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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v1.i4.40
pages 359-373

THE NEW CONCEPT OF CAPILLARY FORCES AIDED EVAPORATOR FOR APPLICATION IN DOMESTIC ORGANIC RANKINE CYCLE

Dariusz Mikielewicz
Gdansk University of Technology, Faculty of Mechanical Engineering, 80-233 Gdansk, ul. Narutowicza 11/12, Poland
Pawel Szymanski
Gdansk University of Technology, Faculty of Mechanical Engineering, 80-233 Gdansk, ul. Narutowicza 11/12, Poland
Krzysztof Blauciak
Gdansk University of Technology, Faculty of Mechanical Engineering, 80-233 Gdansk, ul. Narutowicza 11/12, Poland
Jan Wajs
The Szewalski Institute of Fluid-Flow Machinery PAS, ul. Fiszera 14, 80-231 Gdansk; Gdansk University of Technology, Faculty of Mechanical Engineering, 80-233 Gdansk, ul. Narutowicza 11/12, Poland
Jaroslaw Mikielewicz
Institute of Fluid-Flow Machinery, Polish Academy of Science, 80-952 Gdansk, ul. Fiszera 14, Poland
Eugeniusz Ihnatowicz
Institute of Fluid-Flow Machinery, Polish Academy of Science, 80-952 Gdansk, ul. Fiszera 14, Poland

ABSTRACT

This paper presents studies on the possibility of applying capillary forces induced in the porous structure to a modern design of evaporator. The potential application of such heat exchanger is for example an evaporator of the domestic micro combined heat and power (CHP) unit. One of the problems in the micro-CHP is excessive demand for pumping power. The proposed design helps in overcoming that issue. In the evaporator outlined in the paper, there is a possibility of reducing the demand for pumping power, as the evaporator produces the extra pressure effect due to action of capillary forces. If successful, the cycle circulation pump operates only to compensate the pressure drop due to friction losses in the loop, whereas the wick covers the demand to overcome the pressure drop in the expansion device. Out of 14 tested fluids 3 were selected for further scrutiny, namely ethanol, water, and ammonia. It has been assumed that the fluid should work in the evaporator at temperature of 160°C. The results of surface tension distributions with respect to temperature are been presented in the figures. Preliminary analysis of the results indicates that water has the best potential; however, taking all issues into account, it can be said that the best effect is obtained using ethanol.

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