Presented research is an experimental study of the performance of a standard plate heat exchanger evaporator, both with and without a novel nano- and microporous copper structure, used to enhance the boiling heat transfer mechanism in the refrigerant channel. Various distance frames in the refrigerant channel were also employed to study the influence of the refrigerant mass flux on two-phase flow heat transfer. The tests were conducted at heat fluxes ranging between and with 134a as refrigerant. Pool boiling tests of the enhancement structure, under similar conditions and at various surface inclination angles, were also performed for reasons of comparison. The plate heat exchanger with the enhancement structure displayed up to ten times enhanced heat transfer coefficient in the refrigerant channel, resulting in an improvement in the overall heat transfer coefficient with over 100%. This significant boiling enhancement is in agreement with previous pool boiling experiments and confirms that the enhancement structure may be used to enhance the performance of plate heat exchangers. A simple superposition model was used to evaluate the results, and it was found that, primarily, the convective boiling mechanism was affected by the distance frames in the standard heat exchanger. On the other hand, with the enhanced boiling structure, variations in hydraulic diameter in the refrigerant channel caused a significant change in the nucleate boiling mechanism, which accounted for the largest effect on the heat transfer performance.
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e-mail: richard.furberg@energy.kth.se
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Research Papers
The Use of a Nano- and Microporous Surface Layer to Enhance Boiling in a Plate Heat Exchanger
Richard Furberg,
Richard Furberg
School of Industrial Engineering and Management, Department of Applied Thermodynamics and Refrigeration,
e-mail: richard.furberg@energy.kth.se
Royal Institute of Technology
, Stockholm 10044, Sweden
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Björn Palm,
Björn Palm
School of Industrial Engineering and Management, Department of Applied Thermodynamics and Refrigeration,
Royal Institute of Technology
, Stockholm 10044, Sweden
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Shanghua Li,
Shanghua Li
School of Information and Communication Technology, Division of Functional Materials,
Royal Institute of Technology
, Stockholm 10044, Sweden
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Muhammet Toprak,
Muhammet Toprak
School of Information and Communication Technology, Division of Functional Materials,
Royal Institute of Technology
, Stockholm 10044, Sweden
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Mamoun Muhammed
Mamoun Muhammed
School of Information and Communication Technology, Division of Functional Materials,
Royal Institute of Technology
, Stockholm 10044, Sweden
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Richard Furberg
School of Industrial Engineering and Management, Department of Applied Thermodynamics and Refrigeration,
Royal Institute of Technology
, Stockholm 10044, Swedene-mail: richard.furberg@energy.kth.se
Björn Palm
School of Industrial Engineering and Management, Department of Applied Thermodynamics and Refrigeration,
Royal Institute of Technology
, Stockholm 10044, Sweden
Shanghua Li
School of Information and Communication Technology, Division of Functional Materials,
Royal Institute of Technology
, Stockholm 10044, Sweden
Muhammet Toprak
School of Information and Communication Technology, Division of Functional Materials,
Royal Institute of Technology
, Stockholm 10044, Sweden
Mamoun Muhammed
School of Information and Communication Technology, Division of Functional Materials,
Royal Institute of Technology
, Stockholm 10044, SwedenJ. Heat Transfer. Oct 2009, 131(10): 101010 (8 pages)
Published Online: July 31, 2009
Article history
Received:
September 27, 2008
Revised:
April 15, 2009
Published:
July 31, 2009
Citation
Furberg, R., Palm, B., Li, S., Toprak, M., and Muhammed, M. (July 31, 2009). "The Use of a Nano- and Microporous Surface Layer to Enhance Boiling in a Plate Heat Exchanger." ASME. J. Heat Transfer. October 2009; 131(10): 101010. https://doi.org/10.1115/1.3180702
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