Spiral Finned Tube Heat Exchanger Performance Tests And Computer-aided Testing

Slot-helix finned tube heat exchanger is a new type heat exchanger, which heat transfer is greatly enhanced and is abroad used in many fields. So it is important to study the heat transfer and friction characteristics of the slot-helix finned tube heat exchanger. In recent years, as a new method, the Computer Aided Testing (CAT) is being used in many fields. Applying the method of Computer Aided Testing (CAT) into the heat exchanger experiment can improve experiment efficiency.In this paper, the status of the research and development of the finned tube heat exchangers and the type of the heat exchangers and the basic equation of heat transfer is introduced. Also the efficiency of the fin is detailedly analyzed in theory.Some experiments have been carried out in order to investigate the heat transfer and flowing characters of the slot-helix finned tube. The curves and corresponding correlation of the Nusselt numbers and friction factors (Nu-Re , Eu~Re ) of the fin side are obtained. Compared with the helix finned tube heat exchanger, the heat transfer of the slot-helix finned tube heat exchanger is greatly enhanced but the flowing resistance increases a little.Computer Aided Testing (CAT) is applied into the heat exchanger experiment. Mathematic model of heat transfer is set up and numerical calculate program is designed. Then the heat transfer coefficient of the fin side and some data of changing working conditions are obtained through experiment using the Computer aided test (CAT).At the last of this paper, all the work has been down is summarized, the way of developing and improving of the heat exchanger is put forward.