Application of Plate Heat Exchanger for Low Temperature Lift Heat Pump Systems
نویسندگان
چکیده
Title of Document Application of Plate Heat Exchanger for Low Temperature Lift Heat Pump Systems Song Li, Master of Science, 2012 Advisor Professor Reinhard Radermacher, Department of Mechanical Engineering In this thesis I investigated the energy saving potential of a low temperature lift heat pump (LTLHP) such as water source heat pump (WSHP), and studied the utilization of a plate heat exchanger (PHE) as the LTLHP evaporator. Due to the facility limitation, I only tested and studied the evaporator for LTLHP. Since the LTLHP requires a large water flow rate, its heat source liquid-to-refrigerant PHE is operated at lower refrigerant mass flux than typical applications. I varied the vapor quality, heat flux, evaporation pressure, and refrigerant mass flux to provide unique heat transfer characteristics, and I studied their effects on evaporation heat transfer. Based on the collected data, I concluded that at a low mass flux range, evaporation heat transfer is dominated by nucleate boiling, and convective boiling has mall influence. In addition, I carried out a simulation to compare the performance of WSHP with air source heat pump (ASHP). Application of Plate Heat Exchanger for Low Temperature Lift Heat Pump Systems
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