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The components of an electronic system dissipating 150W are located in a 1 m long horizontal...
4-79 White potatoes (k0.50 W/m-K and 0.13 X 10-6 m/s) that are initially at a uniform temperature of 25°C and have an a...
4-79 White potatoes (k0.50 W/m-K and 0.13 X 10-6 m/s) that are initially at a uniform temperature of 25°C and have an average diameter of 6 cm are to be cooled by refrigerated air at 2°C flowing at a velocity of 4 m/s. The average heat transfer coefficient between the potatoes and the air is experimentally determined to be 19 W/m2.K Determine how long t wl take for the center temperature of the potatoes to drop to 6°C. Also, determine...
Inside the chamber is a horizontal long resistor wire having a diameter of 2.5 mm. The...
Inside the chamber is a horizontal long resistor wire having a diameter of 2.5 mm. The chamber the internal surfaces have a constant temperature of 280 K and the temperature of the air inside the chamber is 300 K. The emissivity of the outer surface of the resistor is ε = 0.3 and the specific resistance R '= 2.162 Ω/ m. The resistance the maximum surface temperature must not exceed 1500 K. Calculate the current flowing through the resistor maximum...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting o...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting of two 4 mm thick layers ofglass (k-0.85 W m-K) separated by a 8-min stagnant air space. (k= 0.025 W m-K) Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner and outer surfaces on a day when the inside room temperature is maintained at 20 °C and the outside ambient temperature is 32 °C. Assume the convection...
A resistor, part of a circuit, is dissipating at 0.1 W. It is shaped like a...
A resistor, part of a circuit, is dissipating at 0.1 W. It is shaped like a cylinder with a radius of 1.8 mm and a length of 1 cm. If the air in the cabinet is at 308 K and the resistor has a heat transfer coefficient of h = 13 W/m2K for natural convection and hrad of 6.5 W/m2K, what is the resistor’s temperature? Assume heat is lost by only convection and radiation in a parallel circuit. Now if...
Natural gas is transmitted by a spherical tank with an inner radius of ri and outer...
Natural gas is transmitted by a spherical tank with an inner radius of ri and outer radius of ro. The tank material is stainless steel that has a thermal conductivity of k. The inner surface temperature is at Tw, and the outer surface dissipating heat by convection with a heat transfer coefficient h into the ambient air at temperature T∞. a) Formulate the conduction heat transfer problem. b) Develop an expression for temperature distribution T(r) within the tank material. c)...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long is made of 3.5 mm thick sheet metal that is used to deliver hot air at 60°C with an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.305, is exposed to the cold air at 10 C in the room, with a convection heat transfer coefficient of 10 W/m²....
hair dryer may be idealized as a circular duct through which a small fan draws ambient...
hair dryer may be idealized as a circular duct through which a
small fan draws ambient air and within which the air is heated as
it flows over a coiled electric resistance wire.
(1) If a dryer is designed to operate with an electric power
consumption of Pelec= 1500 W and to heat air from an ambient
temperature of Ti= 20°C to a discharge temperature of To= 45°C, at
what volumetric flow rate ∀˙ should the fan operate? Heat loss...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) i...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
2. In a production facility, thin square plates 2 mx 2 m in size coming out...
2. In a production facility, thin square plates 2 mx 2 m in size coming out of the oven at 270°C are cooled by blowing ambient air at 18°C horizontally parallel to their surfaces. Determine the air velocity above which the natural convection effects on heat transfer are less than 10 percent and thus are negligible. Answer: 10.9 m/s 2 m ti!!! Hot plates 2 m 270°C
1. Heat transfer analysis of a special-purpose panel is to be performed. The temperatures at the...
1. Heat transfer analysis of a special-purpose panel is to be performed. The temperatures at the inner and outer surfaces of the panel measure 30°C and 22°C, respectively. The dimension of the panel is 2.9 m wide, 1.3 m high and 0.40 cm thick. Its thermal conductivity is 0.13 W/m·°C. Heat is lost from the outer surface by convection and radiation. The convective heat transfer coefficient is 23 W/m2 ·°C and an ambient temperature measures 13°C. Determine (a) the fraction...
4-79 White potatoes (k0.50 W/m-K and 0.13 X 10-6 m/s) that are initially at a uniform temperature of 25°C and have an average diameter of 6 cm are to be cooled by refrigerated air at 2°C flowing at a velocity of 4 m/s. The average heat transfer coefficient between the potatoes and the air is experimentally determined to be 19 W/m2.K Determine how long t wl take for the center temperature of the potatoes to drop to 6°C. Also, determine...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting of two 4 mm thick layers ofglass (k-0.85 W m-K) separated by a 8-min stagnant air space. (k= 0.025 W m-K) Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner and outer surfaces on a day when the inside room temperature is maintained at 20 °C and the outside ambient temperature is 32 °C. Assume the convection...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long is made of 3.5 mm thick sheet metal that is used to deliver hot air at 60°C with an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.305, is exposed to the cold air at 10 C in the room, with a convection heat transfer coefficient of 10 W/m²....
hair dryer may be idealized as a circular duct through which a
small fan draws ambient air and within which the air is heated as
it flows over a coiled electric resistance wire.
(1) If a dryer is designed to operate with an electric power
consumption of Pelec= 1500 W and to heat air from an ambient
temperature of Ti= 20°C to a discharge temperature of To= 45°C, at
what volumetric flow rate ∀˙ should the fan operate? Heat loss...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
2. In a production facility, thin square plates 2 mx 2 m in size coming out of the oven at 270°C are cooled by blowing ambient air at 18°C horizontally parallel to their surfaces. Determine the air velocity above which the natural convection effects on heat transfer are less than 10 percent and thus are negligible. Answer: 10.9 m/s 2 m ti!!! Hot plates 2 m 270°C
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