Detailed simulation of fluted tube water heating condensers |
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Authors: | P G Rousseau M van Eldik G P Greyvenstein |
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Affiliation: | School of Mechanical and Materials Engineering, Potchefstroom University for CHE, Private Bag X6001, Potchefstroom 2520, South Africa |
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Abstract: | Fluted tube-in-tube condensers are key components in advanced energy efficient water heating heat pumps. Therefore, there exists a need for a computer design tool that incorporates all the essential features of these heat exchangers. This paper describes the development of a detailed model to simulate fluted tube refrigerant-to-water condensers. The model allows the surface area to be divided into any number of sections for which all the refrigerant and water properties can be evaluated. This allows for the extension of the model to simulate heat exchangers for cycles employing zeotropic refrigerant mixtures. For the waterside existing empirical equations are used for both friction and heat transfer. However, on the refrigerant side no correlations are available in the literature to calculate friction and heat transfer coefficients. The approach followed in this paper is therefore to use existing smooth tube correlations combined with enhancement ratios based on correlations available for helical coils as well as enhancement factors based on empirical data for fluted tube condensers. The model is validated with the aid of results from independent tests on two commercial fluted tube heat exchangers. The average difference between the simulated and measured pressure drops is 7.27% and the average difference for the log mean temperature difference (LMTD) is 4.41%. |
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Keywords: | Heat pump Condenser Tube Enhanced surface Water Heating Performance ModellingAuthor Keywords: Pompe à chaleur Condenseur Tube Surface augmenté e Eau Chauffage Performance Modé lisation |
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