Absorption panel cooling using a TFE-NMP mixture |
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| Affiliation: | 1. Postgraduate department of Physics, Mannar Thirumalai Naicker College, Madurai 625004, Tamil Nadu, India;2. Department of Physics, The Madura College, Madurai 625011, Tamil Nadu, India;3. Department of Physics, Thiagarajar College, Madurai 625009, Tamil Nadu, India;4. National Centre for Catalysis Research, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India;5. Department of Chemistry, Thiagarajar College, Madurai 625009, Tamilnadu, India;1. Department of Surgery; School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana, University Hospital, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana;2. Standford Children''s Health, Palo Alto, California, USA;3. Department of Surgery; School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana;4. Department of Medicine; School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana, Emergency Medicine Directorate, Komfo Anokye Teaching Hospital, Kumasi, Ghana;5. Department of Surgery; School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana;6. Department of Surgery, University of Washington, Seattle, WA, USA, Global Injury Control Section, Harborview Injury Prevention and Research Center |
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| Abstract: | A panel system for cooling buildings is proposed, working with an absorption-refrigeration unit, the evaporator of which is the panel itself. Trifluoroethanol (TFE) and N-methylpyrrolidinone (NMP) are proposed as refrigerant and absorbent, respectively. Use of the TFE-NMP mixture seems to offer advantages over the usual H2OLiBr or NH3H2O mixtures, and suits well the modest refrigeration temperatures needed in panel cooling. Analytical expressions are presented for the properties of the TFE-NMP mixture and a calculation procedure for NH3H2O units is used after suitable modifications to simulate the operation of the TFE-NMP absorption-refrigeration unit. Under the conditions considered, the lowest evaporation temperature varies from 3 to 16°C, and the theoretical coefficient of performance from 60% to 68.4%, with its maximum value obtained at 9°C. Under the above conditions, for panel cooling power 50–150 W/m2, a refrigerant mass flow rate through the panel from 400 g/m2 h to 1600 g/m2 h is needed with a driving thermal power from 80 W/m2 to 220 W/m2. |
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