一种混合吸附剂及其吸附制冷系统的研究
发布时间：2018-12-08 12:53
【摘要】：随着全球节能环保需求的增加,能够利用太阳能、工业余热、废热等低品位能源驱动的吸附式制冷技术成为工业界和学术界的研究热点。物理吸附工质对中的制冷剂主要包含纯净水和醇类,其优点是不易燃易爆、对环境无污染,能够降低对人类生活空间的不利影响;同时物理吸附工质对很少出现随着吸附循环次数的增加吸附性能衰减的现象。吸附制冷工质对的吸附特性对系统的制冷性能影响很大,但是由于吸附工质对的种类和生产规格不一,造成吸附性能和吸附方程各不相同,给吸附制冷系统的设计和运行造成了很大影响。针对此种现象本文对硅胶-水、活性炭-乙醇、分子筛-水和一种混合吸附工质对的物理吸附性能进行比较分析,并对以混合吸附工质对为基础的双床吸附制冷系统进行了研究。首先搭建了吸附工质对吸附性能测试试验台,通过对四组吸附工质对进行测试,比较分析解吸温度对吸附工质对解吸量和解吸速度的影响,并拟合出其各自吸附方程。利用Matlab编写吸附工质对静态循环性能测试程序,模拟温度与压力的对应数值,吸附终了温度、解吸终了温度、蒸发温度和冷凝温度对吸附工质对静态热力性能的影响。利用Matlab/simulink搭建吸附工质对动态吸附循环模型,模拟出系统循环的性能参数,并与静态参数对比,验证动态模型的可行性,同时找出吸附工质对对应的最佳循环周期和驱动热源温度。利用Matlab/simulink搭建吸附工质对对应的动态吸附循环通用simulink程序,可以方便其它吸附工质对的动态热力性能预测。根据吸附工质对的静态和动态热力性能分析,确定复合吸附工质对合适的工作温度区间和最佳循环周期,利用实验拟合得到的吸附方程,设计出连续吸附制冷系统的吸附床、降膜蒸发器和盘管式冷凝器。最后利用各个部件的参数对连续吸附制冷系统进行了仿真运行,发现当蒸发器进水口温度是15℃时,制冷功率可以达到3kW,系统COP达到0.5,满足低温热源驱动的吸附式制冷机系统设计参数要求。
[Abstract]:With the increase of global energy saving and environmental protection demand, adsorption refrigeration technology, which can utilize solar energy, industrial waste heat, waste heat and other low-grade energy, has become a research hotspot in industry and academia. The refrigerants in the physical adsorption working fluid pair mainly contain pure water and alcohols, the advantages of which are not flammable and explosive, no pollution to the environment, and can reduce the adverse effects on human living space. At the same time, the physical adsorptive working pairs rarely appear the phenomenon of adsorption performance decay with the increase of the number of adsorption cycles. The adsorption characteristics of adsorption refrigerant pairs have a great influence on the refrigeration performance of the system. However, due to the different types and production specifications of adsorptive refrigerant pairs, the adsorption properties and adsorption equations are different. It has great influence on the design and operation of adsorption refrigeration system. The physical adsorption properties of silica gel-water, activated carbon-ethanol, molecular sieve-water and a mixture of adsorbents were compared and analyzed in this paper. The dual-bed adsorption refrigeration system based on the working pairs of mixed adsorbents was studied. At first, a test rig was set up to test the adsorption properties of adsorbed working fluids. The effects of desorption temperature on the desorption capacity and desorption rate were compared and analyzed, and their respective adsorption equations were fitted out. The static cycle performance of adsorbent was tested by Matlab. The corresponding values of temperature and pressure were simulated, and the effects of adsorption end temperature, desorption end temperature, evaporation temperature and condensation temperature on the static thermal performance were simulated. The dynamic adsorption cycle model is built by using Matlab/simulink. The performance parameters of the system are simulated and compared with the static parameters to verify the feasibility of the dynamic model. At the same time, the optimum cycle period and driving heat source temperature of the adsorbent pair were found out. The general simulink program for the dynamic adsorption cycle of adsorbent pairs is constructed by using Matlab/simulink, which can facilitate the prediction of the dynamic thermodynamic properties of other adsorbent pairs. According to the static and dynamic thermodynamic performance analysis of adsorptive working fluid pair, the suitable working temperature range and optimal cycle period of composite adsorbent working fluid are determined, and the adsorption bed of continuous adsorption refrigeration system is designed by using the adsorption equation fitted by experiment. Falling film evaporator and coil condenser. Finally, the continuous adsorption refrigeration system is simulated with the parameters of each component. It is found that when the inlet temperature of the evaporator is 15 鈩，
本文编号：2368379
[Abstract]:With the increase of global energy saving and environmental protection demand, adsorption refrigeration technology, which can utilize solar energy, industrial waste heat, waste heat and other low-grade energy, has become a research hotspot in industry and academia. The refrigerants in the physical adsorption working fluid pair mainly contain pure water and alcohols, the advantages of which are not flammable and explosive, no pollution to the environment, and can reduce the adverse effects on human living space. At the same time, the physical adsorptive working pairs rarely appear the phenomenon of adsorption performance decay with the increase of the number of adsorption cycles. The adsorption characteristics of adsorption refrigerant pairs have a great influence on the refrigeration performance of the system. However, due to the different types and production specifications of adsorptive refrigerant pairs, the adsorption properties and adsorption equations are different. It has great influence on the design and operation of adsorption refrigeration system. The physical adsorption properties of silica gel-water, activated carbon-ethanol, molecular sieve-water and a mixture of adsorbents were compared and analyzed in this paper. The dual-bed adsorption refrigeration system based on the working pairs of mixed adsorbents was studied. At first, a test rig was set up to test the adsorption properties of adsorbed working fluids. The effects of desorption temperature on the desorption capacity and desorption rate were compared and analyzed, and their respective adsorption equations were fitted out. The static cycle performance of adsorbent was tested by Matlab. The corresponding values of temperature and pressure were simulated, and the effects of adsorption end temperature, desorption end temperature, evaporation temperature and condensation temperature on the static thermal performance were simulated. The dynamic adsorption cycle model is built by using Matlab/simulink. The performance parameters of the system are simulated and compared with the static parameters to verify the feasibility of the dynamic model. At the same time, the optimum cycle period and driving heat source temperature of the adsorbent pair were found out. The general simulink program for the dynamic adsorption cycle of adsorbent pairs is constructed by using Matlab/simulink, which can facilitate the prediction of the dynamic thermodynamic properties of other adsorbent pairs. According to the static and dynamic thermodynamic performance analysis of adsorptive working fluid pair, the suitable working temperature range and optimal cycle period of composite adsorbent working fluid are determined, and the adsorption bed of continuous adsorption refrigeration system is designed by using the adsorption equation fitted by experiment. Falling film evaporator and coil condenser. Finally, the continuous adsorption refrigeration system is simulated with the parameters of each component. It is found that when the inlet temperature of the evaporator is 15 鈩，
本文编号：2368379
本文链接：https://www.wllwen.com/guanlilunwen/gongchengguanli/2368379.html
