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Advisor(s)
Abstract(s)
This paper reports the experimental results with an open multideck display case with dual air
curtain. Manufacturers seek during the design phase of the equipment to certify its suitability to the testing
standards with the lowest energy consumption and ensuring food safety. The testing standard ISO 23953 is
usually followed to determine the equipment's thermal cooling load. However, some manufacturers use
different procedures to set the external air velocity. The thermal cooling load will depend upon it. According to
ISO 23953, the mean horizontal air velocity, with the refrigerated display case switched off, shall be 0.2 m/s.
Thus, this paper reports the experimental results of tests where the initial procedure of setting the air velocity
was performed by two different methods: (1) with the display case cooling on (2) and switched off as required
by ISO 23953. The comparison of experimental results for the two conditions (switched off relatively to
switched on) provide the quantitative variation of frost formation (-24%) and condensed water (+180%) on the
evaporator coil and how this phenomena affects the distribution and magnitudes of air velocity (+7%); inlet
(+5.9°C) and outlet temperatures (+5.5°C); the components of the total sensible (+10%) and latent (+15%) heat
loads; and the average product temperatures (+176%). The analysis of experimental data provides the necessary
basis to conclude that the initial procedure how the air movement is set affects significantly the performance of
the equipment under testing. The results show that air movement procedure defined in the standard, although
providing a higher thermal cooling load, is the most appropriated since the equipment will be able to operate
correctly under more demanding ambient conditions and thus its design provides a better thermal performance.
Description
Keywords
Refrigeration Display case Experimental testing Heat loads Frost formation Airflow distribution
Citation
Publisher
5th International Conference on Fluid Mechanics and Heat & Mass Transfer (FLUIDSHEAT'14)