Effect of variable heat input on the heat transfer characteristics in an Organic Rankine Cycle system
| Autor: | Malina Prisecaru, Horatiu Pop, Ana-Maria Alexandru, Valentin Apostol, Cristian Petcu, Cristina Ciobanu, Elena Pop, Mahdi Hatf Kadhum Aboaltabooq, Gheorghe Popescu, Tudor Prisecaru |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Organic Rankine cycle
Materials science 020209 energy lcsh:TJ807-830 General Engineering Boiler (power generation) lcsh:Renewable energy sources Thermodynamics Exhaust gas 02 engineering and technology Heat transfer coefficient Mechanics Diesel engine Refrigerant 020401 chemical engineering lcsh:Energy conservation Heat transfer 0202 electrical engineering electronic engineering information engineering Air preheater lcsh:TJ163.26-163.5 0204 chemical engineering |
| Zdroj: | Renewable Energy and Environmental Sustainability, Vol 1, p 13 (2016) |
| ISSN: | 2493-9439 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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