CN204757399U - Compound heat pump heating water system of many heats source of waste heat recovery formula - Google Patents

Abstract

The utility model discloses a waste heat recovery multi-heat source composite heat pump water supply system, which includes three subsystems: a solar heat collection water supply system, a waste heat auxiliary system, and an air source heat pump water supply system. The solar heat collection water supply system at least includes a vacuum tube type The heat collector and the small water tank constitute the direct water supply main pipeline, and then form the auxiliary heating circuit with the plate-fin heat exchanger to realize the defrosting of the heat exchanger. , increase the inlet temperature of the compressor, improve the working efficiency of the compressor, and then form a defrosting circuit with the plate-fin heat exchanger, and realize the defrosting of the heat exchanger under no-light conditions such as night or cloudy days. The air source heat pump water supply system includes at least a compressor, a condenser, a liquid receiver, a dry filter, an expansion valve, a finned heat exchanger, a casing heat exchanger, and a gas-liquid separator to absorb air energy and heat cold water , directly to the user. The valves of the system control the opening and closing of each subsystem to realize the reliable operation of the system all-weather without seasonal restrictions, and the working temperature is as low as -10°C.

Description

A waste heat recovery multi-heat source composite heat pump hot water supply system

technical field

The utility model relates to a waste heat recovery type multi-heat source composite heat pump hot water supply system.

Background technique

China's current resource utilization rate is low, carbon emissions have risen linearly with economic development, and the problems of environmental pollution and resource shortage have become prominent. In the face of increasingly serious energy problems, in the national "Twelfth Five-Year Plan", the idea of energy development was put forward, emphasizing green development and building a resource-saving and environment-friendly society. The research on comprehensive utilization technology of solar energy and other renewable energy and the research and development of related equipment are important measures to achieve the goal of energy saving and consumption reduction. Effective collection of solar radiant energy, used for power generation, heating or cooling of rooms, will greatly reduce the energy consumption of buildings. At the same time, the resources of industrial waste heat are very rich, the potential for utilization is great, and the distribution is also very wide. A lot of waste heat has high temperature and stable heat carrier flow, which has good utilization conditions. Therefore, the utilization of low-temperature heat source heat has great practical significance. As the main force of the new energy industry, the solar energy industry has been pushed to the foreground, and the development and utilization of renewable energy—solar energy has made new progress in the world. Especially in terms of solar thermal utilization, solar energy and low-temperature waste heat (waste smoke, waste gas, waste water) have become the development direction of China's energy utilization, and have achieved good energy-saving effects. Air source heat pumps are seasonal and cannot effectively cope with complex working conditions. Therefore, various means such as solar energy, waste heat, and air source heat pumps are used to complement each other to solve the problem of insufficient hot water supply by a single heat pump system.

At present, the known main ways of producing hot water include the principles of solar energy supplying hot water, air source heat pumps supplying hot water, electric heating water heaters supplying hot water, and gas water heaters supplying hot water. Solar hot water supply mainly uses photovoltaic collectors to collect solar radiant energy, heat the cold water in the tank, and supply it to users. The tank is used to supply hot water at night, and the effect of the device is limited when the water consumption is large at night and the sunlight intensity is poor; the air source heat pump mainly uses the reverse Carnot principle to absorb a large amount of low-temperature heat energy in the air with very little electric energy. Compressed by the compressor, it becomes high-temperature heat energy, which is transmitted to the water tank to heat hot water. However, due to the seasonal climate, especially when the air temperature is low in winter, the evaporator frequently frosts, which affects the operation of the system, and even causes the heat pump to fail to operate. ; Electric water heaters use electric energy to directly heat hot water, which has high efficiency, but consumes electric energy, especially during the peak period of electricity consumption, which is likely to cause an imbalance in regional electric energy supply, and when the system flow is large, the heating effect is limited; gas water heaters directly use natural gas, The heat generated by the combustion of coal gas and other energy sources is used to heat cold water. The device starts quickly and is convenient and quick. However, burning natural gas consumes primary energy and emits a large amount of carbon dioxide at the same time, which aggravates the greenhouse effect. At present, the relatively successful hot water supply device adopts the composite system of solar energy and air source heat pump. Although it can better meet the needs of water supply when the sunlight is insufficient, it still cannot operate effectively in winter low temperature conditions such as the outdoor temperature of -10°C.

Utility model content

In order to overcome the poor seasonal adaptability of the existing hot water supply device, the limited temperature range of working conditions, and the inability to adapt to the lower outdoor temperature in winter, the utility model provides a waste heat recovery type multi-heat source composite heat pump water supply system, which adopts Solar energy, waste heat and air source heat pumps complement each other to achieve all-weather and no seasonal restrictions. Even if the working temperature is as low as -10°C, the system can also ensure efficient operation.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a waste heat recovery type multi-heat source composite heat pump water supply system, including solar heat collection water supply system, waste heat auxiliary system and air source heat pump water supply system, waste heat auxiliary system It is connected in parallel with the air source heat pump water supply system, which is used to realize the preheating of the working medium of the heat pump system by using waste heat resources. It can directly supply hot water alone or be connected in parallel to the air source heat pump water supply system to defrost the heat exchanger of the heat pump system.

The air source heat pump water supply system includes at least a gas-liquid separator, a compressor, a condenser, a liquid receiver, a dry filter, an expansion valve, a finned heat exchanger with a defrosting channel, and a casing heat exchanger connected in series. The condensers are connected in series to form a main heat supply circuit, and the cold water inlet of the heat pump water supply system on the condenser communicates with the liquid reservoir.

The solar heat collection water supply system has two pipelines, one pipeline is a direct water supply main pipeline composed of a circulating water pump, a vacuum tube collector and a water tank in series, and the other is managed by a vacuum tube collector, a water tank, and a water tank. The finned heat exchanger of the frost channel and the side branch pipeline valve of the solar heat collection water supply system are connected in series to form a side branch pipeline. The side branch pipeline is connected in parallel with the direct water supply main pipeline. The valve of the main circulation pipeline of the hot water supply system, the hot water outlet pipeline of the solar thermal water supply system, the valve of the hot water pipeline directly supplied to users by the solar thermal water supply system, the hot water outlet of the heat pump water supply system on the condenser is directly connected with the solar thermal water supply system The hot water pipe valve for the user is connected, and the cold water inlet pipe of the solar heat collection water supply system is also connected between the main circulation pipe valve and the circulating water pump of the solar heat collection water supply system.

The waste heat auxiliary system has two pipelines, one pipeline is at least connected in series with the casing heat exchanger to preheat the working fluid of the heat pump system, and the other pipeline is connected in series with at least one bypass pipe valve of the waste heat auxiliary system and the The finned heat exchanger of the channel is used to realize the defrosting of the casing heat exchanger, and an input end of the main circulation pipeline valve of the waste heat auxiliary system is connected to the waste heat medium inlet through the main circulation pipeline valve of the waste heat auxiliary system, One output end of the main circulation pipeline valve of the waste heat auxiliary system is connected to the waste heat medium outlet, and one end of the side branch pipeline valve of the waste heat auxiliary system is connected between the waste heat medium inlet and the main circulation pipeline valve of the waste heat auxiliary system.

The main operation mode of the waste heat recovery multi-heat source compound heat pump hot water supply system is as follows:

When the weather is fine and the light is sufficient, only the solar thermal water supply system is turned on, and the vacuum tube solar water heater is used to collect heat, heat the cold water to 55°C, and directly supply users;

When the weather is bad, the light intensity is low, and the solar thermal water supply system alone cannot meet the needs of users, the solar thermal water supply system, the air source heat pump water supply system and the waste heat auxiliary system are turned on at the same time, and the heat pump water supply system uses the compressor to heat the circulating working fluid , and then the working fluid exchanges heat with the cold water in the condenser, so that the water in the water tank reaches the outlet water temperature requirement (55°C), and the solar energy can also provide part of the hot water. When the evaporator is frosted during operation, the system will feedback and adjust to open the valve of the side branch of the solar pipeline, so that the remaining water in the solar energy that is not too high in temperature flows to the evaporator to defrost the fins of the evaporator. When the evaporator is not frosted, it is not necessary to open the defrosting valve. The main circulation valve of the waste heat auxiliary system is opened, and the valve of the side branch pipeline is closed. Use waste heat resources (such as industrial waste heat, cooling water of thermal power plants, etc.) The smaller the ratio, the higher the operating efficiency of the system.

When there is no light, turn on the air source heat pump water supply system and waste heat auxiliary system, turn off the solar collector water supply system, the heat pump water supply system will operate as usual, heat the cold water in the water tank, and the waste heat auxiliary system will turn on the working fluid flowing out of the waste heat evaporator through the main valve. When the evaporator is frosted during the operation of the heat pump system, the valve of the side branch pipeline of the waste heat system is opened, and the waste heat medium enters the defrosting channel of the evaporator to defrost to ensure the operation of the system.

Compared with the prior art, the utility model has the following advantages: the beneficial effect of the utility model is that while ensuring the hot water supply of the system, it can adapt to complex working conditions, especially when the solar energy is limited, the utility model adopts solar energy, waste heat and air The source heat pump is complementary, and the system operates around the clock without seasonal restrictions, and the working temperature reaches -10°C.

Description of drawings

Fig. 1 is the system schematic diagram of the present utility model;

Explanation of reference signs: 1-vacuum tube heat collector, 2-water tank, 3-waste heat medium inlet, 4-side branch pipeline valve of waste heat auxiliary system, 5-waste heat medium outlet, 6-main circulation pipeline valve of waste heat auxiliary system, 7- Tube heat exchanger, 8-gas-liquid separator, 9-compressor, 10-hot water outlet of heat pump water supply system, 11-cold water inlet of heat pump water supply system, 12-condenser, 13-liquid receiver, 14-drying Filter, 15-expansion valve, 16-finned heat exchanger with defrosting channel, 17-side branch pipeline valve of solar collector water supply system, 18-solar collector water supply system direct supply hot water pipe valve for users, 19- Hot water outlet pipe of solar thermal water supply system, 20-main circulation pipeline valve of solar thermal water supply system, 21-cold water inlet pipe of solar thermal water supply system, 22-circulating water pump, 23-loop valve of solar thermal water supply system.

Detailed ways

The content of the present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example:

In Figure 1, a waste heat recovery multi-heat source compound heat pump water supply system is composed of three subsystems, which are solar heat collection water supply system, waste heat auxiliary system, air source heat pump water supply system, waste heat auxiliary system and air The source heat pump water supply system is connected in parallel, which is used to realize the preheating of the working medium of the heat pump system by using waste heat resources. Directly supply hot water or connect it in parallel to the air source heat pump water supply system to defrost the heat exchanger of the heat pump system. The specific connection relationship of the above three subsystems is as follows:

The air source heat pump water supply system includes a gas-liquid separator 8, a compressor 9, a condenser 12, a liquid receiver 13, a dry filter 14, an expansion valve 15, and a finned heat exchanger 16 with a defrosting channel connected in series in sequence 1. The casing heat exchanger 7 is connected in series to form a heating main circuit, and the cold water inlet 11 of the heat pump water supply system on the condenser 12 is communicated with the liquid reservoir 13;

The solar heat collection water supply system has two pipelines, one pipeline is a direct water supply main pipeline composed of circulating water pump 22, vacuum tube heat collector 1 and water tank 2 in series, and the other is managed by vacuum tube heat collector 1, The water tank 2, the finned heat exchanger 16 containing the defrosting channel, and the side branch pipeline valve 17 of the solar heat collection water supply system are connected in series to form a side branch pipeline. It is also connected in turn with the main circulation pipeline valve 20 of the solar thermal water supply system, the hot water outlet pipeline 19 of the solar thermal water supply system, the direct supply hot water pipeline valve 18 of the solar thermal water supply system, and the heat pump water supply system on the condenser 12. The hot water outlet 10 is connected to the hot water pipe valve 18 of the solar thermal water supply system directly to users, and the cold water inlet pipe 21 of the solar thermal water supply system is also connected between the main circulation pipeline valve 20 and the circulating water pump 22 of the solar thermal collector water supply system.

The waste heat auxiliary system has two pipelines. One pipeline is connected in series with at least the casing heat exchanger 7 to preheat the working medium of the heat pump system. The finned heat exchanger 16 of the channel is used to realize the defrosting of the sleeve heat exchanger 7, and an input end of the main circulation pipeline valve 7 of the waste heat auxiliary system is connected to the The waste heat medium inlet 3, one output end of the main circulation pipeline valve 7 of the waste heat auxiliary system is connected to the waste heat medium outlet 5, and one end of the side branch pipeline valve 4 of the waste heat auxiliary system is connected between the waste heat medium inlet 3 and the main circulation pipeline valve 6 of the waste heat auxiliary system .

The following are the working modes of each subsystem:

The solar thermal water supply system includes the following two working modes:

Working mode of direct hot water supply: the valve 18 of the hot water pipe directly supplied to users in the solar thermal water supply system is opened, the valve 20 of the main circulation pipeline of the solar thermal water supply system is opened, the loop valve 23 of the solar thermal water supply system is opened, and the other valves are closed; the cold water is supplied by The cold water inlet pipe 21 of the solar heat collection water supply system flows in, flows through the circulating water pump 22, is heated to a suitable temperature by the vacuum tube heat collector 1, and then flows into the water tank 2 in turn, and the hot water outlet pipe 19 of the solar heat collection water supply system is connected with the solar heat collection water supply system. The system directly supplies the user with the hot water pipe valve 18, which forms the main pipeline of the solar heat collection water supply system, and is finally used for direct supply of hot water.

Defrosting working mode: Finned heat exchanger 16 with defrosting channel, side branch pipeline valve 17 of solar heat collection and water supply system, connected in series to form side branch circuit of solar heat collection and water supply system, connected in parallel to the main circuit of solar heat collection and water supply system, for When the finned heat exchanger 16 is frosted, the side branch pipe valve 17 of the solar heat collection water supply system is opened, the main circulation pipe valve 20 of the solar heat collection water supply system, and part of the hot water flows into the defrosting channel for defrosting.

The waste heat auxiliary system includes the following working modes:

Preheating working mode: the valve 6 of the main circulation pipeline of the waste heat auxiliary system is opened, the waste heat medium flows in from the waste heat medium inlet 3, passes through the valve 6 of the main circulation pipeline of the waste heat auxiliary system, and works with the water supply system of the air source heat pump in the casing heat exchanger 7 Mass heat exchange, and then flow out from the waste heat medium outlet 5 to complete the main circuit of the waste heat auxiliary system, the main function is to preheat the working fluid of the heat pump system at the outlet of the finned heat exchanger 16.

Defrosting working mode: the valve 4 of the side branch pipeline of the waste heat auxiliary system is opened, and when the solar collector water supply system cannot supply heat and the finned heat exchanger 16 is frosted, the waste heat medium flows in from the waste heat medium inlet 3 and passes through the side branch of the waste heat auxiliary system. The pipeline valve 4 flows into the defrosting channel of the finned heat exchanger 16 to achieve defrosting, and then flows out through the waste heat medium outlet 5, and is connected in series to form a bypass circuit, which is connected in parallel to the main circuit of the waste heat auxiliary system. The main function of this circuit is to Defrosting of the finned heat exchanger 16.

Air source heat pump water supply system: the working medium of the air source heat pump water supply system first flows through the gas-liquid separator 8, after gas-liquid separation, the gas enters the compressor 9 to achieve compression and temperature increase, and then flows into the condenser 12 to exchange with the cold water in the condenser The cooled working medium passes through the hot water reservoir 13, the dry filter 14, and the expansion valve 15 to realize throttling and cooling, restores normal pressure, and then flows through the finned heat exchanger 16 and the casing heat exchanger. 7 to realize the preheating of the working medium, and finally return to the gas-liquid separator 8 to complete the cycle. The cold water enters from the cold water inlet 11 of the heat pump water supply system, is heated in the condenser 12, and flows out from the hot water outlet 10 of the heat pump water supply system to directly supply users.

The solar thermal water supply system, waste heat auxiliary system, and air source heat pump water supply system are opened and closed through the control system of each valve to realize the combined operation of the three major systems, ensuring reliable operation of the system all-weather and without seasonal restrictions, and the working temperature is as low as -10°C.

The above detailed description is a specific description of the feasible embodiments of the utility model. This embodiment is not used to limit the patent scope of the utility model. Any equivalent implementation or change that does not deviate from the utility model shall include within the patent scope of this case.

Claims (4)

1. the compound heat pump hot water supply system of afterheat recovery type multi-heat source, it is characterized in that: comprise the solar energy heating water system for defrosting to heat pump heat exchanger, utilize residual heat resources to realize waste heat accessory system, air source heat pump water system that the preheating of heat pump working medium realizes heat pump heat exchanger defrosting effect simultaneously, waste heat accessory system is in parallel with air source heat pump water system, and solar energy heating water system can direct-furnish hot water or be connected in parallel in air source heat pump water system separately.

2. the compound heat pump hot water supply system of a kind of afterheat recovery type multi-heat source according to claim 1, it is characterized in that: air source heat pump water system at least comprises the gas-liquid separator, compressor, condenser, reservoir, device for drying and filtering, expansion valve, the finned heat exchanger containing defrost passage, the double pipe heat exchanger series connection formation heat supply major loop that are sequentially connected in series, and the heat pump water system cooling water inlet on condenser is communicated with described reservoir.

3. the compound heat pump hot water supply system of a kind of afterheat recovery type multi-heat source according to claim 2, it is characterized in that: solar energy heating water system has two pipelines, article one, pipeline is by water circulating pump, the direct-furnish water main line that vacuum tube type heat collector and water tank are followed in series to form, another management is by vacuum tube type heat collector, water tank, containing the finned heat exchanger of defrost passage, solar energy heating water system two bypass conduits valve connect successively formed collateral branch's pipeline, collateral branch's pipeline is connected in parallel on described direct-furnish water main line, the pipeline at water circulating pump place is also connected with solar energy heating water system major cycle pipeline valve in turn, solar energy heating water system hot-water outlet conduits, solar energy heating water system Firsthand Users hot water pipeline valve, heat pump water system hot water outlet on described condenser is connected with solar energy heating water system Firsthand Users hot water pipeline valve, solar energy heating water system cooling water inlet pipeline is also connected with between solar energy heating water system major cycle pipeline valve and water circulating pump.

4. the compound heat pump hot water supply system of a kind of afterheat recovery type multi-heat source according to claim 3, it is characterized in that: waste heat accessory system has two pipelines, article one, pipeline is at least connected described double pipe heat exchanger, preheating is realized to heat pump working medium, another pipeline, an at least series connection waste heat accessory system two bypass conduits valve and the finned heat exchanger containing defrost passage, for realizing the defrosting of double pipe heat exchanger, waste heat medium entrance is connected to by waste heat accessory system major cycle pipeline valve at an input of described waste heat accessory system major cycle pipeline valve, one output of waste heat accessory system major cycle pipeline valve is connected to waste heat media outlet, one end of described waste heat accessory system two bypass conduits valve is connected between waste heat medium entrance and waste heat accessory system major cycle pipeline valve.