Air source heat pump coupling electric boiler and heat storage device combined heating system

Abstract

A combined heating system with an air source heat pump coupled with an electric boiler and a heat storage device comprises a tap water pipeline, the electric boiler, a heat exchanger, the air source heat pump, a heat supply network water return pipeline, a heat supply network water supply pipeline, a heat storage water tank, a high-temperature water pipeline of the heat storage water tank and a low-temperature water pipeline of the heat storage water tank. The heat exchanger is communicated with the air source heat pump in parallel, the heat supply network water return pipeline is communicated with the heat exchanger and the air source heat pump, a heat storage circulating pump is arranged on the heat supply network water return pipeline, the heat supply network water supply pipeline is communicated with the heat exchanger and the air source heat pump, and a heating circulating pump is arranged on the heat supply network water supply pipeline. The heat storage water tank high-temperature water pipeline and the heat storage water tank low-temperature water pipeline are communicated with a heat supply network water supply pipeline and a heat supply network water return pipeline respectively, and the tap water pipeline is communicated with the electric boiler, the heat storage water tank high-temperature water pipeline and the heat storage water tank low-temperature water pipeline. When the efficiency of the air source heat pump is reduced or the heating requirement cannot be met, the electric boiler starts to work, and the heating stability is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of heating system, and specifically points to a kind of air source heat pump coupling electric boiler and heat storage device combined heating system. BACKGROUND

[0002] Air source heat pump as a kind of clean, efficient cold and heat source equipment, under the impetus of national environmental policy, has been vigorously promoted, with the continuous progress and development of heat pump technology, its application region gradually expands too.Heating performance of air source heat pump unit can be influenced by outside air parameter, the lower outdoor temperature in winter, the lower air source heat pump evaporator inlet air temperature is;The higher the altitude of the region, the smaller the air density, the lower the air mass flow through evaporator.I.e., the lower outdoor temperature in winter, the higher altitude, the lower heating capacity of air source heat pump, the higher power consumed by unit.In addition, with the continuous decline of outdoor air temperature, air source heat pump unit outdoor heat exchanger wall will appear frost phenomenon, leading to evaporator heat transfer performance reduction, fan performance attenuation, unit heating capacity reduction, COP reduction.Therefore, when applied in severe cold or high altitude area, under the influence of lower outdoor temperature and thin air, air source heat pump performance can reduce. SUMMARY

[0003] The utility model provides a kind of air source heat pump coupling electric boiler and heat storage device combined heating system, its main purpose is to overcome the existing air source heat pump when used in severe cold or high altitude area performance reduction, leading to unstable heating problem.

[0004] To solve the above technical problem, the utility model adopts the following technical scheme:

[0005] A kind of air source heat pump coupling electric boiler and heat storage device combined heating system, including tap water pipeline, electric boiler, heat exchanger, air source heat pump, heat network backwater pipeline, heat network water supply pipeline, heat storage water tank, heat storage water tank high temperature water pipeline and heat storage water tank low temperature water pipeline, the electric boiler is communicated with heat exchanger, the heat exchanger is communicated with air source heat pump in parallel, the heat network backwater pipeline is communicated with heat exchanger and air source heat pump, the heat network backwater pipeline is equipped with heat storage circulating pump before air source heat pump inlet, the heat network water supply pipeline is communicated with heat exchanger and air source heat pump, the heat network water supply pipeline is equipped with heating circulating pump, the heat storage water tank is communicated with heat network water supply pipeline and heat network backwater pipeline by heat storage water tank high temperature water pipeline and heat storage water tank low temperature water pipeline, the tap water pipeline is communicated with electric boiler, heat storage water tank high temperature water pipeline and heat storage water tank low temperature water pipeline.

[0006] Further, the upper portion and lower portion of the heat storage water tank have an upper inlet and outlet and a lower inlet and outlet, respectively, and the heat storage water tank high temperature water pipeline and the heat storage water tank low temperature water pipeline are communicated with the upper inlet and outlet and the lower inlet and outlet.

[0007] Further, the utility model still includes soft waterer, soft waterer with water pipe, electric boiler, heat storage water jar high temperature water pipeline and heat storage water jar low temperature water pipeline intercommunication.

[0008] Further, the utility model still includes pure water treatment facilities and softening water tank, pure water treatment facilities with soft waterer intercommunication, pure water treatment facilities with softening water tank intercommunication, softening water tank with electric boiler intercommunication.

[0009] Further, the utility model still includes expansion water tank and water replenishing pump, expansion water tank with soft waterer intercommunication, water replenishing pump with expansion water tank, heat storage water jar high temperature water pipeline and heat storage water jar low temperature water pipeline intercommunication.

[0010] Further, heating equipment high temperature water pipeline is equipped between the heat exchanger and the heating circulating pump, and the air source heat pump and the heat storage water jar high temperature water pipeline are communicated with the heating equipment high temperature water pipeline.

[0011] Further, the heat exchanger is a plate heat exchanger.

[0012] From the above description of the utility model, compared with the prior art, the utility model has the following advantages:

[0013] 1) heating stability: the air source heat pump can be used with conventional electric boiler. When the outdoor temperature is too low, the efficiency of the air source heat pump decreases or cannot meet the heating demand, the electric boiler starts to work, ensuring the stability of heating.

[0014] 2) not limited by energy supply: electricity is a widely available energy source, and the supply is relatively stable. As long as there is power supply, the air source heat pump and the electric boiler can operate normally, and are not affected by factors such as insufficient light resources, tight gas supply, insufficient water resources, and uneven distribution of geothermal energy resources.

[0015] 3) convenient installation and use: the installation of the electric boiler is relatively simple, without the need to install heat collecting plates like solar heating, without the need to lay gas pipelines like gas boilers, and without the need to consider water source acquisition and water quality like water source heat pumps, and without the need for complex underground engineering construction like geothermal energy. It only needs to be connected to the power supply and the heating pipeline to be put into use.

[0016] 4) high reliability: the system has high reliability and generally has few faults. It is not affected by changes in parameters such as solar energy, gas, geothermal energy, and water source. The addition of the electric boiler can compensate for the performance degradation of the air source heat pump in extreme weather, maintaining stable heating of the system. Moreover, with the continuous development of electric power technology, the stability of power supply is also continuously improving, further ensuring the normal operation of the electric boiler.

[0017] 5) Low operating cost: the air source heat pump itself has a high COP, and the energy efficiency is greater than 1, so that one part of the electric energy can output more than one part of the heat. The electric boiler technology is also very mature, and the efficiency can reach more than 95%. The combination of the two, the total COP of the system is still greater than 1. By setting the heat storage water tank, the low valley electricity price can also be fully utilized. During the valley electricity period, the air source heat pump and the electric boiler are started at full load, a part is used for heating, and the surplus heat is stored in the heat storage water tank. During the peak electricity period, the electricity price is very high, and the air source heat pump and the electric boiler are not started, but the heat stored in the heat storage water tank is used to heat the building, further reducing the operating cost.

[0018] 6) Good heat storage effect: compared with the air source heat pump + heat storage device, the electric boiler can be added to the heat pump to heat the water to above 90℃, so that the heat storage water tank has better heat storage effect, and the heat storage temperature difference is enlarged, and the volume of the heat storage water tank is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The system principle diagram of the utility model. DETAILED DESCRIPTION

[0020] Referring to Figure 1 An air source heat pump coupled with an electric boiler and a heat storage device combined heating system, comprising a tap water pipeline 1, an electric boiler 2, a heat exchanger 3, an air source heat pump 4, a heat network return water pipeline 5, a heat network water supply pipeline 6, a heat storage water tank 7, a heat storage water tank high-temperature water pipeline 8 and a heat storage water tank low-temperature water pipeline 9, the heat exchanger 3 is a plate heat exchanger. The electric boiler 2 is communicated with the heat exchanger 3, the heat exchanger 3 is communicated with the air source heat pump 4 in parallel, the heat network return water pipeline 5 is communicated with the heat exchanger 3 and the air source heat pump 4, the heat network return water pipeline 5 is provided with a heat storage circulating pump 10 located in front of the air source heat pump 4 inlet, the heat network water supply pipeline 6 is communicated with the heat exchanger 3 and the air source heat pump 4, the heat network water supply pipeline 6 is provided with a heating circulating pump 11, the heat storage water tank 7 is communicated with the heat network water supply pipeline 6 and the heat network return water pipeline 5 through the heat storage water tank high-temperature water pipeline 8 and the heat storage water tank low-temperature water pipeline 9, and the tap water pipeline 1 is communicated with the electric boiler 2, the heat storage water tank high-temperature water pipeline 8 and the heat storage water tank low-temperature water pipeline 9.

[0021] Referring to Figure 1 The upper part and the lower part of the heat storage water tank 7 are respectively provided with an upper inlet and outlet water port 12 and a lower inlet and outlet water port 13, and the heat storage water tank high-temperature water pipeline 8 and the heat storage water tank low-temperature water pipeline 9 are communicated with the upper inlet and outlet water port 12 and the lower inlet and outlet water port 13.

[0022] Referring to Figure 1The utility model also includes softener 14, softener 14 communicates with water pipe 1, electric boiler 2, heat storage water tank high temperature water pipe 8 and heat storage water tank low temperature water pipe 9, softener 14 can remove calcium, magnesium ion in water, reduce water quality hardness. The utility model also includes pure water treatment equipment 15 and soften water tank 16, pure water treatment equipment 15 communicates with softener 14, pure water treatment equipment 15 communicates with soften water tank 16, soften water tank 16 communicates with electric boiler 2;Pure water treatment equipment 15 can further remove impurity in water, make it reach very high purity, soften water tank 16 is used to store after softening treatment soft water, these soft water are mainly used to reduce the formation of scale in pipeline and heat exchange equipment.

[0023] Refer to Figure 1 The utility model also includes expansion tank 17 and water replenishing pump 18, expansion tank 17 communicates with softener 14, water replenishing pump 18 communicates with expansion tank 17, heat storage water tank high temperature water pipe 8 and heat storage water tank low temperature water pipe 9, expansion tank 17 is used to accommodate and compensate the expansion and contraction of water in system.

[0024] Refer to Figure 1 In the embodiment, heating equipment high temperature water pipe 19 is equipped between heat exchanger 3 and heating circulating pump 11, air source heat pump 4 and heat storage water tank high temperature water pipe 8 communicate with heating equipment high temperature water pipe 19.

[0025] Refer to Figure 1 The design principle of the utility model is as follows: after the softening treatment of water by softener 14, a part is delivered to expansion tank 17, under the operation of water replenishing pump 18, is used to replenish water for heat storage loop and pipe network;Another part is delivered to pure water treatment equipment 15, after the RO membrane treatment of pure water treatment equipment 15, is delivered to soften water tank 16, and then enters electric boiler 2 and heats up.

[0026] When in the valley electricity period, the system starts the heat storage mode, the electric boiler 2 and the air source heat pump 4 run at full load. The water in the heat network return water pipeline 5 is heated in the air source heat pump 4 under the operation of the heat storage circulating pump 10, and the highest temperature can be about 60 DEG C; another part enters the heat exchanger 3, and the heat of the boiler water of the electric boiler 2 is absorbed by the non-contact heat exchange mode, and the temperature can be above 90 DEG C. Two different temperature hot water in the heating equipment high temperature water pipeline 19, a part under the operation of the heating circulating pump 11, is delivered to the heat network water supply pipeline 6, and meets the heating heat demand; another part enters the top of the heat storage water tank 7 from the upper inlet and outlet 12 through the heat storage water tank high temperature water pipeline 8, and is stored in the tank. The lower temperature water at the bottom of the heat storage water tank 7 flows into the heat storage water tank low temperature water pipeline 9 through the lower inlet and outlet 13, and then is heated in the air source heat pump 4 and the electric boiler 2 under the operation of the heat storage circulating pump 10.

[0027] When in the valley electricity period, the system starts the heat storage mode, the electric boiler 2 and the air source heat pump 4 run at full load. The water in the heat network return water pipeline 5 is heated in the air source heat pump 4 under the operation of the heat storage circulating pump 10, and the highest temperature can be about 60 DEG C; another part enters the heat exchanger 3, and the heat of the boiler water of the electric boiler 2 is absorbed by the non-contact heat exchange mode, and the temperature can be above 90 DEG C. Two different temperature hot water in the heating equipment high temperature water pipeline 19, a part under the operation of the heating circulating pump 11, is delivered to the heat network water supply pipeline 6, and meets the heating heat demand; another part enters the top of the heat storage water tank 7 from the upper inlet and outlet 12 through the heat storage water tank high temperature water pipeline 8, and is stored in the tank. The lower temperature water at the bottom of the heat storage water tank 7 flows into the heat storage water tank low temperature water pipeline 9 through the lower inlet and outlet 13, and then is heated in the air source heat pump 4 and the electric boiler 2 under the operation of the heat storage circulating pump 10.

[0028] The above is only a specific embodiment of the present application, but the design concept of the present application is not limited to this, and any non-essential change of the present application by using the concept should belong to the act of infringing the protection scope of the present application.

Claims

1. An air source heat pump coupled with an electric boiler and a heat storage device combined heating system, characterized in that: The system comprises a tap water pipeline, an electric boiler, a heat exchanger, an air source heat pump, a heat network return water pipeline, a heat network water supply pipeline, a heat storage tank, a heat storage tank high temperature water pipeline and a heat storage tank low temperature water pipeline.

2. The air source heat pump coupled with electric boiler and heat storage device combined heating system according to claim 1, characterized in that: The heat storage tank has an upper inlet and outlet and a lower inlet and outlet.

3. The air source heat pump coupled with electric boiler and heat storage device combined heating system according to claim 1, characterized in that: The system further comprises a water softener connected to the tap water pipeline, the electric boiler, the heat storage tank high temperature water pipeline and the heat storage tank low temperature water pipeline.

4. The air source heat pump coupled with electric boiler and heat storage device combined heating system according to claim 3, characterized in that: The system further comprises a pure water treatment device connected to the water softener, a softened water tank connected to the pure water treatment device and the electric boiler.

5. The air source heat pump coupled with electric boiler and heat storage device combined heating system according to claim 3, characterized in that: The system further comprises an expansion tank connected to the water softener and a water supply pump connected to the expansion tank, the heat storage tank high temperature water pipeline and the heat storage tank low temperature water pipeline.

6. The air source heat pump coupled with electric boiler and heat storage device combined heating system according to claim 1, characterized in that: The heat exchanger and the heating equipment high temperature water pipeline are connected to the air source heat pump and the heat storage tank high temperature water pipeline.

7. The air source heat pump coupled with electric boiler and heat storage device combined heating system according to claim 1, characterized in that: The heat exchanger is a plate heat exchanger.

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