Combined energy utilization system of six-pipe heat pump and its control method

Abstract

The present invention relates to a combined energy utilization system of a six-pipe heat pump and a control method thereof, which solves the deficiencies of the prior art. It includes n heat exchange towers, n six-pipe heat pumps, an air-conditioning heating system, an air-conditioning cooling system and a number of water tanks. In each six-pipe heat pump, the evaporation refrigeration circuit pipe is connected to the heat exchange tower through a heat exchange tower pipeline with an evaporation water pump, and the evaporation refrigeration circuit pipe is also connected to the air-conditioning cooling system through a cooling compression pipeline with a chilled water pump. An evaporation refrigeration heat exchange plate is arranged between the heat exchange tower pipeline and the cooling compression pipeline; in each six-pipe heat pump, the condensation heating circuit pipe is connected to the heat exchange tower through a condensation heating pipeline equipped with a condensation water pump; controllable valves are arranged on the heat exchange tower pipeline, the cooling compression pipeline, the total heat recovery pipeline, the heating pipeline and the condensation heating pipeline.

Description

Technical Field

[0001] The present invention belongs to an energy utilization system of a heat pump and its control method, and particularly relates to a combined energy utilization system of a six-pipe heat pump and its control method. Background Art

[0002] In 1982, the first multi-functional heat pump in the industry was designed, manufactured and launched by the Italian company Climaveneta. Such products generally have the advantages of simultaneously utilizing the hot and cold ends of the refrigeration cycle, high energy efficiency, greatly simplified air-conditioning systems, small floor areas, and can effectively reduce or even eliminate boilers. With the further development of multi-functional heat pumps, two-pipe heat pumps and four-pipe heat pumps have begun to be widely used in the industry. Furthermore, the application of six-pipe heat pumps in forms such as four-pipe chilled water and hot water units plus two-pipe high-temperature hot water modules has emerged. However, there are still many weaknesses in the application of six-pipe heat pumps, especially for the application of relatively complex systems. Due to the lack of reasonable arrangements, the energy efficiency level is reduced, and the inherent advantages of six-pipe heat pumps cannot be maximally utilized. Therefore, in the market, the energy utilization systems mainly rely on two-pipe heat pumps and four-pipe heat pumps. It is imperative to develop a combined energy utilization system of a six-pipe heat pump and its control method that can reasonably utilize the inherent characteristics of six-pipe heat pumps and improve energy utilization efficiency.

[0003] For example, with the application number: 201510631865.2 and the application date: September 29, 2015

[0004] A dual header four-pipe air conditioning system with a heat pump unit coupled to a chiller and its usage method. The main unit adopts a combination form of a chiller and a heat pump unit. A two-pipe water system is used in areas with cooling loads in summer and only heating loads in winter, and a four-pipe water system is used in areas with cooling loads in summer and both cooling and heating loads in winter, so as to achieve cooling in summer, heating in some areas in winter, and simultaneous cooling and heating in some areas. The process of the traditional two-pipe air conditioning system constructed by a chiller + heat pump unit is improved, and a dual header four-pipe air conditioning system with a heat pump unit coupled to a chiller is constructed by separately setting air conditioning cold and hot water headers and switching valves. It includes a chiller, a heat pump unit, an outdoor heat exchange system, an air conditioning cold water circulation pump, an air conditioning cold water system pressure stabilizing device, a cold water header, a cold water distributor, an air conditioning cold and hot water circulation pump, an air conditioning hot water system pressure stabilizing device, a hot water header, a hot water distributor, and switching valves; two branch pipes are provided at the end return water of the two-pipe air conditioning area. One is the end cold water return of the two-pipe air conditioning area, which is connected to the cold water header, and the other is the end hot water return of the two-pipe air conditioning area, which is connected to the hot water header. The two branch pipes are respectively provided with a second valve and a fourth valve for switching; the end cold water return of the four-pipe air conditioning area is connected to the cold water header, and the end hot water return of the four-pipe air conditioning area is connected to the hot water header; it can be seen that the existing technology still mainly uses two-pipe heat pumps and four-pipe heat pumps as the energy-using systems. It is imperative to develop a combined energy-using system for six-pipe heat pumps and its control method that can reasonably utilize the inherent characteristics of six-pipe heat pumps and improve the energy-using efficiency. Summary of the Invention

[0005] Aiming at the problem that in the application of the existing technology for relatively complex systems, due to the lack of reasonable arrangements, the energy efficiency level is reduced and the inherent advantages of six-pipe heat pumps cannot be maximally utilized, the present invention provides a combined energy-using system for six-pipe heat pumps and its control method.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: A combined energy-using system for six-pipe heat pumps includes n heat exchange towers, n six-pipe heat pumps, an air conditioning heating system, an air conditioning cooling system, and several water tanks. All the heat exchange towers are connected to each other. Each water tank corresponds to one six-pipe heat pump. Each six-pipe heat pump includes a wide-temperature heat pump compressor and an evaporation refrigeration circuit pipe, a condensation total heat recovery circuit pipe, and a condensation heating circuit pipe that are connected to each other. The connected evaporation refrigeration circuit pipe, condensation total heat recovery circuit pipe, and condensation heating circuit pipe are driven by the wide-temperature heat pump compressor.

[0007] In each six-pipe heat pump, the evaporation refrigeration circuit pipe is connected to the heat exchange tower through a heat exchange tower pipeline with an evaporation water pump, and the evaporation refrigeration circuit pipe is also connected to the air conditioning cooling system through a cooling compression pipeline with a chilled water pump. An evaporation refrigeration heat exchange plate is arranged between the heat exchange tower pipeline and the cooling compression pipeline.

[0008] In the six-pipe heat pump corresponding to the water tank, the condensation total heat recovery circuit pipe is connected to the water tank through a total heat recovery pipeline equipped with a total heat recovery water pump.

[0009] In the six-pipe heat pump not corresponding to the water tank, the condensation total heat recovery circuit pipe is connected to the air-conditioning heating system through a heating pipeline equipped with a heating water pump, and a total heat recovery heat exchange plate is arranged between the total heat recovery pipeline and the heating pipeline.

[0010] In each six-pipe heat pump, the condensation heating circuit pipe is connected to the heat exchange tower through a condensation heating pipeline equipped with a condensation water pump.

[0011] Controllable valves are arranged on the heat exchange tower pipeline, the cooling compression pipeline, the total heat recovery pipeline, the heating pipeline and the condensation heating pipeline.

[0012] According to the structure of the six-pipe heat pump, the present invention respectively arranges controllable heat exchange tower pipelines, cooling compression pipelines, total heat recovery pipelines, heating pipelines and condensation heating pipelines, enabling them to make reasonable conduction and cut-off selections according to different working conditions, and capable of generating better heating, cooling, self-balancing and other working conditions. By adjusting the states between the pipelines, it is completely possible to achieve: the cooling working state under the automatic balance of cooling and heating of the double heat exchange tower heating and air-conditioning operation state and the cooling working state under the automatic balance of cooling and heating of the single heat exchange tower heating and air-conditioning operation state. In this way, the most reasonable and energy-efficient control operation can be realized in different environments, and the maximum effect of the six-pipe wide-temperature heat pump can be exerted to the greatest extent. The six-pipe heat pump in the present invention is preferably a six-pipe wide-temperature heat pump, but those skilled in the art should recognize that when other heat pumps are selected for equivalent replacement, the corresponding functions can also be achieved in a degraded form. In the present invention, n is a sequence number. For example, for the No. 1 water tank, the corresponding valves are valve K11, valve K11', valve K21, valve K21', etc., where valve K11 and valve K11' are associated valves, and valve K21 and valve K21' are associated valves.

[0013] Preferably, the output end of the evaporation refrigeration circuit pipe in the n - tube six - pipe heat pump is connected to the first end of the valve Zn, the second end of the valve Zn is connected to the input end of the n - th heat exchange tower, the output end of the n - th heat exchange tower is connected to the first end of the valve Zn', the second end of the valve Zn' is connected to the input end of the n - th evaporation water pump, and the output end of the n - th evaporation water pump is connected to the input end of the evaporation refrigeration circuit pipe in the n - tube six - pipe heat pump; the output end of the evaporation refrigeration circuit pipe in the n - tube six - pipe heat pump is connected to the first end of the valve K1n, the second end of the valve K1n is connected to the input end of the air - conditioning cooling system, the output end of the air - conditioning cooling system is connected to the input end of the chilled - water supply pump, the output end of the chilled - water supply pump is connected to the first end of the valve K1n', and the second end of the valve K1n' is connected to the input end of the evaporation refrigeration circuit pipe in the n - tube six - pipe heat pump; the output end of the chilled - water supply pump is connected to the first input end of the n - th evaporation refrigeration heat - exchange plate through the valve K2n', the first output end of the n - th evaporation refrigeration heat - exchange plate is connected to the input end of the air - conditioning cooling system, the second input end of the n - th evaporation refrigeration heat - exchange plate is connected to the input end of the n - th evaporation water pump, the second output end of the n - th evaporation refrigeration heat - exchange plate is connected to the output end of the evaporation refrigeration circuit pipe in the n - tube six - pipe heat pump through the valve K2n. The valve K1n' and the valve K1n are interlocking valves, and the valve K2n' and the valve K2n are interlocking valves.

[0014] Preferably, for the n - tube six - pipe heat pump corresponding to a water tank, the output end of the condensation total - heat recovery circuit pipe is connected to the first end of the valve Rn, the second end of the valve Rn is connected to the outlet of the corresponding water tank, the outlet of the corresponding water tank is connected to the input end of the corresponding n - th total - heat recovery water pump, the output end of the n - th total - heat recovery water pump is connected to the input end of the condensation total - heat recovery circuit pipe in the n - tube six - pipe heat pump corresponding to the water tank, the output end of the condensation total - heat recovery circuit pipe in the n - tube six - pipe heat pump corresponding to the water tank is connected to the second input end of the n - th total - heat recovery heat - exchange plate, the second output end of the n - th total - heat recovery heat - exchange plate is connected to the input end of the n - th total - heat recovery water pump, the first input end of the n - th total - heat recovery heat - exchange plate is connected to the output end of the n - th heating water pump, the input end of the n - th heating water pump is connected to the output end of the air - conditioning heating system, the first output end of the n - th total - heat recovery heat - exchange plate is connected to the input end of the air - conditioning heating system. The valve Nn is connected to the corresponding water tank and also to the output end of the condensation total - heat recovery circuit pipe.

[0015] Preferably, for the n - tube six - pipe heat pump not corresponding to a water tank, the output end of the condensation total - heat recovery circuit pipe is connected to the input end of the air - conditioning heating system, the output end of the air - conditioning heating system is connected to the input end of the n - th heating water pump, and the output end of the n - th heating water pump is connected to the input end of the condensation total - heat recovery circuit pipe in the n - tube six - pipe heat pump not corresponding to the water tank.

[0016] Preferably, the output end of the condensation heating circuit pipe in the n - th six - pipe heat pump is connected to the input end of the n - th heat exchange tower through the valve Tn, the output end of the n - th heat exchange tower is connected to the input end of the n - th condensation water pump, and the output end of the n - th condensation water pump is connected to the input end of the condensation heating circuit pipe in the n - th six - pipe heat pump.

[0017] Preferably, flow meters and / or temperature sensors are arranged on the heat exchange tower pipeline, the cooling compression pipeline, the total heat recovery pipeline, the heating pipeline and the condensation heating pipeline.

[0018] Preferably, a valve Bn is arranged at the inlet of the n - th water tank. The second end of the valve Rn is connected to the inlet of the corresponding water tank through the valve Bn. A valve Cn is arranged at the outlet of the n - th water tank. The outlet of the n - th water tank is connected to the input end of the corresponding n - th total heat recovery water pump through the valve Cn. The water supply end of the water tank supplies water to the hot water supply system through the valve An.

[0019] A control method for the combined energy - using system of a six - pipe heat pump, which is applicable to the combined energy - using system of the six - pipe heat pump as described above. According to the control instruction, the combined energy - using system of the six - pipe heat pump enters the corresponding working state and executes the corresponding working steps. The working states include:

[0020] Realized by using the condensation heating circuit pipe and adjusting the corresponding valves: full - load air - conditioning heating working state, air - conditioning heating load unloading working state, air - conditioning heating and domestic hot water heating working state, domestic hot water heating and air - conditioning heating / heat pump non - stop switching working state, and temperature - rising working state in the cooling and heating automatic balance of cold and heat operation state under air - conditioning heating;

[0021] Realized by using the condensation total heat recovery circuit pipe and adjusting the corresponding valves: full - load domestic hot water heating working state, full - load domestic hot water heating unloading working state, domestic hot water running and heating working state, and full - cold recovery for air - conditioning cooling working state under domestic hot water heating;

[0022] Realized by using the evaporation refrigeration circuit pipe and adjusting the corresponding valves: full - load air - conditioning cooling working state, full - load air - conditioning cooling unloading working state, total heat recovery for making hot water working state under air - conditioning cooling, temperature - decreasing working state in the single heat exchange tower heating and air - conditioning automatic balance of cold and heat operation state, and temperature - decreasing working state in the double heat exchange tower heating and air - conditioning automatic balance of cold and heat operation state.

[0023] The starting steps of the temperature - rising working state in the cooling and heating automatic balance of cold and heat operation state are as follows:

[0024] Step E1, when the detected water temperature has reached the set low - temperature value, select a six - pipe heat pump in which an evaporation refrigeration circuit pipe is connected to the heat exchange tower to form a loop and the condensation heating circuit pipe is connected to the air - conditioning heating system.

[0025] Step E2: Cut off the connection between the condensation heating circuit pipe and the air-conditioning heating system, and connect the input end of the evaporation refrigeration circuit pipe in the selected six-pipe heat pump to the output end of the evaporation refrigeration circuit pipe through the evaporation refrigeration heat exchange plate to form a circuit.

[0026] Step E3: The air-conditioning cooling system cools down through the evaporation refrigeration heat exchange plate.

[0027] The full cold recovery in the case of domestic hot water heating and the start-up steps for the air-conditioning cooling operation state are as follows:

[0028] Step I1: In the nth six-pipe heat pump with a water tank, the condensation total heat recovery circuit pipe is connected to the corresponding water tank, and a circuit is formed between the output end and the input end of the evaporation refrigeration circuit pipe through the evaporation refrigeration heat exchange plate.

[0029] Step I2: The air-conditioning cooling system cools down through the evaporation refrigeration heat exchange plate.

[0030] Preferably, the start-up steps for the cooling operation state in the automatic balance of cooling and heating of a single heat exchange tower for heating and air-conditioning are as follows:

[0031] Step M1: When it is detected that the air-conditioning heating temperature is lower than the set temperature, the evaporation refrigeration circuit pipes in all six-pipe heat pumps are connected to the air-conditioning cooling system, and the condensation heating circuit pipe in one six-pipe heat pump is connected to the heat exchange tower.

[0032] Step M2: Select the condensation total heat recovery circuit pipe in another six-pipe heat pump and connect it to the air-conditioning heating system through the corresponding frequency conversion energy-saving operation heating water pump.

[0033] The start-up steps for the cooling operation state in the automatic balance of cooling and heating of a double heat exchange tower for heating and air-conditioning are as follows:

[0034] Step N1: When it is detected that the air-conditioning heating temperature is lower than the set temperature, the evaporation refrigeration circuit pipes in all six-pipe heat pumps are connected to the air-conditioning cooling system, and the condensation heating circuit pipe in the six-pipe heat pump is connected to the heat exchange tower.

[0035] Step N2: Select the condensation total heat recovery circuit pipe in one six-pipe heat pump and connect it to the air-conditioning heating system through the corresponding frequency conversion energy-saving operation heating water pump.

[0036] The substantial effect of the present invention is as follows: According to the structure of the six-pipe heat pump, the present invention respectively configures controllable heat exchange tower pipelines, cooling compression pipelines, total heat recovery pipelines, heating pipelines, and condensation heating pipelines, enabling it to make reasonable conduction and cut-off selections according to different working conditions, and being able to produce better heating, cooling, self-balancing and other working conditions. By adjusting the states between the pipelines, it is completely possible to achieve: the cooling working state under the automatic balance of cooling and heating of the dual heat exchange tower heating and air conditioning operation state and the cooling working state under the automatic balance of cooling and heating of the single heat exchange tower heating and air conditioning operation state. Through this form, the most reasonable and energy-efficient control operation can be realized in different environments, and the maximum effect of the six-pipe wide-temperature heat pump can be exerted to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the overall structure of this embodiment;

[0038] Figure 2 is a schematic diagram of the structure of the six-pipe heat pump in this embodiment;

[0039] Figure 3 is an enlarged schematic diagram of a part of the structure in this embodiment;

[0040] Figure 4 is an enlarged schematic diagram of a part of the structure in this embodiment;

[0041] Figure 5 is an enlarged schematic diagram of a part of the structure in this embodiment;

[0042] Figure 6 is an enlarged schematic diagram of a part of the structure in this embodiment;

[0043] Figure 7 is a schematic diagram of the conduction state of the full-load air conditioning heating working state in this embodiment;

[0044] Figure 8 is a schematic diagram of the conduction state of the air conditioning heating load unloading working state in this embodiment;

[0045] Figure 9 is a schematic diagram of the conduction state of the air conditioning heating and domestic hot water heating working state in this embodiment;

[0046] Figure 10 is a schematic diagram of the conduction state of the domestic hot water heating and air conditioning heating / heat pump non-stop switching working state in this embodiment;

[0047] Figure 11 is a schematic diagram of the conduction state of the heating working state under the automatic balance of cooling and heating of the cooling air conditioner in the case of air conditioning heating in this embodiment;

[0048] Figure 12 is a schematic diagram of the conduction state of the full-load domestic hot water heating working state in this embodiment;

[0049] Figure 13 Schematic diagram of the conduction of the full-load domestic hot water heating unloading working state in this embodiment;

[0050] Figure 14 Schematic diagram of the conduction of the domestic hot water operation heating working state in this embodiment;

[0051] Figure 15 Schematic diagram of the conduction of the full-cooling recovery for air-conditioning cooling working state in the case of domestic hot water heating in this embodiment;

[0052] Figure 16 Schematic diagram of the conduction of the full-load air-conditioning cooling working state in this embodiment;

[0053] Figure 17 Schematic diagram of the conduction of the full-load air-conditioning cooling unloading working state in this embodiment;

[0054] Figure 18 Schematic diagram of the conduction of the full-heat recovery for domestic hot water production working state in the case of air-conditioning cooling in this embodiment;

[0055] Figure 19 Schematic diagram of the conduction of the cooling working state in the automatic balance of cooling and heating energy operation of a single heat exchange tower for heating and air-conditioning in this embodiment;

[0056] Figure 20 Schematic diagram of the conduction of the cooling working state in the automatic balance of cooling and heating energy operation of a double heat exchange tower for heating and air-conditioning in this embodiment;

[0057] Figure 21 Schematic diagram of the enlarged structure of the heat exchange tower part in this embodiment;

[0058] Figure 22 Schematic diagram of the enlarged structure of the water tank part in this embodiment.

[0059] In the figure: 1, chilled water supply pump; 2, evaporation water pump; 3, condensate water pump; 4, heating water pump; 5, full-heat recovery water pump; 6, evaporation refrigeration circuit pipe; 7, condensate full-heat recovery circuit pipe; 8, condensate heating circuit pipe; 9, wide-temperature heat pump compressor; 11, heat exchange tower pipeline; 12, cooling compression pipeline; 13, full-heat recovery pipeline; 14, heating pipeline; 15, condensate heating pipeline; 1A0, six-pipe heat pump; 1A1, air-conditioning heating system; 1A2, air-conditioning cooling system; 1A3, water tank; 1A4, full-heat recovery heat exchange plate. Specific embodiments

[0060] The following will further specifically describe the specific embodiments of the present invention through specific embodiments and in combination with the accompanying drawings.

[0061] Embodiment 1:

[0062] A combined energy utilization system for a six-pipe heat pump (see Appendix Figure 1 to Appendix Figure 6 and Appendix Figure 21 , 22 ), which includes n heat exchange towers with heat exchange fans, n six-pipe heat pumps 1A0, an air-conditioning heating system 1A1, an air-conditioning cooling system 1A2, and several water tanks 1A3. All the heat exchange towers are interconnected. Each water tank corresponds to a six-pipe heat pump. Each six-pipe heat pump includes a wide-temperature heat pump compressor 9 and an evaporation refrigeration circuit pipe 6, a condensation total heat recovery circuit pipe 7, and a condensation heating circuit pipe 8 that are interconnected. The interconnected evaporation refrigeration circuit pipe, condensation total heat recovery circuit pipe, and condensation heating circuit pipe are driven by the wide-temperature heat pump compressor.

[0063] In each six-pipe heat pump, the evaporation refrigeration circuit pipe is connected to the heat exchange tower through a heat exchange tower pipeline 11 with an evaporation water pump 2, and the evaporation refrigeration circuit pipe is also connected to the air-conditioning cooling system through a cooling compression pipeline 12 with a chilled water supply pump 1. An evaporation refrigeration heat exchange plate is arranged between the heat exchange tower pipeline and the cooling compression pipeline.

[0064] In the six-pipe heat pump corresponding to the water tank, the condensation total heat recovery circuit pipe is connected to the water tank through a total heat recovery pipeline 13 with a total heat recovery water pump 5.

[0065] In the six-pipe heat pump not corresponding to the water tank, the condensation total heat recovery circuit pipe is connected to the air-conditioning heating system through a heating pipeline 14 with a heating water pump 4. A total heat recovery heat exchange plate 1A4 is arranged between the total heat recovery pipeline and the heating pipeline.

[0066] In each six-pipe heat pump, the condensation heating circuit pipe is connected to the heat exchange tower through a condensation heating pipeline 15 with a condensation water pump 3. Controllable valves are arranged on the heat exchange tower pipeline, the cooling compression pipeline, the total heat recovery pipeline, the heating pipeline, and the condensation heating pipeline. Among them, the heat exchange tower pipeline and the condensation heating pipeline are multiplexed pipelines.

[0067] The output end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump is connected to the first end of the valve Zn, the second end of the valve Zn is connected to the input end of the nth heat exchange tower, the output end of the nth heat exchange tower is connected to the first end of the valve Zn', the second end of the valve Zn' is connected to the input end of the nth evaporation water pump, and the output end of the nth evaporation water pump is connected to the input end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump; the output end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump is connected to the first end of the valve K1n, the second end of the valve K1n is connected to the input end of the air-conditioning cooling system, the output end of the air-conditioning cooling system is connected to the input end of the chilled water pump, the output end of the chilled water pump is connected to the first end of the valve K1n', and the second end of the valve K1n' is connected to the input end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump; the output end of the chilled water pump is connected to the first input end of the nth evaporation refrigeration heat exchange plate through the valve K2n', the first output end of the nth evaporation refrigeration heat exchange plate is connected to the input end of the air-conditioning cooling system, the second input end of the nth evaporation refrigeration heat exchange plate is connected to the input end of the nth evaporation water pump, and the second output end of the nth evaporation refrigeration heat exchange plate is connected to the output end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump through the valve K2n. The valve K1n' and the valve K1n are interlocking valves, and the valve K2n' and the valve K2n are interlocking valves. For the nth six-pipe heat pump corresponding to a water tank, the output end of the condensation total heat recovery circuit pipe is connected to the first end of the valve Rn, the second end of the valve Rn is connected to the outlet of the corresponding water tank, the inlet of the corresponding water tank is connected to the input end of the corresponding nth total heat recovery water pump, the output end of the nth total heat recovery water pump is connected to the input end of the condensation total heat recovery circuit pipe in the nth six-pipe heat pump corresponding to the water tank, the output end of the condensation total heat recovery circuit pipe in the nth six-pipe heat pump corresponding to the water tank is connected to the second input end of the nth total heat recovery heat exchange plate, the second output end of the nth total heat recovery heat exchange plate is connected to the input end of the nth total heat recovery water pump, the first input end of the nth total heat recovery heat exchange plate is connected to the output end of the nth heating water pump, the input end of the nth heating water pump is connected to the output end of the air-conditioning heating system, the first output end of the nth total heat recovery heat exchange plate is connected to the input end of the air-conditioning heating system, the valve Nn is connected to the corresponding water tank and also to the output end of the condensation total heat recovery circuit pipe. For the nth six-pipe heat pump without a corresponding water tank, the output end of the condensation total heat recovery circuit pipe is connected to the input end of the air-conditioning heating system, the output end of the air-conditioning heating system is connected to the input end of the nth heating water pump, and the output end of the nth heating water pump is connected to the input end of the condensation total heat recovery circuit pipe in the nth six-pipe heat pump without a corresponding water tank. The output end of the condensation heating circuit pipe in the nth six-pipe heat pump is connected to the input end of the nth heat exchange tower through the valve Tn, the output end of the nth heat exchange tower is connected to the input end of the nth condensation water pump, and the output end of the nth condensation water pump is connected to the input end of the condensation heating circuit pipe in the nth six-pipe heat pump. Flow meters and / or temperature sensors are arranged on the heat exchange tower pipeline, the cooling compression pipeline, the total heat recovery pipeline, the heating pipeline and the condensation heating pipeline.A valve Bn is provided at the inlet of the nth water tank. The second end of the valve Rn is connected to the inlet of the corresponding water tank through the valve Bn. A valve Cn is provided at the outlet of the nth water tank. The outlet of the nth water tank is connected to the input end of the corresponding nth total heat recovery water pump through the valve Cn. The water supply end of the water tank supplies water to the hot water supply system through the valve An. In this embodiment, n is a sequence number. For example, for the 1st water tank, the corresponding valves are valve K11, valve K11', valve K21, valve K21', etc. Among them, valve K11 and valve K11' are associated valves, and valve K21 and valve K21' are associated valves.

[0068] A control method for a combined energy utilization system of a six-pipe heat pump is applicable to the combined energy utilization system of the six-pipe heat pump as described above. According to the control instruction, the combined energy utilization system of the six-pipe heat pump enters the corresponding working state and executes the corresponding working steps. The working states include,

[0069] Realized by using the condensation heat supply circuit pipe and adjusting the corresponding valves: full-load air-conditioning heating working state, air-conditioning heating load unloading working state, air-conditioning heating and domestic hot water heating working state, domestic hot water heating and air-conditioning / heat pump non-stop switching working state, and heating-up working state in the cooling air-conditioning automatic balance of cooling and heating operation state during air-conditioning heating;

[0070] Realized by using the condensation total heat recovery circuit pipe and adjusting the corresponding valves: full-load domestic hot water heating working state, full-load domestic hot water heating unloading working state, domestic hot water operation heating working state, and full-cooling recovery for air-conditioning cooling working state during domestic hot water heating;

[0071] Realized by using the evaporation refrigeration circuit pipe and adjusting the corresponding valves: full-load air-conditioning cooling working state, full-load air-conditioning cooling unloading working state, full heat recovery for hot water production working state during air-conditioning cooling, cooling-down working state in the single heat exchange tower heating and air-conditioning automatic balance of cooling and heating operation state, and cooling-down working state in the double heat exchange tower heating and air-conditioning automatic balance of cooling and heating operation state.

[0072] Among them, the starting steps of the heating-up working state in the cooling air-conditioning automatic balance of cooling and heating operation state are as follows:

[0073] Step E1, when the detected water temperature has reached the set low temperature value, select a six-pipe heat pump with an evaporation refrigeration circuit pipe connected to the heat exchange tower to form a circuit and the condensation heat supply circuit pipe connected to the air-conditioning heating system;

[0074] Step E2, cut off the connection state between the condensation heat supply circuit pipe and the air-conditioning heating system, and connect the input end of the evaporation refrigeration circuit pipe in the selected six-pipe heat pump to the output end of the evaporation refrigeration circuit pipe through the evaporation refrigeration heat exchange plate to form a circuit;

[0075] Step E3, the air-conditioning cooling system cools down through the evaporative cooling heat exchange plate.

[0076] The full-cooling recovery in the case of domestic hot water heating and the start-up steps of the air-conditioning cooling working state are as follows:

[0077] Step I1, in the nth six-pipe heat pump corresponding to the water tank, the condensation total heat recovery loop pipe is connected to the corresponding water tank, and a loop is formed between the output end and the input end of the evaporative cooling loop pipe through the evaporative cooling heat exchange plate.

[0078] Step I2, the air-conditioning cooling system cools down through the evaporative cooling heat exchange plate.

[0079] The start-up steps of the cooling working state under the automatic balance of cooling and heating of the single heat exchange tower heating and air-conditioning are as follows:

[0080] Step M1: When it is detected that the air-conditioning heating temperature is lower than the set temperature, the evaporative cooling loop pipes in all six-pipe heat pumps are connected to the air-conditioning cooling system, and the condensation heating loop pipe in one six-pipe heat pump is connected to the heat exchange tower.

[0081] Step M2: Select the condensation total heat recovery loop pipe in another six-pipe heat pump to be connected to the air-conditioning heating system through the corresponding frequency conversion energy-saving operation heating water pump.

[0082] The start-up steps of the cooling working state under the automatic balance of cooling and heating of the double heat exchange tower heating and air-conditioning are as follows:

[0083] Step N1: When it is detected that the air-conditioning heating temperature is lower than the set temperature, the evaporative cooling loop pipes in all six-pipe heat pumps are connected to the air-conditioning cooling system, and the condensation heating loop pipes in the six-pipe heat pumps are connected to the heat exchange tower.

[0084] Step N2: Select the condensation total heat recovery loop pipe in one six-pipe heat pump to be connected to the air-conditioning heating system through the corresponding frequency conversion energy-saving operation heating water pump.

[0085] Taking 4 heat exchange towers, 2 supported water tanks and 4 six-pipe heat pumps, where the 1st and 2nd six-pipe heat pumps are correspondingly connected to the supported water tanks, the control method of this embodiment is specifically exemplified (see Appendix Figure 7 to Appendix Figure 20 ) as follows.

[0086] Control method for the full-load air-conditioning heating working state:

[0087] A-1. Receive the group control start-up instruction.

[0088] A-2. Start the 1st to 4th heating water pumps.

[0089] A-3. Close valves R1 and R2, open valves N1 and N2, start the No. 1 and No. 2 total heat recovery water pumps, and close valves K11, K21, K12, K22, K13, K23, K14, and K24;

[0090] A-4. Open valves Z1, Z1’, Z2, Z2’, Z3, Z3’, Z4, Z4’, T1, T2, T3, and T4, start the No. 1 evaporation water pump, No. 2 evaporation water pump, No. 3 evaporation water pump, No. 4 evaporation water pump, No. 1 heat exchange fan, No. 2 heat exchange fan, No. 3 heat exchange fan, and No. 4 heat exchange fan;

[0091] A-5. Start the compressor of the air-conditioning heating system.

[0092] Control method for the working state of air-conditioning heating load unloading:

[0093] B-1. Receive the group control shutdown instruction

[0094] B-2. The No. 4 six-pipe heat pump gradually unloads the operating load and shuts down the compressor. The operating load of the No. 3 six-pipe heat pump continues to decrease until the compressor is shut down. The No. 1 six-pipe heat pump and the No. 2 six-pipe heat pump gradually unload the operating load and shut down the compressor

[0095] B-3. Close the No. 4 heat exchange fan, No. 4 evaporation water pump, and T4 valve, close the No. 3 heat exchange fan, No. 3 evaporation water pump, and T3 valve, close the No. 2 heat exchange fan, No. 2 evaporation water pump, and T2 valve, close the No. 1 heat exchange fan, No. 1 evaporation water pump, and T1 valve,

[0096] B-4. Close the No. 4 air-conditioning heating water pump, the No. 3 air-conditioning heating water pump operates in the energy-saving frequency conversion state, close the No. 1 and No. 2 air-conditioning heating water pumps, close the No. 1 and No. 2 air-conditioning total heat recovery water pumps, open valves R1 and R2, and then close valves N1 and N2.

[0097] Control method for the working state of air-conditioning heating and domestic hot water heating:

[0098] C-1. When receiving the domestic hot water heating startup instruction and the water temperature of the No. 1 water tank is lower than the startup set temperature value, close valve A1, open valve B1, and send a startup instruction to the No. 1 total heat recovery heat pump;

[0099] C-2. Open valves Z1, Z1’, and T1, start the No. 1 heat exchange fan and evaporation water pump,

[0100] C-3. Close valve N1, open valve R1, and start the No. 1 total heat recovery water pump

[0101] C-4. Start the compressor.

[0102] Control method for the working state of domestic hot water heating and air-conditioning heating / heat pump non-stop switching:

[0103] D-1. When the target temperature value is greater than the shutdown temperature set value and there is a demand for air-conditioning heating, open valve N1.

[0104] D-2. Open the No. 1 air-conditioning heating water pump and close valve R1.

[0105] Control method for the heating working state of the cooling air-conditioning in the automatic balance of cooling and heating energy operation state of the air-conditioning heating:

[0106] E-1. The No. 3 and No. 4 six-pipe heat pumps operate in the heating mode.

[0107] E-2. When the chilled water temperature reaches the set low temperature value.

[0108] E-3. Open valves Z3, T3, start the No. 3 heat exchange fan, open valves K24, K24', start the No. 4 air-conditioning chilled water pump, E-4. Close valves K23, K23', close the No. 3 air-conditioning chilled water pump, close valves Z4, T4, and close the No. 4 heat exchange fan.

[0109] Control method for the full-load domestic hot water heating working state:

[0110] F-1. The water tank conducts self-inspection. It is possible to set any priority for the No. 1 water tank and the No. 2 water tank. Taking the No. 1 water tank as the priority for heating, open valve B1, close valve A1, and issue a heat pump start command. When the temperature rises to the set upper limit value of the water temperature.

[0111] F-2. Open valves Z1, Z1', T1, start the No. 1 heat exchange fan, the No. 1 evaporation water pump, open valves Z2, Z2', T2, start the No. 2 heat exchange fan, the No. 2 evaporation water pump.

[0112] F-3. Open valve R, start the No. 1 total heat recovery water pump, close valve N1, open valve R2, start the No. 2 total heat recovery water pump, close valve N2.

[0113] F-4. Start the No. 1 six-pipe heat pump compressor and start the No. 2 six-pipe heat pump compressor.

[0114] Control method for the full-load domestic hot water heating unloading working state:

[0115] Taking the initial heating of the No. 2 water tank as an example.

[0116] G-1. Open valve B2 and close valve A2.

[0117] G-2. Close valve B1, open valve A1, and the No. 1 water tank is put into operation.

[0118] G-3. When the temperature rises to the set upper limit value of the water temperature.

[0119] G-4. Issue a heat pump shutdown command.

[0120] Control method for the operating heating working state of domestic hot water:

[0121] H-1. When the upper temperatures of the No. 1 and 2 water tanks are lower than the lower limit of the set water temperature, open valve A1 and close valve B1.

[0122] H-2. Close valve A2 and open valve B2.

[0123] H-3. When the full-open feedback signal of valve B2 is obtained, send the start command for the six-pipe heat pump.

[0124] H-4. When the lower temperature of the No. 2 water tank rises to the set value, send the stop command for the six-pipe heat pump.

[0125] Control method for the full-cooling recovery for air-conditioning cooling working state in the case of domestic hot water heating:

[0126] I-1. Open valve K22’ and the No. 1 air-conditioning chilled water pump.

[0127] I-2. Open valve K22, close valve Z2, turn off the No. 1 heat exchange fan, and close valve T1.

[0128] Control method for the full-load air-conditioning cooling working state:

[0129] J-1. Receive the group control start command.

[0130] J-2. Open valves K11, K11’, K12, K12’, K13, K13’, K14, K14’ and start the No. 1, 2, 3, and 4 air-conditioning chilled water pumps.

[0131] J-3. Close valves Z1, Z1’, Z2, Z2’, Z3, Z3’, Z4, Z4’.

[0132] J-4. Open valves T1, T2, T3, T4 and start the No. 1 evaporation water pump, the No. 1 heat exchange fan, the No. 2 evaporation water pump, the No. 2 heat exchange fan, the No. 3 evaporation water pump, the No. 3 heat exchange fan, the No. 4 evaporation water pump, and the No. 4 heat exchange fan.

[0133] J-5. The No. 1 six-pipe heat pump compressor, the No. 2 six-pipe heat pump compressor, the No. 3 six-pipe heat pump compressor, and the No. 4 six-pipe heat pump compressor.

[0134] Control method for the full-load air-conditioning cooling unloading working state:

[0135] K-1. Receive the group control stop command.

[0136] K-2. First unload the operating load and shut down the No. 1 six-pipe heat pump compressor, the No. 2 six-pipe heat pump compressor, the No. 3 six-pipe heat pump compressor, and the No. 4 six-pipe heat pump compressor.

[0137] K-3. Turn off the No. 1 heat exchange fan, No. 1 condensate pump, and valve T1; turn off the No. 2 heat exchange fan, No. 2 condensate pump, and valve T2; turn off the No. 3 heat exchange fan, No. 3 condensate pump, and valve T3; turn off the No. 4 heat exchange fan, No. 4 condensate pump, and valve T4.

[0138] K-4. Turn off the No. 1 air-conditioning chilled water pump, No. 2 air-conditioning chilled water pump, and No. 3 air-conditioning chilled water pump. The No. 4 chilled water pump operates with frequency conversion.

[0139] Control method for the working state of full heat recovery hot water production under air-conditioning cooling:

[0140] L-1. Receive the instruction for domestic hot water heating.

[0141] L-2. Open valve R1 and start the No. 1 full heat recovery water pump.

[0142] L-3. Turn off the No. 1 heat exchange fan, No. 1 condensate pump, and close valve T1.

[0143] Control method for the cooling working state under the automatic balance of cooling and heating in the single heat exchange tower for heating and air-conditioning operation:

[0144] M-1. When the air-conditioning heating temperature is lower than the set temperature,

[0145] M-2. Turn off the No. 3 heat exchange fan, No. 3 condensate pump, and close valve T3.

[0146] M-3. The No. 3 heating water pump operates with frequency conversion for energy saving.

[0147] Control method for the cooling working state under the automatic balance of cooling and heating in the double heat exchange tower for heating and air-conditioning operation:

[0148] N-1. When the air-conditioning heating temperature reaches the set temperature,

[0149] N-2. Open valve T3, start the No. 3 condensate pump and the No. 3 heat exchange fan to operate with frequency conversion for energy saving.

[0150] N-3. The No. 3 heating water pump operates with frequency conversion for energy saving.

[0151] In this embodiment, according to the structure of the six-pipe heat pump, controllable heat exchange tower pipelines, cooling compression pipelines, full heat recovery pipelines, heating pipelines, and condensation heating pipelines are respectively configured, enabling reasonable switching and cutoff selections according to different working conditions, and capable of achieving better heating, cooling, self-balancing and other working conditions. By adjusting the states among the pipelines, it is completely possible to achieve: the cooling working state under the automatic balance of cooling and heating in the double heat exchange tower for heating and air-conditioning operation and the cooling working state under the automatic balance of cooling and heating in the single heat exchange tower for heating and air-conditioning operation. Through this form, the most reasonable and energy-efficient control operation can be realized in different environments, and the maximum effect of the six-pipe wide-temperature heat pump can be exerted to the greatest extent.

[0152] The above-described embodiments are only a preferred solution of the present invention and do not impose any formal restrictions on the present invention. There are other variations and modifications without exceeding the technical solutions described in the claims.

Claims

1. A combined energy utilization system for a six-pipe heat pump, characterized in that, It includes n heat exchange towers, n six-pipe heat pumps, an air-conditioning heating system, an air-conditioning cooling system and several water tanks. All the heat exchange towers are interconnected. Each water tank corresponds to a six-pipe heat pump. Each six-pipe heat pump includes a wide-temperature heat pump compressor and an evaporation refrigeration circuit pipe, a condensation total heat recovery circuit pipe and a condensation heating circuit pipe that are interconnected. The interconnected evaporation refrigeration circuit pipe, condensation total heat recovery circuit pipe and condensation heating circuit pipe are driven by the wide-temperature heat pump compressor. In each six-pipe heat pump, the evaporation refrigeration circuit pipe is connected to the heat exchange tower through a heat exchange tower pipe with an evaporation water pump, and the evaporation refrigeration circuit pipe is also connected to the air-conditioning cooling system through a cooling compression pipe with a chilled water pump. An evaporation refrigeration heat exchange plate is arranged between the heat exchange tower pipe and the cooling compression pipe. In the six-pipe heat pump corresponding to the water tank, the condensation total heat recovery circuit pipe is connected to the water tank through a total heat recovery pipe with a total heat recovery water pump. In the six-pipe heat pump not corresponding to the water tank, the condensation total heat recovery circuit pipe is connected to the air-conditioning heating system through a heating pipe with a heating water pump. A total heat recovery heat exchange plate is arranged between the total heat recovery pipe and the heating pipe. In each six-pipe heat pump, the condensation heating circuit pipe is connected to the heat exchange tower through a condensation heating pipe with a condensation water pump. Controllable valves are arranged on the heat exchange tower pipe, the cooling compression pipe, the total heat recovery pipe, the heating pipe and the condensation heating pipe.

2. The combined energy utilization system of the six-pipe heat pump according to claim 1, characterized in that The output end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump is connected to the first end of the valve Zn, the second end of the valve Zn is connected to the input end of the nth heat exchange tower, the output end of the nth heat exchange tower is connected to the first end of the valve Zn', the second end of the valve Zn' is connected to the input end of the nth evaporation water pump, and the output end of the nth evaporation water pump is connected to the input end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump; the output end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump is connected to the first end of the valve K1n, the second end of the valve K1n is connected to the input end of the air-conditioning cooling system, the output end of the air-conditioning cooling system is connected to the input end of the chilled water pump, the output end of the chilled water pump is connected to the first end of the valve K1n', and the second end of the valve K1n' is connected to the input end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump; the output end of the chilled water pump is connected to the first input end of the nth evaporation refrigeration heat exchange plate through the valve K2n', the first output end of the nth evaporation refrigeration heat exchange plate is connected to the input end of the air-conditioning cooling system, the second input end of the nth evaporation refrigeration heat exchange plate is connected to the input end of the nth evaporation water pump, and the second output end of the nth evaporation refrigeration heat exchange plate is connected to the output end of the evaporation refrigeration circuit pipe in the nth six-pipe heat pump through the valve K2n. The valve K1n' and the valve K1n are interlocking valves, and the valve K2n' and the valve K2n are interlocking valves.

3. The combined energy utilization system of the six-pipe heat pump according to claim 1, characterized in that In the n - th six - pipe heat pump corresponding to a water tank, the output end of the condensation total heat recovery loop pipe is connected to the first end of the valve Rn. The second end of the valve Rn is connected to the outlet of the corresponding water tank. The outlet of the corresponding water tank is connected to the input end of the corresponding n - th total heat recovery water pump. The output end of the n - th total heat recovery water pump is connected to the input end of the condensation total heat recovery loop pipe in the n - th six - pipe heat pump corresponding to the water tank. The output end of the condensation total heat recovery loop pipe in the n - th six - pipe heat pump corresponding to the water tank is connected to the second input end of the n - th total heat recovery heat exchange plate. The second output end of the n - th total heat recovery heat exchange plate is connected to the input end of the n - th total heat recovery water pump. The first input end of the n - th total heat recovery heat exchange plate is connected to the output end of the n - th heating water pump. The input end of the n - th heating water pump is connected to the output end of the air - conditioning heating system. The first output end of the n - th total heat recovery heat exchange plate is connected to the input end of the air - conditioning heating system. The valve Nn is connected to the corresponding water tank and also to the output end of the condensation total heat recovery loop pipe.

4. The combined energy - using system of the six - pipe heat pump according to claim 1, characterized in that For the n - th six - pipe heat pump without a corresponding water tank, the output end of the condensation total heat recovery loop pipe is connected to the input end of the air - conditioning heating system. The output end of the air - conditioning heating system is connected to the input end of the n - th heating water pump. The output end of the n - th heating water pump is connected to the input end of the condensation total heat recovery loop pipe in the n - th six - pipe heat pump without a corresponding water tank.

5. The combined energy - using system of the six - pipe heat pump according to claim 1, characterized in that The output end of the condensation heating loop pipe in the n - th six - pipe heat pump is connected to the input end of the n - th heat exchange tower through the valve Tn. The output end of the n - th heat exchange tower is connected to the input end of the n - th condensation water pump. The output end of the n - th condensation water pump is connected to the input end of the condensation heating loop pipe in the n - th six - pipe heat pump.

6. The combined energy utilization system of the six-pipe heat pump according to claim 1 or 2 or 3 or 4 or 5, characterized in that, Flow meters and / or temperature sensors are configured on the heat exchange tower pipeline, the cooling compression pipeline, the total heat recovery pipeline, the heating pipeline, and the condensation heating pipeline.

7. The combined energy - using system of the six - pipe heat pump according to claim 6, characterized in that A valve Bn is provided at the inlet of the n - th water tank. The second end of the valve Rn is connected to the inlet of the corresponding water tank through the valve Bn. A valve Cn is provided at the outlet of the n - th water tank. The outlet of the n - th water tank is connected to the input end of the corresponding n - th total heat recovery water pump through the valve Cn. The water supply end of the water tank supplies water to the hot water supply system through the valve An.

8. A control method for a combined energy utilization system of a six-pipe heat pump, applicable to the combined energy utilization system of the six-pipe heat pump as described in claim 1, characterized in that, According to the control instruction, the combined energy - using system of the six - pipe heat pump enters the corresponding working state and executes the corresponding working steps. The working states include The full - load air - conditioning heating working state, the air - conditioning heating load unloading working state, the air - conditioning heating and domestic hot water heating working state, the domestic hot water heating and air - conditioning heating / heat pump non - shutdown switching working state, and the heating working state during the cooling air - conditioning automatic balance of cold and heat operation state by using the condensation heating loop pipe and adjusting the corresponding valves. It is achieved by using a condensation total heat recovery circuit pipe and adjusting the corresponding valves: full-load domestic hot water heating working state, full-load domestic hot water heating unloading working state, domestic hot water operation heating working state, and full-cooling recovery for air conditioning cooling working state in the case of domestic hot water heating; It is achieved by using an evaporation refrigeration circuit pipe and adjusting the corresponding valves: full-load air conditioning cooling working state, full-load air conditioning cooling unloading working state, total heat recovery hot water heating working state in the case of air conditioning cooling, cooling working state in the single heat exchange tower heating and air conditioning automatic balance of cooling and heating operation state, and cooling working state in the double heat exchange tower heating and air conditioning automatic balance of cooling and heating operation state.

9. The control method of the combined energy utilization system of the six-pipe heat pump according to claim 8, characterized in that, The starting steps of the heating working state in the air conditioning cooling automatic balance of cooling and heating operation state are as follows: Step E1, when the detected water temperature has reached the set low temperature value, select a six-pipe heat pump in which an evaporation refrigeration circuit pipe is connected to the heat exchange tower to form a circuit and the condensation heat supply circuit pipe is connected to the air conditioning heat supply system; Step E2, cut off the connection state between the condensation heat supply circuit pipe and the air conditioning heat supply system, and connect the input end of the evaporation refrigeration circuit pipe in the selected six-pipe heat pump to the output end of the evaporation refrigeration circuit pipe through an evaporation refrigeration heat exchange plate to form a circuit; Step E3, the air conditioning cooling system cools down through the evaporation refrigeration heat exchange plate; The starting steps of the full-cooling recovery for air conditioning cooling working state in the case of domestic hot water heating are as follows: Step I1, in the nth six-pipe heat pump corresponding to the water tank, the condensation total heat recovery circuit pipe is connected to the corresponding water tank, and a circuit is formed between the output end and the input end of the evaporation refrigeration circuit pipe through an evaporation refrigeration heat exchange plate; Step I2, the air conditioning cooling system cools down through the evaporation refrigeration heat exchange plate.

10. The control method for the combined energy utilization system of the six-pipe heat pump according to claim 8, characterized in that The starting steps of the cooling working state in the single heat exchange tower heating and air conditioning automatic balance of cooling and heating operation state are as follows: Step M1: When it is detected that the air conditioning heating temperature is lower than the set temperature, the evaporation refrigeration circuit pipes in all six-pipe heat pumps are connected to the air conditioning cooling system, and the condensation heat supply circuit pipe in one six-pipe heat pump is connected to the heat exchange tower; Step M2: Select the condensation total heat recovery circuit pipe in another six-pipe heat pump and connect it to the air conditioning heat supply system through the corresponding frequency conversion energy-saving operation heating water pump; The starting steps of the cooling working state in the double heat exchange tower heating and air conditioning automatic balance of cooling and heating operation state are as follows: Step N1: When it is detected that the air conditioning heating temperature is lower than the set temperature, the evaporation refrigeration circuit pipes in all six-pipe heat pumps are connected to the air conditioning cooling system, and the condensation heat supply circuit pipes in the six-pipe heat pumps are connected to the heat exchange tower; Step N2: Select the condensation total heat recovery circuit pipe in one six-pipe heat pump and connect it to the air conditioning heat supply system through the corresponding frequency conversion energy-saving operation heating water pump.

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