0
Research Papers

Experimental Investigation of Thermal Storage Processes in a Thermocline Tank

[+] Author and Article Information
M. M. Valmiki, Wafaa Karaki, Jon Van Lew, Cholik Chan

Department of Aerospace and Mechanical Engineering,  The University of Arizona, Tucson, AZ 85721

Peiwen Li

Department of Aerospace and Mechanical Engineering,  The University of Arizona, Tucson, AZ 85721peiwen@email.arizona.edu

Jake Stephens

 US Solar Thermal Storage LLC, 1000 E. Water Street, Tucson, AZ 85719

J. Sol. Energy Eng 134(4), 041003 (Jul 05, 2012) (9 pages) doi:10.1115/1.4006962 History: Received September 11, 2011; Accepted May 26, 2012; Published July 05, 2012; Online July 05, 2012

This paper presents an experimental study of the energy charge and discharge processes in a packed bed thermocline thermal storage tank for application in concentrated solar power plants. A mathematical analysis was provided for better understanding and planning of the experimental tests. The mathematical analysis indicated that the energy storage effectiveness is related to fluid and solid material properties, tank dimensions, packing schemes of the solid filler material, and the durations of the charge and discharge times. Dimensional analysis of the governing equations was applied to consolidate many parameters into a few dimensionless parameters, allowing scaling from a laboratory system to an actual industrial application. Experiences on the system design, packing of solid filler material, system operation, and data analysis in a laboratory-scale system have been obtained in this work. These data are used to validate a recently published numerical solution method. The study will benefit the application of thermocline thermal storage systems in the large scale concentrated solar thermal power plants in industry.

FIGURES IN THIS ARTICLE
<>
Copyright © 2012 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic of a thermocline thermal storage tank with a discharging flow direction [28]

Grahic Jump Location
Figure 2

Schematic of the experimental setup

Grahic Jump Location
Figure 3

Comparison of HCR and HCRW for varying thermocline diameter with a wall thickness of 6.5 mm

Grahic Jump Location
Figure 4

Temperatures of the tank along the length of 65 cm for a single cycle (thermocouples were set every 5 cm)

Grahic Jump Location
Figure 5

Charging temperatures for TC 2, 6, 10, and 14 (left to right). TC 1 is the inlet and 14 is the outlet. Solid lines are simulated and dashed lines are experimental.

Grahic Jump Location
Figure 6

The charging temperature distribution along the height in the tank at time intervals of Πc /5. Solid lines are simulated and dashed lines are experimental.

Grahic Jump Location
Figure 7

Discharging temperatures for TC 2, 6, 10, and 14 (left to right). TC 1 is the inlet and 14 is the outlet. Solid lines are simulated and dashed lines are experimental.

Grahic Jump Location
Figure 8

The discharging temperature distribution along the height in the tank at different times. Solid lines are simulated and dashed lines are from experimental.

Grahic Jump Location
Figure 9

Experimentally and simulated dimensionless stored energy over a charging process

Grahic Jump Location
Figure 10

Experimentally and simulated dimensionless stored energy over a discharging process

Grahic Jump Location
Figure 11

Experimentally and simulated effectiveness for discharging over a range of flowrates

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In