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Research Papers: Energy Systems Analysis

An Experimental Study on Heterogeneous Porous Stacks in a Thermoacoustic Heat Pump

[+] Author and Article Information
Syeda Humaira Tasnim

School of Engineering,
University of Guelph,
50 Stone Road East,
Guelph, ON N1G 2W1, Canada

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 29, 2016; final manuscript received February 20, 2017; published online March 30, 2017. Assoc. Editor: Esmail M. A. Mokheimer.

J. Energy Resour. Technol 139(4), 042005 (Mar 30, 2017) (8 pages) Paper No: JERT-16-1531; doi: 10.1115/1.4036053 History: Received December 29, 2016; Revised February 20, 2017

Growing evidence suggests that research must be done to develop energy efficient systems and clean energy conversion technologies to combat the limited sources of fossil fuel, its high price, and its adverse effects on environment. Thermoacoustic is a clean energy conversion technology that uses the conversion of sound to thermal energy and vice versa for the design of heat engines and refrigerators. However, the efficient conversion of sound to thermal energy demands research on altering fluid, operational, and geometric parameters. The present study is a contribution to improve the efficiency of thermoacoustic devices by introducing a novel stack design. This novel stack consists of alternative conducting and insulating materials or heterogeneous materials. The author examined the performance of eight different types of heterogeneous stacks (combination 1–8) that are only a fraction of the displacement amplitude long and consisted of alternating aluminum (AL) and Corning Celcor or reticulated vitreous carbon (RVC) foam materials. From the thermal field measurements, the author found that combination eight performs better (12% more temperature difference at the stack ends) than all the other combinations. One interesting feature obtained from these experiments is that combination 7 produces the minimum temperature at the cold end (17% less than other combinations). The thermal performance of the heterogeneous stack is compared to that of the traditional homogeneous stack. Based on the study, the newly proposed stack design provides better cooling performance than a traditionally designed stack.

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Figures

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Fig. 1

A thermoacoustic heat pump and the measuring systems

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Fig. 2

Eight combinations of heterogeneous stack structure are shown in (a)–(h): (a) combination 1 (40 PPI AL + 45 PPI RVC + 40 PPI AL), (b) combination 2 (40 PPI AL + 80 PPI RVC + 40 PPI AL), (c) combination 3 (40 PPI AL + 80 PPI RVC + 40 PPI AL + 80 PPI RVC), (d) combination 4 (80 PPI RVC + 40 PPI AL + 80 PPI RVC + 40 PPI AL), (e) combination 5 (20 PPI AL + 1 cm Celcor + 20 PPI AL), (f) combination 6 (40 PPI AL + 1 cm Celcor + 40 PPI AL), (g) combination 7 (80 PPI RVC + 1 cm Celcor + 80 PPI RVC), and (h) combination 8 (100 PPI RVC + 1 cm Celcor + 100 PPI RVC)

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Fig. 3

(a) Maximum temperature difference produced by three different homogeneous stack materials and (b) temperature difference produced by 80 PPI RVC stacks as length varies from 1 to 4 cm

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Fig. 4

Temperature difference versus nondimensional stack center position form the pressure antinode for heterogeneous stacks (combination 1–4)

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Fig. 5

Temperature difference versus nondimensional stack center position form the pressure antinode for three homogeneous and a heterogeneous stack (combination 3)

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Fig. 6

Temperature difference versus nondimensional stack center position form the pressure antinode for heterogeneous stacks (combination 5–8)

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Fig. 7

Temperature difference versus nondimensional stack center position form the pressure antinode for different stack material composition

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Fig. 8

Time evolution of temperature profiles at two extreme ends of the stack for: (a) combination 2, (b) combination 7, and (c) combination 8

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