نتایج جستجو برای: 134a

تعداد نتایج: 387  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
Mark F Lunt Matthew Rigby Anita L Ganesan Alistair J Manning Ronald G Prinn Simon O'Doherty Jens Mühle Christina M Harth Peter K Salameh Tim Arnold Ray F Weiss Takuya Saito Yoko Yokouchi Paul B Krummel L Paul Steele Paul J Fraser Shanlan Li Sunyoung Park Stefan Reimann Martin K Vollmer Chris Lunder Ove Hermansen Norbert Schmidbauer Michela Maione Jgor Arduini Dickon Young Peter G Simmonds

We infer global and regional emissions of five of the most abundant hydrofluorocarbons (HFCs) using atmospheric measurements from the Advanced Global Atmospheric Gases Experiment and the National Institute for Environmental Studies, Japan, networks. We find that the total CO2-equivalent emissions of the five HFCs from countries that are required to provide detailed, annual reports to the United...

2009
Thomas J. Leck

In response to concerns about the contribution of fluorocarbon refrigerants to global climate change, a new, more environmentally sustainable, refrigerant molecule has been developed and is being evaluated. This new molecule is the hydrofluoroolefin 2,3,3,3,-tetrafluoroprop-1-ene, or HFO-1234yf. The molecule has been shown to be stable inside refrigeration equipment, but to quickly decompose if...

2014
Tarang Agarwal Manoj Kumar Praveen Kumar Gautam

This paper presents a cost-effective method to increase the COP and utility of a domestic refrigerator using R-134a refrigerant. A cabin was installed on the top of a domestic refrigerator with condenser coils of refrigerator serving as heating coils inside the cabin. Known quantity of water was heated by the condenser coils (due to convection currents) thereby increasing the overall COP of the...

2016
María J. Balart Jayesh B. Patel Zhongyun Fan

This paper reports the current status of Mg melt protection in view to identify near-future challenges, but also opportunities, for Mg melt protection of Mg-Al based alloys. The goal is to design and manufacture sustainable Mg alloys for resource efficiency, recycling and minimising waste. Among alternative cover gas technologies for Mg melt protection other than SF6: commercially available tec...

2014
I. R. Shankland R. S. Basu D. P. Wilson

THE~$L CONDUCTIVITY AND VISCOSITY OP A NEW STRATOSPHERICALLY SAFE REPRIGERANT1,1,1,2-TETRAPLUOROETHANE (R-l34A) I. R. Shankland R. s. Basu D. P. Wilson GenetronR Products Laboratory Allied-Signal, Inc. 20 Peabody st. Buffalo, NY 14210 Recent hypothesis on stratospheric ozone deple tion by chlorofluorocarbons has prompted industry to lo ok for environmentally safe alternates to refrigerants such...

2013
G. Naga Malleshwar Rao

Centrifugal compressors are most widely used in large capacity refrigeration and air conditioning plants. Its other applications include in gas turbines for air craft applications, diesel engine turbochargers, chemical and process industries, factory workshop air supplies etc. In refrigeration field these are suitable for high specific volume refrigerants or low pressure stages. They have been ...

Journal: :International journal of computational and experimental science and engineering 2023

There are a limited number of studies in the literature that include detailed exergy analysis vehicle air conditioning systems. In this study, order to increase performance system vehicles, has been made with assumption different refrigerants used. R-134A, R-E245cb2, R-404A, R-1234ze(Z), R-161, R-1234zd(E), R-513A, R-1234ze(E) and R-1234yf chosen as refrigerant. analysis, comparison by consider...

2014
A. Cavallini L. Doretti L. Rossetto G. A. Longo

Heat transfer condensation tests inside a 8 mm ID tube for R-134a, R-410A and R-125 are reported at an average saturation temperature of 40°C, at mass velocities ranging from 65 to 750 kg/(m s), over the entire vapour quality range. After comparing the experimental data against a model able to predict both shear force and gravity driven condensation, a comparison among these fluids has been car...

2015
Deepak Paliwal

An experimental performance study on VCR system with 100g R600a/R290 refrigerant mixture and 100g R600a (pure isobutene) as drop in replacement of R134a was conducted . continuation running tests were performed under different length of capillary for R600a/R290 & R600a. The result showed that the hydrocarbon mixture (R600a/R290) had highest COP at L=10 feet length capillary by17.35% -23.5% for ...

2012
J. Thavamani Mohan Lal

An experimental performance comparison study on domestic refrigerator system was conducted and compared with HFC134a and M09 (HFC134a and HC blend (containing 55.2%HC600a and 44.8%HC290 by weight)) mixture refrigerant. The domestic refrigerator system was initially designed to operate with HFC134a.Experimental results showed that the refrigeration capacity of the refrigerant M09 mixture system ...

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