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 transferperformance even at a laminar flow regime on the liquid side has been evaluated in a display cabinetapplication. The heat exchanger consists of parallel plates, with liquid in every second passage and air in theother passages. Tests were performed with a traditional open vertical display cabinet, first with a traditionalfinned-tube coil and thereafter with the new type of heat exchanger, both in a climate chamber and thereafterin the field. The results from both tests showed that the liquid inlet temperature could be increased by around6°C, from the range -8°C- - 7°C with the traditional coil to the range -2°C - - 1°C with the new type of heatexchanger, which can lead to considerable energy savings and operation without the need for defrosting ofthe heat exchanger.