Water is heated by submerging 50 mm-diameter, thin-walled copper tubes in a tank and passing hot combustion gases (Tg=750 K) through the tubes. To enhance heat transfer to the water, four straight fins of uniform cross section, which form a cross, are inserted in each tube. The fins are 5 mm thick and are also made of copper (k = 400 W/m K). If the tube surface temperature is T = 350 K and the mass flow rate of gas = 1.1 kg/s. What is the overall efficiency of the fins? Treat gas as air. D-50 mn -T,- 350 K Wabr -Fins (-5 mm) Gases Tube wall

Q: Saturated refrigerant 134a flows in the evaporator tube at 2 °C. The evaporator is made of thin…

A: Write the given data with suitable variables. T°=2 °Cd=1 cm=0.01 mD=2.5 cm=0.25 mT∞=25 °Ch=40…

Q: Consider a copper tube with domestic hot water flowing inside (Tin =70◦C, um = 0.5m/s). The inner…

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Q: A round copper rod sticks through the thin, insulated wall of a tank of hot water and into the air…

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Q: Consider a pipe-pipe configuration consisting of concentric steel tubes with an intervening…

A: Given Di1=150mmti=to=10mmDi2=250 mmho=500 W/m2Kks=35 W/mKkp=0.075W/mKhi=450 W/m2K

Q: Write your answer in 4 decimal places. DO NOT round off intermediate values. Water (Cp = 4180…

A: Given Data Cp= 4180 J/kgK D=4 cm Twi=15°C Two=45°C q=2500 W/m2

Q: 2- A- Water is to be heated from 15°C to 65°C as it flows through a 3-cm-internal-diameter 5-m-long…

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Q: Saturated refrigerant 134a flows in the evaporator tube at 2 °C. The evaporator is made of thin…

A: Write the given data with suitable variables. T°=2 °Cd=1 cm=0.01 mD=2.5 cm=0.025 mT∞=25 °Ch=40…

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Q: Calculate the total thermal resistance between hot water and the surrounding ambient air for the…

A: Write the given data. L=10 mvair=0.6 m/svwater=0.05 m/shw=118 W/m2KTb=50 °Cki=0.5 W/mKkc=18…

Q: Steam exiting the turbine of a steam power plant at 90°C is to be condensed in a large condenser by…

A: Assumptions:Steady-state heat transfer (constant rate of heat transfer)One-dimensional heat transfer…

Q: A 15-cm-diameter horizontal cylinder has a surface temperature that is maintained at 120°C. Water at…

A: Given:Diameter of a cylinder, D=15 cm=0.15 mSurface temperature of the cylinder, Ts=120oCWater…

Q: A fluid is flowing through two different tubes of same cross-section area. We are to compare the…

A: Given: The length of the circular pipe and square pipe is same. Heat transfer is calculated as:…

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: SITUATIONAL PROBLEM I: A composite wall constructed of 2.5 cm of steel (k= 60.5 W/m-K) and 5.0cm of…

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Q: To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

Q: Heat Transfer Lesson The temperature will be increased from 10 (Degree Celsius oC) to 90 (Degree…

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Q: Thermodynamics problem. A membrane type electrical heater of 20,000 w/m? capacity is sandwiched…

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.