Performance improvement of air source heat pump using gas-injected rotary compressor through port on blade

•The system performance of AHSP with blade-injected rotary compressor is investigated.•ASHP with the blade injection can enhance the heating capacity and COP by 23.1-28.2% and 4.5-8.1%, respectively.•The blade injection structure can enhance the mass flowrate in the condenser by 26.1-29.2%.

Gas injection has been a crucial technology to avoid the serious degradation of air source heat pumps in low ambient temperature. A novel injection structure on the blade for rotary compressors has been put forward in previous research to overcome the drawback of traditional injection structures. Based on a verified numerical model, the thermodynamic performance of an air source heat pump with the new gas-injected rotary compressor is investigated. The results indicate that, compared to the air source heat pump with the regular single-stage rotary compressor, the proposed injection structure can enhance heating capacity and COP of the air source heat pump by 23.1-28.2% and 4.5-8.1%, respectively.