A 4-m-high and 6-m-wide wall consists of a long18-cm * 30-cm cross section of horizontal bricks (k =0.72 W/m·K) separated by 3-cm-thick plaster layers (k =0.22 W/m·K). There are also 2-cm-thick plaster layers on eachside of the wall, and a 2-cm-thick rigid foam (k = 0.026 W/m·K)on the inner side of the wall. The indoor and the outdoor temperaturesare 22°C and 24°C, and the convection heat transfercoefficients on the inner and the outer sides are h1 = 10 W/m2·Kand h2 = 20 W/m2·K, respectively. Assuming one-dimensionalheat transfer and disregarding radiation, determine the rate ofheat transfer through the wall.

Q: Question 2.2 Two 3 m long and 0.4 cm thick cast iron (k= 52 W/m-K) steam pipes, of outer diameter 10…

A: Given data

Q: On a multi-layered square wall, the thermal resistance of the first layer is 0.005 ° C / W, the…

A: The thermal resistance of first layer is R1=0.005°C/W. The thermal resistance of second layer is…

Q: there are times when contact resistance between two surfaces is so small compared to the overall…

A: Given that there are times when contact resistance between two surfaces is so small compared to the…

Q: Clothing made of several thin layers of fabric with trapped air in between, often called ski…

A: Consider the thermal circuit shown below for the 5 layered jacket. Here, The total resistance for…

Q: Problem (4): solve of the following problem. A circular cross-section area metallic bar (k=85…

A: Write the given data: D=0.025 mL=0.1 mw=0.1 mTb=100°CT∞=20°Ch=25 W/m2°Ck=85 W/m °C

Q: 03-As shown in the figure, four circumferential fins of aluminum rectangular profile are installed…

A:

Q: Consider a cylindrical steel pipe of an inner radius of 2.9m, an outer radius of 3.2m, and thermal…

A: Given A cylindrical steel pipeinner radius (r1)=2.9 mouter radius (r2)=3.2 mThermal conductivity…

Q: A 4-m-high and 6-m-wide wall consists of a long 18-cm x 30-cm cross section of horizontal bricks (k…

A: Given, The height of the wall, H=4 m The width of the wall, W=6 m Thermal conductivity of brick,…

Q: Convective heat transfer coefficient is 15 W/(m*K), surface area of the fin is 2 m^2, the…

A: Given Data The Convective heat transfer coefficient, h= 15 W/(m*K) The surface area of the fin, A= 2…

Q: A 15 mm diameter cylindrical nuclear fuel rod is housed in a hollow ceramic cylinder concentric to…

A:

Q: A 2 cm thick steel pipe (thermal conductivity 43 W/[m °C]) with 6 cm inside diameter is being used…

A:

Q: based on the information given here. Steam in a heating system flows through tubes whose outer…

A: Given                      Surface area, A = 0.001916 m2       Thermal conductivity, k = 186 W/ moC…

Q: Inconel refers to a class of nickel-chromium-based superalloys that are used in high-temperature…

A:

Q: On a multi-layered square wall, the thermal resistance of the first layer is 0.005 ° C / W, the…

A:

Q: On a multi-layered rectangular wall, the thermal resistance of the first layer is 0.005 ° C / W, the…

A:

Q: A 10-in-thick, 30-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k…

A: Given data as per the question wall thickness = 10 in length of wall = 30 ft plaster layer thickness…

Q: A 4-m-high and 6-m-wide wall consists of a long 15-cm × 25-cm cross section of horizontal bricks (k=…

A:

Q: Define the following items. 1- Radiation shape factor. 2- Overall heat transfer coefficient. 3-…

A: (1) Radiation shape factor:  It can be understand as the fraction of the radiation energy that falls…

Q: The room of a dwelling receives energy from the sun during the day. The roof temperature becomes too…

A: Given Data  Roof temperature, TR= 65°C Ambient temperature, Ta=20°C Length of the roof, L=5m

Q: Steam at 230°C is flowing through a steel pipe (k = 15W/m °C) whose inner and outer diameters are 90…

A:

Q: A transformer that is 10 cm long, 6.2 cm wide, and 5 cm high is to be cooled by attaching a 10…

A:

Q: A 10-in-thick, 40-ft-long, and 20-ft-high wall is to be constructed using 9-in-long solid bricks (k…

A:

Q: A 4-m-high and 6-m-wide wall consists of a long 18-cm x 30-cm cross section of horizontal bricks (k=…

A:

Q: A 10-in-thick, 26-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k=…

A:

Q: The walls of a food storage facility are made of a 2-cm-thick layer of wood (k =0.1 W/m-K) in…

A:

Q: Esitmate the heat flux through a composite wall with an average conducitivity of 0.15 W/m/K and a…

A: Given Data: The thickness of the wall, t=150 mm

Q: Required information A 16-m x 8.5-m section of wall of an industrial furnace burning natural gas is…

A: Given data as per question Temperature of surface room=300cTemperature of outer surface of this…

Q: It is required to insulate a kitchen oven with cork board (k = 0.043 W/mK) so that the heat losses…

A: Given Data :  Thermal Conductivity k = 0.043 W/mK Heat loss Q = 400 W/m2 Inner temperature Ti = 225…

Q: A 15 mm diameter cylindrical nuclear fuel rod is housed in a hollow ceramic cylinder concentric to…

A: Given   Radius, r1 = 7.5 mm                r2 = 17.5 mm                r3 = 55 mm Heat transfer…

Q: fer coefficient

A: Given   Radius, r1 = 7.5 mm                r2 = 17.5 mm                r3 = 55 mm The Heat transfer…

Q: A transformer that is 10 cm long, 6.2 cm wide, and 5 cm high is to be cooled by attaching a 10…

A:

Q: A 15 mm diameter cylindrical nuclear fuel rod is housed in a hollow ceramic cylinder concentric to…

A: Basics of heat transfer: Conduction - occurs in the solid elements which are in contact with one…

Q: Foam Plaster A 4-m-high and 6-m-wide wall consists of a long 18-cm x 30-cm cross section of…

A: Thermal conductivity is the measure of the capability of an object to conduct or transfer heat. It a…

Q: 2.33 One end of a 0.3-m-long steel rod is connected to a wall at 204°C. The other end is connected…

A: Data given-  T1 = 204°C  T2 = 93°C  h = 17 W/m2 K  Tair = 38°C  L = 0.3 m  D= 5 cm = 0.05 m

Q: A 10-in-thick, 26-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k…

A: Given Thickness = 10 in Long = 26 ft Highest = 10 ft Brick length = 9 in k = 0.40 BTU/ h F Cross…

Q: The 5-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m-K) or copper…

A:

Q: Two pin fins are identical, except that the diameter of one of them is twice the diameter of the…

A: (a) The effectiveness of a fin can be expressed as, The ratio of effectiveness can be calculated…

Q: 2. A hot surface at 100°C is to be cooled by attaching 3-cm-long, 0.25-cm-diameter aluminium pin…

A:

Q: A wall consists of a long 18-cm x 30-cm cross section of horizontal bricks (k = 0.72 W/m · °C)…

A:

Q: tion heat transfer coefficients on the inner and the outer sides are h1 = 12 W/m2 · °C and h2 = 20…

A: Given:

Q: A 12-m-long and 5-m-high wall is constructed of two layers of 1-cm-thick sheetrock (k = 0.17 W/m·K)…

A: Given Data: The dimension of the wall is: 12m X 5 m The thermal conductivity of wood stud is: h…

Q: A 12 m long and 5 m high wall is constructed of two layers of 1 cm thick sheetrock (& = 0.17 W/m.…

A:

Q: Composite walls of a building are made of 8 cm of brick [k = 0.69 W/m·°C], 2 cm of Celotex [k =…

A:

Q: QUESTION 1 A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1…

A:

Q: 2) Urethane (k = 0.026 W/m-K) is used to insulate the sidewall and the top and bottom of a…

A: Given data as per question thermal conductivity of urethane(k)=0.026 wmkthickness=40mm=0.04 mheight…

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.