A capillary tube is widely used as an expansion device for small refrigeration cycles. Recently, immiscible oil is sometimes used in the refrigeration cycle to improve severe lubricating conditions and to prevent blockage of the capillary tube caused by the hydrolysis of ester oil. This paper discusses the influence of mixing of the immiscible oil with the refrigerant on the flow characteristic...

The motivation for this project is to develop a hydrocarbon-based (ER12) refrigerant that has a lower flammability limit in excess of 5% refrigerant in air. Optimisation of the hydrocarbon content in the mixture, favourable refrigeration properties, minimal toxicity and benign environmental impact form additional constraints. A variety of compounds were considered as potential flammability redu...

Introduction: The air-conditioning and refrigeration industry is well on its way towards the design and commercialization of systems using R134a as the preferred environmentally acceptable replacement for CFC-12 in many applications. The industry is now turning some of its attention to replacements for HCFC-22. The US Clean Air act and its subsequent amendment calls for phaseout of CFCs by the ...

• F-gas + IL mixture equilibrium and mass transport properties are reviewed. Influence of molecular structure in solubility selectivity is discussed. Design absorption, extractive distillation membrane separations analyzed. Extensive database containing 5000+ data provided. Interest recovering reclaiming refrigerant gases growing as a consequence increasing concern about the high global warming...

CFCs have been phased out, except for essential users, and HCFCs are to be eliminated by 2020, because of their ozone depletion potential. This generates a need for the investigation of zero ozone depletion potential (ODP) refrigerants or refrigerant blends. R410A is among newer brand of refrigerant blends, with zero ODP. The biggest difference to R22 is the pressure levels generated which are ...

Due to the dependence of boiling heat transfer rate on heat flux, saturation pressure, mass flux and refrigerant quality, efforts made to increase heat transfer rate often cause further drop in refrigerant saturation pressure. In this study, entropy generation mechanisms associated with two-phase flow in smooth evaporator tube subject to constant surface heat flux are investigated. Refrigerant ...

The Cryogenic Carbon CaptureTM (CCC) process is a retrofit, post-combustion technology that desublimates CO2 in the flue gas and produces a separate liquid CO2 product. This project focuses on the energy-storing version of this process, CCC ESTM. During off-peak hours, CCC ESTM generates more refrigerant than is needed for the process, which is stored in an insulated vessel as a liquid at the l...