Two-stage direct expansion solar-assisted heat pump for high temperature applications

A comprehensive review on advances and applications of industrial heat pumps based on the practices in China

“…For example, the vapor compression cycles can be advanced to two-stage or multistage systems, and an economizer, an intercooler, and an ejector can be added to the cycles to improve energy efficiency [55][56][57][58]. The absorption cycles can also have two-stage systems and single or double-effect systems [59,60].…”

Mathematical Modelling and Experimental Validation of Solar Assisted Heat Pump System

“…Chaturvedi et al [10] performed studies on thermodynamic analysis of two-phase flow in solar collectors with application to a direct-expansion SAHP. Studies showed that changes in the mass-flow rate and absorbed solar heat flux have significant effects on the collector tube length and refrigerant heat transfer coefficient.…”

Investigation of the performance of a high-temperature heat pump using parallel cycles with serial heating on the water side

“…The tests showed that the condenser outlet water temperature could reach about 90 C with a high coefficient of performance (COP). Chaturvedi et al (2009) theoretically investigated a solar-assisted heat pump for high-temperature applications with R134a. Brown et al (2009) considered and estimated R1234ze(Z) as a possible high-temperature refrigerant in his study.…”