Abstract
A detailed CFD modelling of an open refrigerated display cabinet has been formulated in a previous study. Some modifications are introduced in order to perform parametric studies dealing with low-cost geometrical and functional characteristics for improvement of the global performance and energy efficiency. The parametric studies are devoted to the analysis of the thermal response and behaviour inside the food conservation space influenced by (1) air flow rate through the evaporator heat exchanger; (2) air curtain behaviour; (3) hole dimensions and distribution of the back panel; (4) discharge and return grilles angles; and (5) flow deflectors inside the internal duct. The analysis of the numerical predictions from the parametric studies allows the development of an optimized model for the conception of an open refrigerated display cabinet with a more adequate configuration. The numerical predictions of the optimized model show lower product temperature and reduced electrical energy consumption, allowing the improvement of the food safety and the energy rationalization of the refrigeration equipment.
Highlights
Most of the refrigeration equipment installed in supermarkets are vertical refrigerated display cabinets opened to the surrounding air
Chen and Yuan [14] developed an experimental study to evaluate the influence of several effects: ambient temperature and relative humidity; indoor air flow; discharge air grille (DAG) velocity; air flow accross the perforated back panel (PBP); and night covers application, on the performance of an open refrigerated display cabinets (ORDC)
To the analysis of the thermal behaviour influenced by fans velocity, holes density and distribution on the PBP; DAG and return air grille (RAG) angles; and flow deflectors inside the internal duct
Summary
Most of the refrigeration equipment installed in supermarkets are vertical refrigerated display cabinets opened to the surrounding air. Chen and Yuan [14] developed an experimental study to evaluate the influence of several effects: ambient temperature and relative humidity; indoor air flow; DAG velocity; air flow accross the perforated back panel (PBP); and night covers application, on the performance of an ORDC. The analysis of numerical predictions of air flow and temperature performed in this previous work provides the assessment of geometrical and functional modifications concerning the conception, the project, and development of ORDC in order to improve its global performance behaviour This CFD model, on named as Base Case Study (BCS) was adapted in order to accommodate the geometry modifications required by the parametric studies. The variables calculated along the BC specification process (pressure drop and equivalent global heat transfer coefficient at the evaporator, viscous and inertial resistance coefficients at the PBP, RAG, and DAG) were recalculated in accordance to the specific case study details
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