Dry and wet double-cold-source heat pump system

Abstract

The invention discloses a dry and wet double-cold-source heat pump system, relates to the technical field of renewable energy systems and heat pump energy supply systems, and aims to solve the problems that an existing air source heat pump is low in refrigerating efficiency in summer and frosts during heating in winter, so that the heating capacity is attenuated, the energy consumption is increased, and for the south region of China, the refrigerating period is longer than the heating period, and the energy consumption is low. The heating requirement is relatively small, the refrigeration operation time is longer, and how to improve the operation efficiency of the air source heat pump in summer becomes a problem needing to be solved. The heat exchanger is installed on the other side of the exterior of the dry heat exchanger, the dry heat exchanger and the heat exchanger are connected through a first pipeline, a throttling valve is arranged in the middle of the first pipeline, and the dry heat exchanger and the wet heat exchanger are connected through a second pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of renewable energy systems and heat pump energy supply systems, and in particular to a dry-wet dual cold source heat pump system. Background Art

[0002] The main energy consumption of common air conditioning systems is divided into three parts: one is the energy consumption of cold and heat sources; the second is the energy consumption of terminal equipment; and the third is the energy consumption of auxiliary equipment. Among them, the energy consumption of cold and heat sources usually accounts for about 50% of the total energy consumption of air conditioning systems. Therefore, for building energy conservation, seeking low-energy renewable cold and heat source systems is a key step in reducing air conditioning energy consumption and a key measure for building energy conservation.

[0003] For example, the announcement number is CN112378061B, and the name of the Chinese authorized patent is (A household temperature and humidity independent control system using a dual-cold source heat pump main unit), which includes: a water system part and a direct expansion part. The outer shell part of the integrated dual-cold source air source heat pump main unit is provided with a shell water pipe inlet and a shell water pipe outlet corresponding to the water system part. The radiation end is connected to the shell water pipe inlet through an inlet pipe. The inlet pipe is integrated with two interfaces of a three-way regulating valve. The radiation end is connected to the shell water pipe outlet through a return pipe. The return pipe is integrated with a water pump. When the water pump is working, it sends water to the radiation end. The other interface of the three-way regulating valve is connected to the front end area of ​​the return pipe relative to the inlet of the water pump.

[0004] However, the existing conventional air-conditioning and heating systems, such as chillers + boilers, water / ground source heat pumps, air source heat pumps, and absorption heat pumps, all have problems that are difficult to overcome: the air source heat pump has low cooling efficiency in summer and frost problems during heating in winter, which leads to a decrease in heating capacity and increased energy consumption. For the southern region of my country, the cooling period is longer than the heating period, the heating demand is relatively small, and the cooling operation time is longer. How to improve the summer operating efficiency of the air source heat pump has become a problem that needs to be solved. To this end, we provide a dry-wet dual cold source heat pump system. Summary of the invention

[0005] The purpose of the present invention is to provide a dry-wet dual-cold source heat pump system to solve the problems mentioned in the above background technology, such as the low cooling efficiency of the existing air source heat pump in summer and the frosting problem during heating in winter, which leads to the attenuation of heating capacity and increased energy consumption. For the southern region of my country, the cooling period is longer than the heating period, the heating demand is relatively small, and the cooling operation time is longer. How to improve the operating efficiency of the air source heat pump in summer becomes a problem that needs to be solved.

[0006] To achieve the above object, the present invention provides the following technical solution: a dry-wet dual-cold source heat pump system, comprising: a dry heat exchanger, a wet heat exchanger being arranged on one side outside the dry heat exchanger; Also includes: The heat exchanger is installed on the other side of the dry heat exchanger. The dry heat exchanger and the heat exchanger are connected through a first pipe. A throttle valve is provided at the middle position of the first pipe. The dry heat exchanger and the wet heat exchanger are connected through a second pipe.

[0007] Preferably, the first pipeline is connected to the wet heat exchanger via a third pipeline, a second stop valve is provided at a middle position of the third pipeline, and the dry heat exchanger is connected to the wet heat exchanger via a fourth pipeline.

[0008] Preferably, a third stop valve is provided at the middle position of the fourth pipeline, a first stop valve is provided on one side of the third stop valve, the first stop valve is installed at the end connected to the dry heat exchanger, and the third stop valve is installed at the end connected to the wet heat exchanger.

[0009] Preferably, a four-way reversing valve is provided on one side of the outer wall of the fourth pipe, one end of the four-way reversing valve is connected to the heat exchanger through a pipe, a compressor is provided on the other side of the outer wall of the four-way reversing valve, one side of the compressor is connected to the other side of the outer wall of the four-way reversing valve through a pipe, and the other end of the four-way reversing valve is connected to the pipe on the other side of the compressor.

[0010] Preferably, a method for using a dry-wet dual-cold source heat pump system, in a summer cooling mode, comprises the following steps: S1: When the outdoor temperature is high, open the first stop valve, close the second stop valve and the third stop valve, and the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the dry heat exchanger through the four-way reversing valve and the first stop valve, releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the throttle valve to become a gas-liquid mixed state and then enters the heat exchanger. The refrigerant fully absorbs heat in the heat exchanger and evaporates into gas before being discharged, and then returns to the compressor through the four-way reversing valve and the pipeline, completing the refrigeration cycle; S2: When the outdoor temperature is low, close the first stop valve, open the second stop valve and the third stop valve, and the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the wet heat exchanger through the four-way reversing valve and the third stop valve, releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the second stop valve and the throttle valve to become a gas-liquid mixed state and then enters the heat exchanger. The refrigerant is fully evaporated into gas in the heat exchanger and then discharged, and returns to the compressor through the four-way reversing valve and the pipeline, completing the refrigeration cycle; Winter cooling mode includes the following steps: S1: When the outdoor temperature is low, open the first stop valve, close the second stop valve and the third stop valve, and the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the heat exchanger through the four-way reversing valve, releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the throttle valve to become a gas-liquid mixed state and enters the dry heat exchanger. The refrigerant fully absorbs heat in the dry heat exchanger and evaporates into gas before being discharged, and then returns to the compressor through the first stop valve and the four-way reversing valve via the pipeline to complete the heating cycle; S2: When the outdoor temperature is high, close the first stop valve, open the second stop valve and the third stop valve, and the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the heat exchanger through the four-way reversing valve, releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the throttle valve to become a gas-liquid mixed state, then passes through the second stop valve to enter the wet heat exchanger, fully absorbs heat and evaporates into gas before being discharged, and then returns to the compressor through the third stop valve and the four-way reversing valve through the pipeline to complete the heating cycle. Compared with the prior art, the present invention has the following beneficial effects: The system design scheme set up in the present invention can switch to a more efficient heat exchange mode according to different outdoor environmental conditions in summer, thereby ensuring the efficient operation of the system throughout the seasonal cycle. Compared with conventional air source heat pump systems, the refrigeration energy efficiency of this scheme can be greatly improved, and it has obvious energy-saving advantages; this system design scheme can achieve frost-free operation in the winter heating mode. Compared with conventional air source heat pump systems, it reduces the energy loss caused by system frost, thereby improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the first method of using the overall device of the present invention; Figure 2 It is a schematic diagram of the second method of using the overall device of the present invention; In the figure: 10, compressor; 20, four-way reversing valve; 30, first stop valve; 40, second stop valve; 50, third stop valve; 60, dry heat exchanger; 70, wet heat exchanger; 80, throttle valve; 90, heat exchanger. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0013] Example 1

[0014] See also Figure 1-2 , an embodiment provided by the present invention: a dry-wet dual cold source heat pump system, comprising: a dry heat exchanger 60, a wet heat exchanger 70 is arranged on one side outside the dry heat exchanger 60; Also includes: The heat exchanger 90 is installed on the other side of the dry heat exchanger 60. The dry heat exchanger 60 and the heat exchanger 90 are connected by a first pipe. A throttle valve 80 is provided at the middle position of the first pipe. The dry heat exchanger 60 and the wet heat exchanger 70 are connected by a second pipe.

[0015] See also Figure 1 The first pipeline is connected to the wet heat exchanger 70 through a third pipeline, a second stop valve 40 is provided at the middle position of the third pipeline, and the dry heat exchanger 60 is connected to the wet heat exchanger 70 through a fourth pipeline.

[0016] The dry heat exchanger 60 adopts fin-tube heat exchanger, tube-sheet heat exchanger, and flat plate heat exchanger. The wet heat exchanger 70 can adopt a direct contact heat exchanger, an evaporative heat exchanger, a plate and tube heat exchanger, an immersion heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger. At the same time, the heat exchanger adopts a finned tube heat exchanger, a plate heat exchanger, an immersion heat exchanger, and a shell and tube heat exchanger. The connection form of the dry heat exchanger and the wet heat exchanger is parallel or series.

[0017] See also Figure 1 A third stop valve 50 is provided at the middle position of the fourth pipeline, a first stop valve 30 is provided on one side of the third stop valve 50, the first stop valve 30 is installed at the end connected to the dry heat exchanger 60, and the third stop valve 50 is installed at the end connected to the wet heat exchanger 70.

[0018] See also Figure 1 A four-way reversing valve 20 is provided on one side of the outer wall of the fourth pipe, one end of the four-way reversing valve 20 is connected to the heat exchanger 90 through a pipe, and a compressor 10 is provided on the other side of the outer wall of the four-way reversing valve 20, one side of the compressor 10 is connected to the other side of the outer wall of the four-way reversing valve 20 through a pipe, and the other end of the four-way reversing valve 20 is connected to the pipe on the other side of the compressor 10.

[0019] Example 2

[0020] See also Figure 1 , a first method of using a dry-wet dual cold source heat pump system, in a summer cooling mode, comprising the following steps: S1: When the outdoor temperature is high, the first stop valve 30 is opened, and the second stop valve 40 and the third stop valve 50 are closed. The high-temperature and high-pressure refrigerant gas discharged from the compressor 10 enters the dry heat exchanger 60 through the four-way reversing valve 20 and the first stop valve 30, releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the throttle valve 80 to become a gas-liquid mixed state and enters the heat exchanger 90. The refrigerant fully absorbs heat in the heat exchanger 90 and evaporates into gas before being discharged. It passes through the four-way reversing valve 20 and returns to the compressor 10 through the pipeline to complete the refrigeration cycle. S2: When the outdoor temperature is low, the first stop valve 30 is closed, and the second stop valve 40 and the third stop valve 50 are opened. The high-temperature and high-pressure refrigerant gas discharged from the compressor 10 enters the wet heat exchanger 70 through the four-way reversing valve 20 and the third stop valve 50, releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the second stop valve 40 and the throttle valve 80 to become a gas-liquid mixed state and enters the heat exchanger 90. The refrigerant is fully evaporated into gas in the heat exchanger 90 and then discharged. It passes through the four-way reversing valve 20 and returns to the compressor 10 through the pipeline to complete the refrigeration cycle. Winter cooling mode includes the following steps: S1: When the outdoor temperature is low, the first stop valve 30 is opened, and the second stop valve 40 and the third stop valve 50 are closed. The high-temperature and high-pressure refrigerant gas discharged from the compressor 10 enters the heat exchanger 90 through the four-way reversing valve 20, releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the throttle valve 80 to become a gas-liquid mixed state and enters the dry heat exchanger 60. The refrigerant fully absorbs heat in the dry heat exchanger 60 and evaporates into gas before being discharged. It passes through the first stop valve 30 and the four-way reversing valve 20 and returns to the compressor 10 through the pipeline to complete the heating cycle; S2: When the outdoor temperature is high, close the first stop valve 30, open the second stop valve 40 and the third stop valve 50, and the high-temperature and high-pressure refrigerant gas discharged from the compressor 10 enters the heat exchanger 90 through the four-way reversing valve 20, releases heat and condenses into liquid before being discharged. After the refrigerant liquid passes through the throttle valve 80 and becomes a gas-liquid mixed state, it passes through the second stop valve 40 and enters the wet heat exchanger 70, fully absorbs heat and evaporates into gas before being discharged, and returns to the compressor 10 through the pipeline through the third stop valve 50 and the four-way reversing valve 20 to complete the heating cycle.

[0021] Example 3

[0022] See also Figure 2 , a second method of using a dry-wet dual cold source heat pump system, in a summer cooling mode, comprising the following steps: S1: When the outdoor temperature is high, open the second stop valve 40 and the third stop valve 50, and close the first stop valve 30. The high-temperature and high-pressure refrigerant gas discharged from the compressor 10 enters the wet heat exchanger 70 through the four-way reversing valve 20 and the third stop valve 50, releases heat and condenses into liquid and is then discharged. The refrigerant liquid passes through the second stop valve 40 and the throttle valve 80 to become a gas-liquid mixed state and then enters the heat exchanger 90. The refrigerant fully absorbs heat in the heat exchanger 90 and evaporates into gas and is then discharged. It passes through the four-way reversing valve 20 and the pipeline and returns to the compressor 10 to complete the refrigeration cycle.

[0023] S2: When the outdoor temperature is low, close the second stop valve 40, open the first stop valve 30 and the third stop valve 50, and the high-temperature and high-pressure refrigerant gas discharged from the compressor 10 enters the wet heat exchanger 70 through the four-way reversing valve 20 and the third stop valve 50, releases heat and condenses into liquid and is then discharged. The refrigerant liquid enters the dry heat exchanger 60 through the first stop valve 30, is further cooled and then discharged, and the refrigerant liquid passes through the throttle valve 80 to become a gas-liquid mixed state and enters the heat exchanger 90. The refrigerant is fully evaporated into gas in the heat exchanger 90 and is discharged, and returns to the compressor 10 through the pipeline through the four-way reversing valve 20 to complete the refrigeration cycle.

[0024] Winter heating mode includes the following steps: S1: When the outdoor temperature is low, the first stop valve 30 and the third stop valve 50 are opened, and the second stop valve 40 is closed. The high-temperature and high-pressure refrigerant gas discharged from the compressor 10 enters the heat exchanger 90 through the four-way reversing valve 20, releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the throttle valve 80 to become a gas-liquid mixed state and enters the dry heat exchanger 60. The refrigerant absorbs heat in the dry heat exchanger 60 and evaporates into gas before being discharged. The refrigerant enters the wet heat exchanger 70 through the first stop valve 30. The refrigerant further absorbs heat and is discharged. The refrigerant passes through the third stop valve 50 and the four-way reversing valve 20 and returns to the compressor 10 through the pipeline to complete the heating cycle. S2: When the outdoor temperature is high, close the first stop valve 30, open the second stop valve 40 and the third stop valve 50, and the high-temperature and high-pressure refrigerant gas discharged from the compressor 10 enters the heat exchanger 90 through the four-way reversing valve 20, releases heat, condenses into liquid and is then discharged. After the refrigerant liquid passes through the throttle valve 80 and becomes a gas-liquid mixed state, it passes through the second stop valve 40 and enters the wet heat exchanger 70, fully absorbs heat, evaporates into gas and is then discharged, and returns to the compressor 10 through the pipeline through the third stop valve 50 and the four-way reversing valve 20, completing the heating cycle.

[0025] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0026] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A dry-wet dual-cold-source heat pump system, comprising a dry heat exchanger (60), wherein a wet heat exchanger (70) is arranged on one side outside the dry heat exchanger (60); It is characterized in that Also includes: A heat exchanger (90) is installed on the other side of the outside of the dry heat exchanger (60), the dry heat exchanger (60) and the heat exchanger (90) are connected via a first pipe, a throttle valve (80) is provided at a middle position of the first pipe, and the dry heat exchanger (60) and the wet heat exchanger (70) are connected via a second pipe.

2. A dry-wet dual cold source heat pump system according to claim 1, characterized in that: The first pipeline is connected to the wet heat exchanger (70) via a third pipeline, a second stop valve (40) is provided at a middle position of the third pipeline, and the dry heat exchanger (60) is connected to the wet heat exchanger (70) via a fourth pipeline.

3. A dry-wet dual cold source heat pump system according to claim 2, characterized in that: A third stop valve (50) is provided at a middle position of the fourth pipeline, and a first stop valve (30) is provided on one side of the third stop valve (50); the first stop valve (30) is installed at an end connected to the dry heat exchanger (60), and the third stop valve (50) is installed at an end connected to the wet heat exchanger (70).

4. A dry-wet dual cold source heat pump system according to claim 3, characterized in that: A four-way reversing valve (20) is arranged on one side of the outer wall of the fourth pipeline, one end of the four-way reversing valve (20) is connected to the heat exchanger (90) via a pipeline, a compressor (10) is arranged on the other side of the outer wall of the four-way reversing valve (20), one side of the compressor (10) is connected to the other side of the outer wall of the four-way reversing valve (20) via a pipeline, and the other end of the four-way reversing valve (20) is connected to the pipeline on the other side of the compressor (10).

5. A method for using a dry-wet dual cold source heat pump system according to any one of claims 1 to 4, characterized in that: Summer cooling mode, including the following steps: S1: When the outdoor temperature is high, the first stop valve (30) is opened, and the second stop valve (40) and the third stop valve (50) are closed. The high-temperature and high-pressure refrigerant gas discharged from the compressor (10) enters the dry heat exchanger (60) through the four-way reversing valve (20) and the first stop valve (30), releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the throttle valve (80) and changes into a gas-liquid mixed state before entering the heat exchanger (90). The refrigerant fully absorbs heat in the heat exchanger (90) and evaporates into gas before being discharged. It passes through the four-way reversing valve (20) and returns to the compressor (10) via the pipeline, completing the refrigeration cycle. S2: When the outdoor temperature is relatively low, the first stop valve (30) is closed, and the second stop valve (40) and the third stop valve (50) are opened. The high-temperature and high-pressure refrigerant gas discharged from the compressor (10) enters the wet heat exchanger (70) through the four-way reversing valve (20) and the third stop valve (50), releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the second stop valve (40) and the throttle valve (80) to become a gas-liquid mixed state and then enters the heat exchanger (90). The refrigerant is fully evaporated into gas in the heat exchanger (90) and then discharged. It passes through the four-way reversing valve (20) and returns to the compressor (10) via the pipeline, completing the refrigeration cycle. Winter cooling mode includes the following steps: S1: When the outdoor temperature is relatively low, the first stop valve (30) is opened, and the second stop valve (40) and the third stop valve (50) are closed. The high-temperature and high-pressure refrigerant gas discharged from the compressor (10) enters the heat exchanger (90) through the four-way reversing valve (20), releases heat and condenses into liquid before being discharged. The refrigerant liquid passes through the throttle valve (80) and becomes a gas-liquid mixed state before entering the dry heat exchanger (60). The refrigerant fully absorbs heat in the dry heat exchanger (60) and evaporates into gas before being discharged. The refrigerant passes through the first stop valve (30) and the four-way reversing valve (20) and returns to the compressor (10) through the pipeline, completing the heating cycle. S2: When the outdoor temperature is high, the first stop valve (30) is closed, and the second stop valve (40) and the third stop valve (50) are opened. The high-temperature and high-pressure refrigerant gas discharged from the compressor (10) enters the heat exchanger (90) through the four-way reversing valve (20), releases heat, condenses into liquid, and is then discharged. The refrigerant liquid passes through the throttle valve (80) to become a gas-liquid mixed state, and then passes through the second stop valve (40) to enter the wet heat exchanger (70), fully absorbs heat, evaporates into gas, and is then discharged. It passes through the third stop valve (50) and the four-way reversing valve (20) and returns to the compressor (10) via the pipeline, completing the heating cycle.

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