Efficiency analysis of alternative refrigerants for ejector cooling cycles

Ejector refrigeration: A comprehensive review

“…Tests over different working fluids (acetone, benzene, cyclopentane, cyclohexane, toluene, R236ea, R236fa, R245ca, R245fa, R365mfc and RC318) for high temperature heat source (T g ¼70-200°C, T e ¼10°C, T c ¼40°C.) show that no one is able to cover all the operating range, and each working fluid has its own maximum ω and COP at a certain optimum T g [237]. However, working fluids with limited environmental impact and good performance are needed and using hydrocarbon refrigerants can be a viable technical and environmental option when ensuring requisite care surrounding their flammability is taken, e.g., by developing safety procedures to use them [11].…”

“…The highest COP, equal to 0.32 was achieved for R600a at the temperature of 102°C and a COP equal to 0.28 for R601 at 165°C. The same authors [237] compared refrigerants (organic and nonflammable) for a high temperature heat source (acetone, benzene, cyclopentane, cyclohexane, toluene, R236ea, R236fa, R245ca, R245fa, R365mfc and RC318): no single refrigerant could ensure high performance across the entire operating range. Among the non-flammable refrigerants, R236fa was the most beneficial, providing a maximum COP equal to 0.23.…”

“…Accordingly, R600 appears to be a viable option for ejector refrigeration systems considering system performance and environmental aspects; flammability has not yet been addressed. Gil and Kaspergi [237] tested different working fluids (acetone, benzene, cyclopentane, cyclohexane, toluene, R236ea, R236fa, R245ca, R245fa, R365mfc and RC318) for high temperature heat sources (T g ¼70-200°C, T e ¼10°C, T c ¼ 40°C.). They found no one working fluid could accommodate the entire operating range, and each working fluid had its own maximum ω and COP at a certain optimal T g .…”

A Novel Heat Recovery System for High Temperature and High Humidity Gas

“…The admission port of ejector links up with the header, so that the inlet pressure is the evaporating pressure of heated water flowing into the DHEX. As long as the inlet pressure is lower than the evaporating pressure and the condensing temperature of flue gas is higher than the vaporization temperature of heated water, the latent heat of condensation transfers to the heated water to make the water evaporate [5]. In ejector, evaporated water vapor mixes with the high pressure and temperature ejector flow, and becomes vapor steam at medium temperature and pressure.…”

Performance analysis and working fluid selection for ejector refrigeration cycle

“…The effects of various operating parameters on the cycle performance are also evaluated and discussed for all candidates. Figure 1 displays a schematic diagram of an ERC and its presentation in the pressure-enthalpy (p-h) diagram [14]. The cycle consists of a generator, a circulation pump, a condenser, an evaporator, an ejector and an expansion device.…”