太阳能无泵溴化锂制冷机性能优化分析

为了改善吸收器的吸收性能和提高系统的整体运行性能，在搭建小型太阳能无泵溴化锂吸收式制冷系统的基础上，采用温控装置控制太阳能模拟集热器的温度（80～93℃）与实际集热器的工作温度范围相一致，增加弦月形热虹吸管的数量，将二次发生装置引入气液分离器，吸收器和蒸发器封装同体并左右布置，采用蛇形叉排式横管降膜吸收和蒸发，并增设布液器和溢流式喷淋装置。结构优化后系统启动温度平均降低5℃，提高了太阳能的利用率；溶液可在较低的初始质量分数（46％～53％）下被提升，扩大了放气范围；吸收器降膜表面持液率增大，浓溶液进口浓度平均提高4％，吸收率也相应增大为原来的3．575倍。通过变工况试验，得到吸收性能与各种影响因素之间的应变规律，为研制高效吸收器和推进系统小型化提供依据。

Optimum analysis on performance of solar pump-free lithium bromide absorption air-conditioning

Based on the compact solar pump-free lithium bromide absorption air-conditioning, carries out the optimization of system design. In order to enhance the operation performance of the absorber and the whole system, increases the number of the lunate thermo-siphon elevation, introduces a second generator into the gas liquid separator, installs evaporator and absorber in the same chest and in which a kind of staggered coiled film-falling pipe and overflow sprayer is proposed. After configuration optimization, the minimum starting temperature is decreased by 5 ℃ on average so that the solar energy utility efficiency is improved; the deflation range is enlarged with the lower initial concentration ranging from 46 % to 53 %. By increasing the liquid holding efficiency and the inlet concentration in the film-falling absorber, absorptivity is 3. 575 times higher than that before. At changeable experimenting conditions, the absorber efficiency related to influencing factors is gained, which would be valuable for the development of the absorber, even for that of the whole system.