Experimental and Numerical Simulation Research on Solar Phase Change Heat Storage Kang
In order to realize the rapid temperature rise of solar energy phase change heat storage Kang,capillary network and high thermal conductivity composite phase change ma-terial are used to improve the thermal response time of the Kang,and the thermal perform-ance of the Kang is studied by combining numerical simulation with experimental research.In this paper,the DSC curves of paraffin with different melting points are compared,and 35#paraffin is selected as the research object.The paraffin-expanded graphite composite shape-stabilized phase change materials with different proportions are prepared by melt mixing method,and the best proportion is determined by leakage test.The experimental results show that when the mass fraction of expanded graphite is 8％,the leakage rate of the composite shape-fixing phase change material is low,which is the best ratio for both heat storage and thermal conductivity.The paraffin composite phase change material is ap-plied to the solar energy phase change heat storage Kang,and a three-dimensional unsteady heat transfer model is established by CFD,and the 24-hour heating simulation design of the Kang body is carried out.The simulation results show that the temperature of the solar energy phase change heat storage Kang reaches 24.2℃ in the daytime and 30.2℃ at night.Through the operation simulation of the combined system by Trnsys(transient system simulation program)software,it is found that the combined system can reach the designed 45℃ and above;In addition,the combined system saves 2974.7 kW·h of electricity,or saves 469.9 kg of standard coal,or reduces 1 240.5 kg of carbon diox-ide,70.9 kg of carbon monoxide,106.8 kg of PM,etc.,with remarkable energy saving and emission reduction.
万方数据
维普
