Performance assessment of ejector-expansion vapor compression refrigeration system with eco-friendly R134a alternative refrigerants (R152a, R1234yf, R600a, R600, R290, R161, R32, and propylene) is presented for air-conditioning application. Ejector has been modeled by considering experimental data based correlations of component efficiencies to take care of all irreversibilities. Ejector area ratio has been optimized based on maximum coefficient of performance (COP) for typical air-conditioner operating temperatures. Selected refrigerants have been compared based on area ratio, pressure lift ratio, entrainment ratio, COP, COP improvement and volumetric cooling capacity. Effects of normal boiling point and critical point on the performances have been studied as well. Using ejector as an expansion device, maximum improvement in COP is noted in R1234yf (10.1%), which reduces the COP deviation with R134a (4.5% less in basic cycle and 2.5% less in ejector cycle). Hence, R1234yf seems to be best alternative for ejector expansion system due to its mild flammability and comparable volumetric capacity and cooling COP. refrigerant R161 is superior to R134a in terms of both COP and volumetric cooling capacity, although may be restricted for low capacity application due to its flammability.
Keywords
A field experiment was directed during the rabi period of 2020-21 in the sandy topsoil of A.N.D. University of Agriculture and Technology, Kumarganj, Ayodhya (U.P.). The investigation was directed in Split Plot Design (S.P.D.), comprising of three growing environments/ambient temperature viz. 31st October (22.6°C), 10th November(21.2°C), 20th November(19.4°C) and three cultivars i.e. NDR-8501 (V1), Kranti (V2) and Varuna (V3). The experiment was replicated four times. Results revealed that the highest thermal unit (1667.2 days) and thermal use efficiency (0.61 g/m²/ºdays) was recorded at developing climate/encompassing temperature of 31st October (T1) (22.6°C)while least gathered hotness units from planting to development (1468.9ºC days) was seen under the developing climate/surrounding temperature of twentieth November. The late-planted mustard crop recorded the least GDD prerequisite at every one of the stages. The least Thermal use proficiency from planting to development 0.435g/m²/ºdays was seen under developing climate/encompassing temperature (tenth November)(21.2°C). Late planted cultivars recorded the least warm use effectiveness necessity at all stages.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.