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Advisor(s)
Abstract(s)
This paper reports the results of experimental tests performed according to ISO 23953 in an open multideck
display cabinet with dual air curtain to evaluate the impact of the evaporator fins arrangement pattern on the
overall thermal performance. Experimental laboratory tests were performed on climate class no. 3 (25 °C and
60%) with three different evaporator configurations. The thermal exchange area was the same among the three
models to keep the aluminum fins and cooper tubes cost constant. The study investigates the increase on the
operation time before defrost and the minimization of the latent thermal load due water condensation and
freezing between the evaporator fins. Compared to the uniform fin pitch, it was possible to reduce 18% the frost
mass and, thus, increasing the refrigeration time between defrosts and decreasing 14% the total heat load.
However, an increase on the air (+0.6 °C) and product temperatures (+1.9 °C) due to an inefficient heat exchange, leads to new analysis and assessments related to the residence time between the fins and the airflow in order to keep the temperatures low at the refrigerated space and thus ensuring food safety.
Description
Keywords
Fins arrangement pattern Open refrigerated display cabinet Thermal performance Frost formation Heat loads
Citation
Publisher
Elsevier