Experimental Study on The influence of the Porosity of Parallel Plate Stack on the Temperature Decrease of a Thermoacoustic Refrigerator
Penulis/Author
Ikhsan Setiawan, S.Si., M.Si. (1); Prof. Dr. Agung Bambang Setio Utomo, S.U. (2); Prof. Dr. Mitrayana, S.Si., M.Si. (3); Masafumi Katsuta (4); Makoto Nohtomi (5)
Tanggal/Date
10 2013
Kata Kunci/Keyword
Abstrak/Abstract
Thermoacoustic refrigerators are cooling devices which are environmentally
friendly because they don’t use hazardous gases like chlorofuorocarbons (CFCs) or
hydrofuorocarbons (HFCs) but rather air or inert gases as working medium. They apply sound
wave with high intensity to pump heat from the cold to hot the regions through a stack in a
resonator tube. One of the important parameters of thermoacoustic refrigerators is the porosity
(blockage ratio) of stack which is a fraction of cross sectional area of the resonator unblocked for
the gas movement by the stack. This paper describes an experimental study on how the porosity
of parallel plate stack affects the temperature decrease of a thermoacoustic refrigerator. The
porosity of parallel plate stack is specified by the thickness of plates and the spacing between
plates. We measured the maximum temperature decreases of thermacoustic refrigerator using
stacks with various porosities in the range of 0.5 - 0.85, with plate spacing from 0.5 mm to
1.5 mm and plate thicknesses 0.3 mm, 0.4 mm, and 0.5 mm. The measurements were done
with two resonators with length of 0.8 m and 1.0 m, with air at atmospheric pressure and
room temperature, correspond to thermal penetration depths (??) of 0.26 mm and 0.29 mm,
respectively. It was found that there is an optimum porosity which gives the largest temperature
decreases, and there is a tendency that the optimum porosity shifts to a larger value and the
temperature decrease become larger when we used a stack with thinner plates. On the other
hand, the study on the dependence of the temperature decrease on the plate thickness and the
plate spacing reveals more useful information than that on the stack porosity itself. We found
that stack with thinner plates tends to give larger temperature decrease, and the plate spacing
of around 4?? leads to the largest temperature decrease.
Rumpun Ilmu
Fisika
Bahasa Asli/Original Language
English
Level
Internasional
Status
Dokumen Karya
No
Judul
Tipe Dokumen
Aksi
1
Experimental study on the influence of the porosity.pdf
