KR20150022311A - Heat pump electricity generation system - Google Patents

Abstract

A heat pump heating and cooling system absorbing energy from air source heat, geothermal heat, waste heat, and water source heat, which are energy sources, and utilizing the absorbed energy absorbs energy from air source heat relatively very low in the cold weather to heat and discharges indoor heat to the outside without using air source heat which is plentiful in the cold weather to cool. The present invention relates to a heat pump power generation system absorbing energy from air source heat capable of securing enough heat always except for the cold weather by operating a cooling cycle to produce heat, adding a heat pump system and a Rankine cycle to evaporate a coolant of the Rankine cycle by using the produced heat, and generating electricity by operating the coolant turbine by using the pressure of the gaseous coolant. In addition, the heat pump power generation system transmits condensation heat generated during a process of condensing and liquefying the coolant for a phase transition of the coolant in a coolant turbine power generation cycle to the heat source of the heat pump system to make the heat pump system absorb without transmitting the heat to the air or cooling the heat by using cooling water, thereby efficiently producing electricity at relatively low temperatures.

Description

[0001] Heat pump electricity generation system [0002]

The present invention relates to a heat pump power generation system, and more particularly, to a heat pump power generation system that acquires heat sources from air heat, geothermal heat, and waste heat, which are unused energy sources, Pump power generation system.

Patent No. 1249445 proposes a household cogeneration technology in which a refrigerant is heated by a boiler and the refrigerant is turned by the refrigerant vapor pressure in the home cogeneration system, .

Patent No. 0960609 (entitled "Refrigerant Turbine Generator") is a refrigerant turbine power generator that generates electricity by receiving energy from waste heat at a low temperature. The type of refrigerant that can be vaporized according to the temperature of low temperature waste heat, There has been proposed a turbine generator device technique in which the pressure of the liquid refrigerant flowing into the carburetor is increased by increasing the pressure of the liquid refrigerant depending on the temperature of the carburetor, Pressure liquid refrigerant that is pressurized by a pressurizing pump that is supplied to the vaporizer by supplying waste heat thereto is required to be a high-pressure gas refrigerant. In order to condense the low-pressure gas refrigerant through the refrigerant turbine into liquid refrigerant, The refrigerant is discharged to the atmosphere, or the refrigerant is condensed through the cooling water, It must discharge the cooling water heated by the heat storage portion that has absorbed heat from the waste heat is returned to the power generation turbine refrigerant but there is a problem that discard the remaining columns. Generally, if the refrigerant turbine efficiency is 40%, 60% of the heat is discarded.

In patent No. 1166154 (entitled "Binary Refrigeration Cycle Heat Pump Using Refrigerant Turbine Generator"), refrigerant compression power is applied in a reverse order Rankine cycle in a conventional heat pump to cause state displacement of the refrigerant and heat the evaporation heat for cooling, The present invention proposes a technique for producing electricity by utilizing the kinetic energy of the fluid refrigerant flowing in the piping during the operation of the heat pump. However, this is a method for increasing the efficiency and performance of the heat source acquisition unit, There is no proposal for a power generation technology that converts all the heat generated by the pump operation into electricity.

New and renewable energy sources that can generate electricity include solar power using solar power, wind power using wind power, and small hydro power using water flow or drift. In the case of photovoltaic power generation and wind power generation, however, (ESS) that can save electricity, and the period of time when the investment cost is recovered due to the low commercial value due to the high price of the power generation. It is very long.

On the other hand, in general, air-conditioner heat pump heating and cooling system must absorb heat from cold air and heat it. In contrast to a heat source rich in heat, it is necessary to cool the room by discharging the heat into the air.

A heat pump power generation system technology capable of producing electricity by absorbing a rich heat source by operating the air heat pump in a heating mode in a heat source rich in heat source is demanded by utilizing the ironic problem of the air heat pump system.

Basically, the heat pump cooling and heating system is composed of a single cycle of repeating compression - condensation - expansion - evaporation. In this case, the production temperature is about 55 ~ 60 ℃.

In order to obtain a higher outlet temperature, it is possible to obtain a high outlet temperature of about 90 ° C. by compressing the refrigerant at a high pressure by using two compressors in parallel, or by using a refrigerant such as CO 2 and using a high- In order to operate the heat pump system at high pressure, all related parts must use high voltage parts, which can lead to problems such as a rise in power generation system cost and an increase in AS cost.

Patent No. 1249445 (entitled " Household cogeneration system " Patent No. 0960609 (entitled Refrigerant Turbine Generator) Patent No. 1166154 entitled " Binary Refrigeration Cycle Heat Pump Using Refrigerant Turbine Generator "

An object of the present invention is to solve the above problems, and an object of the present invention is to provide an air heat source capable of obtaining a heat source from air heat, ground heat, There is provided a heat pump power generation system capable of generating electricity by further including a power generation cycle for converting high temperature coolant heat into electricity instead of a heat storage tank for producing hot water and capable of producing electricity with high efficiency even under low outside temperature conditions The purpose.

In order to achieve the above object, the present invention provides a heat pump power generation system comprising a heat recovery cycle (300) constituting a closed circuit by a second compressor (301), a second heat exchanger (203) A high temperature transfer cycle 200 constituting a closed loop by the first compressor 201, the first heat exchanger 104, the first expansion valve 202 and the second heat exchanger 203, The heat acquisition cycle 300 is constructed in accordance with the heat source selected by the heat generation unit 320 and the heat acquisition cycle 300 and the high temperature transfer cycle 200 are connected to the second heat exchanger 203 to constitute a two- A heat pump system for supplying heat; And a closed circuit is constituted by the first heat exchanger 104, the refrigerant turbine 101, the condenser 110 and the refrigerant pump 103 which are connected to the generator 102 via the rotary shaft and are connected to the first heat exchanger 104 And a Rankine cycle 100 that receives a heat source from the high temperature transfer cycle 200 and generates electricity by receiving cold air from the heat source acquisition unit 320 of the heat acquisition cycle 300. [ Thereby providing a heat pump power generation system.

Preferably, the heat source acquisition unit 320 includes an outside air evaporator 321 and a second expansion valve 322. The second compressor 301, the second heat exchanger 203, the second expansion valve 322), and a heat acquisition cycle (300) for constructing a closed loop by the outside air evaporator (321) to obtain a heat source from the air.

Preferably, the outdoor air evaporator may utilize the heat of condensation of the condenser 110 of the Rankine cycle 100 as a heat source at the same time as the air heat source.

Preferably, the outside air evaporator is connected to the heating medium flowing through the circulation conduit connected to the condenser 110 of the Rankine cycle 100 and the refrigerant of the heat acquisition cycle 300, And the heat exchanger for the heating medium flowing through the circulation conduit may be configured to share a cooling fin for absorbing the air heat source.

The outdoor air evaporator is connected to the heat exchanger for the refrigerant of the Rankine cycle 100 and the heat recovery cycle 300 for the heat exchange between the refrigerant of the Rankine cycle 100 and the refrigerant of the heat recovery cycle 300, The heat exchanger for the coolant of the heat exchanger may be configured to share a cooling fin for absorbing the air heat source.

Preferably, the heat source acquisition section 320 includes a heat exchanger 321 "and a second expansion valve 322, and the second compressor 301, the second heat exchanger 203, the second expansion valve The geothermal circulation pump 325 ", the geothermal heat exchanger 326", and the condenser 110 of the Rankine cycle 100 constitute a closed loop by the heat exchanger 321 'and the heat exchanger 321' ), So that the geothermal circulation loop and the heat of condensation of the Rankine cycle 100 can be utilized as a heat source at the same time.

Preferably, the heat source acquisition unit 320 is connected in parallel with a heat source or the like in the air heat source so that the heat acquisition cycle 300 can be selected by the solenoid valve control to operate the heat pump system with various heat sources .

Preferably, the heat source is selected according to the outside temperature condition and the heat source condition, and the heat pump system can be operated in the most optimal state to produce electricity.

The heat medium circulation conduit connected to the condenser 110 of the Rankine cycle 100 may be connected to the heat source acquisition unit 320 and the selected heat source It is possible to automatically make the circulation loop by the three-way valve control.

According to the heat pump power generation system of the present invention having the above configuration, there are various restrictions on the production of electricity by the weather conditions such as solar power generation, wind power generation, and small hydro power generation. The heat pump power generation system, which is capable of producing electricity by absorbing heat from an abundant source of air heat source by applying a heat pump system with a relatively low equipment cost, Especially, by absorbing air heat source which is full of heat, it is possible to produce electricity by lowering the ambient temperature by reducing the heat island phenomenon and by building units and housing units, it can self-supply energy as a small- It will be effective to prevent global climate change.

1 is a view of an air heat source heat pump power generation system according to an embodiment of the present invention,
2 is a view showing another embodiment of an air heat source heat pump power generation system according to an embodiment of the present invention,
3 is a view of a geothermal source heat pump power generation system according to an embodiment of the present invention,
4 is a diagram of a combined heat source heat pump power generation system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be described in detail in order to facilitate a person skilled in the art to which the present invention belongs. And does not mean that the technical idea and scope of the present invention are limited.

In the embodiment of the present invention, a heat acquisition cycle 300 is constituted by a heat source acquisition unit 320 that can utilize a heat source such as a geothermal source or a waste heat source selectively in order to stably produce electricity not only in the air heat source but also in a cold season, By connecting the high temperature transfer cycle 200 to the heat exchanger 203 for absorbing the heat acquired from the acquisition cycle 300 to produce higher heat, the heat acquisition cycle 300 operates as a condenser and the high temperature transfer cycle 200 operate as an evaporator to transfer the heat of the heat acquisition cycle 300 to the hot transfer cycle 200 and to compress the refrigerant in the hot transfer cycle 200 to the first compressor 201, The high-temperature hot water can be stably produced by the two-cycle heat pump system which generates the high-temperature and high-temperature refrigerant gas at a relatively low pressure.

And connecting the Rankine cycle 100, which can produce electricity to a two-cycle heat pump system comprised of the heat acquisition cycle 300 and the high temperature transfer cycle 200, through a heat exchanger 104, The heat can be supplied from the high temperature and high pressure refrigerant at 70 to 80 ° C to produce electricity.

In this case, the refrigerant in the Rankine cycle (100) needs to use a refrigerant having a low boiling point since the heat that can be supplied from the high temperature transfer cycle (200) is about 70 to 80 ° C. The low temperature boiling point refrigerant that easily changes state from liquid to gas at low temperature is R141b (boiling point about 32 ℃), R123 (boiling point about 28 ℃), R245fa (boiling point is 15 ℃), R245ca It is known. In the embodiment of the present invention, the low temperature boiling point refrigerant can be used as a working fluid.

Generally, it is known that the efficiency of generating electricity by turning the generator 102 by the refrigerant turbine 101 is 40%. Therefore, only 40% of the amount of heat supplied to the high-temperature transfer cycle 200 is converted into electricity, and the remaining refrigerant is converted from the gas refrigerant of high pressure and high temperature to the gas refrigerant of low pressure and high temperature through the refrigerant turbine 101 into the condenser 110 The heat generated by the phase change is usually converted into air or cooling water, and the remaining 60% of the heat source is lost.

In the embodiment of the present invention, the condenser 110 of the Rankine cycle 100 and the heat source acquisition unit 320 of the heat acquisition cycle 300 are connected by the feedback circulation conduit 112, The cooling medium of the feedback circulation conduit 112 is cooled by causing the acquisition unit 320 to absorb the refrigerant together with the other heat source through the evaporation of the refrigerant in the heat acquisition cycle 300, 110 so as to absorb the heat of condensation so that the energy remaining after subtracting the energy consumed in turning the refrigerant turbine 101 is recovered again in the heat acquisition cycle 300, It is possible to prevent the freezing of the outside air evaporator 321 due to the low temperature condition due to the cold weather and to operate the heat pump power generation system even in a relatively low outside temperature condition, It can help produce.

1 is a diagram of an air heat source heat pump power generation system according to an embodiment of the present invention.

As shown in FIG. 1, in the case of a general heat pump system, the heat pump power generation system according to the embodiment of the present invention is composed of a single cycle in which the compression-condensation-expansion-evaporation cycle is repeated, The Rankine cycle 100 is applied to a two-cycle heat pump system composed of a heat acquisition cycle 300 and a high-temperature transfer cycle 200, while an outgoing water temperature that can be produced is about 55 to 60 ° C, To produce electricity by three cycles.

The heat acquisition cycle 300 constitutes a closed circuit by the second compressor 301, the second heat exchanger 203, the second expansion valve 322, the outside air evaporator 321 and the liquid separator 302.

The high temperature transfer cycle 200 constitutes a closed circuit by the first compressor 201, the first heat exchanger 104, the first expansion valve 202 and the second heat exchanger 203.

The heat acquisition cycle 300 and the high temperature transfer cycle 200 are connected to a second heat exchanger 203 and the second heat exchanger operates as a condenser in the heat acquisition cycle 300 and in the high temperature transfer cycle 200, To deliver the heat source.

The Rankine cycle 100 constitutes a closed circuit with the first heat exchanger 104, the refrigerant turbine 101 connected to the rotating shaft of the generator 102, the condenser 101 and the refrigerant pump 103, It is possible to generate electricity by receiving the heat of condensation at about 70 to 90 ° C of the first heat exchanger 104 serving as a condenser.

The refrigerant of the Rankine cycle 100 is supplied with a heat source from a low-temperature heat source (70 to 90 ° C) to produce high-pressure steam and uses a refrigerant having a low boiling point to rotate the refrigerant turbine 101.

The high pressure gas refrigerant in the Rankine cycle 100 turns into a low pressure once the refrigerant turbine 100 is turned, and uses the condenser 110 to phase-convert the low pressure gas refrigerant into the liquid refrigerant.

The other side of the condenser 110 of the Rankine cycle 100 is connected to the outside air evaporator 321 of the heat recovery cycle 300, As the condenser 110 is cooled by the heating medium cooled through the evaporator 321, the low-pressure and high-temperature gas refrigerant in the Rankine cycle 100 is changed into a low-temperature and low-temperature liquid refrigerant. At this time, the heating medium of the circulation conduit is heated during the cooling process in the condenser 110. Condensation heat is transferred to the outside air evaporator 321 through the heating medium and absorbed together with the air heat source, so that the evaporation absorption calorie of the refrigerant in the heat- So that the efficiency can be increased.

2 is a view showing another embodiment of an air heat source heat pump power generation system according to an embodiment of the present invention.

The air heat source heat pump power generation system according to an embodiment of the present invention includes a condenser 110 of Rankine cycle 100 and an outside air evaporator 321 "of a heat acquisition cycle 300 of an air heat source two- The refrigerant in the Rankine cycle 100 and the refrigerant in the heat recovery cycle 300 are directly subjected to heat exchange inside the outside air evaporator 321 ", as opposed to heat exchange through the heating medium through the circulating conduit And the outside air evaporator 321 " operates as an evaporator that absorbs the air heat source and the heat of condensation of the refrigerant in the Rankine cycle 100 in the heat acquisition cycle 300. In the Rankine cycle 100, Acquisition cycle 300 is cooled from refrigerant and air to serve as a condenser.

3 is a diagram of a geothermal source heat pump power generation system according to an embodiment of the present invention.

The geothermal source heat pump power generation system according to the embodiment of the present invention is characterized in that in the two-cycle heat pump system, the heat source acquisition unit 320 is connected to the third heat exchanger 323 ", the geothermal circulation pump 325 ", the geothermal heat exchanger 326 Quot;), and a heat acquisition cycle 300 for constituting a closed circuit by the condenser 110 of the Rankine cycle 100 and utilizing the heat of condensation of the geothermal heat and the Rankine cycle as a heat source.

The geothermal heat exchanger 326 "is a low-temperature heat source that is influenced by the season rather than a geothermal heat obtained by embedding a heat-exchange pipe into a deep stratum by laying a layer on a lower surface using a capillary, Can be produced.

4 is a diagram of a combined heat source heat pump power generation system according to an embodiment of the present invention.

In the case of an air heat source heat pump power generation system according to an embodiment of the present invention, the outside temperature of the cold air is too low to generate electricity, which may result in inefficiency of power generation. And a waste heat source to utilize a complex heat source capable of generating electricity by continuously operating a generator even in a cold season.

The air heat source of the heat source acquisition unit 320 of the heat acquisition cycle 300 and the geothermal source / waste heat source can be selectively operated using a solenoid valve according to the ambient temperature condition and the underground heat source condition.

The second compressor 301, the second heat exchanger 203, the second expansion valve 322, the outside air evaporator 321, the liquid separator 302, and the solenoid valves 303 and 305 are turned on and the solenoid valves 304 and 306 are turned off, And the heat source acquisition unit 320 selects the air heat source as the heat source of the heat acquisition cycle 300. [

When the solenoid valves 303 and 305 are turned OFF and the solenoid valves 304 and 306 are turned ON, the heat source acquisition unit 320 selects the geothermal heat and the waste heat heat as the heat sources, and the second compressor 301, the second heat exchanger 203, A geothermal heat source and a waste heat source are selected as a heat source of the heat acquisition cycle 300 and operated as a geothermal and waste heat source heat pump power generation system do.

Three-way valves 114 and 115 connected to the feedback circulation conduit 112 send the heat of the heating medium (antifreeze) of the feedback circulation conduit 112 to the outside air evaporator 321 when the heat source acquisition unit 320 selects an air heat source, When the geothermal and wastewater heat sources are selected, they are sent to the fourth heat exchanger 327 and absorbed in the third heat exchanger 323 together with the geothermal and wastewater heat sources.

By constructing the heat pump power generation system by combining the Rankine cycle (100) and the complex heat source heat pump system, it is possible to efficiently generate electricity by absorbing the heat source from air heat, geothermal heat,

 The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and such modifications are also included in the scope of the invention.

100: Refrigerant turbine power generation cycle 101: Refrigerant turbine
102: generator 104: first heat exchanger
110: condenser 111: heating medium (antifreeze) tank
112: feedback circulation conduit 113: compression pump
114, 115: three-phase valve 200: high temperature transfer cycle
201: first compressor 202: first expansion valve
203: second heat exchanger 300: heat recovery cycle
301: second compressor 302: liquid separator
303, 304, 305, 306: electromagnetic valve 320:
321,321 ": ambient air evaporator 322: second expansion valve
323: third heat exchanger 324: third expansion valve
325,325 ": circulation pump 327: fourth heat exchanger
330: geothermal heat exchanger 340: waste water heat exchanger

Claims (9)

In a heat pump power generation system,
A heat acquisition cycle 300 constituting a closed circuit by the second compressor 301, the second heat exchanger 203 and the heat source acquisition section 320,
A high temperature transfer cycle 200 constituting a closed loop by the first compressor 201, the first heat exchanger 104, the first expansion valve 202 and the second heat exchanger 203,
A heat acquisition cycle 300 is formed in accordance with the heat source selected by the heat source acquisition unit 320 and the heat acquisition cycle 300 and the high temperature transfer cycle 200 are connected to the second heat exchanger 203, A heat pump system configured to supply high temperature heat; And
The first heat exchanger 104 constitutes a closed circuit by the refrigerant turbine 101 connected to the generator 102 by a rotary shaft, the condenser 110 and the refrigerant pump 103, And a Rankine cycle 100 that receives a heat source from the high temperature transfer cycle 200 and generates electricity by receiving cold air from the heat source acquisition unit 320 of the heat acquisition cycle 300. [ Heat pump power generation system. The method according to claim 1,
The heat source acquisition unit 320 includes an outside air evaporator 321 and a second expansion valve 322. The second compressor 301, the second heat exchanger 203, the second expansion valve 322, And a heat acquisition cycle (300) for constructing a closed loop by the evaporator (321) to obtain a heat source from the air. The method according to claim 2,
Wherein the outdoor air evaporator utilizes the heat of condensation of the condenser (110) of the Rankine cycle (100) as a heat source at the same time as the air heat source. The method according to claim 2,
The outside air evaporator is connected to a heat exchanger for the refrigerant of the heat acquisition cycle 300 and a heat exchanger for the heat of the heat acquisition cycle 300 for heat exchange between the heat medium flowing through the circulation conduit connected to the condenser 110 of the Rankine cycle 100 and the refrigerant of the heat acquisition cycle 300, And a heat exchanger for a heating medium flowing through the circulation conduit is configured to share a cooling fin for absorbing an air heat source. The method according to claim 2,
The outside air evaporator is connected to the heat exchanger for the refrigerant of the Rankine cycle 100 and the refrigerant of the heat acquisition cycle 300 for the heat exchange between the refrigerant of the Rankine cycle 100 and the refrigerant of the heat- Wherein the heat exchanger is configured to share a cooling fin for absorbing an air heat source. The method according to claim 1,
The heat source acquisition unit 320 is composed of a heat exchanger 321 "and a second expansion valve 322. The heat source acquisition unit 320 includes a second compressor 301, a second heat exchanger 203, a second expansion valve 322, And a geothermal circulation pump 325 ", a geothermal heat exchanger 326", and a condenser 110 of a Rankine cycle 100 constitute a closed loop by means of a heat exchanger 321 ' Loop, and the heat source of the heat source is characterized by simultaneously using the heat of the geothermal heat source and the heat of condensation of the Rankine cycle (100) as a heat source. The method of claim 1,
The heat source acquisition unit 320 is connected in parallel with a heat source such as an air source in the air source and is selected by the solenoid valve control to configure the heat acquisition cycle 300 to operate the heat pump system with various heat sources Heat pump power generation system. The method of claim 7,
Wherein a heat source is selected according to the outside temperature condition and the heat source condition, and the heat pump system is operated in the most optimal state to produce electricity. The method of claim 7,
When the heat source acquisition unit 320 selects a specific heat source by the solenoid valve control, the heat medium circulation conduit connected to the condenser 110 of the Rankine cycle 100 is connected to the heat source acquisition unit 320 and the selected heat source, And a circulation loop is automatically formed by the circulation pump.

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