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CHAPTER 6. SAFETY CONCERNS Safety is a major concern in refrigeration application and is one of the main reasons why synthetic refrigerants were introduced and are being exploited. The threat from the phenomenon of global warming has propelled researchers to concentrate again on natural refrigerants. Apart from its other unique properties, CO2 is the only non-flammable and non-toxic refrigerant amongst the other natural refrigerants. ASHRAE’s safety group classification illustrated in Figure 6-1 is classified by two categories. The letters determine the increasing toxicity and the numbers denote the increasing flammability. Figure 6-1. Refrigerant safety group classification (Environmental Protection Agency, 2011). CO2 is classified under the A1 category as most other hydrocarbons. Carbon dioxide is non-toxic, but it can be a cause of concern at higher concentrations. Carbon dioxide replaces air and causes lack of oxygen. There have been a couple of studies on the safety of carbon dioxide based air conditioning. Amin et 47PDF Image | CO2 HEAT PUMPS FOR COMMERCIAL BUILDING APPLICATIONS
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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