A) 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%. B) Add a 1m x 1m window glass to the room. Use the data collected from previous parts. Assume the internal surroundings surfaces (e.g., walls and ceilings) have the same temperature as the inside temperature, and the external surroundings (landscape, buildings, etc.) are also at the same temperature as the outside temperature. Assume the convection coefficients between air (internal and external) and the glass are the same as the walls and the air. If the glass has an emissivity of 0.9, calculate the rate of heat loss through the glass. Assume steady-state conditions, negligible temperature gradients in the glass, and both inner and outer surfaces exposed to large surroundings. 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: Wall materials Plywood Wall/Ceiling Thickness: Cooling system Milk Casino NSW - Australia Length: 10 meters Width: 8 meters 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 Air conditioning systems FOS (Appendix B) 1.2 Target Storage Temperature Target Humidity Density Door details Lighting intensity (Appendix A) Types of lights 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). Ambient Temp 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 Cork 15-30 120-160 0.025 0.036
A) 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%. B) Add a 1m x 1m window glass to the room. Use the data collected from previous parts. Assume the internal surroundings surfaces (e.g., walls and ceilings) have the same temperature as the inside temperature, and the external surroundings (landscape, buildings, etc.) are also at the same temperature as the outside temperature. Assume the convection coefficients between air (internal and external) and the glass are the same as the walls and the air. If the glass has an emissivity of 0.9, calculate the rate of heat loss through the glass. Assume steady-state conditions, negligible temperature gradients in the glass, and both inner and outer surfaces exposed to large surroundings. 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: Wall materials Plywood Wall/Ceiling Thickness: Cooling system Milk Casino NSW - Australia Length: 10 meters Width: 8 meters 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 Air conditioning systems FOS (Appendix B) 1.2 Target Storage Temperature Target Humidity Density Door details Lighting intensity (Appendix A) Types of lights 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). Ambient Temp 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 Cork 15-30 120-160 0.025 0.036
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.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.58P: Draw the thermal circuit for heat transfer through a double-glazed or a double-paned window....
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Question

Transcribed Image Text:A) 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%.
B) Add a 1m x 1m window glass to the room. Use the data collected from previous parts.
Assume the internal surroundings surfaces (e.g., walls and ceilings) have the same
temperature as the inside temperature, and the external surroundings (landscape,
buildings, etc.) are also at the same temperature as the outside temperature. Assume
the convection coefficients between air (internal and external) and the glass are the
same as the walls and the air. If the glass has an emissivity of 0.9, calculate the rate of
heat loss through the glass. Assume steady-state conditions, negligible temperature
gradients in the glass, and both inner and outer surfaces exposed to large
surroundings.
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:
Wall materials
Plywood Wall/Ceiling Thickness:
Cooling system
Milk
Casino NSW - Australia
Length: 10 meters
Width: 8 meters
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
Air conditioning systems
FOS (Appendix B)
1.2
Target Storage Temperature
Target Humidity
Density
Door details
Lighting intensity (Appendix A)
Types of lights
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).
Ambient Temp
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
Cork
15-30
120-160
0.025
0.036
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