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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.v5.i1-4.730
pages 627-638

EVAPORATOR USING HEAT PIPE HEAT EXCHANGER FOR A HEAT RECOVERY SYSTEM

L. A. Betancur A.
Universidad Nacional de Colombia, Facultad de Minas, Cra 80 N°65-223, Medellin, Colombia
F. Chejne J.
Universidad Nacional de Colombia, Facultad de Minas, Cra 80 N°65-223, Medellin, Colombia

ABSTRACT

The recovery system consists in a heat pipes based heat exchanger that allows the efficient transfer of the waste energy to a heat pump refrigerant which the heat is transferred. The experimental work involved the characterization of the previously built heat pipes by measuring the thermal resistance under different operating conditions, such as the pipe's horizontal inclination, thermal bath temperature and supplied power. It was found that the average thermal resistance of the heat pipes is 0.02[K/W] for the 50-300 W power range. With these data, the heat recovery system (a bench of tubes) was designed, formed by 90 tubes with 2.54cm diameter and 500cm length. A CFD program based on Comsol 4.2a was developed for simulating the energy transfer between the humidified air and the heat pipes. It was used for sizing the heat pipes exchanger, predicting the humidified air condensation and evaluating the pressure drop through the tubes array. Finally falling film evaporation was simulated with Comsol 4.2a to quantify the refrigerant evaporation rate; also the heat transferred from the heat pipes to refrigerant was calculated with empirical correlations of several authors.


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