Experiment study on heat storage and heat dissipation coupling characteristics of active phase change radiators

Abstract

Solar power generation and collector systems are intermittent, but building heating is usually full-time operation. Therefore, it is necessary to carry out spatial storage and time period conversion of energy to achieve space-time coordination of building energy consumption. In order to solve the contradiction of energy consumption in time and space, the storage and heating performance of radiators with phase change heat storage function are studied. The heat storage efficiency and latent heat ratio are analyzed by changing the heating power, phase change materials, surface emissivity and the improved radiator. The latent heat ratios are 45.56 %, 41.62 % and 37.45 % at heating power of 200,300 and 400 W for the gridless phase change radiator, respectively, the heat storage efficiency increase with the increase of power. A new type of GPCR was designed and the temperature distribution of phase change materials in the cavity is more uniform. The melting time is increased by 24.5 %, and the latent heat ratio is increased by 7.14 %. The energy density stored in unit time is higher and the heat storage efficiency is improved. Low-temperature phase change material melts more quickly and the total latent heat is the same and the total sensible heat is significantly reduced, the latent heat ratio is increased by 6.84 %. The differences in ambient temperature and surface emissivity only affect the speed of heat dissipation and heat storage, and not affect the total sensible heat and latent heat when fully melted. Changing power, using new radiators and low-temperature phase change materials can improve heat storage efficiency and latent heat ratio.