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The aim of this investigation is to characterize the transient performance of different heat exchangers for their design and efficient control. This paper explored the effect of inlet mass flow rate and temperature step variations on the dynamic response of a conventional and a minichannel heat exchanger. The work was also extended to include a comparison between these two heat exchangers when both subjected to sudden changes in the liquid inlet conditions. A comprehensive, well-equipped, and large-scale experimental setup was designed and assembled to examine the thermal performance of different heat exchangers under steady and transient changes. At the early stage of a step change, the influence of changing mass flow and inlet temperature of the hot fluid on the response time is found significant while, this effect diminishes as the system approaches steady state. The hot liquid inlet conditions change of mass flow and temperature have more significant effect on the minichannel liquid outlet temperature when compared to the conventional heat exchanger. The reported results can find an application in the design and selection of a cross flow heat exchanger used in thermal management systems such as in automotive industry where compact heat exchanger is required for size and weight reduction.

Transient Behaviour of Heat Exchangers Under Inlet Perturbations