This research studies the influence of using SiO2 nano-particles 50nm in a Vapor Compression Refrigeration System (VCRS), along with Poly-alkylene Glycol (PAG) oil and R-134a mixed to create nano-refrigerant. The methodology used this work, were performed three different concentrations (0.1%, 0.3%, 0.5%) 200ml PAG oil. A VCR system was built at mechanical engineering department laboratory Al-Qa...

Trifluoroacetic acid (TFA), a highly soluble and stable organic acid, is photochemically produced by certain anthropogenically emitted halocarbons such as HFC-134a HFO-1234yf. Both these haloca...

1,1,1,2-tetrafluoroethane (HFC-134a) is a potent greenhouse gas that can be degraded to produce trifluoroacetic acid (TFA), degradation product has an impact on aquatic ecology, so its emission been continuous concern worldwide. Existing studies mainly estimate the global- or national-scale emissions of HFC-134a, and there are relatively few regional emissions, all which used top-down method. B...

The pressure drop of refrigerant R-134a flow boiling inside a horizontal tube has been investigated experimentally. The test set-up which was used in this investigation is a well instrumented vapor compression refrigeration system. These instruments are thermocouples, flow meter, pressure gauges and the pressure drop measuring apparatus. This system consisted of three electrically heated evapor...

HFC-134a is used as working fluid in refrigerators widely. However, how to improve the efficiency of compressor and refrigerator is major topic in the word. The purpose of this study is aimed at the performance evaluation of compressors with different viscosity of POEs oil. A hermetic reciprocating compressor using HFC-134a as refrigerant was adopted and the experimental investigation was carri...

Over the last thirty years, few changes have taken place in reciprocating refrigeration and freezer hermetic· compressors. Of course there have been design improvements and many new applications, but the basics have stayed the same. DOE requirements have brought new energy standards for 1993 and, with most of that work behind them, manufacturers of white goods are concentrating on alternate ref...

Gas mixtures have been studied in order to be used in the Resistive Plate Chambers (RPCs) of the OPERA spectrometers. We are interested in mixtures with a low R-134a concentration in order to reduce the streamer charge and the operating voltage without spoiling the usual RPC performances. r 2007 Elsevier B.V. All rights reserved.

[1] The CalNex 2010 (California Research at the Nexus of Air Quality and Climate Change) study was designed to evaluate the chemical composition of air masses over key source regions in California. During May to June 2010, air samples were collected on board a National Oceanic and Atmospheric Administration (NOAA) WP-3D aircraft over the South Coast Air Basin of California (SoCAB) and the Centr...