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A review of available information shows that R30 (also known as methylene chloride or dichloromethane, CH2Cl2) has desirable properties as a non-flammable natural refrigerant suitable for use in low-pressure centrifugal chillers. R30 is already used as a non-ozone-depleting substitute for CFCs and HCFCs for many applications, including solvents and foam blowing. Studies show that it is a naturally occurring substance with sources that include oceans, biomass burning, and mangrove swamps. Global environmental properties are favourable with a 100-year GWP of 9 compared to carbon dioxide and an atmospheric life of 0.4 years. Historically, R30 was successfully used in centrifugal chillers and in home refrigerators before the introduction of CFCs. Current handling requirements are similar to those for R123. A thermodynamic analysis indicates that R30 has high cycle efficiency at typical water-cooled chiller conditions. These advantages may allow R30 to compete successfully with synthetic refrigerants in centrifugal chillers.
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Continuous detection of VOC gas in explosion hazardous area with flame proof structure Self diagnosis function with built-in Microprocessor Easy replacement with a cartridge type sensor Digital flow sensor to maintain regular flow rate Fast response of gas leakage with a high efficient pump inside Low concentration VOC gas detection by PID sensor Stable quality…
Continuous detection of flammable, CO2, CO and N2O gases in explosion hazardous area with flame proof structure State-of-the art infrared detection principle Long service life time (more than 5 years) Operation in non oxygen environment Self diagnosis function with built-in Microprocessor Fast response time(<5 sec) Built-in back light LCD or OLED display Auto calibration and…
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