Liquid side heat transfer and pressure drop in finned-tube cooling-coils operated with secondary refrigerants |
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| Authors: | Caroline Haglund Stignor, Bengt Sund n,Per Fahl n |
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| Affiliation: | aSP Technical Research Institute of Sweden, Energy Technology, P.O. Box 857, S-501 15 Borås, Sweden;bLund Institute of Technology, Division of Heat Transfer, P.O. Box 118, S-221 00 Lund, Sweden;cChalmers University of Technology, Building Services Engineering, S-412 96 Gothenburg, Sweden |
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| Abstract: | In this study full-scale experiments with two different conventional cooling-coils aimed for display cabinets were performed. Heat transfer and pressure drop on the liquid side for three different single phase secondary refrigerants were studied and compared to predictions by existing correlations. Predominantly, the laminar flow regime was studied. The results show that when predicting the heat transfer performance on the liquid side of a cooling-coil the Gnielinski correlation for thermally developing flow and uniform wall temperature boundary conditions (T) leads to good agreement for 0.0014 < x* < 0.017 if 50 < Re < 1700, assuming a new entrance length is formed after each U-bend. In addition, these entrance lengths must also be accounted for, when predicting the pressure drop on the liquid side of the cooling-coil. The uncertainty of measurement can be a problem in this type of investigations and this has been taken into consideration when analysing the results. |
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| Keywords: | Refrigeration Display cabinet Heat exchanger Finned tube Experiment Heat transfer Pressure drop Secondary refrigerant Propylene glycol Laminar flowMots clé s: Ré frigé ration Meuble de vente É changeur de chaleur Tube aileté Expé rimentation Transfert de chaleur Chute de pression Frigoporteur Propylè ne glycol É coulement laminaire |
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