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Heat transfer in cross-corrugated ducts
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Plate heat exchangers, PHE, are commonly found in the industry today. The main advantages over conventional designs are relatively small size, high heat transfer, easy maintenance and low fouling. The PHE consist of a large number of plates clamped together, where the most commonly used plates have a corrugated geometry. The media flow in a countercurrent manner and heat exchange take place between each plate. The effect of the corrugation angle on heat transfer has in this study been investigated. This was performed in two rectangular test samples with different corrugation angles and in a new circular sample, which was designed and manufactured. The advantage with a circular design is that the corrugation angle can be varied, and the most beneficial angle considering heat transfer can easily be found. In the circular sample a new configuration of the plates, where the corrugations of the top and bottom plate are aligned parallel with the main flow direction, was tested. Heat transfer experiments were performed with water (3.5 < pr < 5.5) for reynolds number ranging from 400 to 2500. in the rectangular test samples the heat transfer was found to increase with up to 50% when increasing the corrugation angle from 45 to 60 deg. higher heat transfer generally means an increase in pressure drop through the heat exchanger. for the circular test sample, maximum heat transfer was found for an angle between the corrugations around 55 deg. increasing the angle further decreased the heat transfer. the new configuration was found to improve the heat transfer compared to the rectangular test sample with conventional configuration. together with a small pressure drop this makes the new configuration very interesting. the literature review revealed that there must be other factors influencing the heat transfer than the corrugation angle. one of these factors is the geometry (pitch and height) of the corrugation. this is not enough to account for the differences in the results from various studies and further research is therefore needed to fully understand the principles of heat transfer in cross-corrugated ducts.

Place, publisher, year, edition, pages
Keyword [en]
Technology, energy engineering, heat transfer, heat exchangers, plate, heat exchangers, cross-corrugated ducts, corrugation angle
Keyword [sv]
URN: urn:nbn:se:ltu:diva-47675ISRN: LTU-EX--01/293--SELocal ID: 530f2e4c-1e70-4cf7-91ae-2ec3bbfdd2e1OAI: diva2:1021003
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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