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Correction of Logarithmic Mean Temperature Difference in a compact brazed plate evaporator assuming heat flux governed flow boiling heat transfer coefficient
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0003-3896-2443
2005 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 28, no 4, 573-578 p.Article in journal (Refereed) Published
Abstract [en]

The heat transfer in heat exchangers is commonly calculated using the concept of Logarithmic Mean Temperature Difference (LMTD). As is well known this approach is only valid for counter-current and co-current heat exchanger configurations. For other configurations, corrections for the deviation from pure counter-current are introduced. From any standard text book in heat transfer it may be found that the LMTD approach may also be used if condensation and evaporation occurs in the heat exchanger. The purpose of the present paper is to investigate if the LMTD approach can be used in a compact brazed plate evaporator. It will be shown through integration of the governing equations that the LMTD approach indeed may be used for practical cases, even though deviations occur at small logarithmic mean temperature differences. The article presents suggestions on the correction factor (F) needed under some simplified assumptions in a compact brazed plate heat exchanger operating as an evaporator for heat pump and refrigeration applications.

Place, publisher, year, edition, pages
2005. Vol. 28, no 4, 573-578 p.
Keyword [en]
plate exchanger, evaporator, calculation, temperature difference, heat flux, heat transfer coefficient, boiling
URN: urn:nbn:se:kth:diva-14778DOI: 10.1016/j.ijrefrig.2004.09.011ISI: 000229380600014ScopusID: 2-s2.0-18144367740OAI: diva2:332819
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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