“直接替代”一词已经迁移到现在的R22阶段。目前,已有超过20种基于HFC的R22系统改造用制冷剂。然而,HFC不与矿物油混溶,而是通常需要使用合成润滑剂,如PAG、POE(多元醇酯)或PVE(聚乙烯醚)润滑剂。此外,R22系统改造用制冷剂型都是混合制冷剂,其在所有情况下的表现都不会与R22这样的单组分制冷剂相同。 一些制冷剂...
The experimental results showed that the natural refrigerants presented the best coefficient of performance, COP, and the results for HFCs, excepting the R32, remained below those of R22. In relation to the environmental impact, using TEWI, the hydrocarbons presented best results; meanwhile the HFC...
The values of pressure drop obtained from the simulations for refrigerants, R22, R134a and R407C are compared with correlations and experimental data available in literature.P. BhramaraK. V. SharmaT. K. K. ReddyAsian Research Publishing Network (ARPN)Journal of Engineering & Applied Sciences...
Several refrigerants have emerged as substitutes to replace R22, the most widely used fluorocarbon refrigerants in the world. These include the environment... V Jain,SS Kachhwaha,RS Mishra - 《International Journal of Energy & Environment》 被引量: 17发表: 2011年 Exergy analysis of a Vapour ...
Experimental measurement of vapor-liquid equilibrium for 3,3,3-trifluoropropene(R1243zf)+1,1,1,2-tetrafluoroethane(R134a) at temperatures from 243.150 to 2... New regulations have been approved that only low-GWP refrigerants will be used in developed countries. As mixed refrigerants especially ...
The thermodynamic analysis of direct expansion solar-assisted heat pump system working with R290 as a drop-in substitute for R22 was carried out under the metrological conditions of Calicut, India. A prototype of a DXSAHP system consists of a compressor, an air-cooled condenser with evaporator–...
Working under high reduced pressure conditions, CO2 and some novel substitute refrigerants, such as R404a and R410a, are known as the “high-pressure” fluids. One significant feature of these refrigerants is that their vapour densities are higher than those of the conventional refrigerants, such ...
estimated the two-phase multiplier using their experimental data for condensation of four different refrigerants in multiport mini-channels, and obtained a reasonable accuracy with AARE of 9.6%. Various FPD models have also been proposed based on extensive sets of experimental data. However, most ...
Water cooling unit drop in cool room units condensing unit refrigeration Product Features This condensing unit uses advanced European technology, making it perfect for cold storage, food processing, cold chain logistics, etc. It features eco-friendly refrigerants, excell...
Boiling heat transfer mechanism of environmental-friendly refrigerants: A review Hongyu Lv, ... Tianbiao He, in International Journal of Refrigeration, 2022 3 Influencing factors of pressure drop The pressure drop is one of the significant characteristic parameters in the research of boiling heat trans...