Accession Number : ADA300644

Title :   High Frequency Thermoacoustic Refrigerator.

Descriptive Note : Annual summary rept. 1 Jun 94-31 May 95,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS

Personal Author(s) : Symko, Orest G.

PDF Url : ADA300644

Report Date : 15 AUG 1995

Pagination or Media Count : 11

Abstract : Results are presented on the development of a high frequency thermoacoustic refrigerator and its performance. The device consists of a piezoelectric driver, operated around 5kHz, which is coupled to a cylindrical resonator containing air at 1 atmosphere as the compressible fluid. For sound levels of 155dB at the stack, a maximum T of 41 C was reached across a cotton wool stack 4mm long. A cooling power of 1.2 watt was achieved with a coefficient of performance of 3. This simple and lightweight refrigerator shows promise for cooling of small samples and electronic components. The performance of this type of refrigerator at high frequencies leads to high efficiency and power density. Research is aimed at improving its performance by optimizing some of the critical parameters such as the sound level and the thermal interface between stack and heat exchangers. (MM)

Descriptors :   *REFRIGERATION SYSTEMS, THERMAL PROPERTIES, HIGH FREQUENCY, THERMODYNAMICS, ELECTRONIC EQUIPMENT, HEAT EXCHANGERS, COOLING, COMPRESSIBLE FLOW, COPPER, PIEZOELECTRICITY, LIGHTWEIGHT, ACOUSTICS, RESONATORS, DRIVES(ELECTRONICS), COMPRESSIVE PROPERTIES, HEAT PUMPS.

Subject Categories : Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE