TY - GEN
T1 - Analysis of thermal stresses in square ducts of solar receivers operated with liquid sodium
AU - Gonzalez, F.
AU - Barraza, R.
AU - Schaub, T.
AU - Estay, D.
AU - Guzman, L.
N1 - Publisher Copyright:
© 2019. The Authors. Published by International Solar Energy Society Selection and/or peer review under responsibility of Scientific Committee
PY - 2020
Y1 - 2020
N2 - One of the failures in the solar receivers is usually produced by thermal stresses caused by the non-uniformity of the concentrated solar flux and the transient behavior of the climate. The use of liquid sodium as a heat transfer fluid allows to reach higher temperatures to feed more efficient power systems, however, this produces an increase in thermal stresses, putting the safety of the facilities at risk. The change of geometry is an alternative to improve the thermo-mechanical behavior of the receiver tubes. To compare the thermal and hydraulic characteristics, parameters such as the Reynolds number, the pressure loss, the internal heat transfer coefficient, and the mass flow are determined. With these, six equivalences are tested between conventional tubes and square ducts. The results show that for all the conditions of equivalence the thermal stress increases in comparison with a conventional tube, specifically in the corners of the square duct, however, the characteristics of heat transfer and pressure drop can be maintained and improved. These results imply that the use of other geometries can benefit the overall efficiency of the receiver as well as affect the levelized cost of electricity (LCOE).
AB - One of the failures in the solar receivers is usually produced by thermal stresses caused by the non-uniformity of the concentrated solar flux and the transient behavior of the climate. The use of liquid sodium as a heat transfer fluid allows to reach higher temperatures to feed more efficient power systems, however, this produces an increase in thermal stresses, putting the safety of the facilities at risk. The change of geometry is an alternative to improve the thermo-mechanical behavior of the receiver tubes. To compare the thermal and hydraulic characteristics, parameters such as the Reynolds number, the pressure loss, the internal heat transfer coefficient, and the mass flow are determined. With these, six equivalences are tested between conventional tubes and square ducts. The results show that for all the conditions of equivalence the thermal stress increases in comparison with a conventional tube, specifically in the corners of the square duct, however, the characteristics of heat transfer and pressure drop can be maintained and improved. These results imply that the use of other geometries can benefit the overall efficiency of the receiver as well as affect the levelized cost of electricity (LCOE).
KW - Concentrated solar power
KW - Liquid sodium
KW - Receiver
KW - Thermal stress
UR - http://www.scopus.com/inward/record.url?scp=85086828630&partnerID=8YFLogxK
U2 - 10.18086/swc.2019.01.04
DO - 10.18086/swc.2019.01.04
M3 - Conference contribution
AN - SCOPUS:85086828630
T3 - Proceedings of the ISES Solar World Congress 2019 and IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2019
SP - 24
EP - 31
BT - Proceedings of the ISES Solar World Congress 2019 and IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2019
A2 - Cardemil, Jose Miguel
A2 - Guthrie, Ken
A2 - Ruther, Ricardo
PB - International Solar Energy Society
T2 - ISES Solar World Congress 2019, SWC 2019 and IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2019, SHC 2019
Y2 - 4 November 2019 through 7 November 2019
ER -
