Operation Parameter Effect Of Thermal Driving Subsystem For Solar Absorption-subcooled Compression Hybrid Cooling System

With the continuous development of economy and population,the problem of energy shortage is increasingly prominent.The development and utilization of clean energy has become an important way to solve this problem.The solar absorption-subcooled compression hybrid cooling system(SASCHCS)is an efficient and economical system.The effective application of this device can greatly reduce the energy consumption required for air-conditioning and refrigeration in high-rise buildings.Since the system does not have reheat equipment to raise the temperature of hot water,the performance of the absorption subsystem is greatly affected by the hot water flow and temperature due to the strong coupling between the absorption subsystem and the collector.So,this paper mainly conducts in-depth research and comparative analysis on the two operating modes of tracking the hot water setting flow rate and tracking the hot water setting temperature of the solar absorption-subcooled compression hybrid cooling system.Finally,based on the research results the guidelines for guiding the actual operation of the system has been put.The research results show that,under the operating mode of tracking hot water setting flow rate,a higher hot water flow rate of the collector helps to increase the useful heat of collector and the cooling power of absorption subsystem,thus increasing the saved power consumption of compressor.However,when the flow rate is more than 4 m~3/h(14.81 kg/m~2h),the continuous increase of the flow rate has little effect on these parameters.With the increase of the generator hot water flow rate,the COP of absorption subsystem and the useful heat of collector and the cooling power of absorption subsystem and the saved power consumption of compression are increased.However,when the flow rate increases to 6 m~3/h(22.22 kg/m~2h),the saved power consumption of compressor by the continuous increase of the flow rate is almost no longer increased.Therefore,when considering the power consumption of water pumps,the results of genetic algorithm show that the optimal collector hot water flow rate and the generator hot water flow rate are 3.6 m~3/h(13.33 kg/m~2h)and 5.2 m~3/h(19.26 kg/m~2h),respectively.At this time,the electric energy saved by the collector per square meter per year is 32.73 k Wh/m~2,and the ratio of the collector hot water flow rate to the generator hot water flow rate is 1.44.Under the operating mode of hot water setting temperature,the optimization results of genetic algorithm show that the optimal set temperature of collector hot water and generator hot water is 71.6°C and 64.5°C respectively without considering the power consumption of water pumps.Considering the power consumption of water pump,the optimal set temperature of collector hot water and generator hot water is 79.7°C and 69.6°C.Through the comparison of tracking the hot water setting flow rate and tracking the hot water setting temperature operation under the optimal condition,it can be known that tracking the hot water setting flow rate operation is more conducive to improving the power saving.This paper is helpful to improve the performance of the solar absorption-subcooled compression hybrid cooling system.