Applying Evaporative Condensers to Subcritical CO2 Condensin
Applying Evaporative Condensers to Subcritical CO2 Condensing and Transcritical CO2 Gas Cooling (2015)-A mathematical model of an evaporative condenser that allows for unusual properties of CO2 has been constructed to show that subcritical CO2 can be condensed at 30°C (86°F) with ambient air at 35°C (95°F) dry bulb and 24°C (75°F) wet bulb. World-wide climate conditions are examined to show that evaporative condensers can be used to condense subcritical CO2 at 30°C (86°F) for the entire or most of the year in large areas of many countries such as USA, China, Canada, Australia almost all of Europe including Spain, Italy, Greece, and Turkey. Reduction in water consumption is demonstrated using a dry cooler in conjunction with an evaporative condenser. It is also demonstrated that evaporative CO2 gas cooling of transcritical fluid results in high electrical energy efficiency signified by high Coefficients Of Performance (COP) at supercritical pressures of 7.5 MPa (1088 psia) and higher, particularly when employing parallel compression for medium temperature and low temperature refrigeration duties in, for example, supermarkets by providing AC cooling as part of the parallel compressor operation at 5 to 10°C (41-50°F) CO2 evaporating temperatures.
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