Research On Absorption And Compression Hybrid Cycle Heat Pump Based On Solar Energy

With building energy consumption growing increasingly, reducing heating and air conditioning energy consumption has become key point of dropping building energy consumption. In heating and air conditioning equipments, the electrically driven heat pump unit is dominant. Improving electrically driven heat pump’s coefficient of performance (COP) is important to reduce electric power peak and valley difference. Solar energy driven absorption heat pump has seasonal dominant advantage, can significanting reduce carbon emission and remit electric power peak and valley difference, but having instabilility and lower efficient characteristic. Based on solar energy, an absorption and compression hybrid system has been taken in this article, which has the advantage of absorption subsystem and compression subsystem respectively and make up shortcomings of them. The research content mainly includes:(1) Firstly, mechanical heat pump system’s advantage and disadvantage have been presented and utilization of solar energy, industrial waste heat and so on have been expounded. According to analyse status of mechanical heat pump and solar energy driven air conditioning, absorption and compression hybrid heat pump system is suitable for utilization of solar energy. At the same time, introduction of study satus of absorption and compression hybrid heat pump at home and abroad has been presented.(2) Secondly, multiple running modes of absorption and compression hybrid system in summer and winter are expounded. The software has been explored and is used to simulate thermal performance of cooling/heating cycle of the new absorption and compression hybrid system. It is analysised that hybrid cycle cooling/heating coefficient of performance (COP) and absorption subsystem COP vary with gerneration temperature, condensation temperature, evaporation temperature. Cooling/heating cycle performance of hybrid cycle is compared with that of comprssion subsystem. (3) An experimental setup for solar driven absorption and compression hybrid heat pump and its control system is constructed. Experimental research is performed for hybrid heat pump’s cooling/heating performance at different gerneration temperatures, condensation temperatures and evaporation temperatures. It obtained that hybrid cycle heat pump cooling (heating) capacity and cooling (heating) COP is always higher than compression subsystem with improving of generation temperature, condensation temperature and evaporation temperature. That hybrid cycle system is more advantage than single compression subsystem is proved.(4)Generator is an important component of absorption subsystem. Effect of mass flow rate of weak solution to generation heating performance is researched. An optimum weak solution circulation rate exists and is obtained. Meanwhile, the experiments for coefficient of heat convection of outside of the tubes with weak solution concentration and spray density have been carried out. It is obtained that coefficient of heat convection of outside of the tube is improved with increasing of weak solution concentration and spray density. Variation range of the coefficient of is150-365W/m2.℃.