Abstract Environmental concerns have created need to find replacements for HFC and in some cases HCFC refrigerants used screw compressor applications. Like most refrigerant changes it becomes necessary assess the best lubricant option order maintain system reliability performance. Regardless of magnitude allows opportunity appraise alternative chemistries that are different from what was past. ...

In the present work, various objective functions were formulated and optimized using mixed integer nonlinear programming generalized reduced gradient method from solver tool of Microsoft® Excel 2016, respectively. The CH3FO2, C2H4F2O, CH2F2O2, CH2F2O, C3H4F2, C2H2F2O molecules found to meet structural feasibility constraints physical properties refrigerant have not previously been reported in l...

To cope with the climate issue, China has clearly stated goal of carbon peaking and neutrality. Most refrigerants currently used are HCFCs HFCs refrigerants. These have high COP GWP values can cause a severe impact on environment. Ammonia refrigerant is an environmentally friendly natural refrigerant, ODP value zero, cost low, significant environmental operational advantages, large unit cooling...

The paper deals with the topic of refrigerants, their historical evolution, applied legislation and trends in maritime affairs. Regarding Environmental care considers impact refrigerants refrigeration systems, both on stationary plants land board. New regulations European Union, IMO organization, require reduction complete abolition harmful synthetic introduction new that will have a significan...

In the present paper the pressure drop characteristics of a 1.4 mm hydraulic diameter multiport minichannel tube during adiabatic two-phase flow of HFC refrigerants are discussed. The tube consists of eleven parallel rectangular cross section channels. Although much experimental research has been devoted to investigate the pressure drop characteristics of R134a inside multiport minichannels in ...

Title of Dissertation: STUDY OF CONDENSATION OF REFRIGERANTS IN MICRO-CHANNELS FOR DEVELOPMENT OF FUTURE COMPACT MICRO-CHANNEL CONDENSERS Sourav Chowdhury, Doctor of Philosophy, 2008 Directed By: Professor Michael Ohadi, Department of Mechanical Engineering Miniand microchannel technology has gained considerable ground in the recent years in industry and is favored due to its several advantages...

This paper investigates the results of a Second Law analysis applied to a mobile air conditioning system (MACs) integrated with an internal heat exchanger (IHX) by considering R152a, R1234yf and R1234ze as low global warming potential (GWP) refrigerants and establishing R134a as baseline. System simulation is performed considering the maximum value of entropy generated in the IHX. The maximum e...