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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-472-4

ISBN Online: 978-1-56700-471-7

3rd Thermal and Fluids Engineering Conference (TFEC)
March, 4–7, 2018, Fort Lauderdale, FL, USA

SYSTEM-LEVEL OPTIMIZATION OF FAN-SUPPLIED TUBE-FIN EVAPORATORS FOR FROSTING CONDITIONS

Get access (open in a dialog) pages 973-976
DOI: 10.1615/TFEC2018.fip.021474

Resumo

This research work is aimed at finding out the optimal design (i.e. number of transversal and longitudinal tube rows, number of fins) of fan-supplied tube-fin evaporators for light commercial refrigeration applications operating under frosting conditions. Quasi-steady-state algebraic models were put forward for the refrigeration cycle components for computing not only the cooling capacity depletion due to the evaporator frosting over time, but also the changes experienced by the evaporating temperature and their effect on the compressor power. Transient algebraic models were also advanced to account for the temperature and humidity variations inside the refrigerated compartment, and so the compressor runtime. The optimization exercise aiming at system-level energy consumption minimization (i.e. compressor, fan and defrost heater power consumption) revealed that, when the evaporator volume and width were held constrained, the lowest energy consumption was achieved for evaporators with 4 transversal by 4 longitudinal tubes. Similar energy consumption results were observed for evaporators with (3×6) and (6×3) (transversal tubes × longitudinal tubes), these being costlier than the optimal solution, suggesting that the optimal geometry is independent on the aspect ratio for fan-supplied conditions.