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(a) Find the refrigeration capacity if no insulation is used for the walls and ceiling. (b) Select insulation(s) for the wall and ceiling to reduce the refrigeration capacity. Evaluate the thickness required for the insulation you selected to reduce the refrigeration load by approximately 30%. Note: The convection heat transfer coefficients for internal and external surfaces are 8 W/m2 K and 30 W/ m2 K, respectively. Technical Specifications Document - Dairy Storage Room Material to be Stored Location Storage Room Dimensions: Milk Casino NSW - Australia Length: 10 meters Width: 8 meters Wall materials Plywood Wall/Ceiling Thickness: Cooling system Air conditioning systems FOS (Appendix B) Target Storage Temperature Target Humidity Density Door details Lighting intensity (Appendix A) Types of lights Ambient Temp Height: 3 meters Three-layer walls and ceiling are constructed using 1 x layer of plywood and 2 x layers of plasterboard. The middle layer is plywood with an additional 10mm thick plasterboard on both sides, adding 20mm to the overall wall thickness. Plywood Walls: 120 millimetres Plywood Ceiling: 150 millimetres Shifting ammonia between gas and liquid using pressure (Chilled air is -22°C; chilled water is 0.2°C -0.5°C, cooling plates -25°C.) Condenser unit with a Fan blower 1.2 Milk storage silos are kept within 1°C to 4°C 85-95% RH 1032.7 (kg/m³) 2m x 2m x 60mm thick hardwood 700 lux Fluorescent lights, with a luminous efficacy of 100 lumens per watt (Im/W). 35°C Properties of materials Material Density (kg/m³) Thermal conductance K Hardwood 720 0.16 Plywood 454 0.12 Plaster board 800 0.17 Properties of insulation materials Material Density (kg/m³) Thermal conductance K Polyurethane panel 30-32 0.015 Thermocol 15-30 0.025 Cork 120-160 0.036

(a) Find the refrigeration capacity if no insulation is used for the walls and ceiling. (b) Select insulation(s) for the wall and ceiling to reduce the refrigeration capacity. Evaluate the thickness required for the insulation you selected to reduce the refrigeration load by approximately 30%. Note: The convection heat transfer coefficients for internal and external surfaces are 8 W/m2 K and 30 W/ m2 K, respectively. Technical Specifications Document - Dairy Storage Room Material to be Stored Location Storage Room Dimensions: Milk Casino NSW - Australia Length: 10 meters Width: 8 meters Wall materials Plywood Wall/Ceiling Thickness: Cooling system Air conditioning systems FOS (Appendix B) Target Storage Temperature Target Humidity Density Door details Lighting intensity (Appendix A) Types of lights Ambient Temp Height: 3 meters Three-layer walls and ceiling are constructed using 1 x layer of plywood and 2 x layers of plasterboard. The middle layer is plywood with an additional 10mm thick plasterboard on both sides, adding 20mm to the overall wall thickness. Plywood Walls: 120 millimetres Plywood Ceiling: 150 millimetres Shifting ammonia between gas and liquid using pressure (Chilled air is -22°C; chilled water is 0.2°C -0.5°C, cooling plates -25°C.) Condenser unit with a Fan blower 1.2 Milk storage silos are kept within 1°C to 4°C 85-95% RH 1032.7 (kg/m³) 2m x 2m x 60mm thick hardwood 700 lux Fluorescent lights, with a luminous efficacy of 100 lumens per watt (Im/W). 35°C Properties of materials Material Density (kg/m³) Thermal conductance K Hardwood 720 0.16 Plywood 454 0.12 Plaster board 800 0.17 Properties of insulation materials Material Density (kg/m³) Thermal conductance K Polyurethane panel 30-32 0.015 Thermocol 15-30 0.025 Cork 120-160 0.036

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.30P: 2.30 An electrical heater capable of generating 10,000 W is to be designed. The heating element is...
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(a) Find the refrigeration capacity if no insulation is used for the walls and ceiling. (b) Select insulation(s) for the wall and ceiling to reduce the refrigeration capacity. Evaluate the thickness required for the insulation you selected to reduce the refrigeration load by approximately 30%. Note: The convection heat transfer coefficients for internal and external surfaces are 8 W/m2 K and 30 W/ m2 K, respectively. Technical Specifications Document - Dairy Storage Room Material to be Stored Location Storage Room Dimensions: Milk Casino NSW - Australia Length: 10 meters Width: 8 meters Wall materials Plywood Wall/Ceiling Thickness: Cooling system Air conditioning systems FOS (Appendix B) Target Storage Temperature Target Humidity Density Door details Lighting intensity (Appendix A) Types of lights Ambient Temp Height: 3 meters Three-layer walls and ceiling are constructed using 1 x layer of plywood and 2 x layers of plasterboard. The middle layer is plywood with an additional 10mm thick plasterboard on both sides, adding 20mm to the overall wall thickness. Plywood Walls: 120 millimetres Plywood Ceiling: 150 millimetres Shifting ammonia between gas and liquid using pressure (Chilled air is -22°C; chilled water is 0.2°C -0.5°C, cooling plates -25°C.) Condenser unit with a Fan blower 1.2 Milk storage silos are kept within 1°C to 4°C 85-95% RH 1032.7 (kg/m³) 2m x 2m x 60mm thick hardwood 700 lux Fluorescent lights, with a luminous efficacy of 100 lumens per watt (Im/W). 35°C Properties of materials Material Density (kg/m³) Thermal conductance K Hardwood 720 0.16 Plywood 454 0.12 Plaster board 800 0.17 Properties of insulation materials Material Density (kg/m³) Thermal conductance K Polyurethane panel 30-32 0.015 Thermocol 15-30 0.025 Cork 120-160 0.036
Transcribed Image Text:(a) Find the refrigeration capacity if no insulation is used for the walls and ceiling. (b) Select insulation(s) for the wall and ceiling to reduce the refrigeration capacity. Evaluate the thickness required for the insulation you selected to reduce the refrigeration load by approximately 30%. Note: The convection heat transfer coefficients for internal and external surfaces are 8 W/m2 K and 30 W/ m2 K, respectively. Technical Specifications Document - Dairy Storage Room Material to be Stored Location Storage Room Dimensions: Milk Casino NSW - Australia Length: 10 meters Width: 8 meters Wall materials Plywood Wall/Ceiling Thickness: Cooling system Air conditioning systems FOS (Appendix B) Target Storage Temperature Target Humidity Density Door details Lighting intensity (Appendix A) Types of lights Ambient Temp Height: 3 meters Three-layer walls and ceiling are constructed using 1 x layer of plywood and 2 x layers of plasterboard. The middle layer is plywood with an additional 10mm thick plasterboard on both sides, adding 20mm to the overall wall thickness. Plywood Walls: 120 millimetres Plywood Ceiling: 150 millimetres Shifting ammonia between gas and liquid using pressure (Chilled air is -22°C; chilled water is 0.2°C -0.5°C, cooling plates -25°C.) Condenser unit with a Fan blower 1.2 Milk storage silos are kept within 1°C to 4°C 85-95% RH 1032.7 (kg/m³) 2m x 2m x 60mm thick hardwood 700 lux Fluorescent lights, with a luminous efficacy of 100 lumens per watt (Im/W). 35°C Properties of materials Material Density (kg/m³) Thermal conductance K Hardwood 720 0.16 Plywood 454 0.12 Plaster board 800 0.17 Properties of insulation materials Material Density (kg/m³) Thermal conductance K Polyurethane panel 30-32 0.015 Thermocol 15-30 0.025 Cork 120-160 0.036
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