Improving Discharge Characteristics of Indirect Integral Collector Storage Systems with Multi-Element Storage

Citation data:

Proceedings of the 2004 International Solar Energy Conference (2004, Portland, OR)

Publication Year:
2004
Usage 2
Abstract Views 2
Repository URL:
http://scholarsmine.mst.edu/mec_aereng_facwork/2475
Author(s):
Homan, Kelly; Boies, A. M
Publisher(s):
American Society of Mechanical Engineers (ASME)
Tags:
Heat Exchanger; Storage Volume; Temperature Limited Performance; Thermal Storage; Heat storage devices; Heat Exchanger; Storage Volume; Temperature Limited Performance; Thermal Storage; Heat storage devices; Aerospace Engineering; Mechanical Engineering
conference paper description
Desired performance of unpressurized integral collector storage systems hinges on the appropriate selection of storage volume and the immersed heat exchanger. This paper presents analytical results expressing the relation between storage volume, number of heat exchanger transfer units and temperature limited performance. For a system composed of a single storage element, the limiting behavior of a perfectly stratified storage element is shown to be superior to a fully-mixed storage element, consistent with more general analysis of thermal storage. Since, however, only the fully-mixed limit is readily obtainable in a physical system, the present paper also examines a division of the storage volume into separate compartments. This multi-element storage system shows significantly improved discharge characteristics as a result of improved elemental area utilization and temperature variation between elements, comparable in many cases to a single perfectly-stratified storage element. In addition, the multi-element system shows increased robustness with respect to variations in heat exchanger effectiveness and initial storage temperature.