NEW TYPE OF ENERGY EFFICIENT HEAT EXCHANGER FOR INDIRECTLY COOLED DISPLAY CABINETS – LABORATORY AND FIELD TESTS

摘要

In this study, a completely new type of air-to-liquid heat exchanger, adapted for obtaining good heat transferrnperformance even at a laminar flow regime on the liquid side has been evaluated in a display cabinetrnapplication. The heat exchanger consists of parallel plates, with liquid in every second passage and air in thernother passages. Tests were performed with a traditional open vertical display cabinet, first with a traditionalrnfinned-tube coil and thereafter with the new type of heat exchanger, both in a climate chamber and thereafterrnin the field. The results from both tests showed that the liquid inlet temperature could be increased by aroundrn6℃, from the range -8℃- - 7℃ with the traditional coil to the range -2℃ - - 1℃ with the new type of heatrnexchanger, which can lead to considerable energy savings and operation without the need for defrosting ofrnthe heat exchanger.