Effects of flash tank vapor injection on the heating performance of an inverter-driven heat pump for cold regions

Optimization-Based Control Concept with Feed-in and Demand Peak Shaving for a PV Battery Heat Pump Heat Storage System

“…The heat pump/heat storage device model uses the same look-up table structure as the battery. According to [28], inverter-driven heat pumps have a higher COP during partial load operation. Therefore, as a very simple model for presenting the new control scheme, a linear behavior with the rated COP at full load and a slightly higher COP at 20 % partial load as supporting points is assumed.…”

Recent advances in vapor compression cycle technologies

“…The subcooler cycle yields a lower heating performance than the flash tank cycle even though it allows for more stable and precise cycle control through the variation of the injected amount. Heo et al (2010) studied the heating performance of the flash tank cycle using R-410A. The COP and heating capacity of the flash tank cycle were enhanced by up to 10% and 25%, respectively, at the ambient temperature of -15°C as compared to those of the non-injection cycle.…”

Performance investigation of multi-stage saturation cycle with natural working fluids and low GWP working fluids

“…The optimum subcooler pressure ratio was proposed from 0.4 to 0.7 in view of the heating capacity, and from 0.7 to 0.8 in view of the COP. Heo et al (2010Heo et al ( , 2011 investigated the heating performance of the heat pump system with the rotary type compressor. Authors reported that the heating capacity and COP of the injection cycle were enhanced by 25% and 10%, respectively, at the ambient temperature of 15 C. Moreover, the authors discussed about the various options of vapor injection cycles including the flash tank cycle and IHX vapor injection cycle.…”