Experimental research on enhanced vapor injection system of household air-cooled heat pump unit

Based on the household air-cooled heat pump unit, studies the operating characteristics of two-step throttle and enhanced vapor injection system in different environmental conditions by experiment, and further studies the law of coupling control by two-step throttle. The results show that the heating capacity of the enhanced vapor injection system increases by 18% to 20% and the energy efficiency improves by 7%, compared to the conventional compression system. Obtains the preliminary conclusion of the control law of two-step throttle, which provids references for product development.