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- Heat is being generated within a 6 m long stainless steel cylinder with the amount of 2kW. The thermalconductivity of the cylinder is constant at 15.1 W/moC. The temperature and the heat transfercoefficient of the environment are 30oC and 140 W/m2 respectively and the heat is transferred insteady state. Determine the cylinder surface temperature a) by using the applicable relation, and b)by using differential equation and solving it.Q: A large plane wall of thickness (L= 0.3 m), thermal conductivity (k = 40 W/m-°C), and surface area 0.4 m2. The left side of the wall is maintained at a constant temperature of 70°C while the right side loses heat to the surrounding air with heat flux q' expressed by: 1200k q = k+20L A- Find a relation to determine the variation of temperature in the wall. B- Determine the rate of heat transfer through the wall. C- Determine the temperature at the right side of the wall. wall T1= 70 °C L= 0.3ma. The wall of a building has a surface area of 50 m2. The outside layer of the wall is 20 cm thick concrete with thermal conductivity kcon = .8 W/m-K. The inner layer is 10 cm thick balsa wood (kbalsa = .048 W/m-K) as an insulator. Outside temperatures of 47o C are expected, while an inside temperature of 21o C is maintained by the cooling system. Find the rate of heat transfer through the wall.
- 0/1 The thermal conductivity of Aluminum material at127°Cand 527 C are 240 and 218 W/m. K, respectively. Determine ko and B, constants for the used material. k=ko (1 + BT) is assumed with T in °C. 0/2 Heat is generated in a slab of 120 mm thickness with a conductivity of 200 W/m K at a rate of 106W/m. Determine the temperature at the mid and quarter planes if the surface of the solid on both sides are exposed to convection at 30°C with a convection coefficient of 500 W/m K. Also find the heat flow rate at these planes and the temperature gradients at these planes. 0/3 1. Determine the heat flow for (i) rectangular fins and (ii) triangular fin of 20 mm length and 3 mm base thickness. Thermal conductivity = 45 W/m K. Conwection coefficient h= 100 W/m K, base temperature = 120°C surrounding fluid temperature = 35°C. Determine also the fin effectiveness. 2. A circumferential fin on a pipe of 50 mm OD is 3 mm thick and 20 mm long. Using the property values and other parameters in 1,…pls answer:The temperature at the inner and outer surfaces of a boiler wall made of 20 mm thick steel and covered with an insulating material of5 mm thickness are 300 C and 50 C respectively. If the thermal conductivities of steel and insulating material are 58W/m.C and 0.116W/m.C respectively, determine the heat flux through the boiler wall in W/m2.The internal side of a wall is kept at 100o C and its external side which is exposed to the surrounding is kept at 10oC. The heat transfer convective coefficient of the surrounding is 10 W/m2oC. The wall conductivity coefficient is 1.3 W/mo C and its thickness is 0.4 m. What is the heat transfer through the wall?
- A rectangular wall of length "L" m and height "H" m is made from a thick bricklayer. The rectangular wall has a surface area as 11 m2 & Thermal conductivity as 0.53 W/mK. The wall is subjected to heat transfer due to the outside temperature 43 °C and inside temperature 24 °C. If the energy loss is 11219 kJ in 484 minutes. (HINT: 1 minute = 60 %3D seconds) Determine the following -- i) Heat transfer rate, ii) Thickness of the wall.A 2m^2 wall of 1010steel is 8 mm thick. If the outside of the wall is100 °C, andyou measure aheat flux of 80 kW/m2coming off the wall, what is the temperature of the insideof thewall?A wall of length "L" m and height "H" m is made from a thick bricklayer of 38 cm with thermal conductivity of 0.57 W/mK is subjected to heat transfer due to the outside temperature as 35 oC and inside temperature 28 oC. If the energy loss is 10465 kJ in 11 hours. Determine the Heat transfer rate, Surface Area and Length and Height of the wall, if L = 3.5 H. Solution: i) Heat Transfer Rate (in Joule/Sec) = ii) Surface Area of the Wall (in m2) = iii) Height of the Wall (H in m) = iv) Length of the Wall (L in m) =
- 2. A steel plate of k=50W/mK and thickness 10cm passes a heat flux by conduction of 25kW/m2. If the temperature of hot surface of plate is 100 C, then what is the temperature of the cooler side of plate? 1. 30 C 2. 40 C 3. 50 C 4. 60 CQ4-A furnace of 100 x 80 60-cm inside dimensions is constructed of a material having a thermal conductivity of 2.4 W/mK. The wall thickness is 10-cm. The inner surface temperatures is 1000 K and the outer environment is at 20C and 15 /m2C as a convection heat transfer coefficient. Determine the overall heat transfer coefficient based on one-dimension heat conduction analysis. Calculate the heat loss through the furnace wall.In the walls of a warehouse, the inner plaster thickness is 2 cm and the heat conduction coefficient is 0.60 W / moC, the curtain concrete thickness is 10 cm, the heat conduction coefficient is 1.3 W / moC, the outer plaster is 2.5 cm and the heat conduction coefficient is 1.2 W. It is known to be / moC. Inner surface heat transfer coefficient is 8 W / m2oC and outer surface heat transfer coefficient is 21 W / m2oC. Indoor temperature, outdoor temperature and relative humidity of indoor environment are given in the table. How much of the insulation material with thermal conductivity coefficient should be used between the gas concrete and the outer plaster in order to prevent condensation on the inner wall of this warehouse. The indoor and outdoor ambient temperatures of the warehouse and the relative humidity of the storage environment are given in the table.K insulation: 0.032T inner: 14T outside: -15Relative humidity: 60