Applying mechanical subcooling to ejector refrigeration cycle for improving the coefficient of performance

Thermodynamic analyses on an ejector enhanced CO2 transcritical heat pump cycle with vapor-injection

“…In the mixing section, when the energy dissipation in the mixing process is neglected, the momentum conservation equation and the ideal mixing velocity can be expressed as, 9 9 14 14 9 14 10 In this paper, the energy dissipation at the mixing process in mixing chamber is taken into consideration, and the mixing efficiency m η [41] is introduced to calculate the mixing velocity. Applying the energy conversation at the diffuser section of the ejector, the specific enthalpy of the mixed flow leaving the diffuser can be expressed as, 2 11 10 10…”

Ejector refrigeration: A comprehensive review

“…The cycle increases the COP by 9.3-17.8% compared to a conventional cycle. The same research group proposed some other solutions [175]: a mechanical sub-cooling ejector refrigeration cycle with R142b improved the COP up to 10% compared with a conventional cycle. However, despite the increase of performance, difficulties exist in the system control [11].…”

Performance evaluation of an ejector subcooled vapor-compression refrigeration cycle

“…The isentropic efficiency of a liquid pump is usually in the range of 0.6-0.85 according to some literatures [32,33], and thus the median value of 0.75 is assumed in this study. The ejector is assumed to have the following efficiencies: g n = 0.85, g d = 0.85 and g m = 0.95 [34][35][36]. It should be noted that in the following simulations the cycle performance are evaluated on per unit of mass flow rate at the compressor inlet, i.e.…”