Cooldown Measurements in a Standing Wave Thermoacoustic Refrigerator

TL;DR

This paper investigates how charging pressure and vacuum conditions influence the cold end temperature and cooldown performance of a standing wave thermoacoustic refrigerator, providing insights into optimizing its efficiency.

Contribution

It presents experimental analysis of charging pressure effects on cold end temperature and cooldown in a standing wave TAR, including the impact of vacuum conditions.

Findings

Higher charging pressure affects cold end temperature.

Vacuum around the cold end improves performance.

Cooldown duration varies with pressure changes.

Abstract

Thermoacoustic Refrigerators (TARs) use acoustic power to generate cold temperatures. Apart from the operating frequency and the mean temperature of the working medium, the charging pressure and the dynamic pressure in the TAR govern its attainable cold temperature. The effect of charging pressure on the dynamic pressure in a loudspeaker driven gas filled standing wave column has been well understood. The present work aims to investigate the effect of charging pressure on the cold end temperature of a standing wave TAR. The cold end temperature lift and the cooldown for several changing pressures are reported. The effect of vacuum around the cold end on the TAR performance is also presented.