【摘要】 研究了超声强化传质方法对吸收式制冷系统工质溴化锂溶液中冷剂水的沸腾传质过程的影响.结果发现:超声波对该冷剂水的传质过程有明显的强化作用,初始阶段强化效果最好,随着系统达到平衡强化效果逐渐减弱并趋于稳定;对于以50%溴化锂溶液为工质、初始压强约800Pa的制冷系统,加热热源温度在65℃～80℃时,超声波对冷剂水传质过程的强化率大于20%,且热源温度越低强化效果越显著;使用超声强化传质的方法可以有效地提高低温热源驱动下的溴化锂吸收式制冷机的制冷效率,降低制冷系统所需最低驱动热源温度,且不会影响系统的稳定运行.该方法适用于低温热水驱动的太阳能吸收式制冷系统,能增强太阳能空调的制冷性能.更多还原

【Abstract】 In this paper,the effects of ultrasonic waves on the mass transfer of the cryogen water in LiBr solution that acts as the working medium in an absorption refrigeration system were investigated.The results indicate that(1) ultrasonic waves obviously enhance the mass transfer of the cryogen water;(2) the enhancement is strongest at the intial phase,and then it gradually weakens and tends to be stable as the system becomes balanced;(3) in the refrigeration system with 50% LiBr solution as the working medium and with an initial pressure of 800 Pa,the transferring intensification rate is more than 20% when the heat source temperature is kept at 65 ～ 80 ℃,and it increases significantly with the decrease of the heat resource temperature;(4) the method of applying ultrasonic waves to the mass transfer enhancement can effectively improve the refrigeneration efficiency of the LiBr absorption refrigerator driven by low-temperature heat resources and can reduce the lowest temperature of heat source water for the refrigeration system without affecting the stable operation of the system;and(5) the propsed method is suitable for the solar absorption refrigeration system driven by low-temperature hot water and is capable of improving the refrigeration performance of solar air-conditioning.更多还原