Consider the wind turbine of Example 1.3. To reduce thenacelle temperature to
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Fundamentals of Heat and Mass Transfer
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- An ideal gas passes a diffuser. At the diffuser inlet, the temperature is T1 = 350.00 K, the pressure P1 = 100.00 kPa, the velocity V1 = 200.00 m/s, and the inlet area A1 = 0.30 m2. At the exit, the velocity is very small. The specific heat of the ideal gas at the constant pressure is cp = 1.0050 kJ/(kg·K). The gas constant is R = 0.2870 kPa·m3/(kg·K). Determine the enthalpy per unit mass at the inlet, h1__________(kJ/kg)arrow_forwardAn ideal gas passes a diffuser. At the diffuser inlet, the temperature is T1 = 350.00 K, the pressure P1 = 100.00 kPa, the velocity V1 = 200.00 m/s, and the inlet area A1 = 0.30 m2. At the exit, the velocity is very small. The specific heat of the ideal gas at the constant pressure is cp = 1.0050 kJ/(kg·K). The gas constant is R = 0.2870 kPa·m3/(kg·K). Determine the temperature at the exit, T2__________(K)arrow_forwardYou are provided a horizontal tube with one entrance and one exit. Air (Cp = 1.005 kJ/(kg-K)) is passing through the pipe and is assumed ideal. The inlet conditions are 102 psia, 101 degrees Fahrenheit and velocity 9feet/second. Determine the outlet velocity (ft/s) and outlet temperature (degrees Fahrenheit) if the exit conditions are 2.1 psia. Assume the process occurs under adiabatic conditionsarrow_forward
- One type of supersonic wind tunnel is a blow-down tunnel, where air is stored in a high-pressure reservoir, and then, upon the opening of a valve, exhausted through the tunnel into a vacuum tank or simply into the open atmosphere at the downstream end of the tunnel. For this example, weconsider just the high-pressure reservoir as a storage tank that is being charged with air by a high-pressure pump. As air is being pumped into the constant-volume reservoir, the air pressure inside the reservoir increases. The pump continues to charge the reservoir until the desired pressure is achieved.Consider a reservoir with an internal volume of 30 m3. As air is pumped into the reservoir, the air pressure inside the reservoir continually increases with time. Consider the instant during the charging process when the reservoir pressure is 10 atm. Assume the air temperature inside the reservoir is held constant at 300 K by means of a heat exchanger.Air is pumped into the reservoir at the rate of 1…arrow_forwardYou are provided a horizontal tube with one entrance and one exit. Air (Cp = 1.005 kJ/(kg-K)) is passing through the pipe and is assumed ideal. The inlet conditions are 102 psia, 101 degrees Fahrenheit and velocity 9 feet/second. Determine the outlet velocity (ft/s) and outlet temperature (degrees Fahrenheit) if the exit conditions are 2.1 psia. Assume the process occurs under adiabatic conditions. Write all the assumptions you made in solving the problem.arrow_forwardAnswer completely. The Fanning equation is essentially the same as the Darcy-Weisbach equation but differs by their friction factors. What is the relationship between the friction factor, f, of the Darcy-Weisbach equation and the friction factor, f’, of the Fanning equation?arrow_forward
- Q1: Air enters a 7m long section of a rectangular duct of cross section 15 cm x 20 cm at 50°C at an average velocity of 7 m/s. If the walls of the duct are maintained at 10 C, determine (a) the outlet temperature of the air, (b) the rate of heat transfer from the air. Air properties from tables: p=1.127 kg/m' C,-1007 J/kg. C k 0.02662 W/m.°C Pr 0.7255 D=1.702x10 m'/s Answer: (a): Te 34.2 °C, (b): Q' 3776 W Hint: 1- Use the Logarithmic mean temperature difference relations. If Reer 2300, in pipes and ducts, the flow is turbulent. T-10°C Air duet 15 em x 20 em Air 50°C 7 m/s L-7marrow_forwardThe pressure of steam 400 C and u = 2949 kJ/kg is most nearlyarrow_forwardA small petrol engine produces 15 KW of power under the following conditions;Fuel intake 0.05 kg/minCalorific value of fuel 40000 KJ/kgAir intake for combustion 0.70 kg/minSpecific air enthalpy 300 kJ/kgHeat loss from the engineBy radiation and convection 2700 KJ/hrDetermine the specific enthalpy of the exhaust gases from the engine.arrow_forward
- H.W. Q1: Air enters a 7m long section of a rectangular duct of cross section 15 cm x 20 cm at 50°C at an average velocity of 7 m/s. If the walls of the duct are maintained at 10°C, determine (a) the outlet temperature of the air, (b) the rate of heat transfer from the air. Air properties from tables: p=1.127 kg/m³ C, =1007 J/kg.°C k = 0.02662 W/m.°c Pr = 0.7255 v=1.702×10 m²/s Answer: (a): Te = 34.2 °C, (b): Q' = 3776 W Hint: 1- Use the Logarithmic mean temperature difference relations. 2- If: Reer> 2300, in pipes and ducts, the flow is turbulent. T, = 10°C Air duet 15 cm x 20 cm Air L-7 m 50°C 7 m/sarrow_forwardA saturated steam at 410K is being transported in a pipeline (brass drawing tubing) at a rate of 1 grams/second. Pipe has inside diameter of 0.025 m . The tube is 100m long. The pressure at the entrance is 80kPa. (use Perry's Handbook for the properties and constants) R = 8314J/kg mol K; MW=18.02g/mol a. What is the value of G in kg/s.m2? b. What is the value of friction factor? c. What is the % of pressure drop? d. Calculate the outlet pressure.arrow_forward(heat transfer ) thanks The velocity of the fluid flowing in parallel over a 500mmx500mm flat heater surface is U= 19 m/s and the inlet velocity temperature is T_∞15 C. The surface temperature of this plate is T_s140 C, the friction force is F_D=0.4 N and the surface area of the plate is A=0.32 m2. According to this;(F_D= 0.4N A=32 m2)a) Surface shear stressb) Find the coefficient of frictionc) Heat transfer coefficientd) What is the amount of heat transfer (electric power) that must be given to maintain a constant surface temperature?arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning