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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Druckformat: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/.2014010661
pages 317-327

NUMERICAL ANALYSIS OF A THERMALLY DRIVEN THERMOACOUSTIC HEAT PUMP FOR LOW-GRADE HEAT RECOVERY

Zhibin Yu
School of Engineering, University of Glasgow, Glasgow, Scotland, United Kingdom
Ali Al-Kayiem
School of Engineering, University of Glasgow, Glasgow, Scotland, United Kingdom

ABSTRAKT

This paper presents the numerical analysis of a thermally driven thermoacoustic heat pump, which aims to utilize industrial waste heat to provide air conditioning for buildings where waste heat is abundant but air conditioning is required. The working gas is helium at 3.0 MPa. The operating frequency is around 100 Hz. A three-stage traveling wave thermoacoustic engine is designed to convert waste heat to acoustic power, and a single-stage traveling wave thermoacoustic cooler is connected to the engine to provide cooling at a temperature of 0° C for air conditioning. The ambient temperature is set as 40° C. A system with symmetric geometric configuration was initially modeled and validated by published experimental data. The asymmetric impedance distribution was observed, and then an asymmetric system which has different geometric dimensions at each stage was modeled to improve the acoustic conditions within the system. The simulation results show that the overall energy efficiency (defined as the ratio of the cooling power divided by the total heat input) of the tested system for the given temperature range can reach 15−17%, which shows the feasibility and potential for developing thermally driven thermoacoustic heat pump systems for utilizing waste heat to produce air conditioning.


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