1-Hollow pipe with OD 12 cm, ID 10 cm ,k-35 W/mC is insulated from the inner surface with 0.5 cm thick, and k-0.015 W/mC . The outer surface is subjected to air at 30 C and h=33W/m²C, and the pipe is loaded with internal heat generator 10000W/m³. a-Calculate the maximum temperature through the pipe wall and its position. b-Draw the temperature curve on the gragh paper
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- A large home ice cream maker is being used to freeze ice cream. The bowl is at -15C, having just been removed from the freezer. If the bowl is 0.6 m in diameter, the ice cream mix fills the bowl to a depth of 0.55 m, the convective heat transfer coefficient is 220 W/m2 K, and the amount of heat transferred from the ice cream mix to the bowl is 4,300 W, what is the temperature of the ice cream mix?B: A thin rod (L-5 cm ,D=0.5 cm and k-65 W/m C) is subjected to environmental Condition of T =30C°,h=50W/m²C°. If the rod is insulated at the end part and subjected to heat source with 200C at (x=0): Calculate the heat losses from the rod and its efficiency when the Temperature at the tip is 30 C°. OA solid cylindrical uranium rod 2.54 cm dia. 1.22mlong generates heat internally at a rate of .0536 kW/cm³. It is cooled by water flowing 3 20 in a tube surrounding the rod; the water flow being 454 kg/hr entering at 15.5°C and the heat transfer coefficient is 5.11 kW/mK. The K of uranium is .032 kW/mK. Determine the maximum temperature in the rod in each of the following two cases: (a) (b) assuning no axial heat flow assuming no axial temperature variation. (A mean temperature diference assumption is necessary here).
- Q2/ The wall of a refrigerator is constructed of fiberglass insulation (k=0.035 W/ m. C) sandwiched between two layers of 1-mm-thick sheet metal (k-15.1 W/m.°C). The refrigerated space is maintained at 3°C, and the average heat transfer coefficients at the inner and outer surfaces of the wall are 4 W/m2.C and 9 W/m2.°C, respectively. The kitchen temperature averages 25°C. It is observed that condensation occurs on the outer surfaces of the refrigerator when the temperature of the outer surface drops to 20°C. Determine the minimum thickness of fiberglass insulation that needs to be used in the wall in order to avoid condensation on the outer surfaces. Sheet metal Kitchen Refrigerated air space 3°C 25°C Insulation 10°C 1 mm mmBlowtorch is used to connect the two pipes together. Length of the pipe section shown is 150 cm with an inner diameter of 85 cm. The thickness of the pipe wall is 4 mm. The conductivity of the pipe section is 167 W/m^2K. Environment has a temperature of 30 C and convective heat transfer coefficient of 28 WI(mC), find the required heat transfer to join the pipe sections at 220 C? HINT: Assume that the welding section is the base plate and the pipe is 1D extended surface (fin) symmetric about the torch melting line. Heat transfer happens by conduction along the pipe thickness in horizontal direction and by convection to the environment. Length thickness Torch melting lineThe wall of a house, 7 m wide and 6 m high is made from 0.3 m thick brick withk=0.6 W/m.K. The surface temperature on the inside of the wall is 16C and that onthe outside 6C. Find the heat flux through the wall and the total heat loss through it.
- A container used to store ice is made of wood 5.0 cm thick and has an effective area of 12,000 cm2 and thermal conductivity of 0.00027 cal/cm2-sec-°C/cm. How much ice inside the box would be melted each 24-hour day if the outside temperature is 25°C and the temperature inside the box is 5°C. COMPLETE FBD SOLUTION AND REQUIREMENTS PS. THIS IS A HEAT TRANSFER PROBLEMHow much heat is conducted through a sheet of plate glass, k=0.0024 cal/cm2-sec-°C/cm, which is 2.0 meters by 3.0 meters and 5 mm thick, when the temperatures of the surfaces are 20 and -10°C? COMPLETE FBD SOLUTION AND REQUIREMENTS PS. THIS IS A HEAT TRANSFER PROBLEMA glass container with an insulationg cover with a surface areaof (r+150) cm2 and (r+10) mm tick is filled with ice at 0 c and placed in a second vessel maintained at atemperature of (r+80)c. find the mass of the ice that melts per minute when the flow of heat becomes steady specific latent heat of ice=3.36*105 J/KG and k for glass is 1w /mk
- Question 2 Steam at 320ºC flows in a stainless steel pipe, whose inner and outer diameters are D₁ = 5 cm and Do 5.5 cm. The pipe is insulated with insulating material - glass fiber (organic bonded) at a thickness of 3 cm. Heat is lost to surroundings at 5°C via convection and radiation with a combined heat transfer coefficient of h₂ = 18 W/m²K. If the heat transfer coefficient inside the pipe is h₁ = 60 W/m²K, determine: a) the heat loss from the steam per unit length of pipe b) temperature drop across the pipe thicknessA 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) =1. A small metal building is to be constructed of corrugated steel sheet walls with a total wall surface area of about 300 m². The air conditioner consumes about 1 kW of electricity for every 4 kW of cooling supplied and two wall construction are to be compared on the basis of cooling costs. Assume that electricity costs S0.15/kWh. Determine the electrical energy savings per week of using 260 mm of fiberglass batt insulation to the steel sheet wall (U-0.17 W/m² "C) instead of 159 mm of fiberglass insulation (U-0.31 W/m² °C) assuming an overall temperature difference of 20 °C across the wall.