Calculate the heat flow every 1.7 hours through the outside fluid film from a 16.2 m² flat vertical wall of a house, at 16.5 °C, to an ambient air temperature of 11 °C in the winter. Take the surface or convective film coefficient. h = 7 W/m²-K.
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- An average man has abody surface area of 1.8m2 and a skin temperature of 33degrees celcius .The convection heat transfer coefficient for a clothed person walking in still air is expressed as {h,8.6V^0.53}FOR 0.5<v<2m/s,where V is the walking velocityin m/s.Assuming the average surface temperature of the clothed person to be 30degrees celcius, determine the rate of heat loss from an average man walking in still air at 10degrees celcius by convectionat a walking velocity of (a)0.5m/s (b)1.0m/s (c)1.5m/s (d)2.0m/sWhat is the rate of heat loss through a 4-cm Fiberglass wall of the inside temperature is 22 °C and the outside temperature is 45 °C and windy (17 kph) ? the area of the wall is 100 square meters. Include surface films. Assume the k-value for 4-cm fiberglass is 0.056 W/m. °C and the surface air film coefficient for windy velocity (17 kph) is 0.053 for out film and the inner film Rs value is 0.093 as per the surface film coefficient tables ?b) A 0.4-W cylindrical electronic component shown in Figure Q3b with diameter 0.3 cm and length 1.8 cm is mounted on a circuit board is cooled by air flowing across it at a velocity of 150 m/min and temperature is 40 °C. Take the pressure of air 1 atm and the film temperature to be 50 °C, determine the surface temperature of the component. Resistor 0.4 W D= 0.3 cm Figure Q3b
- Refrigerant 134a flows in a 5-m long square duct that is located in a warehouse. One side of the square duct is 4 cm and surface temperature is -10 0C. Emissivity of the duct surface is 0.85. Air (ρ=1.2 kg/m3, cp=1 kJ/kgK, k=0.03 W/mK, ν=2x10-5 m2/s, Pr=0.7) at 30 0C is blown over the duct. Temperature of the warehouse walls is 60 0C. What is the required air velocity to transfer 1 kW of heat to the duct? a. 6 m/s b. 4 m/s c. 2 m/s d. 5 m/s e. 3 m/sWater at 10°C is is flowing at 0.8 m/s across a long cylinder that is made of a material that generates heat by 8.5 kW/m³. The cylinder has a diameter of 0.3 m. Thermal conductivity of the cylinder is 28 W/m.°C. Assuming the film temperature is same as the water temperature, find out the surface temperature of the cylinder. Then comment whether the assumption related to film temperature was reasonable. T₂ = 10'33 °CQ1: In a process water at 30°C flows over a plate maintained at 10 °C with a free stream velocity of 0.3 m/s. Determine the hydrodynamics boundary layer thickness, thermal boundary layer thickness, local and average values of heat transfer coefficient and refrigeration necessary to maintain the plate temperature. Consider a plate of 1m x 1m size. At the film temperature the property values are: Kinematic viscosity 1.006 x 106 m²/s, Thermal conductivity =0.5978 W/m.K, Prandtl number=7.02. =
- Water at 10°C is is flowing at 0.8 m/s across a long cylinder that is made of a material that generates heat by 8.5 kW/m³. The cylinder has a diameter of 0.3 m. Thermal conductivity of the cylinder is 28 W/m. °C. Assuming the film temperature is same as the water temperature, find out the surface temperature of the cylinder. Then comment whether the assumption related to film temperature was reasonable. Ts = 10'33 °℃A computer circuit board dissipates 0.1 KW from one side over an area 300 mm by 200 mm. A small turbo fan cools the computer with flow speed of 12 m / s. It is of utmost importance that the circuit board is kept within acceptable temperature range. Using the average Nusselt number relationship Nuav = (0.05Rez08 – 310) Pr3. You are required to calculate: (i) The surface temperature of the board for an air temperature of 30 °c. Assume: Ambient pressure of 1 bar, R = 287 J/ kg K, Cp = 1 kJ / kg K, k = 0.03 W / m K, and u = 2 x 10% kg/m sConvection 2. For a boiling process such as shown in Figure below, the ambient temperature Tin Newton's law of cooling is replaced by the saturation temperature of the fluid Tsat. Consider a situation where the heat flux from the hot plate is q=20 x 105 W/m². If the fluid is water at atmospheric pressure and the convection heat transfer coefficient is hw=20 x 103 W/m2 K, determine the upper surface temperature of the plate, Ts, w. In an effort to minimize the surface temperature, a technician proposes replacing the water with a dielectric fluid whose saturation temperature is Teat, d=52 °C. If the heat transfer coefficient associated with the dielectric fluid is h = 3 x 103 W/m2 K, will the technician's plan work?
- Engine Oil at 58.95 degrees celsius Flows over a 5m long flat plate whose temperature is 20.11 degrees celsius with a velocity of 2.2m/s. Determine the rate of heat transfer (W), considering forced convection, per unit width of the entire plate. Density = 876kg/m^3 Thermal conductivity = 0.144W/m-K Pr = 2870 dynamic viscosity = 0.21kg/m-s Q = ?3. Consider two large isothermal plates separated by 2-mm thick oil film. The upper plate moves as a constant velocity of 12 m/s, while the lower plate is stationary. Both plates are maintained at 24 °C. a. Obtain relations for the velocity and temperature distribution in the oil b. Determine the maximum temperature in the oil and the heat flux from the oil to each plate. Properties: k= 0.145 W/mK µ= 0.8374 kg/ms =0,8374 Ns/m?Water at 43.3°C flows over a large square plate at a velocity of 28 cm/s. The plate is 1.2 m long (in the flow direction) and its surface is maintained at a uniform temperature of 10.0°C. The width of the plate is 1.2 m. Calculate the steady rate of heat transfer for the entire width of the plate in watts (W). The properties of water at the film temperature of (Ts + T∞)/2 = (10 + 43.3)/2 = 27°C are ρ = 996.6 kg/m3, k = 0.610 W/m·°C, μ = 0.854 × 10–3 kg/m·s, and Pr = 5.85. The steady rate of heat transfer per unit width of the plate is ___ W.