Solar high temperature phase change large capacity heat storage air source heat pump system and its defrosting method

Abstract

The invention discloses a solar high-temperature phase change mass memory heat storage air source heat pump system and a defrosting method thereof. The system comprises a solar high-temperature phase change mass memory heat storage circular system and the like. The solar high-temperature phase change mass memory heat storage circular system comprises a heat storage pump, a heat storage pipeline and a solar energy collector; the high-temperature phase change mass memory exothermic defrosting system comprises a high-temperature phase change mass memory heat reservoir, a defrosting pipeline, a defrosting pump and an outdoor evaporator; the outdoor evaporator comprises an evaporation defrosting pipe bundle, the evaporation defrosting pipe bundle comprises an inner evaporation pipe bundle, a defrosting pipe bundle and an outer evaporation pipe bundle; the air source heat pump heating circular system comprises an indoor condenser, a gas replenishing and enthalpy increasing compressor, an outdoor evaporator, a main circuit loop pipeline, a main circuit loop throttling valve, an economizer, a bypass pipeline and a bypass throttling valve. According to the defrosting method, clean and reproducible solar energy is utilized to conduct defrosting rapidly and efficiently all day long, the energy consumption of the system is reduced, and the requirement for defrosting in an extreme weather can be met, the comfort of heating can be ensured, and better services can be provided for switching from coal to electricity in the north.

Description

technical field [0001] The invention relates to a solar heat storage system and its use method, in particular to a solar high-temperature phase change large-capacity heat storage air source heat pump system and its defrosting method. Background technique [0002] Air source heat pump is an energy-saving technology that has attracted much attention in the world in recent years. The European Union, Japan and other countries have already listed it as a renewable energy technology. As one of the technical measures, the Ministry of Housing and Urban-Rural Development of China officially included it in the category of renewable energy utilization technology in 2015. Air source heat pumps have become an important form of building energy in China and are widely used in cold and hot summer and cold winter regions in China. At present, air source heat pumps have been widely used in the "coal-to-electricity" transformation in the Beijing-Tianjin-Hebei region. It can be seen that air so...

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Problems solved by technology

[0002] Air source heat pump is an energy-saving technology that has attracted much attention in the world in recent years. The European Union, Japan and other countries have already listed it as a renewable energy technology. As one of the technical measures, the Ministry of Housing and Urban-Rural Development of China officially included it in the category of renewable energy utilization technology in 2015. Air source heat pumps have become an important form of building energy in China and are widely used in cold and hot summer and cold winter regions in China. At present, air source heat pumps have been widely used in the "coal-to-electricity" transformation in the Beijing-Tianjin-Hebei region. It can be seen that air source heat pumps, as an efficient renewable energy utilization technology, have broad application space and value in China. Air source heat pumps use ambient air as low temperature Heat source, China’s GB12021.3-2010 and other relevant standards stipulate that when it operates under nominal conditions (dry bulb temperature of outdoor ambient air is 7°C, wet bulb temperature is 6°C), for every 1 degree of electricity consumed, 1.9 -2.6 times of low-level heat, and provide users with 2.9-3.6 times of high-level heat. Currently, under nominal conditions, the performance of air source heat pumps is satisfactory, but during actual operation in winter nights, due to the often low outdoor ambient temperature If the temperature is lower than 0°C, frosting will appear on the surface of the outdoor heat exchanger, especially in areas with humid winter climate, where the humidity in the air is high and frosting is easy. The air source heat pump faces the problem of frequent frosting, which not only results in poor heat exchange effect , and defrosting leads to increased energy consumption, which seriously restricts the application and development of air source heat pumps in China. At present, the most mature technology for air source heat pump defrosting is reverse defrosting, that is, the heating process is converted through the four-way reversing valve. The indoor heat exchanger is used as the evaporator, and the outdoor heat exchanger is used as the condenser. The working medium evaporates indoors to absorb the high-temperature heat energy of the indoor air. Frosting on the surface of the heater, this method needs to consume a lot of indoor heat to defrost the outdoor heat exchanger, and frequent defrosting will cause insufficient indoor heating, resulting in a substantial increase in building energy consumption, which also leads to air source heat pumps The effect of energy saving and emission reduction is reduced, and the advantages are reduced

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