新型膜蒸馏传质回热的吸收式制冷循环

A new absorption chilling cycle with solution heat exchange by membrane distillation mass transfer

提出了传质回热吸收式制冷循环,该循环在溶液回热过程中引入膜蒸馏技术,将传统吸收式制冷循环中的溶液等浓度回热过程转变为溶液变浓度回热过程。同传统吸收式制冷循环相比,该循环的发生过程向低温区移动,这对于低品位热能的利用以及提高吸收式制冷装置的热效率具有重要意义。传质回热器采用直接接触式膜蒸馏传质传热技术是可行的,传质回热吸收式制冷的理论循环与理想循环的偏差是由膜蒸馏传质回热器膜两侧溶液的蒸汽压差和膜导热引起的。

A new absorption chilling cycle is presented.On this absorption chilling cycle,the solution heat exchange base on membrane distillation mass transfer principle instead of that in general absorption chilling cycle,it is called membrane distillation heat exchanger,so the heat exchange process with non-constant concentration,and the generating temperature of steam is reduced which is important to use low qualified heat energy and improve COP of absorption chiller.The ideal cycle and the theoretical cycle are discussed, whose difference depends on the thermal conductivity of membrane and difference of the vapor pressure between the hot and cold solution.