Question

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6.(12) Your little distribution outlet in Seattle is going to install a new 4 ton (40 inches x 47 inches x 45 inches) refrigeration unit to cool your walk in freezer room. It will be installed (lifted somehow) on the roof of the building above the freezer unit. You have already braced the roof for the weight. The unit uses 410A refrigerant and has a COP of 3.4. The freezer room itself is fairly well insulated but one wall is located against the side of the building where the building gets morning sunshine. You receive ice cream five days a week, sometimes from one and sometimes from two (semi) trucks a day. Generally you keep the freezer at –15°F though that can vary. You distribute the ice cream to 7-11’s and other small outlets with your own trucks throughout the day (you have 4 small trucks). The freezer door is typically left open during busy times to ease entrance and exits but it plastic strip curtains to try and keep the cold air in. Estimate your daily electrical cost to run the new unit.

Answer 1