15.21 The cross section of a storm window is shown in the sketch. How much heat will be lost through a window measuring 1.83 m by 3.66 m on a cold day when the inside and outside air temperatures are, respectively, 295 and 250 K? Convective coefficients on the inside and outside surfaces of the window are 20 and 15 W/m² K, respectively. What temperature drop will exist across each of the glass panes? What will be the average temperature of the air between the glass panes? Air space 0.8 cm wide Window glass 0.32 cm thick

Q: 6) Problem 4.7-6 (Page 350): Natural Convection Heat Loss in Double Window. 4.7-6. Natural…

A: Given that T1 =25 CT2 =10 Ch=2 mw=1.2 m Ra

Q: The inner and outer surfaces of a 0.5-cm-thick 2 m x 3 m window glass in summer are 48°C and 18°C,…

A: Given  Temperature inside wall T1 = 18 oC Temperature outside of wall T2 =48 oC Conductivity of wall…

Q: 30°C

A:

Q: Estimate the natural convection heat transfer coefficient of the horizontal pipe. The temperature of…

A: Given, Diameter of pipe, D = 15 cm×1 m100 cm    = 0.15 m temperature on outside surface of pipe, T0…

Q: rates of radiation heat transfer

A: In thermal radiation heat transfers from higher temperature  to lower temperature  without the…

Q: Consider a 0.8-m-high and 1.5-m-wide glass window with a thickness of 8 mm and a thermal…

A: Given, thermal conductivity, k = 0.78 W/m·°C Heat transfer coefficient at inside, hi = 10 W/m2·°C…

Q: 6. In a long rectangle fin, its material has thermal conductivity of 200 w/ m.K and is subjected to…

A:

Q: 2) Three materials are connected as the following figure. The heat conductivity coefficient of…

A:

Q: The inner and outer surfaces of a 0.5-cm-thick 2 m x 3 m window glass in summer are 48°C and 18°C,…

A: As per our guidelines, we are supposed to answer only 3 sub parts.

Q: A loaf of bread having a surface temperature of 373 K is being baked in an oven whose walls and the…

A: Given:  Tb=373 K Ts=477.4 K Emissivity, ε=0.85 height, h = 114.3 mm width, w =114.3 mm length, l…

Q: Heat Transfer in a Solid Using Equation of Energy Change. A solid of thickness L is at a uniform…

A:

Q: Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is…

A:

Q: An uninsulated pipe passes through a room in which the air and walls are at 30°C. The outside…

A:

Q: An aluminum bar has a diameter of 11 cm and is initially uniform in temperatureat 300◦C. If it is…

A: Lumped system analysis assumes a uniform temperature distribution throughout the body, which implies…

Q: The inner and outer surfaces of a 0.5-cm-thick 2 m x 3 m window glass in summer are 48°C and 18°C,…

A: GIVEN THAT  INSIDE TEMPERATURE T1 = 18oC Out side temperature T2 = 48oC Heat trasfer area A = 2×3…

Q: 1-128 A thin metal plate is insulated on the back and ex- posed to solar radiation on the front…

A: Given  Solar radiation incident on plate = 700 w/m2 Absorptivity of plate = 0.7 Temperature of…

Q: An opaque horizontal plate is well insulated on the edges and the lower surface. The irradiation on…

A:

Q: Estimate the natural convection heat transfer coefficient of the horizontal pipe. The outer surface…

A:

Q: Air at 20°C blows over a 50 x 75 cm hot plate made of carbon steel (AISI 1010) with 2 cm thickness.…

A:

Q: Problem 5: The energy lost from a 10 cm thick slab of steel is 50 W. Assuming the temperature…

A: Thick Ness of slab t = 10 cm                                  = 0.1 mThermal conductivity k = 45 W/…

Q: A harizantal tube carrying hat water has a surface temperature of 355.4 K and an outside diameter of…

A: Given data: Surface temperature of pipe = 355.4 K Outside diameter of pipe = 25.4 mm Room…

Q: A loaf of bread having a surface temperature of 373 K is being baked in an oven whose walls and the…

A: given Temperature of body Tb=373 K Temperature of the surrounding Ts=477.4 K Emissivity e=0.85…

Q: Problem 1 A concrete wall (plane wall) of 20-cm-thick, is subjected to convection on both sides. In…

A:

Q: For the plane wall shown, solve the conduction equation, deriving an algebraic expression for the…

A: Conduction is a simple heat transfer process in which heat transfers from one end to another end of…

Q: b) A heated sphere of radius R is placed in a large amount of stagnant fluid. Consider the heat…

A: Given:The temperature at the share is constant,So, at r=R, T=TR, and throughout the liquid it…

Q: An opaque horizontal plate is well insulated on the edges and the lower surface. The irradiation on…

A:

Q: Calculate the heat loss from a double-pane glass window consisting of two pieces af glass, each…

A: Given: The window is made up of a glass of thickness i.e. L1 = L2 = 10 mm or 0.01 m each and in the…

Q: The heat transfer rate from hot air by convection at 100°C flowing over one side of a flat plate…

A: This problem involves the heat transfer by convection over a flat plate. The dimensions given are =…

Q: Consider a 0.8-m-high and 1.5-m-wide double-pane window consisting of two 4-mm-thick layers of glass…

A: Heat transfer in general describes the process by which heat is flow from higher temperature to…

Q: coefficient (h). Dreive the critical insulation thickness and explaine the effect of re on the rate…

A:

Q: Steam is being transported in a pipe Outer diameter of the pipe is 8 cm, and the surrounding air…

A: (a) The rate of heat transfer from the pipe to the surroundings is to be determined.

Q: Q2: An electrical hot plate that work ona 800W heater iron plate is exposed to the air at 20°C. The…

A: Given Heat transferred through the electrical hot plate=800 W temp of air=20o C=293 K emissivity of…

Q: Estimate the natural convection heat transfer coefficient of the horizontal pipe. The outer surface…

A: For heat transfer from a horizontal pipe by convection process, the correlation given by Churchill…