Refrigeration Design Project Design Data 8: Parameters Design a chicken chill and sales display unit for a supermarket. The back, oor, ceiling and sides are insulated with 100 mm of polyurethane insulated cladding in aluminium sheeting. The front consists of 4 off glass doors complete with triple glassing to give customers access to the chicken store. The refrigerant is R22. The following data is provided: The chicken store is 2.8 m long X 1.75 m wide x 2.2 m high. The walls, floor and ceiling are constructed from 100-mm polyurethane insulated cladding in aluminium sheeting. The U value of the 100 mm polyurethane insulated cladding is 0.30 me2 \"C. The front consists of 4 off glass doors complete with triple glassing to give customers access to the chicken store. The U value for triple glassing is 1.65 'it'v'r'm2 E'IIZI. Doors size is 2.8 III long X 1.75 m wide X 2.2 m high. Ambient temperature outside cold room is 25 \"C, Store temperature is 0 [JC, Evaporator temperature -10 'C. Return gas from evaporator reaches the compressor with a superheat of 5 "C. Assume isentropic compression. There is no sub-cooling of the refrigeration liquid. The product in the chicken store is 2,000 kg of chickens of specic heat capacity of 3.35 kJ/kg \"C entering at 10 \"C with a cooling period of 24 hours. Make an allowance for air changes using formula in notes. (Air Entering page 13 of Refrigeration Data 2) Electrical load: Lights 250 W, Evaporator fans motors estimated at 250 W and door strip heater at 300 W. Defrost allowance of 6 hours per 24 hours, making a suitable allowance in the calculation