Cold conditioned air at 12°C is flowing inside a 1.5-cm-thick square aluminum (k = 237 W/m·K) duct of inner cross section 22 cm * 22 cm at a mass flow rate of 0.8 kg/s. The duct is exposed to air at 33°C with a combined convection-radiation heat transfer coefficient of 13 W/m2·K. The convection heat transfer coefficient at the inner surface is 75 W/m2·K. If the air temperature in the duct should not increase by more than 1°C determine the maximum length of the duct.

Q: steam exits the turbine of a steam power plant at 105 F and is to be condensed in a large condenser…

A:

Q: in to hot gases at 455°C in a fireplace with a heat transfer coefficient of 1 wood is 375°C,…

A: The Biot number is written as,Here, the Biot Number is greater than 0.1 so the Lumped system…

Q: Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 3…

A:

Q: etermine the surface tem

A: Given: Q=0.4 W d=0.3 cm L=1.8 cm v=240 m/min air temp=35oC To determine: Surface temperature

Q: 8-Consider a 0.8 m high and 1.5-m-wide double-pane window consisting of two 4-mm-thick layers of…

A: Given data as per question Double pan window, 0.8 m high and 1.5 m wide Thickness of glass layer,…

Q: Hot air leaving the stove in the kitchen of a house at 70 0C, with a square section of 22 cm x 22…

A:

Q: The upper surface of a 50-cm-thick solid brass plate (k-109 W/mK) is being cooled by water with…

A:

Q: of the collector is 100°F. The emissivity of the exposed sur- face of the collector is 0.9.…

A:

Q: ed between them. The average values of convective heat transfer coefficients at the interior and…

A: Question:- The interior of a refrigerator has inside dimensions 60 cm x 45 cm base area and 120 cm…

Q: Oil at 350 K enters a thin-Walled pipe at a mass flow rate of 0.015 kg/s and exits at 430 K . The…

A:

Q: Because you forgot to let the pipes drip during a freezing night, a section of an outdoor pipe is…

A:

Q: Oranges of 2.5-in-diameter (k= 0.26 Btu/h·ft·°F) and α= 1.4 10-6 ft2/s) initially at a uniform…

A:

Q: Liquid water flows in a circular tube at a mass flow rate of 0.006 kg/s. The water enters the tube…

A: A mass flow rate of = 0.006 kg/s.The water enters the tube at The average convection heat transfer…

Q: Determine the convection heat transfer coefficient (in W/m²-K) for air flowing at a velocity of 3…

A:

Q: Combustion gases passing through a 5-cm-internal-diameter circular tube are used to vaporize waste…

A: Given data is

Q: Consider water (at a temperature of 276 K ) flowing inside a cylindrical pipe, having a diameter of…

A:

Q: Air enters a 7-cm-diameter and 5-m-long tube at 65°C and leaves at 15°C. The tube is observed to be…

A: Given:Tube diameter, d=7 cm=0.07 mTube length, L=5 mAir inlet temperature, Ti=65oCAir exit…

Q: Answer shows Qtotal and Temperature at inner surface of window. 496W, 0.4°C Ob, 542W, 1.2°C O. 572W,…

A: Solution : Given data : Height (h)= 1.0 m                     Width (b)= 1.75 m…

Q: Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 8…

A:

Q: An 8-m long square duct with thin metal walls is hanging in a room where the temperature is 10 °C.…

A: Length of the duct, L=8 mRoom temperature, T∞=10oCAir inlet temperature, Ti=75oCoSpecific heat of…

Q: In a food industry, pieces of meat with approximately 30 cm in diameter and 20 mm in thickness are…

A: Given: The diameter of the piece of meat, d = 30 cm = 0.3 m The thickness of the piece of meat, L =…

Q: Esitmate the heat flux through a composite wall with an average conducitivity of 0.15 W/m/K and a…

A: Given Data: The thickness of the wall, t=150 mm

Q: Hot air leaving the stove in the kitchen of a house at 70 0C, with a square section of 22 cm x 22…

A:

Q: Water is to be heated from equipped with an electric outer surface of the heate transferred to the…

A: given : T₁ = 8⁰C T₂ = 80⁰C d = 3 cm = 0.03m L = 7 m V̇ = 10 L/min = 10 x10-3 m³/ 60 sec = 1.66*10-3…

Q: cylindrical fuel rod (k = 30 W/m•K) of 2 cm in diameter is encased in a concentric tube and cooled…

A: Given data is

Q: An average person body surface is approximately 2.0 m². Its skin temperature is 33°C. The convection…

A: Find convective heat transfer .

Q: A 6-m-long section of an 9-cm-diameter horizontal hot-water pipe passes through a large room whose…

A:

Q: Determine the convection heat transfer coefficient (in W/m²·K) for air flowing at a velocity of 3…

A:

Q: Consider a house that is maintained at a constanttemperature of 22°C. One of the walls of the house…

A: Given data: Height of the glass pane, h = 1.5 m Length of the glass pane, L = 1.8 m Thickness of…

Q: In a meat processing plant, 4 cm-diameter spherical meat balls (k=0.45 W/m-K and α=0.91×10-7 m²/s)…

A:

Q: Hot air leaving the stove in the kitchen of a house at 70 0C, with a square section of 22 cm x 22…

A:

Q: 400 circumferential fins of rectangular profile (k = 386 W/m °C) are installed on a tube having a…

A:

Q: Consider two flat-plate collectors with different specifications. The transmissivity, absorptivity,…

A: a) To calculate the collector efficiency, we can use the following formula:η = (τα) / [(τα) +…

Q: Consider the composite wall below. The inner side of the wall is subjected to air flow at 430°C with…

A:

Q: A circular tube (internal diameter=8 mm, length=20 m) subjected to a uniform heat flux of 30000 W/m2…

A: Given, Diameter, D=8 mm Length, L=20 mm Inlet temperature,  Ti=15°C Exit temperature,  Te=50°C…