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- A furnace wall is to consist in series of 7 in of kaolin firebrick, 6 in of kaolin insulating brick, and sufficientfireclay brick to reduce the heat loss to 100 Btu/ hr ft2 when the face temperatures are 1500 and 100°F,respectively.a) Show the figure of the systemb) What thickness of fireclay brick should be used?c) If an effective air gap of 1/8 in can be incorporated between the fireclay and insulating brick whenerecting the wall without impairing its structural support, what thickness of insulating brick will berequired?The cooling load for a house is determined in part by using the same formulaused to find the heat load. The temperature difference used in designing acooling system is 25°F. The corner room shown does not face the sun so noadditional cooling load is required. The windows are single pane, and thewalls are brick veneer with 31⁄2 inches of insulation (R-11). The ceiling has31⁄2 inches of insulation (R-11), and the floor has no insulation. The room isbuilt over a vented crawl space with a vented attic above it. Find the coolingload for this room.You are designing a 3m x 3m floor with radiant heating. The floor has 12 parallel pex pipes (k = 40 W/mK) of L = 3m, OD = 25mm and ID = 20mm. Hot water (TInfintiy 1 = 90oC, h = 200 W/m2K) runs through the pipes continuously. The surface below the pipes is perfectly insulated. Above the pipes, there is a 3mm layer of bonding material (? = 12 W/mK) and a 9mm layer of tile (k = 2 W/mK). Above the tile, there is air (TInfinity 2 = 25oC, h = 20 W/m2K). Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), Hint: Assume that the “layer” of pipe starts at the center point (e.g. for conduction purposes, the pipe is OD divided by 2 thick). For convection, consider the entire pipe surface. a) What is the total heat rate entering the room above the floor? b) What is the temperature of the top of the tile?
- A 1 in. o.d. (outer diameter) tube reactor is insulated with a 3 inch layer of asbestos. If the temperature of the outer surface of the insulation is 100 °F and the rate of heat loss per foot of reactor length is 50 BTU/hr, what must the temperature of the inside of the reactor be? [for asbestos, k = 0.105 BTU/hr ft °F]An office space contains one (6`x 3`) well- fitted door made of nominal 2" wood. The heat loss through door by infiltration is (3381 Btuh) if Tb.l.=80 F , To= -10 F , and Vwind=15 mph ? True or falseTwo inches of urethane foam will reduce heat loss close to 1000% when applied to a 2-inch diameter uninsulated steel pipe. Assume the pipe wall thickness is 0.25-inches, the pipe interior convective heat loss (hi) is 500 BTU/hr-ft2-oF, and the pipe outside convective heat loss ho 20 BTU/hr-ft2-oF, k steel is 25 BTU/hr-ft-oF, and k insulaton is 0.023 BTU/hr-ft-oF. (hint - calculate heat loss with and without insulation.
- I need answers with clear hand writing or using Microsoft word . ASAP INTRODUCTION: for (HEAT TRANSFER THROUGH COMPOSITE WALLS) note: i want a lot of information* Runner blanket = space blanket Thin square shape material : Mylar Weight : 0.2 lbs (85g) 32 layers are thickness 0.45mm (c) assume the inside surface temperature is 35oC and the outside surface is 15oC, calculate the heat loss rate in W/m2 through the blanket. Look up thermal conductivity values for the materialsQuestion No. 12: . a) What is critical thickness of insulation? Explain its importance and derive the expression to calculate critical thickness of insulation for a cylinder. b) A composite wall consists of 2.5 cm thick Copper plate, a 3.2 cm layer of asbestos insulation and a 5 cm layer fibre plate. Thermal conductivities of the materials are respectively 355, 0.110 and 0.0489 W/m.K. The temperature difference across the composite wall is 560°C on one side and 0°C on the other side. Find the heat flow through the wall per unit area and the interface temperature between asbestos and fibre plate.
- Suppose a 3 in schedule 80 steel pipe is covered with 1 in of an insulation havingk = 60 mW/moC and the outside of the insulation is exposed to an environmenthaving h = 10 W/m2oC and Tf = 20oC. The temperature of the inside of the pipe is250oC. For unit length of the pipe calculate (a) the overall thermal resistance and(b) the heat loss (in Watts).A low carbon steel pipe with an internal diameter of 52.5 mm and a thickness of 3.8 mm that carries dry saturated steam at 20 bar is insulated with an insulator made of diatomaceous earth with a thickness of 30 mm and whose thermal conductivity is 0.1 W / (m ° C). This in turn is covered with a 65 mm thick layer of asbestos with k = 0.073 W / (m ° C). In one test the ambient temperature was 20 ° C and the asbestos surface temperature was 40 ° C. The heat transfer coefficient in the inner part of the tube was estimated as hi = 55 W / (m2 ° C). Neglect radiation losses. a) What is the heat loss per meter of pipe, in W / m? 1) 61 2) 84 3) 142 4) 575Calculate the U-value for the attic joists in the picture.Management: Ignore the post that supports the high leg.The composite layer is in the joist layer – 45×170 joists and 150 mm loose wool.The thin panel's layer can be considered an unventilated air gap 23mm, R= 0.16 m2K/W.Rsu = 0.13 m2K/W, for cold windRsi = 0.1 m2K/W, (inside) for roof Answer: 0.128 W/m2 · °C