Analytical 1D models of the wall thermal resistance of rectangular minichannels applied in heat exchangers

• Autorzy: Rybiński W. , Mikielewicz J.

Identyfikatory

DOI

10.1515/aoter-2016-0020

• Języki publikacji: EN

Abstrakty

EN

The paper presents four 1-dimensional models of thermal resistance of walls in a heat exchanger with rectangular minichannels. The first model is the simplest one, with a single wall separating two fluids. The second model of the so called equivalent wall takes into account total volume of intermediate walls between layers of minichannels and of side walls of minichannels. The next two more complicated models take separately into account thermal resistance of these walls. In these two models side walls are treated as fins. The results of models comparison are presented. It is shown that thermal resistance may be neglected for metal walls but it should be taken into account for the walls made of plastics. For the case of non-neglected wall thermal resistance the optimum wall thickness was derived. Minichannel heat exchangers made of plastic are larger than those built of metal, but are significantly cheaper. It makes possible to use of such exchangers in inexpensive microscale ORC installations.

Słowa kluczowe

EN

minichannel heat exchanger; wall thermal resistance; rectangular minichannel

PL

minikanał; wymiennik ciepła; izolacja termiczna ścian; minikanał prostokątny

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2016
• Tom: Vol. 37, no. 3
• Strony: 63--78
• Opis fizyczny: Bibliogr. 4 poz., rys., tab., wz.

Twórcy

autor

Rybiński W.

• Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

autor

Mikielewicz J.

• Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

Bibliografia

• [1] Cevallos J.G., Bergles A.E., Bar-Cohen A., Rodgers P., Gupta S.K.: Polymer Heat Exchangers – History, Opportunities, and Chal lenges. Heat Transfer Eng. 33(2012), 13, 1075–1093.
• [2] Mikielewicz D. et al.: Selected topics of design and investigation of heat exchangers for ORC in a domestic CHP. IFFM PAS Publishers, Gdańsk 2013 (in Polish).
• [3] Rybiński W., Mikielewicz J.: Analytical solutions for laminar flow exchanging heat in rectangular channels. Arch. Thermodyn. 35(2014), 4, 29–42.
• [4] Shah R.K., London A.L.: Laminar flow forced convection in ducts. Academic Press, New York 1978.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.