Open Frozen Food, Showcases
Open the frozen products showcase shown in Fig. 14-23. Storage and display of frozen products in open or closed cabinets presents some problems. The temperature is around 0F (-18C) should be retained. The evaporators have to operate at a temperature of -10F 15F (23C to 26C). Heater wires are installed along those parts of Windows, where condensation of air may collect.
Frozen food storage, as well as the Windows built-in chest and upright Cabinet styles. Fig. 14-24 shows vertical case. Since the temperature is very low in these cases, the holes are equipped with gaskets or seals. For the same reason, insulation thickness and carefully sealed. Chest types are popular because the upper holes prevent cold air leakage, when the case.
Open cases must be protected from drafts produced lattice, heaters and fans. Projects will interfere with the air curtain works. This will lead to higher operating costs and thawing of the problem. In several cases, as a rule, connected end-to-end supermarkets. Total electrical load must be carefully checked to ensure enough clothes.
The need to maintain a low temperature is a complex defrost the evaporator problem.
Evaporator should be thawed at least once a day. This should be done quickly to prevent too much warming of the case. Defrost automatically. The timer is used for the operation of the hot gas defrosting system or electric rear window heater device. Some cabinets to use two or three of air curtains.
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