The Thermal Stability of Bi-Pb-Sn-Cd Heat Transfer Fluid

The charge and discharge process of heat transfer fluid in the solar thermal power generation system was simulated. A thermal cycle test repeated between high temperature and low temperature was put on prepared Bi-Pb-Sn-Cd low-melting-point alloy. The thermal physical performance tests were put on the alloy samples which experimented with 200, 400 and 800 times thermal cycle test respectively. The test results show that the specific heat capacity of alloy sample declines slowly and the thermal conductivity increases slowly. The phase change temperature of alloy increases slightly and latent heat decreases slightly with the thermal cycle continuing.