Renew. Energy Environ. Sustain.
Volume 1, 2016
|Number of page(s)||5|
|Published online||06 June 2016|
Effect of variable heat input on the heat transfer characteristics in an Organic Rankine Cycle system
1 University POLITEHNICA of Bucharest, Splaiul Independenţei 313, Bucharest 060042, Romania
2 Splaiul Independenţei 313, Bucharest 060042, Romania
3 Rokura Company, Rahmaninov Street, Nr. 46-48, Bucharest, Romania
⁎ e-mail: email@example.com
This paper analyzes the heat transfer characteristics of an ORC evaporator applied on a diesel engine using measured data from experimental work such as flue gas mass flow rate and flue gas temperature. A mathematical model was developed with regard to the preheater, boiler and the superheater zones of a counter flow evaporator. Each of these zones has been subdivided into a number of cells. The hot source of the ORC cycle was modeled. The study involves the variable heat input's dependence on the ORC system's heat transfer characteristics, with especial emphasis on the evaporator. The results show that the refrigerant's heat transfer coefficient has a higher value for a 100% load from the diesel engine, and decreases with the load decrease. Also, on the exhaust gas side, the heat transfer coefficient decreases with the decrease of the load. The refrigerant's heat transfer coefficient increased normally with the evaporator's tube length in the preheater zone, and then increases rapidly in the boiler zone, followed by a decrease in the superheater zone. The exhaust gases’ heat transfer coefficient increased with the evaporator’ tube length in all zones. The results were compared with result by other authors and were found to be in agreement.
© M.H.K. Aboaltabooq et al., published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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