Impact of the type of heat exchanger on the characteristics of low-temperature thermoacoustic heat engines

Volodymyr Korobko; Anatoliy Shevtsov; Serhiy Serbin; Huabing Wen; Marek Dzida

doi:10.1016/j.ijft.2024.100953

Impact of the type of heat exchanger on the characteristics of low-temperature thermoacoustic heat engines

Abstract

Thermoacoustic technologies are considered an effective solution for harnessing low-temperature heat, whether from waste or renewable sources. However, in practice, developing and implementing high-performance ther- moacoustic systems is a complex challenge. In real waste heat recovery systems, heat exchange between ther- moacoustic engines (TAEs) and external heat sources is facilitated by auxiliary systems, such as circulation loops that include recuperative heat exchangers. It is evident that the upper power limit of a TAE is constrained by the thermal performance of its internal heat exchangers. This article investigates the energy transfer processes be- tween the internal recuperative heat exchangers of a TAE and its matrix, and presents a mathematical model describing the interactions between the matrix and the heat exchangers. The model accounts for the effects of temperature inhomogeneities on the surface of the recuperative heat exchangers, which influence the temper- ature distribution within the TAE matrix. The use of liquid-gas recuperative heat exchangers in TAEs introduces temperature heterogeneity within the components of the thermoacoustic core. This study shows that such temperature variations can reduce the matrix gain factor for additional acoustic energy by a factor of 1.1 to 1.3. Therefore, when designing low-temperature thermoacoustic systems, it is essential to consider the type and characteristics of the heat exchangers used. The analysis indicates that recuperative heat exchangers can reduce the efficiency of thermoacoustic machines, whether they function as engines or refrigerators.

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Keywords

THERMOACOUSTIC THERMOACOUSTIC CORE RECUPERATIVE HEAT EXCHANGER TEMPERATURE DISTRIBUTION MATRIX GAIN FACTOR

Details

Category:

Articles

Type:

artykuły w czasopismach

Published in:

International Journal of Thermofluids no. 24,
ISSN:

Language:

English

Publication year:

2024

Bibliographic description:

Korobko V., Shevtsov A., Serbin S., Wen H., Dzida M.: Impact of the type of heat exchanger on the characteristics of low-temperature thermoacoustic heat engines// International Journal of Thermofluids -,iss. 100953 (2024), s.1-11

DOI: