Research Papers

Generalized Heat Flow Model of a Forced Air Electric Thermal Storage Heater Core

[+] Author and Article Information
Nicholas T. Janssen

Department of Mechanical Engineering,
University of Alaska Fairbanks,
Duckering 349, 306 Tanana Drive,
Fairbanks, AK 99775
e-mail: njanssen2@alaska.edu

Rorik A. Peterson

Department of Mechanical Engineering,
University of Alaska Fairbanks,
Duckering 351B, 306 Tanana Drive,
Fairbanks, AK 99775
e-mail: rapeterson@alaska.edu

Richard W. Wies

Department of Computer and
Electrical Engineering,
University of Alaska Fairbanks,
Duckering 213, 306 Tanana Drive,
Fairbanks, AK 99775
e-mail: rwwiesjr@alaska.edu

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received February 26, 2015; final manuscript received March 14, 2017; published online April 25, 2017. Assoc. Editor: Pradip Majumdar.

J. Thermal Sci. Eng. Appl 9(4), 041008 (Apr 25, 2017) (7 pages) Paper No: TSEA-15-1056; doi: 10.1115/1.4036366 History: Received February 26, 2015; Revised March 14, 2017

Electric thermal storage (ETS) devices can be used for grid demand load-leveling and off-peak domestic space heating (DSH). A high-resolution three-dimensional finite element model of a forced air ETS heater core is developed and employed to create a general charge/discharge model. The effects of thermal gradients, air flow characteristics, material properties, and core geometry are simulated. A simplified general stove discharge model with a single time constant is presented based on the results of the numerical simulations. This simplified model may be used to stimulate economic/performance case studies for cold climate communities interested in distributed thermal energy storage.

Copyright © 2017 by ASME
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Fig. 1

Primary components of a Steffes 2105 electric thermal stove [2]

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Fig. 2

Cross section of Steffes 2102 core

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Fig. 3

Simulation region anatomy (length units in inches)

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Fig. 4

Surface temperature solution for nominal parameter case

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Fig. 5

Discharge curves for flat velocity profile with fits shown

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Fig. 6

SOC and SD curves for SOC0 = 0.5 and u = 4 m/s

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Fig. 7

Results of the parameter sweep

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Fig. 8

Improvement in fit using two-parameter regression (u = 2 m/s)



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