Advanced high temperature heat pump configurations using low GWP refrigerants for industrial waste heat recovery: A comprehensive study

Life cycle energy, emissions and cost evaluation of CO2 air source heat pump system to replace traditional heating methods for residential heating in China: System configurations

Solar ejector cooling systems: A review

Life cycle techno-enviro-economic assessment of dual-temperature evaporation transcritical CO2 high-temperature heat pump systems for industrial waste heat recovery

Thermoeconomic analysis of CO2 Ejector-Expansion Refrigeration Cycle (EERC) for low-temperature refrigeration in warm climates

Progress in ejector-expansion vapor compression refrigeration and heat pump systems

The transcritical CO2 two-phase flow in the ejector was investigated numerically by the computational fluid dynamics (CFD) method. The accuracy of the built three-dimensional CFD model was validated by contrasting the simulating results with the available experimental data in the literature. The distribution of pressure, velocity and two-phase volume fraction inside the ejector was analyzed. The effect of the primary nozzle diverging angle on the performance of the ejector was obtained. The results showed that the pressure of the CO2 is decreased and the velocity is increased after the stream enters the primary nozzle. The velocity at the exit of the primary nozzle reaches a maximum value, which is about 168 m/s. The two streams are then mixed in the mixing chamber; the velocity and the pressure were found to be shocked initially and then tend to be stable. The velocity decreases and the pressure increases gradually in the diffuser section. The vaporization of the transcritical CO2 was found to be occurred near the throat of the primary nozzle. The optimum diffusion angle of the primary nozzle was found to be about 6°, where the mass entrainment ratio is 0.83.

Numerical Study on Two-Phase Flow of Transcritical CO2 in Ejector

A novel green waterless and oilless chemical mechanical polishing for soft-brittle, temperature-sensitive and deliquescent potassium dihydrogen phosphate

Jianjun Yang

Papers

Progress in ejector-expansion vapor compression refrigeration and heat pump systems

Numerical Study on Two-Phase Flow of Transcritical CO2 in Ejector

A novel green waterless and oilless chemical mechanical polishing for soft-brittle, temperature-sensitive and deliquescent potassium dihydrogen phosphate