Air at 20°C blows over a hot plate 50 by 75 cm maintained at 250°C. The convection heat-transfer coefficient is 25 W/m². °C. Calculate the heat transfer.
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- Water is entering a heated tube at mass ow rate of 1.2 kg/s. The temperature at the inlet is 20 C and at the outlet is 80 C. Assume the surface temperature of the tube is 100 C. The convection coe cient of the water ow is 28 W=m2 C. The speci c heat and density of water can be assumed to be 4180 J=kg C and 990 kg=m3. What is the rate of heat transfer to water during this procesFluid flows over a plane surface 1m by 1m with a bulk temperature of 50 °C.The temperature of the surface is 20°C. The convective heat transfercoefficient is 2000 W/m²°C.Assuming Air at 20°C blows over hot plates 50 by 75 cm maintained at 250 °C, (h = 25 W/m². C), and that 300 W is lost from the plate surface by radiation. That the plate is made of carbon steel (1%) 2 cm thick (k=43 W/m.°C), temperature inside plates is 254°C. How much heat is transferred through the plate?
- How much air is used per kg of coal burnt in a boiler havinga chimney of 35 m height to create draft of 20 mm of water, when the temperature of the flue gases in the chimney is 370°C and the temperature of the boiler house is 34°C? Take volume of 1 kg of air NTP as 0.7734 m3.Hot air at 80°C is blown over a 2m x 4m flat surface at 30°C. If the average convection heat transfer coefficient is 55 W/m2 °C, determine the rate of heat transfer from the air to the plate, in kW. OA. 32.93 kW OB. 26.50 kW OC. 22.88 kW O D. 17.96 kW H Type here to search In E H (99+ 6 п в с б TConsider a 120 mm stainless steel plate (K=45w/m.°C, p=7800kg/m2, CP3500J/kg. °C) initially at a uniform temperature of 300° stainless steel plate is immersed in a fluid at temperature Tc0 = 1000 °C and is subjected to convection heat transfer from both sides with a convection coefficient of h=225W/m2.°C. The surface temperature in(°C) after 8 minutes of cooling is O 518.8 O 643.3 O 495 O 600
- QI/The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8 m long. The top surface is absorbing solar radiation at a rate of 200 W/m2, and the temperature of the ambient air is 30°C. Assuming the roof of the car to be perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection, determine the equilibrium temperature of the top surface of the car. Ans =35.1 cQ4/The outside wall of a building 6 m high receives an average radiant heat flux from the sun of 1100 W/m². Assuming that 95 W/m² is conducted through the wall, estimate the outside wall temperature. Assume the atmospheric air on the outside of the building is at 20°C. Ans. 170°CConvection heat transfer from a plate (2 m x 2 m) is 450 W. If surface temperature of plate is 450 K and surrounding temperature is 300 K, what will be value of heat transfer coefficient?
- Q1) 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 hydrodynamic boundary layer thickness, thermal boundary layer thickness, local and average values of friction coefficient, heat transfer coefficient and refrigeration necessary to maintain the plate temperature. Also find the values of displacement and momentum thicknesses. Consider a plate of 1 mx 1 m size.Air at 20-C blows over a hot plate 50 by 75 cm maintained at 250-C. The convection heat- transfer coefficient is 25 W/m2 - •C. Calculate the heat transfer.A plaster wall which is 20 cm thick with a thermal conductivity of 0.3W/m2 C is used in a certain house. The inner wall temperature is at 40C, and the outer wall is exposed to ambient wind and the surroundings at 12C. The film coefficient, h, for convective heat transfer in a 10m/s wind is about 21W/m2C. Ignoring any radiation losses, find the overall coefficient for the conduction and convection losses in W/m2 C О а. 1 O b. 10.1 О с. 1.4 O d. 8.1