TY - JOUR

T1 - Energy analysis and shadow modeling of a rectangular type salt gradient solar pond

AU - Aramesh, Mohamad

AU - Kasaeian, Alibakhsh

AU - Pourfayaz, Fathollah

AU - Wen, Dongsheng

N1 - Publisher Copyright:
© 2017 Elsevier Ltd

PY - 2017

Y1 - 2017

N2 - In calculating the total solar energy input into a salt gradient solar pond, the current method is insufficient mainly caused by two problems. Firstly, the existing equations of solar pond energy analysis can be only used for momentary calculations but it is very time-consuming for long time periods. Secondly, the shading effect inside the pond affects significantly the energy storage performance of the pond, especially in small ones. To solve the first problem, the mean values of variable parameters during the concerned time period is proposed in this work and the ‘first mean value theorem for definite integrals’ is used to derive the average values. For the second problem, a rectangular pond with vertical walls is investigated as an example, and the exact sunny areas in different depths of the pond are calculated at different time conditions. The experimental data of a published study is used for the validation. The energy efficiency of the low convective zone of the experimental pond is calculated theoretically, which shows a good agreement with the experimental value. The experimental data and theoretical results for the energy efficiency are 9.68% and 11.38% for January, 17.54% and 18.92% for May, and 28.11% and 30.94% for August, respectively. The modified equations can be used to predict a pond performance before its construction.

AB - In calculating the total solar energy input into a salt gradient solar pond, the current method is insufficient mainly caused by two problems. Firstly, the existing equations of solar pond energy analysis can be only used for momentary calculations but it is very time-consuming for long time periods. Secondly, the shading effect inside the pond affects significantly the energy storage performance of the pond, especially in small ones. To solve the first problem, the mean values of variable parameters during the concerned time period is proposed in this work and the ‘first mean value theorem for definite integrals’ is used to derive the average values. For the second problem, a rectangular pond with vertical walls is investigated as an example, and the exact sunny areas in different depths of the pond are calculated at different time conditions. The experimental data of a published study is used for the validation. The energy efficiency of the low convective zone of the experimental pond is calculated theoretically, which shows a good agreement with the experimental value. The experimental data and theoretical results for the energy efficiency are 9.68% and 11.38% for January, 17.54% and 18.92% for May, and 28.11% and 30.94% for August, respectively. The modified equations can be used to predict a pond performance before its construction.

KW - Energy analysis

KW - Salt gradient solar pond

KW - Shadow effect

UR - http://www.scopus.com/inward/record.url?scp=85014157867&partnerID=8YFLogxK

U2 - 10.1016/j.solener.2017.02.026

DO - 10.1016/j.solener.2017.02.026

M3 - Article

AN - SCOPUS:85014157867

SN - 0038-092X

VL - 146

SP - 161

EP - 171

JO - Solar Energy

JF - Solar Energy

ER -