Volume No. 2 Issue No.: 4B Page No.: 737-753 April-June 2008

 

PROS AND CONS OF ADOPTING CO2 AS A VIABLE, ALTERNATIVE, NATURAL REFRIGERANT

 

Maneesh Dubey*, SPS Rajput1, Satish Kumar Dubey2 and Anjali Tiwari3

1. Department of Mechanical Engineering, MANIT, Bhopal (India)
2. Department of Mechanical Engineering, BIST, Bhopal (India)
3. Department of Chemistry, LNCT, Bhopal (India)

 

Received on : October 21, 2007

 

ABSTRACT

 

Depletion of stratospheric ozone and climate changes by sustained release of chemicals containing chlorine and bromine led to the enactment of the Montreal and Kyoto Protocols. The HFC’S, once thought to be acceptable permanent replacement fluids for refrigeration and air conditioning are now in the list of regulated substances with their production levels being capped and gradually being phased out. There is frenzied activity in the research establishments world-wide to introduce ecologically safe and natural refrigerants. Substantial quantities of refrigerants also find their way in the automobile air conditioning systems. The release of these refrigerants into the atmosphere is still highly unregulated and fraught with uncertainty. CO2 has successfully been introduced in automobile air conditioning systems to ameliorate this problem. Therefore CO2 has been rediscovered as a viable option. The objectives of this paper are to review critically recent developments and sate of art technology for adopting CO2 in various refrigeration, air conditioning and heat pump applications. The focus will be on fundamental issues, design issues, cycle modifications and promising application areas. This review aims to project CO2 as a possible option with some cost effective cycles.

 

Keywords : CO2(R-744), Refrigerants, Air conditioning, Vapour compression refrigeration, Heat pump

 

 

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