Novel air source heat pump composite heat supply system

Abstract

The utility model discloses a novel air source heat pump composite heat supply system, which relates to the technical field of heat supply and comprises an electric boiler, a heat accumulator, a first evaporator, a circulating pump, an air source heat pump, a heat exchanger, a first stop valve and a second stop valve. The first evaporator is communicated with the air source heat pump in a circulating mode, a first expansion valve is arranged on a communication pipeline of the first evaporator and the air source heat pump, the heat exchanger is communicated with the heat accumulator, the first evaporator and the air source heat pump, and the second stop valve is arranged on a communication pipeline of the heat accumulator and the heat exchanger. The air source heat pump solves the problems that the air source heat pump is poor in operation performance in a severe cold area and cannot meet the heat utilization requirement of the area, and the heat exchanger and the evaporator are frosted, the application range of the air source heat pump is widened, and economic benefits in the operation period are improved.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, specifically to a novel air source heat pump composite heating system. Background Technology

[0002] Air source heat pumps offer advantages such as safety, hygiene, energy efficiency, and high performance, making them suitable for use in public and residential buildings. However, some issues exist in cold regions: when the required heat is high, the heating capacity of the air source heat pump is insufficient; when the outside temperature is low, the evaporation temperature is low, resulting in a lower coefficient of performance (COP) and higher energy consumption for the same heat output; furthermore, the low outdoor air temperature easily causes frost to form on the evaporator, affecting heat exchange efficiency and potentially damaging it, thus reducing the lifespan of the air conditioning system. Therefore, the use of air source heat pump systems in cold northern regions is significantly limited. Utility Model Content

[0003] This utility model provides a novel air source heat pump composite heating system, the main purpose of which is to overcome the above-mentioned problems existing in the use of existing air source heat pump systems in cold regions.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A novel air-source heat pump composite heating system includes an electric boiler, a heat accumulator, a first evaporator, a circulating pump, an air-source heat pump, a heat exchanger, a first shut-off valve, and a second shut-off valve. The electric boiler, heat accumulator, first shut-off valve, first evaporator, and circulating pump are circulated together. The first evaporator is circulated together with the air-source heat pump. A first expansion valve is provided on the connecting pipeline between the first evaporator and the air-source heat pump. The heat exchanger is connected to the heat accumulator, the first evaporator, and the air-source heat pump. The second shut-off valve is located on the connecting pipeline between the heat accumulator and the heat exchanger.

[0006] Furthermore, the air source heat pump includes a second evaporator, a compressor, a condenser, a liquid receiver, a filter, and a second expansion valve. The second evaporator, compressor, condenser, liquid receiver, filter, and second expansion valve are circulated together. The second evaporator is connected in parallel with the first evaporator. The first expansion valve is located on the connecting pipe between the second evaporator and the first evaporator. The condenser is connected to a heat exchanger.

[0007] Furthermore, the heat storage device includes a water tank, a heat storage layer covering the water tank, and an insulation layer covering the heat storage layer.

[0008] Furthermore, the heat storage layer is a phase change energy storage material layer, and the insulation layer is an aluminum silicate insulation material layer.

[0009] As described above, compared with the prior art, this utility model has the following advantages: During off-peak electricity periods, an electric boiler is used to convert electrical energy into heat energy, which is then stored in a heat storage device using water as the heat storage medium. In extreme weather conditions, the air source heat pump operates at low efficiency and cannot meet the user's actual heating needs. The system will activate the heat storage device, using a circulating pump to deliver hot water to the first evaporator for heat exchange. Part of the heat absorbed by the first evaporator is absorbed by the refrigerant within it, while the remaining heat is used to heat the air for heat exchange with the air source heat pump. When the outdoor air temperature is low and the humidity is high, using the hot water in the heat storage device as an auxiliary system can effectively prevent the outdoor heat exchanger of the air source heat pump unit from frosting. When the winter heat load is high, the hot water in the heat storage device can exchange heat within the heat exchanger to raise the water temperature for user use, thereby improving system performance, reducing operating costs, and effectively solving the problems of evaporator frosting and low system performance when using air source heat pump units under high winter heat loads. Attached Figure Description

[0010] Figure 1 This is a system schematic diagram of the present invention.

[0011] Figure 2 This is a structural diagram of the heat accumulator of this utility model. Detailed Implementation

[0012] Reference Figure 1 A novel air-source heat pump composite heating system includes an electric boiler 1, a heat storage tank 2, a first evaporator 3, a circulating pump 4, an air-source heat pump 5, a heat exchanger 6, a first shut-off valve 7, and a second shut-off valve 8. The electric boiler 1, heat storage tank 2, first shut-off valve 7, first evaporator 3, and circulating pump 4 are circulated and connected through pipelines. The first evaporator 3 and air-source heat pump 5 are circulated and connected through pipelines. A first expansion valve 9 is provided on the connecting pipeline between the first evaporator 3 and air-source heat pump 5. The heat exchanger 6 is connected to the heat storage tank 2, the first evaporator 3, and the air-source heat pump 5. The second shut-off valve 8 is located on the connecting pipeline between the heat storage tank 2 and the heat exchanger 6.

[0013] Reference Figure 1 The air source heat pump 5 includes a second evaporator 51, a compressor 52, a condenser 53, a liquid receiver 54, a filter 55, and a second expansion valve 56. The second evaporator 51, compressor 52, condenser 53, liquid receiver 54, filter 55, and second expansion valve 56 are circulated together through a pipeline. The second evaporator 51 is connected in parallel with the first evaporator 3 through a pipeline. The first expansion valve 9 is located on the connecting pipeline between the second evaporator 51 and the first evaporator 3. The condenser 53 is connected to the heat exchanger 6. Specifically, the user's secondary side is connected to the condenser 53 and the heat exchanger 6 through a pipeline.

[0014] Reference Figure 1 and Figure 2 The heat storage device 2 includes a water tank 21, a heat storage layer 22 covering the water tank 21, and an insulation layer 23 covering the heat storage layer 22. The heat storage layer 22 is a phase change energy storage material layer. A portion of the heat energy in the water tank 21 exchanges heat with the refrigerant in the first evaporator 3 along with the liquid flow, and a portion of the heat energy exchanges heat with the phase change energy storage material layer, storing the heat within the phase change energy storage material layer. The insulation layer 23 is an aluminum silicate insulation material layer. Covering the phase change energy storage material layer with an aluminum silicate insulation material layer can reduce heat loss.

[0015] Reference Figure 1 The design principle of this utility model is as follows: The electric boiler 1 heats water during off-peak electricity hours and stores it in the heat storage tank 2. When the outdoor temperature is low, the heat storage tank 2 is opened, the second shut-off valve 8 remains closed, and the first shut-off valve 7 is opened. The hot water is transported to the first evaporator 3 by the circulating pump 4 for heat exchange. Part of the heat from the hot water is absorbed by the refrigerant in the first evaporator 3, and the other part of the heat heats the air, which is absorbed by the refrigerant in the second evaporator 51 of the air source heat pump 5. The vaporized refrigerant passes through the compressor 52 and enters the condenser to exchange heat with the user's secondary heating network. When the heat load is high in winter and the secondary heating network supply water temperature cannot meet the user's heating needs, the second shut-off valve 8 is opened and the first shut-off valve 7 is closed. The secondary return water is then heated again by the heat exchanger 6 after heat exchange in the condenser 53 and sent to the user's water supply network.

[0016] This invention solves the problems of poor performance of air source heat pumps in extremely cold regions, inability to meet regional heating demands, and frost formation on heat exchangers and evaporators, thereby improving the applicability and economic benefits of air source heat pumps during operation.

[0017] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A novel air-source heat pump combined heating system, characterized in that: The device includes an electric boiler, a heat accumulator, a first evaporator, a circulating pump, an air source heat pump, a heat exchanger, a first shut-off valve, and a second shut-off valve. The electric boiler, heat accumulator, first shut-off valve, first evaporator, and circulating pump are circulated together. The first evaporator is circulated together with the air source heat pump. A first expansion valve is provided on the connecting pipeline between the first evaporator and the air source heat pump. The heat exchanger is connected to the heat accumulator, the first evaporator, and the air source heat pump. The second shut-off valve is located on the connecting pipeline between the heat accumulator and the heat exchanger.

2. The novel air-source heat pump composite heating system as described in claim 1, characterized in that: The air source heat pump includes a second evaporator, a compressor, a condenser, a liquid receiver, a filter, and a second expansion valve. The second evaporator, compressor, condenser, liquid receiver, filter, and second expansion valve are circulated together. The second evaporator is connected in parallel with the first evaporator. The first expansion valve is located on the connecting pipe between the second evaporator and the first evaporator. The condenser is connected to a heat exchanger.

3. The novel air-source heat pump composite heating system as described in claim 1, characterized in that: The heat storage device includes a water tank, a heat storage layer covering the water tank, and an insulation layer covering the heat storage layer.

4. The novel air-source heat pump composite heating system as described in claim 3, characterized in that: The heat storage layer is a phase change energy storage material layer, and the insulation layer is an aluminum silicate insulation material layer.

Images