Study On Heat Transfer Characteristics Of Conductive Plastic Ice-on-Coil

Nowadays, power is in short supply all over the world, especially in China. Ice storage air conditioning system has been used more and more widely due to its simple structure and outstanding social and economic benefits. Among all the ice storage systems, internal-melt ice-on-coil has been widely used because of its high reliability and relatively high charging and discharging rate.Thermal conductivity of tube material plays an important role in heat transfer characteristics of ice-on-coil. Nowadays, such metal as steel has been widely used as tube material, but the corrosiveness of secondary refrigerant (glycol water) to metal tube has negative effect on the long-term stability.This paper proposes to use a kind of novel conductive plastics instead of steel as tube material. In comparison with steel, novel conductive plastics have good anti-corrosiveness and their thermal conductivity is much higher than that of common plastics.In order to study the heat transfer characteristics of conductive plastic ice-on-coil, the following works have been done in this paper:1. A numerical model of the heat transfer characteristics of conductive plastic ice-on-coil has been developed during both charging and discharging periods. The impacts of thermal conductivity on the heat transfer characteristics of ice-on-coil have been analyzed by using this model.2. An experimental apparatus is built up to study its heat transfer characteristics and to verify the numerical model.3. Comparison between metal ice-on-coil and conductive plastic ice-on-coil has been made in their heat transfer property, flow pressure drop, installation, processingmethod and price.4. Comparison between "partial charged" method and "fully charged" method of internal-melt ice-on-coil in their heat transfer property during both charging and discharging periods has also been made.5. The impacts of inlet temperature of ice-on-coil and mass flowrate of secondary refrigerant during both charging and discharging periods have been analyzed.In the end, the summary of this paper is also given.