KR20200050688A - Heat pump system with cleaning device - Google Patents

Abstract

The present invention discloses a heat pump system with a cleaning device. The present invention is configured to automatically clean the evaporative heat exchanger after terminating a heating or cooling operation when reaching a set cleaning time during the heating or cooling operation. Accordingly, it is possible to increase the heat exchange efficiency of the evaporative heat exchanger and increase the production efficiency of high temperature water by effectively removing the seawater remaining in the evaporative heat exchanger using the seawater as a heat source, and it is also possible to stably operate the heat pump system while preventing an excessive operation of a compressor.

Description

Heat pump system with cleaning device

The present invention relates to a heat pump system that uses sea water as a heat source, and more specifically, a cleaning device that automatically cleans an evaporative heat exchanger using sea water as a heat source in a heat pump system for a predetermined time at a specified time. It relates to a heat pump system having a.

As an energy source for cooling / heating, which is one of the important elements for making residential life comfortable, the development of alternative energy in place of fossil fuels is actively progressing, and among these alternative energy, a driving method that can be used directly for cooling / heating Depending on the type of electric, engine, and heat sources, there are two types of heat pump systems: air heat source type, hydrothermal source type (waste heat source type), geothermal source type, etc., depending on the heat supply method, warm air type, cold air type, hot water type, cold water type And heating, cooling, dehumidifying, and cooling / heating combinations.

The heat pump system is a structure composed of a compressor, an evaporator, a condenser, an expansion valve, and the like, and most of the heat pump systems currently have a structure that combines cooling and heating. Among these heat pump systems, the hydrothermal source heat pump system is seawater. Is used as a heat source.

However, in the conventional heat source heat pump system using sea water as a heat source, since the evaporation heat exchanger using sea water as a heat source is not properly cleaned, corrosion occurs due to sea water remaining inside the evaporation heat exchanger. As it was, there was a problem that the heat exchange efficiency is reduced during cooling and heating operations.

Registered Utility Model Publication No. 20-0351554 (announcement date 2004.05.24.) Publication Patent Publication No. 2004-0049212 (Publication Date 2004.06.11.) Published Patent Publication No. 2004-0087670 (published 2004.10.15.) Registered Patent Publication No. 10-531113 (Publication date 2005.11.25) Registered Patent Publication No. 10-0531653 (Publication date 2005.11.29.) Registered Patent Publication No. 10-0639104 (Announcement date 2006.10.27)

The problem to be solved by the present invention is to configure the washing or the evaporation heat exchanger to be automatically cleaned after the heating or cooling operation is completed when the washing set time is reached in the state of heating operation or cooling operation, and seawater is used as a heat source. The purpose of the present invention is to provide a heat pump system having a cleaning device that removes the seawater remaining inside the evaporative heat exchanger to be used and improves the heat exchange efficiency using the seawater heat source during cooling and heating operations.

The heat pump system provided with a cleaning device, which is a solution to the problems of the present invention, circulates a low-stage refrigerant that is heat-exchanged by using seawater flowing through a seawater circulation line of intake and outflow as a heat source according to a cooling operation mode or a heating operation mode, A first refrigerant circulation system unit including a first compressor, a first oil separator, a 4-WAY valve, a first receiver, a first expansion valve, an evaporative heat exchanger, and a first liquid separator; In the heating operation mode, by circulating a high-stage refrigerant to heat the water flowing through the water circulation line of intake and outgoing with hot water, a second compressor, a second oil separator, a condensation heat exchanger, a second fluid receiver, and a second expansion valve , A second refrigerant circulation system including a second liquid separator; A cascade heat exchanger that connects the first and second refrigerant circulation systems to heat the high-stage refrigerant by using a low-stage refrigerant flowing through the first refrigerant circulation system as a heat source in a heating operation mode; Including, in the sea water circulation line of the incoming and outgoing water which is connected to the evaporative heat exchanger, a cleaning device operated by a controller to clean the evaporative heat exchanger and the seawater circulation line using a cleaning solution according to a set time is obtained and the washing of the outgoing water It is connected by lines.

In addition, the cleaning device is operated in a predetermined time according to the control signal of the controller in the cooling operation mode or the heating operation mode, the cleaning tank is stored cleaning liquid; And a washing pump connected to the washing line of water and pumping and circulating the washing liquid stored in the washing tank. It is to include.

In addition, the said cleaning liquid contains water, citric acid, and baking soda.

In addition, the cascade heat exchanger is a six-diameter heat exchanger having three inlets and three outlets, and the water circulation line of the inlet and outlet connected to the cascade heat exchanger is branched to the water circulation line of inlet and outlet, Each of the water supply line of the water supply line of the incoming and outgoing is connected to the heating medium supply line, and the heating medium supply line is in accordance with the control signal of the controller to circulate the heat medium for heat exchange of the low-stage refrigerant or the high-stage refrigerant passing through the cascade heat exchanger It is to connect the working heat medium supply.

In addition, the heating medium supply unit, a heat source tank for heating and supplying a heating medium by embedding a heater; And a second heat source pump which is connected to the heat medium supply line of water and pumps and circulates a heat medium heated from the heat source tank. It is to include.

In addition, a first 3-WAY valve for changing the water flow to the condensation heat exchanger or the cascade heat exchanger under the control of the controller at the water circulation line of the inlet to which the water pump is connected and the water branch line of the inlet to which the water pump is connected. The second 3-way valve is connected to the water circulation line of the outgoing water and the branching point of the water branching line of the outgoing water to change the water flow to the water or heat source tank under the control of the controller.

In addition, at the branch point of the seawater circulation line of the inlet to which the heat source pump is connected and the washing line of the inlet, a direction change is performed to discharge seawater under the control of the controller or to return circulation of the cleaning liquid to the cleaning tank. Connect a 3-WAY valve, and obtain the seawater through the evaporation heat exchanger under the control of the controller at the branch point of the seawater circulation line of the outflow water and the washing line of the outflow water, or obtain the cleaning liquid in the cleaning tank through the evaporation heat exchanger. This is to connect the fourth 3-way valve that is turned to the right side.

In addition, when the inlet temperature and the outlet temperature of the low-stage refrigerant passing through the evaporation heat exchanger reach a set reference temperature, the first compressor is stopped by the controller, and the second compressor is stopped from operating the first compressor. At the same time it is configured to operate by the controller.

In addition, in the inlet and outlet means of the evaporative heat exchanger, a temperature sensor is formed to measure the inlet temperature and the outlet temperature of the low stage refrigerant, and the controller has the inlet temperature and the outlet temperature of the low stage refrigerant measured by the temperature sensor. The first compressor is operated and controlled until the set reference temperature is reached, and when the inlet temperature and the outlet temperature of the low stage refrigerant reach the set reference temperature, the operation of the first compressor is stopped and the second compressor is operated. It is equipped with a driving control program.

In addition, the 4-WAY valve is switched to the opening direction from the control signal of the controller according to the heating operation mode or the cooling operation mode, and in the cooling operation mode according to the switching direction of the opening of the 4-WAY valve, the first refrigerant circulation The low-stage refrigerant in the system unit passes through a first compressor, a first oil separator, a 4-WAY valve, an evaporative heat exchanger, a first fluid receiver, a first expansion valve, a cascade heat exchanger, and a first liquid separator in sequence. The circulation process that flows back to the first compressor is repeated, and in the heating operation mode according to the opening direction change of the 4-WAY valve, the low-stage refrigerant in the first refrigerant circulation system unit is the first compressor, the first oil separator, After the 4-WAY valve, the cascade heat exchanger, the first fluid receiver, the first expansion valve, the evaporative heat exchanger, and the first liquid separator are sequentially passed, the circulation process flowing back to the first compressor is repeated.

In addition, the first refrigerant circulation system unit is connected to the first solenoid valve that is opened and closed in the cooling operation mode according to the control signal of the controller, and in the heating operation mode, the opening and closing control is sequentially connected, the second refrigerant The second solenoid valve connected to the circulation system part is closed in the cooling operation mode and opened in the heating operation mode according to the control signal of the controller.

As described above, the present invention is configured to automatically clean the evaporative heat exchanger after the cooling / heating operation is terminated when the cleaning set time is reached in a heating operation or a cooling operation, and seawater is used as a heat source. Through the effective removal of seawater remaining in the evaporative heat exchanger, it is possible to increase the heat exchange efficiency of the evaporative heat exchanger, increase the production efficiency of hot water, and prevent the excessive operation of the compressor while stably operating the heat pump system. will be.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a system diagram showing a state in which the heat pump system provided with a cleaning device operates in a cooling operation mode as an embodiment of the present invention.
Figure 2 is a system diagram showing a state in which the heat pump system equipped with a cleaning device to operate in a heating operation mode using sea water as an embodiment of the present invention.
Figure 3 is a system diagram showing a state in which the heat pump system having a cleaning device in an embodiment of the present invention operates in the cleaning mode.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, in the embodiments of the technical idea of the present invention, the present invention is not limited to the embodiments disclosed below, and may be implemented in various different forms, and only the present embodiments make the disclosure of the present invention complete, and the technology to which the present invention pertains It is provided to fully inform the person of ordinary skill in the field of the scope of the invention, and is only defined by the scope of the claims in the embodiments of the technical idea of the present invention.

The terminology used herein is for describing the embodiments and is not intended to limit the present invention. In the present specification, the singular form also includes the plural form unless otherwise specified in the phrase.

In this specification, terms such as “include” or “have” are intended to indicate that there are features, numbers, steps, operations, elements, parts, or combinations thereof described in the specification, and one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, actions, components, parts or combinations thereof are not excluded in advance.

In addition, embodiments described herein will be described with reference to cross-sectional views and / or plan views, which are ideal exemplary views of the present invention. Accordingly, the embodiments of the present invention are not limited to the specific shapes shown, but also include changes in necessary shapes. For example, the area illustrated at a right angle may be rounded or may have a shape having a predetermined curvature. Accordingly, the regions illustrated in the figures have schematic properties, and the shape of the regions illustrated in the figures is intended to illustrate a particular form of region of the device and is not intended to limit the scope of the invention.

The same reference numerals throughout the specification refer to the same components. Accordingly, the same reference numerals or similar reference numerals may be described with reference to other drawings even though they are not mentioned or described in the corresponding drawings. Further, even if reference numerals are not indicated, they may be described with reference to other drawings.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a system diagram showing a state in which the heat pump system equipped with a cleaning device operates in a cooling operation mode as an embodiment of the present invention, and FIG. 2 is a heat pump system equipped with a cleaning device according to an embodiment of the present invention. It is a system diagram showing a state of operating in a heating operation mode by using, and FIG. 3 is a system diagram showing a state of a heat pump system having a cleaning device operating in a cleaning mode as an embodiment of the present invention.

Referring to the attached Figures 1 to 3, the heat pump system having a cleaning device according to an embodiment of the present invention, the first refrigerant circulation system unit 10, the second refrigerant circulation system unit 20, cascade ( cascade) to include a heat exchanger 30, a controller 40, and a cleaning device 50.

The first refrigerant circulation system unit 10 operates in a cooling operation mode or transfers condensation heat of a low-stage refrigerant that is exchanged by using sea water (or heat medium) as a heat source during the heating operation mode to the second refrigerant circulation system unit 20 By doing so, it is possible to produce high temperature water in the second refrigerant circulation system unit 20, and the first compressor 11 for compressing the low stage refrigerant at high temperature and high pressure and the oil contained in the low stage refrigerant compressed at high temperature and high pressure are separated. A first oil separator (12), a 4-WAY valve (13), a first receiver (14) for temporarily storing the liquefied high temperature and high pressure refrigerant liquid, and a first expansion valve (15) for depressurizing the low temperature refrigerant at high temperature and pressure ), An evaporative heat exchanger (16), and a first liquid separator (17) for separating the refrigerant liquid.

At this time, the 4-WAY valve 13 is the opening direction is switched from the control signal of the controller 40 according to the heating operation mode or the cooling operation mode, the opening of the 4-WAY valve 13 in the cooling operation mode As the direction is changed, the low-stage refrigerant in the first refrigerant circulation system unit 10 includes a first compressor 11 → a first oil separator 12 → a 4-WAY valve 13 → an evaporative heat exchanger 16 → First fluid receiver (14) → First expansion valve (15) → Cascade heat exchanger (30) → After passing through the first liquid separator (17) sequentially, the circulation process that flows back to the first compressor (11) Will repeat.

In addition, when the opening direction of the 4-WAY valve 13 is changed during the heating operation, the low-stage refrigerant in the first refrigerant circulation system unit 10 includes a first compressor 11 → a first oil separator 12 ) → 4-WAY valve (13) → cascade heat exchanger (30) → first receiver (14) → first expansion valve (15) → evaporative heat exchanger (16) → first liquid separator (17) sequentially After passing, the circulation process that flows back into the first compressor 11 is repeated.

The second refrigerant circulation system unit 20 circulates the high-stage refrigerant to heat the water flowing through the water circulation lines L2 and L2 'of the inlet and the outlet in the heating operation mode to high temperature water, and the second compressor 21 ), A second oil separator 22, a condensation heat exchanger 23, a second receiver 24, a second expansion valve 25, and a second liquid separator 26.

That is, when the high-stage refrigerant is heat-exchanged when the low-stage refrigerant circulated in the cascade heat exchanger 30 in the heating operation mode is used as the heat medium, the high-stage refrigerant is the second compressor 21. → second oil separator 22 → condensation heat exchanger 23 → second receiver 24 → second expansion valve 25 → cascade heat exchanger 30 after sequentially passing through the second compressor 31 It is configured to repeat the cycle of the flow back to the.

At this time, the second compressor 21 included in the second refrigerant circulation system unit 20 is stopped when the first compressor 11 is operated, and the operation of the first compressor 11 is stopped. While heating the high-stage refrigerant using the low-stage refrigerant heated as a heat source to reach a set reference temperature passing through the cascade heat exchanger 30, and passing through the condensation heat exchanger 23 using the heated high-stage refrigerant as a heat source This is to ensure that the water to be heated can be heated with hot water (eg, 70 to 80 ° C).

Here, the first compressor 11 is operated when the inlet temperature of the low-stage refrigerant obtained in the cascade heat exchanger 30 and the outlet temperature reach a set reference temperature (eg, inlet temperature 52 ° C, outlet temperature 60 ° C). It can be stopped, the operation control of the first compressor 11 and the second compressor 21 can be made by the controller 40.

That is, the cascade heat exchanger 30 is a high stage circulated in the second refrigerant circulation system unit 20 using a low stage refrigerant that is heated and circulated to reach a reference temperature in the first refrigerant circulation system unit 10 as a heat source. The refrigerant is heated, and the condensation heat exchanger 23 produces high temperature water by heating the water using the low stage refrigerant exchanged by the cascade heat exchanger 30 as a heat source (condensation heat), and the controller 40 While the reference temperature values for the inlet temperature and the outlet temperature of the low-stage refrigerant are stored, the controller 40 maintains the first compressor 11 until the inlet temperature and outlet temperature of the low-stage refrigerant reaches a set reference temperature. When the inlet temperature and the outlet temperature of the low-stage refrigerant reach the set reference temperature, the operation of the first compressor 11 is stopped and the second compressor 21 is operated. It will be placed to mount a drive control program that.

Here, the inlet temperature (eg, 52 ° C) and the outlet temperature (eg, 60 ° C) of the low stage refrigerant are measured by the temperature sensors 70 respectively installed in the refrigerant inlet and outlet means of the cascade heat exchanger 30. After that it can be provided to the controller 40.

The cascade heat exchanger 30 is to connect the first and second refrigerant circulation system parts 10 and 20, and in the heating operation mode, the low-stage refrigerant flowing through the first refrigerant circulation system part 10 as a heat source Thus, it is configured to heat the high-stage refrigerant.

At this time, the cascade heat exchanger 30 is a six-diameter heat exchanger having three inlets and three outlets, and the inlet and outlet water circulation lines L2 and L2 'are connected to the cascade heat exchanger 30 In addition, the water branch lines L21 and L21 'of water and water are branched, and the heat medium supply lines L3 and L3' of water and water are connected to the water branch lines L21 and L21 ', respectively. And, the heat medium supply line (L3, L3 ') is a heat medium that operates according to the control signal of the controller 40 to circulate the heat medium for heat exchange of the low-stage refrigerant or the high-stage refrigerant passing through the cascade heat exchanger (30) The supply unit 60 is connected.

That is, the heat medium supply unit 60 is connected to the heat source tank 61 for heating and supplying a heat medium by incorporating a heater, and connected to the heat medium supply line L3 of the intake and pumping the heat medium heated from the heat source tank 61 It includes a second heat source pump 62 to circulate.

The cleaning device 50 is connected to the inlet and outlet seawater circulation lines L1 and L1 'connected to the evaporation heat exchanger 16 to the inlet and outlet cleaning lines L11 and L11', which are set. Over time, the evaporative heat exchanger (16) and the seawater circulation lines (L1, L1 ') are operated by a controller (40) to clean using cleaning liquid.

That is, the cleaning device 50 is operated at a predetermined time according to a control signal of the controller 40 in a cooling operation mode or a heating operation mode, the cleaning tank 51 in which the cleaning liquid is stored, and the cleaning of the water It is connected to the line (L11) and includes a cleaning pump (52) for pumping and circulating the cleaning solution stored in the cleaning tank (51), wherein the cleaning solution includes water, citric acid and baking soda.

At this time, the condensation heat exchanger 23 controls the flow of water according to the control of the controller 40 at the branch of the water circulation line L2 of the inlet to which the water pump P2 is connected and the water branch line L21 of the inlet. Or the first 3-WAY valve (SV1) for changing to the cascade heat exchanger 30 is connected, as well as the water circulation line (L2 ') of the water and the water branch line (L22') of the water outlet According to the control of the controller 40, the second 3-WAY valve SV2 for changing the water flow to the outflow or heat source tank 61 is connected.

Then, the seawater circulation line (L1) of the inlet to which the heat source pump (P1) is connected and the washing line (L11) of the inlet are discharged seawater under the control of the controller (40) or the washing tank (51). ) Is connected to a third 3-WAY valve (SV3) whose direction is changed to return the cleaning liquid to return circulation, and the controller is connected to the seawater circulation line (L1 ') of the outflow water and the washing line (L11') of the outflow water. In accordance with the control of (40), the seawater is obtained through the evaporation heat exchanger 16 or the fourth 3-way direction change is made to obtain the cleaning liquid in the cleaning tank 51 to the evaporation heat exchanger 16. WAY valve (SV4) is connected.

On the other hand, the first refrigerant circulation system unit 10 is the first solenoid valve (V1) is opened and closed in the cooling operation mode in accordance with the control signal of the controller 40, the opening and closing control is sequentially in the heating operation mode ) Is connected, the second solenoid valve (V2) is closed in the cooling operation mode and opened and controlled in the heating operation mode according to the control signal of the controller 40 to the second refrigerant circulation system unit 20. Is connected.

As described above, the heat pump system provided with the cleaning device according to the embodiment of the present invention can operate in the cooling operation mode and the heating operation mode, as shown in FIGS. 1 to 3, and the cooling operation mode or the heating operation mode. After that, it is possible to operate in the washing mode, and hereinafter, the cooling operation mode, the heating operation mode, and the washing mode will be described separately.

[Cooling operation mode]

1, the second solenoid valve V2 included in the second refrigerant circulation system unit 20 is closed and controlled according to the control signal of the controller 40 in the cooling operation mode, and the first refrigerant circulation system The first solenoid valve V1 included in the part 10 may be opened to be controlled.

Subsequently, the controller 40 drives and controls the heat source pump P1 and the water pump P2, and accordingly, the seawater obtained through the seawater circulation line L1 of water is passed through the evaporation heat exchanger 16 and then discharged. The water that is discharged to the seawater circulation line L1 'of the water and is received as the water circulation line L2 of the intake is passed through the condensation heat exchanger 23 and then to the water circulation line L2' of the water discharge.

At this time, in the cooling operation mode in which the temperature difference between the low-stage refrigerant passing through the evaporative heat exchanger 16 and the seawater is not large, the controller 40 includes a first compressor included in the first refrigerant circulation system unit 10 ( 11) On the other hand, the operation of the second compressor 21 included in the second refrigerant circulation system unit 20 is stopped.

Then, the high-temperature and high-pressure low-stage refrigerant compressed according to the operation of the first compressor 11 is the first oil separator 12 → check valve (D1) → 4-WAY valve (13) → evaporative heat exchanger (16) → The check valve (D2) → the first receiver 14 → the first expansion valve 15 is reduced in pressure, and the low-pressure refrigerant depressurized by the first expansion valve 15 is the first solenoid valve (V1) After passing through the cascade heat exchanger 30 condensing through the check valve D3, it is circulated to the first compressor 11 through the 4-WAY valve 13 and the first liquid separator 17.

At this time, the cascade heat exchanger 30 is connected to the water circulation line (L2, L2 ') of the inlet and the water from the water circulation line (L21, L21') is separated, connected, as well as the water circulation line (L2) of the water supply A first 3-WAY valve SV1 is connected to the water branch line L21 branch of the water, and a second 3-WAY valve SV2 is connected to the water separation line L21 'of the water outlet. , The first 3-WAY valve (SV1) is opened in a direction to connect the water circulation line (L2) and the cascade heat exchanger (30) of the inlet under the control of the controller 40, the second The 3-WAY valve SV2 may be opened in a direction connecting the water circulation line L2 'of the water outlet and the cascade heat exchanger 30 under the control of the controller 40.

 Then, the water pumped by the water pump (P2) is the water circulation line (L2) of the intake → water branch line (L21) of the incoming water → cascade heat exchanger (30) → water branch line (L21 ') of the water Since it has a system diagram flowing to the circulation line (L2), the water is made of cold water from the depressurized low-stage refrigerant passing through the cascade heat exchanger (30) and then discharged to the outside through the water circulation line (L2 ') of the effluent It can be.

[Cleaning mode after cooling operation mode]

As shown in the attached FIG. 3, when the water is heat-exchanged with cold water and the water extraction is completed, the washing mode time for washing the circulation lines L1 and L1 'of the seawater passing through the evaporative heat exchanger 16 is set. Therefore, the controller 40 operates the cleaning pump 52 included in the cleaning device 50 while stopping the circulation of the low-stage refrigerant by closing the first solenoid valve V1 and controlling the first solenoid valve V1. The heat source pump is controlled by closing the 3-way valves (SV1, SV2) of 1,2 to block the water circulation, and at the same time, the 3-way valves (SV3, SV4) of the 3rd and 4th openings are controlled by the cleaning liquid circulation line The operation of (P1) is stopped to prevent seawater from entering and exiting the seawater circulation lines (L1, L1 ').

Then, according to the operation of the washing pump 52, the washing liquid stored in the washing tank 51 is obtained from the washing line (L11) → the seawater circulation line (L1) of the incoming water branch point → the evaporation heat exchanger (16) → the outflow Seawater circulation line (L1 ') branch point → after being circulated along the cleaning line (L11') of the outflow, it is repeated 2 to 3 times to flow into the cleaning tank (51), and accordingly the seawater circulation line (L1, L1 '), of course, as the cleaning operation to remove seawater or foreign substances remaining in the internal piping of the evaporative heat exchanger 16 passing through the seawater is completed, the heat pumping efficiency of the evaporative heat exchanger 16 is increased to increase the heat pump system. It is possible to operate stably.

[Heating operation mode]

As shown in FIG. 2, first, the second solenoid valve V2 included in the second refrigerant circulation system unit 20 is closed and controlled according to the control signal of the controller 40 in the heating operation mode, and the first refrigerant circulation The first solenoid valve V1 included in the system unit 10 may be opened to be controlled.

Subsequently, the controller 40 drives and controls the heat source pump P1 and the water pump P2, and accordingly, the seawater obtained through the seawater circulation line L1 of water is passed through the evaporation heat exchanger 16 and then discharged. The water that is discharged to the seawater circulation line L1 'of the water and is received as the water circulation line L2 of the intake is passed through the condensation heat exchanger 23 and then to the water circulation line L2' of the water discharge.

At this time, in the heating operation mode in which the temperature difference between the low-stage refrigerant and the seawater passing through the evaporation heat exchanger 16 may be large, the controller 40 first includes the first included in the first refrigerant circulation system unit 10. While operating the compressor 11, the operation of the second compressor 21 included in the second refrigerant circulation system unit 20 is stopped.

Then, the high-temperature and high-pressure low-stage refrigerant compressed according to the operation of the first compressor 11 is the first oil separator 12 → check valve (D1) → 4-WAY valve 13 → cascade heat exchanger 30 → The check valve (D4) → the first receiver (14) → the first expansion valve (15) is depressurized, and the depressurized low-stage refrigerant passing through the first expansion valve (15) is the first solenoid valve (V1) And passing through the evaporation heat exchanger 16 while passing through the check valve D5.

At this time, the depressurized low-stage refrigerant passing through the evaporative heat exchanger (16) undergoes heat exchange using sea water as a heat source, and the low-stage refrigerant heated through heat exchange is a 4-WAY valve (13) and a first liquid separator. While passing through (17), the gaseous low-stage refrigerant flows into the first compressor (11), and the heat of the low-stage refrigerant heated by heat exchange by the seawater is repeated while repeating the cycle as described above. 30).

On the other hand, in a cycle in which repetitive circulation is performed as described above, a temperature sensor 70 is installed at the inlet and outlet means of the cascade heat exchanger 30, and the temperature sensor 70 is the cascade heat exchanger 30. After measuring the temperature of the inlet and outlet of the low stage refrigerant for the inlet and outlet of the measured information is output to the controller 40.

Then, the controller 40 determines whether the inlet and outlet temperatures of the low-stage refrigerant measured by the inlet and outlet means of the cascade heat exchanger 30 have reached a set reference temperature (eg, inlet temperature 52 ° C, outlet temperature 60 ° C). Analysis.

At this time, when the measurement temperature of the inlet end and the measurement temperature of the outlet means reach the reference temperature, the controller 40 stops the operation of the first compressor 11 and simultaneously operates the first solenoid valve V1. And the second solenoid valve V2 is opened and controlled while simultaneously operating the second compressor 21 included in the second refrigerant circulation system unit 20. The included second heat source pump 62 is operated.

Thereafter, the controller 40 is connected to the first water supply line 3 and the cascade heat exchanger 30 so that the water supply circulation line L2 and the heat medium supply line L3 of the water supply are branched. -WAY valve (SV1) is opened and controlled, while the second cascade heat exchanger (30) is connected to the outlet water heating medium supply line (L3 ') through the vessel separation line (L21') of the outlet water (SV2) is controlled to open.

Then, the high-temperature high-pressure refrigerant compressed by the second compressor 21 passes through the second oil separator 22 → the check valve D6 → the condensation heat exchanger 23, and then the second receiver 24 And the second expansion valve 25, the pressure is reduced while passing through the second solenoid valve V2 while flowing into the cascade heat exchanger 30, while the heat source tank 61 included in the heat medium supply part 60 The heating medium heated from is introduced into the cascade heat exchanger 30 through the heating medium supply line (L3) → check valve (D7) → water circulation line (L21) from the pumping operation of the second heat source pump (62).

At this time, the cascade heat exchanger 30 has a low-stage refrigerant that has reached a reference temperature (eg, an inlet temperature of 52 ° C, an outlet temperature of 60 ° C) passing through it, and thus is supplied from the low-stage refrigerant and / or the heat medium supply unit 60 The heat exchanger in which the heat exchanger is heated is made by using the heat medium as a heat source, and the heat exchanger heat exchanger flows into the second compressor 21 through the second liquid separator 26.

On the other hand, the low temperature refrigerant and / or the high temperature refrigerant heated using the heat medium as a heat source having reached the reference temperature (eg, inlet temperature 52 ° C., water outlet temperature 60 ° C.) is compressed at high temperature and high pressure in the second compressor 21 again. When passing through the condensation heat exchanger 23, the water pumped by the water pump P2 using the heated high-stage refrigerant passing through the condensation heat exchanger 23 as a heat source passes through the condensation heat exchanger 23 As it is heated, the target high temperature water (eg, 70 to 80 ° C) can be easily produced in the heat pump system without excessive operation of the first compressor 11 or the second compressor 21.

[Cleaning mode after heating operation mode]

As shown in the attached FIG. 3, when the water is heated with high temperature water and the outflow is completed, the washing mode time for washing the circulation lines L1 and L1 'of the seawater passing through the evaporation heat exchanger 16 is set. Therefore, the controller 40 operates the cleaning pump 52 included in the cleaning device 50 while stopping the high-stage refrigerant circulation by closing the second solenoid valve V2 and controlling the second solenoid valve V2. The heat source pump is controlled by closing the 3-way valves (SV1, SV2) of 1,2 to block the water circulation, and at the same time, the 3-way valves (SV3, SV4) of the 3rd and 4th openings are controlled by the cleaning liquid circulation line The operation of (P1) is stopped to prevent seawater from entering and exiting the seawater circulation lines (L1, L1 ').

Then, according to the operation of the washing pump 52, the washing liquid stored in the washing tank 51 is obtained from the washing line (L11) → the seawater circulation line (L1) of the incoming water branch point → the evaporation heat exchanger (16) → the outflow Seawater circulation line (L1 ') branch point → after being circulated along the cleaning line (L11') of the outflow, it is repeated 2 to 3 times to flow into the cleaning tank (51), and accordingly the seawater circulation line (L1, L1 '), of course, as the cleaning operation to remove seawater or foreign substances remaining in the internal piping of the evaporative heat exchanger 16 passing through the seawater is completed, the heat pumping efficiency of the evaporative heat exchanger 16 is increased to increase the heat pump system. It is possible to operate stably.

In the above, the technical idea of the heat pump system equipped with the cleaning device of the present invention has been described with reference to the accompanying drawings, but this is merely illustrative of the best embodiment of the present invention, and does not limit the present invention.

Accordingly, the present invention is not limited to the specific preferred embodiments described above, and various modifications can be practiced by anyone who has ordinary skill in the art to which the invention pertains without departing from the gist of the invention as claimed in the claims. Needless to say, such changes are within the scope of the claims.

10; A first refrigerant circulation system part 11; 1st compressor
12; First oil separator 13; 4-WAY valve
14; First receiver 15; 1st expansion valve
16; Evaporative heat exchanger 17; 1st liquid separator
20; A second refrigerant circulation system part 21; 2nd compressor
22; A second oil separator 23; Condensation heat exchanger
24; A second receiver 25; 2nd expansion valve
26; A second liquid separator 30; Cascade heat exchanger
40; Controller 50; Cleaning device
51; Cleaning tank 52; Cleaning pump
60; Heat medium supply part 61; Heat source tank
62; A second heat source pump 70; temperature Senser
P1; Heat source pump P2; Water pump
D1 to D7; Check valves SV1, SV2, SV3, SV4; 3-WAY valve
V1, V2; Solenoid valve

Claims (11)

According to the cooling operation mode or the heating operation mode, by circulating a low-stage refrigerant exchanged by using the seawater flowing through the seawater circulation line of intake and outflow as a heat source, the first compressor, the first oil separator, the 4-way valve, and the first fluid A first refrigerant circulation system including a gas, a first expansion valve, an evaporative heat exchanger, and a first liquid separator;
In the heating operation mode, by circulating a high-stage refrigerant to heat the water flowing through the water circulation line of intake and outgoing with hot water, a second compressor, a second oil separator, a condensation heat exchanger, a second fluid receiver, and a second expansion valve , A second refrigerant circulation system including a second liquid separator;
A cascade heat exchanger that connects the first and second refrigerant circulation systems to heat the high-stage refrigerant by using a low-stage refrigerant flowing through the first refrigerant circulation system as a heat source in a heating operation mode; Including,
In the seawater circulation line of the inlet and outlet water connected to the evaporative heat exchanger, a cleaning device operated by a controller to clean the evaporative heat exchanger and the seawater circulation line using a cleaning liquid according to a set time is connected to the inlet and outlet cleaning line. Heat pump system with a cleaning device, characterized in that. According to claim 1,
The cleaning device operates in a predetermined time according to a control signal of the controller in a cooling operation mode or a heating operation mode,
A cleaning tank in which cleaning liquid is stored; And a washing pump connected to the washing line of water and pumping and circulating the washing liquid stored in the washing tank. Heat pump system having a cleaning device, characterized in that it comprises a. According to claim 2,
The cleaning solution is a heat pump system with a cleaning device, characterized in that it comprises water and citric acid and baking soda. According to claim 1,
The cascade heat exchanger is a six-diameter heat exchanger having three inlets and three outlets, and the water circulation line of the inlet and outlet connected to the cascade heat exchanger is branched to the water circulation line of inlet and outlet,
Control of the controller to circulate a heat medium for heat exchange of a low-stage refrigerant or a high-stage refrigerant passing through the cascade heat exchanger to connect the heat medium supply line of the inlet and the water to the water branch line of the inlet and the outlet, respectively. Heat pump system with a cleaning device, characterized in that for connecting the heating medium supply unit operating in accordance with the signal. The method of claim 4,
The heating medium supply unit,
A heat source tank incorporating a heater to heat and supply the heating medium; And a second heat source pump which is connected to the heat medium supply line of water and pumps and circulates a heat medium heated from the heat source tank. Heat pump system having a cleaning device, characterized in that it comprises a. The method of claim 5,
A first 3-WAY valve for changing the water flow to the condensation heat exchanger or the cascade heat exchanger under the control of the controller is connected to the water circulation line of the inlet to which the water pump is connected and the water branch line of the inlet to which the water pump is connected, ,
Equipped with a cleaning device, characterized in that a second 3-way valve is connected to the water circulation line of the outflow and the water branch line of the outflow to change the water flow to the outflow or heat source tank under the control of the controller. Heat pump system. The method of claim 6,
A third 3-WAY valve that is diverted to the seawater circulation line of the inlet to which the heat source pump is connected and the washing line branch of the inlet to discharge seawater under the control of the controller or to return circulation of the cleaning liquid to the cleaning tank. Connect it,
A fourth third that is diverted to the seawater circulation line of the outflow water and the washing line branch of the outflow water to obtain the seawater through the evaporative heat exchanger under the control of the controller or to obtain the cleaning liquid in the cleaning tank into the evaporative heat exchanger. -A heat pump system with a cleaning device characterized by connecting a WAY valve. According to claim 1,
The first compressor is stopped by the controller when the inlet temperature and the outlet temperature of the low stage refrigerant passing through the evaporation heat exchanger reach a set reference temperature,
The second compressor is a heat pump system having a cleaning device, characterized in that configured to operate by the controller at the same time the operation of the first compressor is stopped. The method of claim 8,
A temperature sensor is formed in the inlet and outlet means of the evaporative heat exchanger to measure the inlet and outlet temperatures of the low stage refrigerant,
The controller operates and controls the first compressor until the inlet temperature and the outlet temperature of the low stage refrigerant measured by the temperature sensor reach a set reference temperature, and the reference temperature at which the inlet temperature and outlet temperature of the low stage refrigerant is set. A heat pump system with a cleaning device, characterized in that an operation control program for stopping the operation of the first compressor and operating the second compressor is mounted upon reaching the. The method of claim 9,
In the 4-WAY valve, the opening direction is switched from the control signal of the controller according to the heating operation mode or the cooling operation mode,
In the cooling operation mode according to the change of the opening direction of the 4-WAY valve, the low-stage refrigerant in the first refrigerant circulation system part is a first compressor, a first oil separator, a 4-WAY valve, an evaporative heat exchanger, and a first receiver After repeating the first expansion valve, the cascade heat exchanger, and the first liquid separator sequentially, repeat the circulation process that flows back into the first compressor,
In the heating operation mode according to the change of the opening direction of the 4-WAY valve, the low-stage refrigerant in the first refrigerant circulation system unit includes a first compressor, a first oil separator, a 4-WAY valve, a cascade heat exchanger, and a first receiver , A heat pump system having a cleaning device, characterized by repeating a circulation process that flows back into the first compressor after sequentially passing through the first expansion valve, the evaporative heat exchanger, and the first liquid separator. The method of claim 10,
A first solenoid valve is connected to the first refrigerant circulation system unit in the cooling operation mode according to the control signal of the controller, and in the heating operation mode, the opening and closing control is sequentially performed.
A heat pump system having a cleaning device, characterized in that a second solenoid valve is connected to the second refrigerant circulation system part, which is closed in the cooling operation mode and opened in the heating operation mode according to the control signal of the controller. .

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