Study On Heat Transfer Characteristics Of Ice-on-Coil Design Of Cold Air Distribution System

Ice thermal storage air conditioning system runs the chillers to build ice during the off-peak time of the electric power transmission-line system, and then melts the ice to meet the requirement of air conditioning load of the building in the on-peak periods. The cooling storage technology enhances the efficiency of energy utilization and optimizes the resource configuration so that it is a great significant for the "shift on-peak power to off-peak periods " and national economy development.The article overviews the ice thermal storage technology. Based on the study of the charge and discharge course of the ice storage equipment and the cold air distribution system, a concept of incomplete-frozen is suggested. A new material-conductive plastic is developed to make the incomplete- frozen ice coil, which can satisfy the demand of the cold air distribution system.We built a mathematics model to analyze the incomplete-frozen conductive plastic ice coil, which can simulate both the processes of ice building and melting. Based on the study of how the inlet temperature and flow velocity of the secondary coolant and the thermoconductivity of the coil material affect the heat-conduction performance of the ice storage coil, we have designed and set up a new high- efficiency ice storage device. For comparing the performance of the charge and discharge phases between the incomplete-frozen and thecomplete-frozen.An ice thermal storage cold air distribution experiment system and a coil heat-conduction performance measuring equipment are set to test the relationship between the inlet/outlet temperature, flow velocity and the duration of building/melting during the processes of charge and discharge. The experimental parameters are analyzed via comparing the experimental results and the theoretical calculation. At the same time the cold air distribution system has been preliminary tested. The above results validates the rationality of the mathematics model and the feasibility of the system configuration.The production of this article has been applied to an ice thermal storage air conditioning system at the laboratory building in Jimei University. The experimental result proved the feasibility of the developed theory in this article and its technical & economical advantages. The result of this article can be used for a reference to engineering design.