Solar heat pump system based on phase change heat storage

Abstract

The invention provides a solar heat pump system based on phase change heat storage. The solar heat pump system based on phase change heat storage comprises a hot water system and a heat pump system. The hot water system comprises an evacuated tubular solar heater, a water pump and a heat insulation tank. The water pump is in closed-loop connection with the evacuated tubular solar heater and the heat insulation tank through a pipeline in sequence. The evacuated tubular solar heater is filled with a liquid medium and stores solar energy absorbed by the evacuated tubular solar heater in the liquid medium. The heat pump system comprises a condenser, an expansion valve, an evaporator and a compressor. The compressor is in closed-loop connection with the condenser, the expansion valve and the evaporator through a pipeline in sequence. The evaporator is located in the heat insulation tank. An inlet and an outlet of the evaporator are located in a shell of the heat insulation tank. The heat insulation tank is filled with functional hot fluid. The evaporator and the liquid medium are made to conduct heat exchange through the functional hot fluid. The solar heat pump system based on phase change heat storage can prevent frosting in winter. The performance of the COP solar heat pump system can be improved.

Description

technical field [0001] The invention relates to the fields of air conditioning and solar energy applications, in particular to a solar heat pump system based on phase change heat storage. Background technique [0002] At present, the problem of global energy depletion and environmental pollution is becoming more and more serious. Energy has become the lifeblood of economic development, and no country in the world can maintain a steady rise in national strength when energy supply is insufficient. China is the world's largest developing country and the world's second largest energy consumer. China's per capita energy consumption is also rising. In 1953, China's per capita energy consumption was 0.09 tons of standard coal. In 2005, China's per capita energy consumption The volume is 1.71t of standard coal, and by 2016 this figure has reached 3.16t. Therefore, energy conservation problem just seems particularly important. [0003] When the known air source heat pump works in ...

AI Technical Summary

Problems solved by technology

Problems in this system: the structure is relatively complex, the process is difficult to realize, and the cost is high. For the energy storage process of phase change materials, the efficiency of the energy discharge process is low, and frosting is easy to occur when the air source heat pump is heating in winter.

Problems in this system: direct addition of phase change materials, incompatibility between media, and corrosion of phase change materials make it technically difficult to add phase change materials to the original system

These three systems have great similarities. The problem is that the efficiency of energy storage and energy discharge is not high, and the amount of heat stored in the system is limited by the size of the evaporator.

There are problems in this system: the preparation technology of nanofluid is high, and the stability of the prepared nanofluid is not good

Problems in this system: the heat pipe processing technology is difficult, the cost is high, and the heat transfer efficiency of this system is limited

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