Two-stage heat pump system using multi-channel coil heat exchanger

Abstract

The utility model discloses a two-stage heat pump system using a multi-channel coil heat exchanger. The two-stage heat pump system comprises a first-stage heat pump, an energy storage and release water tank energy storage / defrosting heat supply system, an energy storage and release water tank heat supply system, a second-stage heat pump, a system two-stage operation heat supply loop and a system single-stage operation heat supply / cold supply loop. The first-stage heat pump forms a first circulation loop; the energy storage and release water tank energy storage / defrosting heat supply system forms a second circulation loop; the energy storage and release water tank heat supply system forms a third circulation loop; the second-stage heat pump forms a fourth circulation loop; the two-stage operation heat supply loop of the system forms a fifth circulation loop; and a sixth circulation loop is formed by a single-stage operation heat / cold supply loop of the system. According to the system, the two-stage compression technology is adopted, the energy storage and release water tank energy storage system is matched, the first-stage heat pump directly supplies heat to the second-stage heat pump, higher operation efficiency is achieved, and it is guaranteed that the system can achieve efficient operation and high-temperature heat supply under the severe cold environment condition.

Description

Technical Field

[0001] The utility model relates to the field of heat pump heating, in particular to a two-stage heat pump system using a multi-channel coil heat exchanger. Background Art

[0002] The two-stage compression air source heat pump products on the market currently have the following main problems: First, simple cascade two-stage heat pumps are difficult to match, and cannot meet the stable supply between the first-stage heat supply and the second-stage heat pump heat demand under different environmental conditions, resulting in unstable equipment operation; and simple cascade two-stage heat pumps must operate at the same time to achieve the refrigeration function, resulting in low refrigeration efficiency; second, the water-coupled unit requires two heat exchanges, which reduces the operating efficiency of the unit. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide a two-stage heat pump system using a multi-channel coil heat exchanger with stable operation and high efficiency in view of the defects of the prior art mentioned above.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A two-stage heat pump system using a multi-channel coil heat exchanger, comprising a primary heat pump, an energy storage / defrosting heating system of an energy storage / release water tank, an energy storage / release water tank heating system, a secondary heat pump, a system two-stage operation heating circuit, and a system single-stage operation heating / cooling circuit;

[0006] The primary heat pump comprises a primary compressor, the outlet of the primary compressor is connected to the second channel inlet of the multichannel coil heat exchanger through a four-way reversing valve, the second channel outlet of the multichannel coil heat exchanger is connected to the primary evaporator through a primary throttling device, and the primary evaporator is connected to the inlet of the primary compressor through the four-way reversing valve to form a first circulation loop;

[0007] The energy storage / defrosting heating system of the energy storage / release water tank comprises a first channel of a multi-channel coil heat exchanger, the first channel outlet of the multi-channel coil heat exchanger is connected to the energy storage / release water tank through a first pipeline, the energy storage / release water tank is connected to an internal circulation pump through a second pipeline, the internal circulation pump is connected to a first valve through a third pipeline, the first valve is connected to a fourth pipeline, and the fourth pipeline is connected to the first channel inlet of the multi-channel coil heat exchanger to form a second circulation loop;

[0008] The energy storage and release water tank heating system comprises a fourth channel of the multi-channel coil heat exchanger, wherein the fourth channel outlet of the multi-channel coil heat exchanger is sequentially connected to a fifth pipeline, an energy storage and release water tank, an internal circulation pump, a second valve and a fourth channel inlet of the multi-channel coil heat exchanger to form a third circulation loop;

[0009] The secondary heat pump comprises a secondary condenser, wherein the first flow channel outlet of the secondary condenser is sequentially connected to the secondary throttling device, the third channel of the multi-channel coil heat exchanger, the secondary compressor and the first flow channel inlet of the secondary condenser to form a fourth circulation loop;

[0010] The dual-stage operation heating circuit of the system includes a second flow channel of the secondary condenser, the outlet of the second flow channel of the secondary condenser is connected to the energy supply outlet pipe, and the inlet of the second flow channel of the secondary condenser is connected to the energy supply return pipe through the third valve, the sixth pipeline and the energy supply circulation pump in sequence to form a fifth circulation circuit;

[0011] The single-stage heating / cooling loop of the system includes an energy supply circulation pump, which is connected to the fourth valve through the seventh pipeline, and the fourth valve is connected to the first channel inlet of the multi-channel coil heat exchanger through the eighth pipeline. The first channel outlet of the multi-channel coil heat exchanger is connected to the ninth pipeline through the energy storage and release water tank, and the ninth pipeline is connected to the energy supply water outlet pipe through a check valve to form a sixth circulation loop.

[0012] The first pipeline is connected to the fifth pipeline; the fourth pipeline is connected to the eighth pipeline; the second pipeline is connected to the ninth pipeline; and the seventh pipeline is connected to the sixth pipeline.

[0013] The multi-channel coil heat exchanger has four channels, namely the first channel, the second channel, the third channel and the fourth channel. The second channel is arranged around the first channel, the third channel is arranged around the second channel, and the fourth channel is arranged around the third channel. The first channel and the fourth channel are water heat exchange channels, the second channel is a primary heat pump refrigerant heat exchange channel, and the third channel is a secondary heat pump refrigerant heat exchange channel.

[0014] The first valve, the second valve, the third valve and the fourth valve are all electric valves.

[0015] An electric heater is arranged in the energy storage water tank.

[0016] The utility model also provides a control method for a two-stage heat pump system using a multi-channel coil heat exchanger, comprising the following steps:

[0017] Single-stage heating mode: open the fourth valve, close the first valve, the second valve and the third valve; start the energy circulation pump and the first-stage heat pump, close the internal circulation pump and the second-stage heat pump, and the first circulation loop and the sixth circulation loop work. At this time, the first-stage heat pump starts heating and supplies heat to the outside through the multi-channel coil heat exchanger;

[0018] Two-stage heating mode: open the third valve and close the fourth valve; start the energy circulation pump, the primary heat pump and the secondary heat pump. The secondary heat pump absorbs the heat provided by the primary heat pump through the multi-channel coil heat exchanger and supplies heat to the outside through the secondary condenser of the secondary heat pump;

[0019] In the two-stage heating mode, the energy storage / defrosting heating system of the energy storage tank automatically operates according to the heating capacity of the first-stage heat pump and the heat demand of the second-stage heat pump:

[0020] When the heating capacity of the primary heat pump is greater than the heat required by the secondary heat pump, the internal circulation pump and the first valve are started, and the second valve is closed. Part of the heat is absorbed through the second channel of the multi-channel coil heat exchanger and stored in the energy storage tank to avoid excessive heat provided by the primary heat pump to impact the secondary heat pump and frequent start and stop of the primary heat pump;

[0021] When the heating capacity of the primary heat pump is equal to the heat required by the secondary heat pump, the internal circulation pump is stopped, the first valve and the second valve are closed, the energy storage tank no longer absorbs heat, and the heating capacity of the primary heat pump is fully supplied to the secondary heat pump;

[0022] When the heating capacity of the primary heat pump cannot meet the heat required by the secondary heat pump, start the internal circulation pump, open the second valve, close the first valve, and the storage tank releases the stored heat to heat the secondary heat pump together with the primary heat pump to ensure that the secondary heat pump obtains sufficient heat to work normally;

[0023] When the heating capacity of the first-stage heat pump is insufficient, the electric heating in the energy storage tank is started to supplement some heat to ensure the heat required for the normal operation of the second-stage heat pump;

[0024] Cooling mode: open the fourth valve and close the third valve; start the energy circulation pump and the first-stage heat pump, close the internal circulation pump, the first valve and the second valve, and stop the operation of the second-stage heat pump; the first circulation loop and the sixth circulation loop work; at this time, the first-stage heat pump starts the cooling work and supplies cold air to the outside through the multi-channel coil heat exchanger;

[0025] Defrost mode: start the internal circulation pump, open the first valve, close the second valve, start the first-stage heat pump defrost working mode, and the heat stored in the energy storage water tank is provided to the first-stage heat pump as a defrost heat source through the multi-channel coil heat exchanger in the second circulation loop; when the heat in the energy storage water tank is insufficient, start the electric heater in the energy storage water tank to supplement part of the heat to ensure the heat required for defrosting of the first-stage heat pump. In this mode, the energy supply circulation pump and the second-stage heat pump are stopped, and the system stops supplying heat to the outside.

[0026] Furthermore, in the single-stage heating mode or the two-stage heating mode, the flow directions of the refrigerant in adjacent channels of the multi-channel coil heat exchanger are opposite.

[0027] Furthermore, a temperature sensor is provided on the multichannel coil heat exchanger to detect the temperature inside the multichannel coil heat exchanger; the detected temperature inside the multichannel coil heat exchanger is compared with the first set value, the second set value and the third set value, and the comparison result is as follows:

[0028] When it is detected that the temperature of the multi-channel coil heat exchanger exceeds the first set value, it is determined that the heating capacity of the primary heat pump is greater than the heat required by the secondary heat pump;

[0029] When it is detected that the temperature of the multi-channel coil heat exchanger is between the first set value and the second set value, it is determined that the heating capacity of the primary heat pump is equivalent to the heat required by the secondary heat pump;

[0030] When it is detected that the temperature of the multi-channel coil heat exchanger is less than the second set value, it is determined that the heating capacity of the primary heat pump cannot meet the heat required by the secondary heat pump;

[0031] When it is detected that the temperature of the multi-channel coil heat exchanger is less than the third set value, it is determined that the heating capacity of the primary heat pump is insufficient.

[0032] The first setting value is 43-47°C, the second setting value is 39-42°C, and the third setting value is 33-38°C.

[0033] The beneficial effects of the technical solution provided by the embodiment of the utility model are:

[0034] The system of this utility model adopts two-stage compression technology, and is equipped with an energy storage tank energy storage system. The first-stage heat pump directly supplies heat to the second-stage heat pump. Compared with the two-stage heat pump unit coupled through the intermediate buffer water tank, it has higher operating efficiency, ensuring that the system can achieve efficient operation and high-temperature heating under severe cold environmental conditions. In addition, the system defrosts using the heat of the energy storage tank, without extracting the terminal heat, to improve the heating comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a two-stage heat pump system using a multi-channel coil heat exchanger provided by an embodiment of the utility model;

[0036] Figure 2 It is a structural schematic diagram of a multi-channel coil heat exchanger provided by an embodiment of the utility model;

[0037] Figure 3 It is a partial cross-sectional view of a multi-channel coil heat exchanger provided by an embodiment of the utility model;

[0038] Figure 4 It is a cross-sectional view from another direction of the multi-channel coil heat exchanger provided by an embodiment of the utility model.

[0039] In the figure:

[0040] 1- primary heat pump; 2- energy storage / defrosting heating system of energy storage water tank; 3- energy storage water tank heating system; 4- secondary heat pump; 5- system two-stage operation heating circuit; 6- system single-stage operation heating / cooling circuit; 7- primary compressor; 8- four-way reversing valve; 9- multi-channel coil heat exchanger; 10- second channel; 11- primary throttling device; 12- primary evaporator; 13 first channel; 14- first pipeline; 15- energy storage water tank; 16- second pipeline; 17- internal circulation pump; 18-third pipeline; 19-first valve; 20-fourth pipeline; 21-fourth channel; 22-fifth pipeline; 23-second valve; 24-secondary condenser; 25-secondary throttling device; 26-third channel; 27-secondary compressor; 28-energy supply outlet pipe; 29-third valve; 30-sixth pipeline; 31-energy supply circulation pump; 32-energy supply return pipe; 33-seventh pipeline; 34-fourth valve; 35-eighth pipeline; 36-ninth pipeline; 37-check valve. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] See also Figure 1 A two-stage heat pump system using a multi-channel coil heat exchanger includes a primary heat pump 1, an energy storage / defrosting heating system 2 of an energy storage / discharge water tank, a heating system 3 of an energy storage / discharge water tank, a secondary heat pump 4, a system dual-stage operation heating circuit 5, and a system single-stage operation heating / cooling circuit 6;

[0043] The primary heat pump 1 comprises a primary compressor 7, the outlet of the primary compressor 7 is connected to the inlet of the second channel 10 of the multichannel coil heat exchanger 9 through a four-way reversing valve 8, the outlet of the second channel 10 of the multichannel coil heat exchanger 9 is connected to the primary evaporator 12 through a primary throttling device 11, and the primary evaporator 12 is connected to the inlet of the primary compressor 7 through the four-way reversing valve 8, forming a first circulation loop, which is a circulation loop of the primary heat pump refrigerant system of the system;

[0044] The energy storage / defrosting heating system 2 of the energy storage tank includes a first channel 13 of a multi-channel coil heat exchanger 9, the outlet of the first channel 13 of the multi-channel coil heat exchanger 9 is connected to the energy storage water tank 15 through a first pipe 14, the energy storage water tank 15 is connected to an internal circulation pump 17 through a second pipe 16, the internal circulation pump 17 is connected to a first valve 19 through a third pipe 18, the first valve 19 is connected to a fourth pipe 20, and the fourth pipe 20 is connected to the inlet of the first channel 13 of the multi-channel coil heat exchanger 9 to form a second circulation loop; the second circulation loop is a system two-stage operation energy storage water tank heat storage loop and a primary heat pump defrosting operation heating loop;

[0045] The energy storage and release water tank heating system 3 includes a fourth channel 21 of the multi-channel coil heat exchanger 9, and the outlet of the fourth channel 21 of the multi-channel coil heat exchanger 9 is sequentially connected to the fifth pipeline 22, the energy storage and release water tank 15, the internal circulation pump 17, the second valve 23 and the inlet of the fourth channel 21 of the multi-channel coil heat exchanger 9 to form a third circulation loop. The third circulation loop is a system dual-stage operation energy storage and release water tank heat supply loop;

[0046] The secondary heat pump 4 includes a secondary condenser 24, and the first flow channel outlet of the secondary condenser 24 is sequentially connected to the secondary throttling device 25, the third channel 26 of the multi-channel coil heat exchanger 9, the secondary compressor 27 and the first flow channel inlet of the secondary condenser 24 to form a fourth circulation loop; the fourth circulation loop is a system secondary heat pump refrigerant system circulation loop;

[0047] The system's two-stage operation heating circuit 5 includes a second flow channel of a secondary condenser 24, the outlet of the second flow channel of the secondary condenser 24 is connected to an energy water outlet pipe 28, the inlet of the second flow channel of the secondary condenser 24 is connected to an energy return pipe 32 via a third valve 29, a sixth pipeline 30 and an energy circulation pump 31 in sequence, the energy return pipe 32 and the energy outlet pipe 28 are connected to a heat end to form a fifth circulation loop; the fifth circulation loop is the system's two-stage operation heating circuit.

[0048] The system single-stage operation heating / cooling loop 6 includes an energy supply circulation pump 31, an energy supply return pipe 32 is connected to the energy supply circulation pump 31, the energy supply circulation pump 31 is connected to the fourth valve 34 through the seventh pipe 33, the fourth valve 34 is connected to the first channel 13 inlet of the multi-channel coil heat exchanger 9 through the eighth pipe 35, the first channel outlet of the multi-channel coil heat exchanger 9 is connected to the ninth pipe 36 through the energy storage water tank 15, the ninth pipe 36 is connected to the energy supply outlet pipe 28 through the check valve 37, the energy supply return pipe 32 and the energy supply outlet pipe 28 are connected to the heat end to form a sixth circulation loop, and the sixth circulation loop is the system single-stage operation heating / cooling loop.

[0049] The utility model adopts a dual compressor system with a multi-channel coil heat exchanger and an energy storage water tank system to form a two-stage heat pump, which can automatically operate in single or double stages. The heat pump system of the utility model can operate at high temperature, high efficiency and energy saving in severe cold environments, and has the advantages of stable and efficient system operation.

[0050] In order to facilitate the connection of pipelines, the first pipeline 14 is connected to the fifth pipeline 22; the fourth pipeline 20 is connected to the eighth pipeline 35; the second pipeline 16 is connected to the ninth pipeline 36; and the seventh pipeline 33 is connected to the sixth pipeline 30.

[0051] See also Figure 2 , Figure 3 and Figure 4The multi-channel coil heat exchanger 9 has four channels, namely a first channel 13, a second channel 10, a third channel 26 and a fourth channel 21. The second channel 10 is arranged outside the first channel 13, the third channel 26 is arranged outside the second channel 10, and the fourth channel 21 is arranged outside the third channel 26; the first channel 13 and the fourth channel 21 are water heat exchange channels, the second channel 10 is a primary heat pump refrigerant heat exchange channel, that is, a primary heat pump fluorine channel channel, and the third channel 26 is a secondary heat pump refrigerant heat exchange channel, that is, a secondary heat pump fluorine channel channel.

[0052] The multi-channel coil heat exchanger of the utility model preferably adopts a four-channel shell-and-tube heat exchanger, and the four channels can exchange heat between any two adjacent channels or between three adjacent channels at the same time. In the two-stage heat pump mode, the primary heat pump directly supplies heat to the secondary heat pump through multi-channel coil heat exchange, ensuring that the system operation efficiency is much higher than the water-coupled two-stage heat pump system; at the same time, the system can also adjust the balance through the water channel of the multi-channel coil heat exchanger, adjust the impact on the operation of the secondary heat pump caused by the change in the heating capacity of the primary heat pump due to changes in environmental conditions, ensure the stability of the system operation, and eliminate the unstable operation of the simple cascade unit under different environmental conditions. In addition, the application of the multi-channel coil heat exchanger can also realize the function of providing refrigeration in the single-stage operation of the two-stage heat pump system.

[0053] See also Figure 1 Preferably, in order to realize automatic control, the first valve 19, the second valve 23, the third valve 29 and the fourth valve 34 are all electric valves.

[0054] Preferably, an electric heater is provided in the energy storage water tank 15 .

[0055] The utility model also provides a control method for a two-stage heat pump system using a multi-channel coil heat exchanger, comprising the following steps:

[0056] Single-stage heating mode: open the fourth valve 34, close the first valve 19, the second valve 23 and the third valve 29; start the energy circulation pump 31 and the primary heat pump 1, close the internal circulation pump 17 and the secondary heat pump 2, the first circulation loop and the sixth circulation loop work, at this time the primary heat pump starts heating and supplies heat to the outside through the multi-channel coil heat exchanger;

[0057] Two-stage heating mode: open the third valve 29 and close the fourth valve 34; start the energy supply circulation pump 31, the primary heat pump 1 and the secondary heat pump 4, and the secondary heat pump 4 absorbs the heat provided by the primary heat pump 1 through the multi-channel coil heat exchanger 9 and supplies heat to the outside through the secondary condenser 24 of the secondary heat pump 4;

[0058] In the two-stage heating mode, the energy storage / defrosting heating system 2 of the energy storage tank automatically operates according to the heating capacity of the primary heat pump 1 and the heat demand of the secondary heat pump 4:

[0059] When the heating capacity of the primary heat pump 1 is greater than the heat required by the secondary heat pump 4, that is, when it is detected that the temperature of the multichannel coil heat exchanger 9 exceeds the first set value of 45°C, the internal circulation pump 17 is started, the first valve 19 is opened, and the second valve 23 is closed. Part of the heat is absorbed by the first channel 13 of the multichannel coil heat exchanger 9 and stored in the energy storage tank 15, so as to avoid the primary heat pump 1 providing too much heat to impact the secondary heat pump 4 and the frequent start and stop of the primary heat pump 1;

[0060] When the heating capacity of the primary heat pump 1 is equal to the heat required by the secondary heat pump 4, that is, when the temperature of the multi-channel coil heat exchanger 9 is detected to be between 40-45°C, the internal circulation pump 17 is stopped, the first valve 19 and the second valve 23 are closed, the energy storage tank 15 no longer absorbs heat, and the heating capacity of the primary heat pump 1 is fully supplied to the secondary heat pump 4;

[0061] When the heating capacity of the primary heat pump 1 cannot meet the heat required by the secondary heat pump 4, that is, when it is detected that the temperature of the multi-channel coil heat exchanger 9 is lower than the second set value of 40°C, the internal circulation pump 17 is started, the second valve 23 is opened, the first valve 19 is closed, and the energy storage tank 15 releases the stored heat to jointly heat the secondary heat pump 4 with the primary heat pump 1, so as to ensure that the secondary heat pump 4 obtains sufficient heat to work normally;

[0062] When the heating capacity of the primary heat pump 1 is insufficient under extreme environmental conditions, that is, when the temperature of the multi-channel coil heat exchanger 9 is detected to be lower than the third set value of 35°C, the electric heating in the energy storage water tank 15 can be started to supplement part of the heat to ensure the heat required for the normal operation of the secondary heat pump 4;

[0063] Cooling mode: open the fourth valve 34, close the third valve 29; start the energy circulation pump 31 and the primary heat pump 1, close the internal circulation pump 17, the first valve 19 and the second valve 23, and stop the operation of the secondary heat pump 4; the first circulation loop and the sixth circulation loop work; at this time, the primary heat pump 1 starts the cooling work and supplies cold air to the outside through the multi-channel coil heat exchanger 9;

[0064] Defrosting mode: start the internal circulation pump 17, open the first valve 19, close the second valve 23, start the defrosting working mode of the first-level heat pump 1, the third valve 29 and the fourth valve 34 remain in the state before defrosting, and the energy storage water tank 15 stores heat and provides it to the first-level heat pump 1 as a defrosting heat source through the multi-channel coil heat exchanger 9 in the second circulation loop; when the heat of the energy storage water tank 15 is insufficient, start the electric heater in the energy storage water tank 15 to supplement part of the heat to ensure the heat required for defrosting of the first-level heat pump 1. In this mode, the operation of the energy supply circulation pump 31 and the second-level heat pump 4 is stopped, and the system stops supplying heat to the outside.

[0065] Furthermore, in the single-stage heating mode or the two-stage heating mode, the flow direction of the refrigerant in the adjacent channels of the multi-channel coil heat exchanger 9 is opposite. That is, the flow direction of the refrigerant in the adjacent channels of the multi-channel coil heat exchanger is countercurrent, which can ensure higher heat exchange efficiency.

[0066] The heating capacity of the primary heat pump 1 and the heat requirement of the secondary heat pump 4 are determined by the following temperature tests:

[0067] A temperature sensor is provided on the multichannel coil heat exchanger to detect the temperature inside the multichannel coil heat exchanger; the detected temperature inside the multichannel coil heat exchanger is compared with the first set value, the second set value and the third set value, and the comparison result is as follows:

[0068] When it is detected that the temperature of the multi-channel coil heat exchanger exceeds the first set value, it is determined that the heating capacity of the primary heat pump is greater than the heat required by the secondary heat pump;

[0069] When it is detected that the temperature of the multi-channel coil heat exchanger is between the first set value and the second set value, it is determined that the heating capacity of the primary heat pump is equivalent to the heat required by the secondary heat pump;

[0070] When it is detected that the temperature of the multi-channel coil heat exchanger is less than the second set value, it is determined that the heating capacity of the primary heat pump cannot meet the heat required by the secondary heat pump;

[0071] When it is detected that the temperature of the multi-channel coil heat exchanger is less than the third set value, it is determined that the heating capacity of the primary heat pump is insufficient.

[0072] Preferably, the first setting value is 43-47°C, the second setting value is 39-42°C, and the third setting value is 33-38°C.

[0073] The utility model adopts a two-stage heat pump that realizes two-stage compression with dual compressors, and can automatically operate in single or double stages. The two-stage heat pumps of the two-stage heat pump system are independent heat pumps, which can be connected in series to operate in a two-stage mode, or can be operated in a single-stage mode with the first-stage heat pump running and the second-stage heat pump stopped. When the single-stage mode is operated, external heating or cooling can be realized, and when the two-stage mode is operated, external heating can be realized. When the system is operated in the two-stage mode, the secondary heat pump directly absorbs the heat provided by the primary heat pump through the multi-channel coil heat exchanger, and provides high-temperature heat to the outside, so as to realize efficient operation. When the system is operated in the two-stage mode, the energy storage tank energy storage system can store or release heat according to the heating capacity of the primary heat pump and the heat required by the secondary heat pump, so as to ensure the stable operation of the heat pump system.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-stage heat pump system using a multi-channel coil heat exchanger, characterized in that: Including primary heat pump, energy storage / defrosting heating system of energy storage / discharge water tank, heating system of energy storage / discharge water tank, secondary heat pump, system two-stage operation heating circuit, system single-stage operation heating / cooling circuit; The primary heat pump comprises a primary compressor, the outlet of the primary compressor is connected to the second channel inlet of the multichannel coil heat exchanger through a four-way reversing valve, the second channel outlet of the multichannel coil heat exchanger is connected to the primary evaporator through a primary throttling device, and the primary evaporator is connected to the inlet of the primary compressor through the four-way reversing valve to form a first circulation loop; The energy storage / defrosting heating system of the energy storage / release water tank comprises a first channel of a multi-channel coil heat exchanger, the first channel outlet of the multi-channel coil heat exchanger is connected to the energy storage / release water tank through a first pipeline, the energy storage / release water tank is connected to an internal circulation pump through a second pipeline, the internal circulation pump is connected to a first valve through a third pipeline, the first valve is connected to a fourth pipeline, and the fourth pipeline is connected to the first channel inlet of the multi-channel coil heat exchanger to form a second circulation loop; The energy storage and release water tank heating system comprises a fourth channel of the multi-channel coil heat exchanger, wherein the fourth channel outlet of the multi-channel coil heat exchanger is sequentially connected to a fifth pipeline, an energy storage and release water tank, an internal circulation pump, a second valve and a fourth channel inlet of the multi-channel coil heat exchanger to form a third circulation loop; The secondary heat pump comprises a secondary condenser, wherein the first flow channel outlet of the secondary condenser is sequentially connected to the secondary throttling device, the third channel of the multi-channel coil heat exchanger, the secondary compressor and the first flow channel inlet of the secondary condenser to form a fourth circulation loop; The dual-stage operation heating circuit of the system includes a second flow channel of the secondary condenser, the outlet of the second flow channel of the secondary condenser is connected to the energy supply outlet pipe, and the inlet of the second flow channel of the secondary condenser is connected to the energy supply return pipe through the third valve, the sixth pipeline and the energy supply circulation pump in sequence to form a fifth circulation circuit; The single-stage heating / cooling loop of the system includes an energy supply circulation pump, which is connected to the fourth valve through the seventh pipeline, and the fourth valve is connected to the first channel inlet of the multi-channel coil heat exchanger through the eighth pipeline. The first channel outlet of the multi-channel coil heat exchanger is connected to the ninth pipeline through the energy storage and release water tank, and the ninth pipeline is connected to the energy supply water outlet pipe through a check valve to form a sixth circulation loop.

2. The two-stage heat pump system using a multi-channel coil heat exchanger according to claim 1, characterized in that: The first pipeline is connected to the fifth pipeline; the fourth pipeline is connected to the eighth pipeline; the second pipeline is connected to the ninth pipeline; and the seventh pipeline is connected to the sixth pipeline.

3. The two-stage heat pump system using a multi-channel coil heat exchanger according to claim 1, characterized in that: The multi-channel coil heat exchanger has four channels, namely a first channel, a second channel, a third channel and a fourth channel. The second channel is arranged around the first channel, the third channel is arranged around the second channel, and the fourth channel is arranged around the third channel. The first channel and the fourth channel are water channel heat exchange channels, the second channel is a primary heat pump refrigerant heat exchange channel, and the third channel is a secondary heat pump refrigerant heat exchange channel.

4. The two-stage heat pump system using a multi-channel coil heat exchanger according to claim 1, characterized in that: The first valve, the second valve, the third valve and the fourth valve are electric valves.

5. The two-stage heat pump system using a multi-channel coil heat exchanger according to any one of claims 1 to 4, characterized in that: An electric heater is arranged in the energy storage water tank.

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