Electric heat pump coupling application

Abstract

The invention discloses electric heat pump coupling application and relates to the field of heating. The device comprises a resident secondary side low-area pipe, a plate heat exchanger is arranged beside the resident secondary side low-area pipe, an electric heat pump is further arranged beside the resident secondary side low-area pipe, the plate heat exchanger is used for providing main heat supply for the resident secondary side low-area pipe, the electric heat pump is used for providing auxiliary heat supply for the resident secondary side low-area pipe, and the electric heat pump internally comprises a condenser and an evaporator. The condenser is used for supplying heat to a resident secondary side low-area pipe, and the evaporator is used for absorbing external heat. According to the device, primary network return water is adopted as a low-temperature heat source, an efficient electric compression heat pump device is adopted, primary hot water energy is further extracted, meanwhile, heat is supplied to secondary side low-area pipes of residents together with a plate type heat exchanger, on the basis of primary network potential tapping, energy-saving and consumption-reducing demand balance control is achieved, the primary network heat source is utilized to the maximum extent, and energy conservation and emission reduction are achieved. The heat supply capacity of a pipe network is expanded, supply-demand balance is achieved, and the partial problem of insufficient heat sources is solved.

Description

Technical Field

[0001] The invention relates to the technical field of heating, in particular to an electric heat pump coupling application. Background Art

[0002] Electric heat pump coupling application refers to a technology that couples electric heat pumps with other heat sources or systems to improve energy efficiency and heating effects. Electric heat pump coupling application is based on the principle of thermodynamics, using electric energy to drive the heat pump system, absorbing heat from low-temperature heat sources such as air, water, and geothermal heat, and converting it into high-temperature heat energy for heating or other purposes. In coupling applications, electric heat pumps are usually combined with other heat sources such as solar energy, waste heat, or systems such as cogeneration systems, energy storage systems, etc. to achieve efficient energy utilization and complementarity.

[0003] In winter, while the heating demand in northern cities is increasing, in some northern regions, the primary network flow allocated by the urban ring network transmission and distribution company to the secondary heating company has reached its peak. According to the conventional heating method in the past, it is difficult to meet the needs of regional load development. For example, when the flow allocated by the pipeline network transmission and distribution company to the second heating company has reached its peak, the problem of insufficient heat source will become increasingly serious, eventually leading to insufficient heating for residents and difficulty in meeting regional load development. In view of the above situation, the present invention provides an electric heat pump coupling application to solve the above problem. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an electric heat pump coupling application, which solves the problem that when the flow allocated by the pipeline distribution company to the second thermal power company has reached its peak, the problem of insufficient heat source will become increasingly serious, ultimately leading to insufficient heating for residents and difficulty in meeting regional load development.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an electric heat pump coupling application, including a residential secondary low zone pipe, a plate heat exchanger is arranged next to the residential secondary low zone pipe, and an electric heat pump is also arranged next to the residential secondary low zone pipe, wherein the plate heat exchanger is used to provide main heating for the residential secondary low zone pipe, wherein the electric heat pump is used to provide auxiliary heating for the residential secondary low zone pipe, and the electric heat pump includes a condenser and an evaporator, the condenser is used to heat the residential secondary low zone pipe, and the evaporator is used to absorb external heat.

[0006] Preferably, an expansion valve and a compressor are further provided in the electric heat pump, wherein the expansion valve is provided between the condenser and the evaporator, and the compressor is provided between the evaporator and the condenser, and a pipe loop is connected between the expansion valve, the compressor, the condenser and the evaporator.

[0007] Preferably, a refrigerant flows in the pipe loop, the refrigerant outputs heat in the condenser, the refrigerant inputs heat in the evaporator, and the refrigerant undergoes a phase change in the pipe loop.

[0008] Preferably, a primary network return water side pipe is provided on one side of the electric heat pump evaporator, a connecting pipe is provided on the input end of the primary network return water side pipe, and a mixing water pump is provided on the connecting pipe.

[0009] Preferably, the heat in the return water side pipe of the primary network is transferred to the refrigerant through the evaporator to complete the heat input.

[0010] Preferably, a solenoid valve is further provided outside the electric heat pump, and the solenoid valve is used to control the heat output of the electric heat pump.

[0011] The present invention discloses an electric heat pump coupling application, which has the following beneficial effects: the electric heat pump coupling application adopts primary network return water as a low-temperature heat source, adopts a high-efficiency electric compression heat pump device to reduce the primary network return water temperature to below 20°C, further extracts primary hot water energy, and simultaneously works with a plate heat exchanger to heat the secondary side low-zone pipes of residents. On the basis of tapping the potential of the primary network, demand balance control for energy saving and consumption reduction is achieved, the primary network heat source is utilized to the greatest extent, the heating capacity of the pipe network is expanded, the supply and demand balance is achieved, and some problems of insufficient heat sources are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is a schematic diagram of the internal structure of the electric heat pump of the present invention;

[0014] Figure 2 It is a schematic diagram of the overall process structure of the present invention;

[0015] Figure 3 It is a schematic diagram of the evaporator side loop structure of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The embodiment of the present application provides an electric heat pump coupling application to solve the problem that when the flow allocated by the pipeline distribution company to the second thermal power company has reached its peak, the problem of insufficient heat source will become increasingly serious, ultimately leading to insufficient heating for residents and difficulty in meeting regional load development.

[0018] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] The embodiment of the present invention discloses an electric heat pump coupling application.

[0020] According to the attached Figure 1-2 As shown,

[0021] It includes a secondary low-zone pipe for residents, a plate heat exchanger is arranged next to the secondary low-zone pipe for residents, and an electric heat pump is also arranged next to the secondary low-zone pipe for residents, wherein the plate heat exchanger is used to provide main heating for the secondary low-zone pipe for residents, wherein the electric heat pump is used to provide auxiliary heating for the secondary low-zone pipe for residents, the electric heat pump includes a condenser and an evaporator, the condenser is used to provide heating for the secondary low-zone pipe for residents, and the evaporator is used to absorb external heat, for the pipe network side, return water is extracted from the return pipe of the primary network, as chilled water for the heat pump, enters the electric compression heat pump, and is sent back to the return pipe of the primary network after the temperature is reduced (≤20℃), and is mixed with water and then transported back to the heat source, the secondary side circulating water of the heat user enters the condenser side of the heat pump as cooling water for the heat pump unit, and is output to the secondary side water supply pipe after the condenser is heated, and finally output to the heat user to meet the heating needs of the heat user.

[0022] The electric heat pump is also provided with an expansion valve and a compressor. The expansion valve is arranged between the condenser and the evaporator, and the compressor is arranged between the evaporator and the condenser. A pipe loop is connected between the expansion valve, the compressor, the condenser and the evaporator. Refrigerant flows in the pipe loop. The refrigerant outputs heat in the condenser and inputs heat in the evaporator. The refrigerant has a phase change in the pipe loop. A primary network return water side pipe is arranged on one side of the electric heat pump evaporator. A connecting pipe is arranged on the input end of the primary network return water side pipe. A mixing water pump is arranged on the connecting pipe. The heat in the primary network return water side pipe is transferred to the refrigerant through the evaporator to complete the heat input. In the internal circulation of the electric compression heat pump, the refrigerant After passing through the electrically driven compressor, it becomes high-temperature and high-pressure working fluid steam. The working fluid steam releases heat to the cooling water in the condenser and becomes a high-temperature and high-pressure liquid. After passing through the throttling device, it enters the gas-liquid coexistence phase. The gas-liquid coexistence phase enters the evaporator and absorbs heat from the chilled water to become low-temperature and low-pressure steam. The low-temperature and low-pressure steam finally enters the compressor to complete the entire cycle. For the electric compression heat pump, the primary network return water is extracted as the chilled water of the unit, and the primary network return water is used as the low-temperature heat source to extract heat from it, thereby reducing the primary network return water temperature. The secondary network return water transported to the heat users is used as the cooling water of the unit, and the temperature is increased in the condenser to form a secondary network as a high-temperature heat source, which outputs heat to its heat users to meet the heating needs of the heat users.

[0023] A solenoid valve is also provided outside the electric heat pump. The solenoid valve is used to control the heat output of the electric heat pump. At this time, if the plate exchanger and the heat pump are used for joint heating, after the secondary side low-zone return water main pipe is extracted from the branch line, the main return water still uses the original pipeline to enter the low-zone plate exchanger, and is heated by the municipal primary hot water and then supplied along the secondary water supply main pipe. When the plate exchanger system is used for separate heating, the solenoid valves entering the heat pump evaporator and condenser are closed, and the bypass valves are opened, so that the original plate exchanger heating system is used for separate heating. When the heat pump system is used for separate heating, it is necessary to adjust and close the bypass valves, open the evaporator side and condenser side valves, and close the electric regulating valve installed on the secondary water supply outlet side of the plate exchanger. At this time, the secondary side circulation flow completely enters the heat pump condenser, thereby realizing separate heating by the heat pump. However, due to the low actual operating flow on the primary side of this project, the heat pump cannot meet the heat load requirements of low-zone heat users when it is used for separate heating. Therefore, the heat pump is not used for separate heating in this project.

[0024] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0025] The electric heat pump coupling application uses the primary network return water as the low-temperature heat source and adopts a high-efficiency electric compression heat pump device to reduce the primary network return water temperature to below 20°C, further extract the primary hot water energy, and work with the plate heat exchanger to heat the secondary side low-zone pipes of residents. On the basis of tapping the potential of the primary network, it realizes demand balance control for energy saving and consumption reduction, maximizes the use of the primary network heat source, expands the heating capacity of the pipe network, realizes supply and demand balance, and solves some problems of insufficient heat source.

[0026] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Electric heat pump coupling application, including residential secondary side low zone pipe, the residential secondary side low zone pipe is provided with a plate heat exchanger, characterized in that: An electric heat pump is also provided next to the low-zone pipe on the secondary side of the residents; Wherein, the plate heat exchanger is used to provide main heating for the secondary low-zone pipes of residents; Among them, the electric heat pump is used to provide auxiliary heating for the secondary side low zone pipes of residents. The electric heat pump includes a condenser and an evaporator. The condenser is used to heat the secondary side low zone pipes of residents, and the evaporator is used to absorb external heat.

2. The electric heat pump coupling application according to claim 1, characterized in that: An expansion valve and a compressor are also provided in the electric heat pump. The expansion valve is provided between the condenser and the evaporator, and the compressor is provided between the evaporator and the condenser. A pipe loop is connected between the expansion valve, the compressor, the condenser and the evaporator.

3. The electric heat pump coupling application according to claim 2, characterized in that: A refrigerant flows in the pipe loop, the refrigerant outputs heat in the condenser, the refrigerant inputs heat in the evaporator, and the refrigerant undergoes a phase change in the pipe loop.

4. The electric heat pump coupling application according to claim 3, characterized in that: A primary network return water side pipe is arranged on one side of the electric heat pump evaporator, a connecting pipe is arranged on the input end of the primary network return water side pipe, and a mixing water pump is arranged on the connecting pipe.

5. The electric heat pump coupling application according to claim 4, characterized in that: The heat in the return water side pipe of the primary network is transferred to the refrigerant through the evaporator to complete the heat input.

6. The electric heat pump coupling application according to claim 1, characterized in that: The electric heat pump is also provided with a solenoid valve, which is used to control the heat output of the electric heat pump.

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