Sammendrag
Ejector is increasingly utilized for expansion recovery of low grade heat to produce additional cooling effect. The R744 heat pump with one-phase ejector applies pump which requires quite insignificant work input, instead of compressor. Experimental investigations of the optimum operating conditions were performed. Different operating conditions, including the inlet temperature and pressure of the ejector (high-side temperature and pressure) were examined respectively. Based on the experimental results over a wide range of temperatures and pressures, the influences of high-side temperature and pressure on the mass entrainment ratio, overall COP, actual COP and ejector efficiency were obtained. The best performance was attained with the temperature of around 75 ℃ and pressure of around 85 bar under certain ejector geometry and fixed evaporator of 51 bar and condensing pressure of 58 bar.
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