion resistance and an allowable temperature of 200.degree. C., as shown in FIG.

As shown in FIG. 5, the first evaporator 40 and the second evaporator 80 use a tubular heat exchanger in which a titanium straight pipe is bent and an open tank is applied.

The above-mentioned tubular heat exchanger is mostly banded to minimize the welded portion, thereby reducing the defect rate due to corrosion. It is effective in preventing the scale by efficiently making the interval of the titanium straight pipe, and is easy to clean and clean by using the open tank, The heat exchanging ability is improved and the thermal efficiency is also excellent for long-term use.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

10: first compressor 50: second compressor
20: first condenser 60: second condenser
30: first expansion valve 70: second expansion valve
40: first evaporator 80: second evaporator

Claims (4)

A first compressor 10 which uses a hot water of a power plant or seawater or wastewater as a heat source and compresses a hot working fluid in a low temperature and low pressure gaseous state into a gaseous state at a high temperature and a high pressure; A first condenser 20 for generating hot water by exchanging heat between the hot working fluid and the cold cold water, and a second condenser 20 for receiving the working fluid heat exchanged in the first condenser 20 to expand the hot working fluid to a relatively low- And a first evaporator 40 for exchanging the working fluid gasified at the first expansion 30 by an external heat source and delivering the heat to the first compressor 10 , ≪ / RTI >
A second compressor (50) for compressing a working fluid in a low-temperature low-pressure gaseous state to produce a high temperature and high-pressure gaseous state higher than the first compressor (10); A second condenser 60 for generating hot water by performing heat exchange with the hot fluid supplied from the first condenser 20 to the high temperature working fluid in the high temperature and high pressure gaseous state supplied from the second compressor 50, Wow; A second expansion valve (70) for receiving the heat exchanged working fluid in the second condenser (60) to expand and expand the expanded working fluid to a relatively low temperature and low pressure gas state; And a second evaporator (80) configured to heat-exchange the working fluid vaporized at the second expansion side (70) by an external heat source and transfer it to the second compressor (10) Heat pump with dual cycle method. The method according to claim 1,
The first compressor (10) and the second compressor (50) are arranged such that two rotors having a concave side surface and a convex side surface in a cylinder are paired and rotated, while pushing the refrigerant gas sucked in the axial direction in the opposite direction, Wherein the compressor is a screw compressor that compresses the refrigerant in the heat exchanger. The method according to claim 1,
Wherein the first condenser (20) and the second condenser (60) are plate heat exchangers using SUS316 material having a high anti-corrosiveness and an allowable temperature of 200 DEG C. The method according to claim 1,
Wherein the first evaporator (40) and the second evaporator (80) use a twin-tube type heat exchanger in which a titanium straight pipe is banded and an open tank is applied.

Images