Abstract
It is suggested that a steam injector (SI) is applied to heat pump systems to downscale them. Because SI has high heat transfer performance due to the direct contact condensation, and the feature to act as a static jet pump without any rotating power. Thus the objective of the present study is to investigate the heat transfer flow characteristics of an ultra micro steam injector (UMSI) whose throat diameter is 600 μm by the flow observation. As the results, the formation of water jet and the back stream in the mixing nozzle which are the operating characteristics of SI is confirmed.
