TY - JOUR

T1 - Mathematical modeling of the geometrical sizing and thermal performance of a Dish/Stirling system for power generation

AU - Mendoza Castellanos, Luis Sebastian

AU - Carrillo Caballero, Gaylord Enrique

AU - Melian Cobas, Vladimir Rafael

AU - Silva Lora, Electo Eduardo

AU - Martinez Reyes, Arnaldo Martin

N1 - Publisher Copyright:
© 2017 Elsevier Ltd

PY - 2017

Y1 - 2017

N2 - This paper proposes a mathematical model for a solar Dish/Stirling system. Firstly, it is presented a methodology to calculate the appropriate angles and characterize the solar tracking control system for the city of Itajubá-MG/Brazil, in order to maximize the heat flow on the cavity of the receiver. Secondly, it was developed an algorithm for sizing and to determine the effects of opto-geometric parameters on the overall efficiency of the Dish/Stirling system. The model allows defining different configurations and geometric distances between the concentrator and the receiver, in order to obtain the desired heat in the receiver cavity. Finally, it is carried out a thermal balance for the evaluation of the maximum efficiency and overall efficiency of the system. The results obtained for a concentrator with a diameter of 10.5 [m] and solar irradiation of 1000 W/m2are: theoretical maximum working temperature in the receiver surface of 1596 K and a maximum thermal efficiency of 68%. It is observed that for collectors between 10 and 20 m of diameter, the overall efficiency variation is not significant (23–25%), since the variation of the temperature of the receiver and the thermal losses in the cavity are minimal for the evaluated conditions.

AB - This paper proposes a mathematical model for a solar Dish/Stirling system. Firstly, it is presented a methodology to calculate the appropriate angles and characterize the solar tracking control system for the city of Itajubá-MG/Brazil, in order to maximize the heat flow on the cavity of the receiver. Secondly, it was developed an algorithm for sizing and to determine the effects of opto-geometric parameters on the overall efficiency of the Dish/Stirling system. The model allows defining different configurations and geometric distances between the concentrator and the receiver, in order to obtain the desired heat in the receiver cavity. Finally, it is carried out a thermal balance for the evaluation of the maximum efficiency and overall efficiency of the system. The results obtained for a concentrator with a diameter of 10.5 [m] and solar irradiation of 1000 W/m2are: theoretical maximum working temperature in the receiver surface of 1596 K and a maximum thermal efficiency of 68%. It is observed that for collectors between 10 and 20 m of diameter, the overall efficiency variation is not significant (23–25%), since the variation of the temperature of the receiver and the thermal losses in the cavity are minimal for the evaluated conditions.

KW - Energy conversion

KW - Maximum efficiency

KW - Solar concentrator

KW - Solar energy

KW - Stirling engine

KW - Thermal analysis

UR - http://www.scopus.com/inward/record.url?scp=85011355689&partnerID=8YFLogxK

U2 - 10.1016/j.renene.2017.01.020

DO - 10.1016/j.renene.2017.01.020

M3 - Artículo Científico

AN - SCOPUS:85011355689

SN - 0960-1481

VL - 107

SP - 23

EP - 35

JO - Renewable Energy

JF - Renewable Energy

ER -