Heat pump total heat recovery heat exchange system and system control method

Abstract

The invention relates to a heat pump total heat recovery heat exchange system and a system control method. The heat pump total heat recovery system comprises a heat exchange device and a heat dissipation device. The water outlet end of the heat exchange device is controllably connected with the first end of the heat exchange pipe and the water inlet end of the condenser and connected with the E end of the four-way valve. The water inlet end is controllably connected with the second end of the heat exchange pipe and the water outlet end of the condenser and connected with the common end of the liquid storage device and the condenser. The water outlet end of the heat exchange device is used for discharging heat exchange media, and the water inlet end of the heat exchange device is used for receiving the heat exchange media. Through the adjustment of controllable connection, the heat cycle that the heat exchange device, the heat exchange pipe and the condenser are matched in pairs is achieved, total heat recovery is achieved through the heat cycle, extra refrigerants and system maintenance are not needed, the cost is low, and the system can be adapted to various system working modes.

Description

Technical Field

[0001] This application relates to the field of air heat pump technology, and in particular to a heat pump total heat recovery heat exchange system and system control method. Background Technology

[0002] An air source heat pump is an energy-saving device that utilizes high-grade energy to move heat from a low-grade heat source (air) to a high-grade heat source. It converts low-grade heat energy (such as the heat contained in air, soil, and water) that cannot be directly used into usable high-grade heat energy, thereby saving some high-grade energy (such as coal, natural gas, oil, and electricity). Specifically, the total heat recovery of an air source heat pump refers to the complete recovery of condensation heat that would otherwise be released into the environment during the cooling or heating process and its reuse for domestic hot water or other heat needs, thus improving energy efficiency.

[0003] Current air source heat pump units typically achieve total heat recovery by adding an additional hot water condenser. However, adding a hot water condenser to the system involves issues such as refrigerant distribution and lubricant accumulation, resulting in system complexity and lower reliability. Summary of the Invention

[0004] Based on the above analysis, the embodiments of the present invention aim to provide a heat pump total heat recovery heat exchange system and system control method to solve the shortcomings of the existing technology in achieving total heat recovery.

[0005] This application provides a heat pump total heat recovery system.

[0006] A heat pump total heat recovery system, comprising: The heat exchange device has its outlet end controllably connected to the first end of the heat exchange tube and the inlet end of the condenser, and is also connected to the E end of the four-way valve. The inlet end is controllably connected to the second end of the heat exchange tube and the outlet end of the condenser, and is also connected to the common end of the liquid storage tank and the condenser; wherein, the outlet end of the heat exchange device is used to discharge the heat exchange medium, and the inlet end of the heat exchange device is used to receive the heat exchange medium; A heat dissipation device is provided in conjunction with the heat exchange device to dissipate heat from the heat exchange device.

[0007] The aforementioned heat pump total heat recovery system includes a heat exchanger and a heat dissipation device. The outlet of the heat exchanger is controllably connected to the first end of the heat exchange tube and the inlet of the condenser, and also connected to the E terminal of a four-way valve. The inlet is controllably connected to the second end of the heat exchange tube and the outlet of the condenser, and also connected to the common terminal of the receiver and the condenser. The outlet of the heat exchanger is used to discharge the heat exchange medium, and the inlet is used to receive the heat exchange medium. Through controllable connection adjustments, a three-way heat cycle is achieved between the heat exchanger, heat exchange tube, and condenser, realizing total heat recovery through this heat cycle. This system requires no additional refrigerant or system maintenance, is low-cost, and adaptable to various system operating modes.

[0008] As one optional embodiment, the heat exchange device is a coiled metal heat exchange tube.

[0009] As one optional embodiment, the heat dissipation device includes heat dissipation fins disposed on the heat exchange device and a heat dissipation fan disposed opposite to the heat exchange device.

[0010] As one optional embodiment, it also includes a first three-way valve and a second three-way valve; The first three-way valve is used to controllably connect the outlet end of the heat exchange device, the first end of the heat exchange tube, and the inlet end of the condenser, and the second three-way valve is used to controllably connect the inlet end of the heat exchange device, the second end of the heat exchange tube, and the outlet end of the condenser.

[0011] As one optional embodiment, it also includes a heat exchange medium driving device for driving the circulation of the heat exchange medium.

[0012] This application also provides a system control method for a heat pump total heat recovery system.

[0013] A system control method for a heat pump total heat recovery system includes the following steps: Connect the outlet of the heat exchange device to the first end of the heat exchange tube, and connect the inlet of the heat exchange device to the second end of the heat exchange tube to start the circulation of the heat exchange medium. Adjust the four-way valve to output the compressor's heat exhaust to the heat exchange device.

[0014] The system control method of the aforementioned heat pump total heat recovery system involves connecting the outlet end of the heat exchange device to the first end of the heat exchange tube and connecting the inlet end of the heat exchange device to the second end of the heat exchange tube to initiate the circulation of the heat exchange medium; adjusting the four-way valve to output the compressor's exhaust heat to the heat exchange device. Based on this, when the entire heat pump system is in cooling mode, the compressor's exhaust heat is circulated through the heat exchange device into the heat exchange tube to heat the water in the hot water tank, achieving total heat recovery during cooling.

[0015] As one optional embodiment, the method further includes the following steps: Turn off the cooling device until the water temperature in the hot water tank is higher than the set heating temperature.

[0016] As one optional embodiment, the method further includes the following steps: When the water temperature exceeds the set heating temperature, the circulation loop of the heat exchange medium is shut off.

[0017] This application also provides another system control method for a heat pump total heat recovery system.

[0018] A system control method for a heat pump total heat recovery system includes the following steps: Start the heat dissipation device and connect the circulation loop between the heat exchange tube and the condenser, while simultaneously removing the heat exchange device from the circulation loop; When the circulation loop reaches the defrosting state, the heat dissipation device is turned off.

[0019] The system control method of the heat pump total heat recovery system in this application embodiment starts the heat dissipation device and connects the circulation loop between the heat exchange tube and the condenser, while simultaneously excluding the heat exchange device from the circulation loop; when the circulation loop reaches the defrosting state, the heat dissipation device is turned off. When the entire heat pump system unit is in heating mode, the heat discharged from the condenser is circulated through the heat exchange device to heat the water in the hot water tank in the heat exchange tube, thereby achieving total heat recovery in heating mode.

[0020] As one optional embodiment, the method further includes the following steps: When the circulation loop reaches the defrost state, the outlet end of the heat exchange device is connected to the first end of the heat exchange tube, and the inlet end of the heat exchange device is connected to the second end of the heat exchange tube to start the circulation of the heat exchange medium.

[0021] The system utilizes hot water from the hot water tank to circulate to the heat exchange device, and the circulation of the heat exchange medium enables defrosting without shutting down the machine. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a heat pump total heat recovery system according to an embodiment of the application; Figure 2 A flowchart of a system control method for a heat pump total heat recovery system according to an embodiment of the application; Figure 3 This is a flowchart of a system control method for a heat pump total heat recovery system according to another embodiment of the application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0024] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] To keep the following description of the embodiments of this application clear and concise, detailed descriptions of some known functions and components have been omitted.

[0026] This application provides a heat pump total heat recovery system.

[0027] A heat pump total heat recovery system, comprising: The heat exchange device has its outlet end controllably connected to the first end of the heat exchange tube and the inlet end of the condenser, and connected to the E end of the four-way valve; its inlet end is controllably connected to the second end of the heat exchange tube and the outlet end of the condenser, and connected to the common end of the liquid receiver and the condenser. The outlet end of the heat exchange device is used to discharge the heat exchange medium, and the inlet end of the heat exchange device is used to receive the heat exchange medium. A heat dissipation device is provided in conjunction with the heat exchange device to dissipate heat from the heat exchange device.

[0028] In this embodiment, multiple thermal circulation loops can be realized through the controllable connection of the dual-end selection and the selection of the four-way valve: 1- thermal circulation loop between the heat exchanger and the heat exchange tube; 2- thermal circulation loop between the heat exchanger and the condenser; 3- thermal circulation loop between the heat exchanger and the compressor. The heat exchanger, acting as a thermal circulation intermediary in these multiple loops, facilitates heat transfer between the heat exchange tube, the condenser, and the compressor, thereby achieving heat recovery and utilization, and serving as the basis for total heat recovery.

[0029] The heat exchange medium can be antifreeze, refrigerant, or water. To facilitate compatibility with the heat exchange tubes, condenser, and compressor, it is preferable to use the water already present in the heat exchange tubes as the heat exchange medium, achieving heat circulation through the water circulation of the compressor's heat discharge and the condenser's heat discharge.

[0030] As one of the preferred embodiments, Figure 1 This is a schematic diagram of the structure of a heat pump total heat recovery system according to an embodiment of the application, as shown below. Figure 1 As shown, the heat exchange device is a coiled metal heat exchange tube.

[0031] like Figure 1 As shown, the coiled pipe design between the outlet (hot water outlet) and inlet (hot water inlet) of the metal heat exchange tube improves heat dissipation efficiency and the foundation of heat circulation.

[0032] Preferably, such as Figure 1 As shown, the heat dissipation device includes heat dissipation fins disposed on the heat exchange device and a heat dissipation fan disposed opposite to the heat exchange device.

[0033] like Figure 1 As shown, when the heat dissipation device is started, the cooling fan starts and blows airflow onto the heat dissipation fins to remove the heat from the fins; conversely, when the heat dissipation device is turned off, the cooling fan turns off.

[0034] Preferably, such as Figure 1 As shown, it also includes a first three-way valve and a second three-way valve; The first three-way valve is used to controllably connect the outlet end of the heat exchange device, the first end of the heat exchange tube, and the inlet end of the condenser, and the second three-way valve is used to controllably connect the inlet end of the heat exchange device, the second end of the heat exchange tube, and the outlet end of the condenser.

[0035] like Figure 1 As shown, both the first three-way valve and the second three-way valve have three ends (A / B / C). The C end of the first three-way valve serves as the outlet end (hot water outlet) of the heat exchange device, and the C end of the second three-way valve serves as the inlet end (hot water inlet) of the heat exchange device.

[0036] like Figure 1As shown, when the first three-way valve and the second three-way valve are connected at terminals A and B, the condenser can discharge heat to the heat exchanger. When the first three-way valve and the second three-way valve are connected at terminals A and C, in conjunction with port E of the four-way valve, the compressor can discharge heat to the heat exchanger.

[0037] Preferably, such as Figure 1 As shown, a heat pump total heat recovery system according to one embodiment of the application further includes a heat exchange medium driving device for driving the circulation of the heat exchange medium.

[0038] The heat exchange medium driving device is installed in the connection loop between the heat exchange tube and the heat exchange device to drive the flow of the heat exchange medium. Preferably, as follows: Figure 1 As shown, the heat exchange medium driving device uses a water pump to pump the heat exchange medium.

[0039] The heat pump total heat recovery system of this application embodiment includes a heat exchange device and a heat dissipation device. The outlet of the heat exchange device is controllably connected to the first end of the heat exchange tube and the inlet of the condenser, and connected to the E end of a four-way valve; the inlet is controllably connected to the second end of the heat exchange tube and the outlet of the condenser, and connected to the common end of the receiver and the condenser. The outlet of the heat exchange device is used to discharge the heat exchange medium, and the inlet of the heat exchange device is used to receive the heat exchange medium. Through the adjustment of the controllable connections, a heat cycle is achieved between the heat exchange device, the heat exchange tube, and the condenser, achieving total heat recovery through the heat cycle. This eliminates the need for additional refrigerant and system maintenance, resulting in low cost and adaptability to various system operating modes.

[0040] Based on the heat pump total heat recovery system, this application embodiment also provides a system control method for the heat pump total heat recovery system.

[0041] ,like Figure 2 As shown, a system control method for a heat pump total heat recovery system according to an embodiment of the application includes steps S100 and S101: Figure 2 A flowchart illustrating the system control method of a heat pump total heat recovery system according to an embodiment of the application. S100, connect the outlet end of the heat exchange device to the first end of the heat exchange tube, and connect the inlet end of the heat exchange device to the second end of the heat exchange tube to start the circulation of the heat exchange medium; S101, Adjust the four-way valve to output the compressor's heat exhaust to the heat exchange device.

[0042] like Figure 1 As shown, when the heat pump system unit is started for cooling, the hot water pump can be turned on by simultaneously connecting the A and C ends of the first three-way valve and the second three-way valve. The fan is turned off, and the heat discharged by the compressor heats the heat exchange medium in the heat exchange device. The heat is then circulated to the heat exchange tube of the hot water tank through the water pump, and then the hot water tank is heated, thus achieving cooling while recovering total heat.

[0043] Preferably, such as Figure 2 As shown, the system control method of a heat pump total heat recovery system according to one embodiment of the application further includes step S102: S102, when the water temperature is higher than the heating set temperature, the circulation loop of the heat exchange medium is shut off.

[0044] The heating temperature is set at 70-80℃, preferably 75℃. That is... Figure 1 As shown, when the water in the hot water tank has been heated to the set heating temperature, the water pump is turned off to shut off the circulation loop of the heat exchange medium.

[0045] Preferably, such as Figure 2 As shown, the system control method of a heat pump total heat recovery system according to one embodiment of the application further includes step S103: S103, turn off the heat dissipation device until the water temperature in the hot water tank is higher than the heating set temperature.

[0046] In this embodiment of the application, the heat dissipation device is initially in a closed state, i.e., as shown below. Figure 1 The fan shown does not start until the water temperature in the hot water tank is higher than the set heating temperature, at which point the heat dissipation device starts, i.e., the fan starts, and at the same time, the A and C ends of the first three-way valve and the second three-way valve are disconnected.

[0047] Therefore, when the heat pump system is in cooling mode, the compressor's exhaust heat is used for total heat recovery to heat the water in the hot water tank, improving energy efficiency and reducing additional losses. At the same time, no additional equipment is required, avoiding refrigerant distribution and system lubricant accumulation issues, simplifying the system structure, and improving reliability.

[0048] The system control method of the heat pump total heat recovery system in the above-mentioned embodiment connects the outlet end of the heat exchange device to the first end of the heat exchange tube and connects the inlet end of the heat exchange device to the second end of the heat exchange tube to start the circulation of the heat exchange medium; and adjusts the four-way valve to output the compressor's exhaust heat to the heat exchange device. Based on this, when the heat pump system unit is in cooling mode, the compressor's exhaust heat is circulated through the heat exchange device into the heat exchange tube to heat the water in the hot water tank, thus achieving total heat recovery during cooling.

[0049] Based on the heat pump total heat recovery system, this application embodiment also provides another system control method for the heat pump total heat recovery system.

[0050] Figure 3 A flowchart of the system control method for a heat pump total heat recovery system according to another embodiment of the application is shown below. Figure 3 As shown, the system control method of a heat pump total heat recovery system according to another embodiment of the application includes steps S200 and S201: S200, start the heat dissipation device and connect the circulation loop between the heat exchange tube and the condenser, while simultaneously removing the heat exchange device from the circulation loop; S201, when the circulation loop reaches the defrosting state, the heat dissipation device is turned off.

[0051] This application's embodiments are mainly applied to the heating function of heat pump systems in winter. When the unit is in heating mode, the heat exchange device acts as an evaporator, and the heat dissipation device is activated for heat exchange. For example... Figure 1 As shown, at this time, the A and B ends of the first three-way valve and the second three-way valve are connected, and the fan and water pump are turned on at the same time. The water in the hot water tank is heated by the heat dissipation of the condenser, and the heat is dissipated by the fan to achieve total heat recovery.

[0052] Preferably, such as Figure 3 As shown, the system control method of the heat pump total heat recovery system in another embodiment of the application further includes step S202: S202, when the circulation loop is in the defrost state, connect the outlet end of the heat exchange device to the first end of the heat exchange tube, and connect the inlet end of the heat exchange device to the second end of the heat exchange tube to start the circulation of the heat exchange medium.

[0053] like Figure 1 As shown, when the heat pump system unit needs to be defrosted, the fan is turned off, and the A and C ends of the first three-way valve and the second three-way valve are connected. The hot water stored in the hot water tank is circulated to the heat exchange device by the water pump. The heat generated by the heat exchange device is used to achieve defrosting without affecting the operation of the heat pump system unit.

[0054] The system control method of the heat pump total heat recovery system in another embodiment of the above application involves connecting the outlet end of the heat exchange device to the first end of the heat exchange tube and connecting the inlet end of the heat exchange device to the second end of the heat exchange tube to start the circulation of the heat exchange medium; adjusting the four-way valve to output the compressor's exhaust heat to the heat exchange device. Based on this, when the entire heat pump system unit is in cooling mode, the compressor's exhaust heat is circulated through the heat exchange device into the heat exchange tube to heat the water in the hot water tank, achieving total heat recovery during cooling.

[0055] The following points should be noted regarding this application: (1) The accompanying drawings of the embodiments of this application only involve the structures involved in the embodiments of this application. Other structures can be referred to the general design.

[0056] (2) For clarity, the thickness and dimensions of layers or structures are enlarged in the accompanying drawings used to describe embodiments of the invention. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element, or there may be intermediate elements present.

[0057] (3) Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other to obtain new embodiments. The above are only specific implementations of this application, but the protection scope of this application is not limited thereto, and the protection scope of this application shall be determined by the protection scope of the claims.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A heat pump total heat recovery system, characterized in that, include: The heat exchange device has its outlet end controllably connected to the first end of the heat exchange tube and the inlet end of the condenser, and connected to the E end of the four-way valve; its inlet end is controllably connected to the second end of the heat exchange tube and the outlet end of the condenser, and connected to the common end of the liquid receiver and the condenser. The outlet end of the heat exchange device is used to discharge the heat exchange medium, and the inlet end of the heat exchange device is used to receive the heat exchange medium. A heat dissipation device is provided in conjunction with the heat exchange device to dissipate heat from the heat exchange device.

2. The heat pump total heat recovery system according to claim 1, characterized in that, The heat exchange device is a coiled metal heat exchange tube.

3. The heat pump total heat recovery system according to claim 1, characterized in that, The heat dissipation device includes heat dissipation fins disposed on the heat exchange device and a heat dissipation fan disposed opposite to the heat exchange device.

4. The heat pump total heat recovery system according to claim 1, characterized in that, It also includes a first three-way valve and a second three-way valve; The first three-way valve is used to controllably connect the outlet end of the heat exchange device, the first end of the heat exchange tube, and the inlet end of the condenser, and the second three-way valve is used to controllably connect the inlet end of the heat exchange device, the second end of the heat exchange tube, and the outlet end of the condenser.

5. The heat pump total heat recovery system according to claim 1, characterized in that, It also includes a heat exchange medium driving device for driving the circulation of the heat exchange medium.

6. A system control method for a heat pump total heat recovery system, applied to the heat pump total heat recovery system as described in any one of claims 1 to 5, characterized in that, Including the following steps: Connect the outlet of the heat exchange device to the first end of the heat exchange tube, and connect the inlet of the heat exchange device to the second end of the heat exchange tube to start the circulation of the heat exchange medium. Adjust the four-way valve to output the compressor's heat exhaust to the heat exchange device.

7. The system control method for the heat pump total heat recovery system according to claim 6, characterized in that, It also includes the following steps: Turn off the cooling device until the water temperature in the hot water tank is higher than the set heating temperature.

8. The system control method for the heat pump total heat recovery system according to claim 7, characterized in that, It also includes the following steps: When the water temperature exceeds the set heating temperature, the circulation loop of the heat exchange medium is shut off.

9. A system control method for a heat pump total heat recovery system, applied to the heat pump total heat recovery system as described in any one of claims 1 to 5, characterized in that, Including the following steps: Start the heat dissipation device and connect the circulation loop between the heat exchange tube and the condenser, while simultaneously removing the heat exchange device from the circulation loop; When the circulation loop reaches the defrosting state, the heat dissipation device is turned off.

10. The system control method for the heat pump total heat recovery system according to claim 9, characterized in that, It also includes the following steps: When the circulation loop reaches the defrost state, the outlet end of the heat exchange device is connected to the first end of the heat exchange tube, and the inlet end of the heat exchange device is connected to the second end of the heat exchange tube to start the circulation of the heat exchange medium.

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