| In the course of many years of experiment,most of the exploration of solid adsorption refrigeration focused on the improvement of the performance of the system refrigerant,the optimization of the main components in the system and so on.But there are few studies on the way in which the system is available.Mostly in the study of flat-type finned tube solid adsorption refrigeration system,the system directly using the radiation of solar heating finned tube,the system to provide heat.There is also a small amount in the study of water bath refrigeration device,the device uses the collector to heat the hot water,and then hot water to heat the finned tube,without direct use of light energy but the light energy into heat reuse.In view of this situation,this paper designs and constructs a kind of oil-bath type solid adsorption refrigeration system based on the solar energy hot oil supply,which can not only solve the problems existing in the traditional flat-type finned tubular solid adsorption refrigeration system,but also solve the water bath Adsorption refrigeration system problems.From the aspects of system structure and performance optimization,this paper has carried out the following research work:(1)From the point of view of optimizing the refrigeration performance of the system,a set of research devices for the solid adsorption refrigeration system composed of adsorbent bed,evaporator,heat preservation tank,condenser,liquid storage bottle and cooling box are designed and calculated,and completed the system construction and operation debugging.(2)According to the design of the finned tube type solar oil bath solid adsorption refrigeration system,the finned tube adsorption bed was placed in the thermal insulation tank,and the hot oil bath was used for the heating solution/ adsorption.The experimental results showed that the adsorption bed was 110?,115?,120? and 125?,respectively.The temperature distribution and characteristics of the system were 4h,5h and 6h,respectively.(3)The electric energy is used to simulate the solar heating as the driving heat source,and the adsorbent bed placed in the holding tank is heated in the desorption stage to desorb the refrigerant in the finned tube.The relationship between desorption temperature and duration and system refrigerant desorption was studied.The results show that the desorption temperature has a great influence on the performance of the oil-bath solid adsorption refrigeration system,and the higher desorption temperature in the heating stage is favorable for desorbing the refrigerant.Prolonging the desorption time can increase the system's ice production and cooling capacity,but at the same time the system desorption gradually decreases and the system heat dissipation increases,and the heat absorbed by the system is gradually increasing,Resulting in a decrease in the system's cycle COP and thermal usage.(4)The effect of solar solid adsorption refrigeration system on the COP and SCE of the system was investigated when the desorption temperature was 120? and the desorption time was 5h under the conditions of 11?,18? and uncontrolled condensing temperature respectively.The cooling performance of the system becomes better with the decrease of the condensation temperature.When the condensation temperature is 11? and 18?,the difference between the COPs of the system is small,but the circulating COP at the condensation temperature of 18? is 21.6% higher than the uncontrolled condensing temperature.In this paper,the proposed solar oil bath solid adsorption refrigeration system,to ensure stable cooling output at the same time can also provide users with a certain temperature of hot water.The cooling rate and performance improvement of the system are mainly studied.The results of the study provide the basic theoretical guidance and experimental reference for the further improvement and research of the refrigeration system. |
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