Abstract
It is suggested that a steam injector (SI) is adjusted to heat pump systems to downscale the outdoor unit for the diffusion of them. The SI has high heat transfer performance due to the direct contact condensation and acts as a static jet pump. It is expected that the downsizing of the SI enable us to downsize a condenser and a compactor. And the feature to drive without any rotating power source may enable to reduce the total system energy. The objective of the present study is to investigate the operating condition of an ultra micro steam injector (UMSI) whose throat diameter is 600μm from the flow observation and the measurement of condensate. As the results, the backflow was confirmed due to the condensation in the mixing nozzle and the check valve in the drain. And heat transfer quantity of this device is approximately 500W.
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