Title: Optimal capacity planning of thermal storage tanks installed into energy supply systems

Authors: Koichi Ito, Takashi Shiba, Ryohei Yokoyama

Addresses: Department of Energy Systems Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, Osaka 593, Japan. ' Department of Energy Systems Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, Osaka 593, Japan. ' Department of Energy Systems Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, Osaka 593, Japan

Abstract: An optimal capacity planning problem is discussed for energy supply systems including thermal storage tanks. Equipment capacities and utility maximum demands are determined so as to minimize the annual total cost in consideration of the system|s operational strategy for energy demand varying hourly in a year. This optimization problem is solved using a hierarchical optimization method on the basis of a penalty one. The operational strategy for hourly energy demand is determined so as to minimize the daily operational cost. This optimal operational problem is solved efficiently from the viewpoint of computation time by a proposed approximate method. Lastly, a numerical study is carried out for three types of district heating and cooling systems to be compared. Through the study, the effectiveness of the proposed method is ascertained.

Keywords: economic evaluation; energy storage; optimal capacity planning; optimal operation; thermal storage tanks; energy supply; optimisation; district heating and cooling.

DOI: 10.1504/IJGEI.1997.063332

International Journal of Global Energy Issues, 1997 Vol.9 No.3, pp.162-170

Published online: 10 Jul 2014 *

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