A house's exterior wall consists of 15 cm layer of brick (k = 0.75 W/m-°C) followed by 4 cm layer of gypsum plaster (k = 0.5 W/m-°C). What thickness of rock wool insulation (k = 0.065 W/m-°C) should be added to reduce the heat loss or gain through the wall to 25%?
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- As a designer working for a major electric appliance manufacturer, you are required to estimate the amount of fiberglass insulation packing (k = 0.035 W/m K) that is needed for a kitchen oven shown in the figure below. The fiberglass layer is to be sandwiched between a 2-mm-thick aluminum cladding plate on the outside and a 5-mm-thick stainless steel plate on the inside that forms the core of the oven. The insulation thickness is such that the outside cladding temperature does not exceed 40C when the temperature at the inside surface of the oven is 300C. Also, the air temperature in the kitchen varies from 15Cto33C, and the average heat transfer coefficient between the outer surface of the oven and air is estimated to be 12.0W/m2K. Determine the thickness of the fiberglass insulation that is required for these conditions. What would be the outer surface temperature when the inside surface of the oven is at 475C?A steam pipe (inner diameter = 150 mm and outer diameter = 160 mm) havingthermal conductivity 58 W/m. °C is covered with two layers of insulation, ofthickness 30 mm and 50 mm respectively and thermal conductivities 0.18 W/m. °Cand 0.09 W/m .°C respectively. The temperature of the inner surface of steam pipeis 320°C and that of the outer surface of the insulation layers is 40°C.Determine the quantity of heat lost per meter length of steam pipe and layercontact temperature,Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm thick, has a thermal conductivity of 0.07 W / (m K). The outer layer, 20 mm thick, has a thermal conductivity of 0.15 W / (m K). Pipes are used to delivering steam with a pressure of 600 kPa. The temperature on the outer insulation surface is 24 ° C. If the pipe is 10 m long, determine the following: (assuming that the conduction heat transfer resistance of the steel pipe and the vapor convection resistance are negligible). a. Hourly heat loss ... (kj / hr)b. temperature between insulation layers ... (° C.)
- Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm thick, has a thermal conductivity of 0.07 W / (m K). The outer layer, 20 mm thick, has a thermal conductivity of 0.15 W / (m K). Pipes are used to deliver steam with a pressure of 800 kPa. The temperature on the outer insulation surface is 24 ° C. If the pipe is 10 m long, determine the following: (assuming that the conduction heat transfer resistance of the steel pipe and the vapor convection resistance are negligible). a. Heat loss per hour. = AnswerkJ / hr. b. Temperature between insulation layers. = Answer ° C.Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm thick, has a thermal conductivity of 0.07 W / (m K). The outer layer, 20 mm thick, has a thermal conductivity of 0.15 W / (m K). Pipes are used to deliver steam with a pressure of 600 kPa. The temperature on the outer insulation surface is 24 ° C. If the pipe is 8 m long, determine the following: (assuming that the conduction heat transfer resistance of the steel pipe and the vapor convection resistance are negligible). a. Heat loss per hour. = kJ / hour. b. Temperature between insulation layers. = ° CA small storage room has the dimensions of 20 m X 20m X 3m high. The walls of the storage consist of three layers; Fiberglass (thickness = 2 cm, K = 0.1 W/mK), and Brick (thickness = 8 cm, K = Ó.5 W/mK). On one of the walls, there is one small wooden door with the dimensions of 0.9 m X 2 m and thickness of 3 cm. The thermal conductivity of wood is 0.4 W/mK. The inside temperature of the storage room is to be maintained at 20°C, while the temperature outside is 0°C. The rate of heat lost through the roof is 30 kW. Heat loss through the floor can be ignored. a) Calculate the total heat loss from the storage room (kW).
- Two walls of cold storage plant are composed of an insulating material (k = 0.25 kJ/hr-m-°C), 100mm thick at the outer layer and material (k = 3.5 kJ/hr-m-°C), 15mm thick at inner layer. If the surface temperature at the cold side is 30 °C and hot side is 250 °C, find the heat transmitted per square meter.The oven of a stove must have a sufficient insulation so that the surface temperature of the stove is not greater than 50 oC. To accomplish this, insulation, k = 0.11 W/m-K, is used between the inside and outside metal surfaces. The room temperature is 20 oC, and the outside unit convective coefficient is 8 W/m2-K. Neglecting the resistance of the metal, what is the minimum thickness of insulation required, if the outside temperature reaches 315 oC?Q1) A 6 m wide 2.8 m high wall is constructed of one layer of common brick (k = 0. 72 W/m. °C) of thickness 20 cm, one inside layer of light-weight plaster (k = 0.36 W/m. °C) of thickness 1 cm, and one outside layer of cement based covering (k = 1.4 W/m. K) of thickness 2 cm. The inner surface of the wall is maintained at 23 °C while the outer surface is exposed to outdoors at 8 °C with a combined convection and radiation heat transfer coefficient of 17 W/m2.°C. It is desired to insulate the wall in order to decrease the heat loss by 75 %. For the same inner surface temperature, determine the thickness of insulation and the outer surface temperature if the wall is insulated with polyurethane foam (k = 0.025 W/m.°C). Use thermal resistance network.
- (Q3) sk) - A 5mx7m wall consists of 3 glass windows of 1.5mx1.5m dimensions. The wall has thickness of 0.125 m and a thermal conductivity of 0.5 W/m.K. while the glass windows are 6 mm thick with a thermal conductivity of 1:24 W/mK. The values of internal and external surface conductance for the wall (including glass) are 8.1W/m2 K and 34.2 W/m² K, respectively. The internal and external temperatures are 20°C and -30°C, respectively. Calculate the total heat transfer rate through the wall. What percentage of this heat transfer is through the windows? RA composite wall layer consists of layer A covered by layer B. The thermal resistance of layer A is 0.75 °C/W and the thermal resistance of layer B is 2.50 °C/W. The exposed surface of layer A is at a temperature of 60°C. If the heat transfer per unit area across the composite wall is 30 W/m?, what is the temperature at the interface between layer A and layer B? Express your answer in °C.A steel pipe (outside diameter 100 mm) is covered with two layers of insulation. The inside layer, 40 mm thick, has a thermal conductivity of 0.07 W/(m K). The outside layer, 20 mm thick, has a thermal conductivity of 0.15 W/(m K). The pipe is used to convey steam at a pressure of 600 kPa. The outside temperature of insulation is 24°C. If the pipe is 10 m long, determine the following, assuming the resistance to conductive heat transfer in steel pipe and convective resistance on the steam side are negligible: a. The heat loss per hour. b. The interface temperature of insulation.