A Study of Thermoacoustic Refrigerator

Paper #:
  • 2017-01-0158

Published:
  • 2017-03-28
Abstract:
A diesel engine is advantageous in its high thermal efficiency, however it still wastes more than 50% of total input energy to exhaust and cooling losses. A feasibility study of thermoacoustic refrigerator was carried out as one of the means to recuperate waste heat. The thermoacoustic refrigerator prototyped for this study showed a capability to achieve cooling temperature lower than -20 degree C, which indicated that the system has a potential to be used in refrigerator trucks not only for cargo compartment cooling but also for cabin cooling. The experimental system was single loop type with its total length of 3160mm. A mixture of argon and helium was used as the working gas. Cordierite honeycombs of 100mm long with cell density of 1200 cpsi were used as the regenerators in both the heating and cooling parts. The heat exchanger, which was made of anoxic copper with high thermal conductivity, was maintained at room temperature by recirculating cooling water. The input heat was given by an eddy shaped micro heater at the location next to the regenerator in the heating part. The cooling point temperature at the center of the circular end surfaces of the regenerator of the cooling part was measured by a thermocouple. A resonator was made from a stainless steel pipe of 40A, which is commercially available, for reasonable manufacturing cost. With this thermoacoustic refrigerator system filled with working gas at 100kPa and given input energy of 330W to the micro heater, the minimum cooling temperature of -26 degree C was achieved. It indicated that the system had a sufficient potential to be used in refrigerator trucks and air-conditioning for cabs.
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