弦月形通道在太阳能空调系统中的强化传热研究

Study on enhanced heat transfer of lunate channel in solar energy air-conditioning system

研究表明 ,弦月形通道的特殊结构可以有效促进Li-Br溶液的沸腾 ,降低溶液过热度 ,强化传热、传质过程 ,相同工况下的换热量是环形通道的 2～ 3倍 ,使太阳能小型溴化锂吸收式空调系统在 70～ 80℃加热水温度下就可以正常运行。弦月形通道偏心特性尺寸S对通道内Li-Br溶液的流动与换热影响很大 ,实验结果表明 :di=19mm和d0 =32mm的铜管构成的弦月形通道的提升效果较好。

Researches indicate that the special structure for lunate channel can efficiently accelerate boil of Li-Br solution, decrease the superheat of solution, and enhance heat and mass transfer. The quantity of heat transfer is about 2～3 times higher with lunate channel than with round channel under the same conditions. This made it possible that miniature Li-Br absorbing air-conditioning system operates normally with the heating water of 70～80℃. The misalignment characteristics of the lunate channel greatly affect the flowing and heat transfer of Li-Br solution. The experimental results show that the lunate channel with d i=19mm, d 0=32mm has the better upgrading effects.