基于低品位热源的两相热压缩机初步实验

Preliminary experimental study on a two-phase thermocompressor driven by low-grade heat sourses

两相热压缩机利用热源驱动,通过活塞的往复运动,使两相工质在热腔和冷腔中来回穿梭,伴随气液相变形成压力波动.它采用低沸点工质,具有驱动温差小、压比大等突出优点,可以利用低品位热源,如废热、太阳能等.自行设计研制了基于低品位热源的两相热压缩机,初步研究了以正己烷为工质的热压缩机系统性能.该压缩机在0.1,0.2和0.3Hz频率下运行时,压比均保持在5以上,且加热功率小于120W.这对有效地利用低品位热源实现热功转化有着重要意义.

The two-phase heat-driven thermocompressor employs a displacer to shuttle the working fluid between the hot end and the cold end of the cylinder,where pressure fluctuates due to gas-liquid phase change.The thermocompressor using refrigerants with low boiling point,can generate large pressure ratio with small temperature difference.The first two-phase thermocompressor was designed and fabricated in China.Preliminary experiments have been conducted on a self-made two-phase thermocompressor using n-hexane as working fluid.Pressure ratios as high as 5 even higher is obtained with operating frequency of 0.1,0.2 and 0.3 Hz,and heating power less than 120 W.The two-phase thermocompressor may be an efficient alternative in energy conversion of low-grade heat sources,such as waste heat,solar energy and so on.