Effect of air temperature non-uniformity on water–air heat exchanger thermal performance – Toward innovative control approach for energy consumption reduction

M. Ramadan, M. Khaled, H. El Hage, F. Harambat and H. Peerhossaini

Applied Energy, 2016, vol. 173, issue C, 493 pages

Abstract: Parametric numerical analysis that explores the relation between the non-uniformity of air temperature distribution upstream of a heat exchanger and its thermal performance is performed. The obtained numerical results are employed toward the optimization of water–air heat exchanger thermal performance. Furthermore, the numerical results lay out the foundation to develop an innovative control approach for monitoring the airflow upstream of a cross-flow water–air heat exchanger that lead to the optimization of its thermal performance and energy consumption. Consequently, an in-house computational code is established to evaluate the aforementioned thermal performance based on known parameters; namely, distribution of upstream velocity and temperature of an air–liquid heat exchanger, the flow rate of heat exchanger liquid, in addition to the inlet liquid temperature. It was observed that non-uniformities in air temperature can, depending on the configuration, increase or decrease the thermal performance of a heat exchanger up to 5%. Additionally, controlling air temperature non-uniformities, the fuel consumption and carbon dioxide emission can be reduced by up to 0.97kg (1.34L) and 3.17kg respectively for a vehicle running three hours per day.

Keywords: Control approach; Energy consumption; Heat exchanger; Thermal performance; Air temperature uniformity; Computational code (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1016/j.apenergy.2016.04.076

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