retrofitting with non-cfc substitutes

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RETROFITTING WITH NON-CFC SUBSTITUTES Conclusion Increasing compressor displacement by an appropriate amount can decrease energy consumption. In order to lower energy consumption while using HFC-134a as a refrigerant, changes must be made to the compressor, condenser, evaporator, capillary tube, etc. Therefore, further study of component matching is necessary. 12
RETROFITTING WITH NON-CFC SUBSTITUTES HFC-152a retrofit for CFC-12 1993 UNEP IE: Catalogue of Technologies for Protecting the Ozone Layer, Refrigeration, Air Conditioning and Heat Pumps. Norway, 1993. Has shown the best result <strong>with</strong> regard to energy consumption. Problems Flammability: The safety risk is quite small in domestic refrigerators because the units have charges of only a few hundred grams. Has approximately 5% less volumetric refrigerating capacity than CFC-12. Typical modifications needed are: change of lubricant adjustment or change of expansion device change of desiccant filter Comparison of replacement refrigerants HFC-134a and HFC-152a 1993 Vineyard, Edward; Swatkowski, Leonard. 1993: Energy efficiency of HFC-134a versus HFC-152a. Paper presented at the 1993 International CFC and Halon Alternatives Conference, 20-22 October 1993, Washington, D.C., U.S.A. pp. 86-91 In an effort to evaluate the trade off between efficiency and safety of the two alternative refrigerants HFC-152a (flammable) and HFC-134a (<strong>non</strong> flammable), energy consumption tests were performed by 6 refrigerator/freezer manufacturers as part of a joint project. Conclusion Results showed no statistically significant difference between the efficiencies of HFC-134a and HFC-152a. Thus, HFC-134a is a more acceptable substitute for CFC-12 in refrigerator-freezers than HFC-152a assuming safety is the main difference between the two alternatives. However, other issues, such as global warming potential and ozone depletion potential, influence the selection of replacement refrigerants and could outweigh the effects of the reduced safety of HFC-152a and other flammable refrigerants, such as hydrocarbons. MP39 retrofit for CFC-12 1993 Hua Xiao-Long and Chen Wei, 1993: The comparison of the performance of MP39 DuPont blends and CFC-12 in refrigerator/freezers. Paper presented at the International Conference on CFC and Halon Alternatives, 20-23 April, 1993, Beijing, China, pp. 159- 164 Conclusion: 13
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retrofitting with non-cfc substitutes

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