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An oil preheater consists of a single tube of
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- A Two-pass steam Condenser is designed for a full heat load of (293 MW) at a pressure of (0.05 bar). The inlet and outlet temperature of circulating water is (15 °C) and (25 °C) respectively. A (2.5 cm) Diameter, (304 Stainless Steel) Condenser tube has been selected. The water velocity inside the tubes is assumed to be (2.6 m/s). Assume the following: U₁ = 2053 W/m².C ; C₁= 4.187 kJ/kg.K ; p = 1000 kg/m³. Estimate the following: 1. The effective tube length; 2. Cooling water flow rate; 3. Total heat transfer area ; 4. Condenser Effectiveness. Water 3 2 ot Wet Steam C.Wout C.Win Qcarrow_forwardConcentric tube heat exchanger (tubular or tube in tube) is used for a large industrial gas turbine. The dimensions and values are given. One of the steps is not required to find the required length of the HX, if the oil leaves at 60 C? Oil and water inlet temperatures are 100 and 30 C, respectively. Log mean temperature difference Overall heat transfer coefficient Thermal entry length to validate the steps None of the above Reynolds number, Prandtl number and Nusselt numberarrow_forwardQUESTION 3 A multi-stage steam turbine exhausts into a two-pass surface condenser operating at a pressure of 10kPa. The steam enters the condenser with a dryness fraction of 0.85 and the condensate leaves the condenser at a temperature of 34.6°C. The tubes have an inside diameter of 18mm and a wall thickness of 1mm. Coolina water circulates through the tubes at a speed of 1.2m/s. The stean flows through the condenser at a rate of 2400kg/hr and air leaks into the system at a rate of 0.5kg/1000kg of steam condensed. Calculate: 3.1 the capacity of the air pump in m2/min.arrow_forward
- A two-pass steam surface condenser is to be designed to condense10,000 kg/hr of steam having an enthalpy of 2,240 kJ/kg. Condenserpressure is 13.79 kPa. Circulating water enters the condenser at 25 OCand leaves at 40 OC. The outside and inside diameter for a water tube;OD=20 mm , ID = 17 mm and water velocity of 3 m/s. If the overallcoefficient of heat transfer is 14,100 kJ/hr-m2-OC of outside tubesurface, determine the amount of circulating water in m3/hr.arrow_forward1) For a concentric counter-flow heat exchanger, hot oil is coming in the tube of the shell/tube heat exchanger and it's cooled by water that surrounds it in the shell. Calculate what is the required length of the heat exchanger tube in order to perform the necessary cooling. Assume there is negligible heat loss to the surroundings and negligible conductive heat resistance between the two fluids. Mass flow rate of oil = 0.17 kg/s Oil heat capacity = 2375 J/kg-ºC Oil convective heat transfer coefficient = 39.7 W/m²-°C Oil enters tube at temperature = 130 °C Oil leaves tube at temperature = 83 °C Water convective heat transfer coefficient = 2190 W/m²-°C Water enters shell at temperature 15 °C Water leaves shell at temperature = 74 °C Inner diameter = 4.5 cm Outer diameter = 6.5 cmarrow_forwardMechanical engineering : Heat transfer 1. Determine the overall heat transfer coefficient and flow rate required while using a heat exchanger , the water is enetered at 20◦C through the tubes of small single pass and the water comes out with a temperature at 40◦C. 25 kg/min of steam condenses at 60◦C on the shel side ,the area of the exchanger is 12 m2. (The latentheat, hfg, is 2358.7 kJ/kg at 60◦C.) 2 . You have unpainted aluminum siding on your house and the engineerhas based a heat loss calculation on U = 5 W/m2K. You discover thatair pollution levels are such that Rf is 0.0005 m2K/W on the siding.Should the engineer redesign the siding? If not sure skip, wrong may downvotearrow_forward
- 1- For the following design conditions:- Condenser heat load (Qc) = 293 MW Condenser Pressure (Pcond) = 0.06 bar Cooling Water inlet temperature (tw,) = 25 C° Cooling Water velocity (Vw) = 2 m/s Number of Passes (N) = Single Tube Diameter (D) Tube Length (L) = 15 m Tubes Cleanliness factor (Fclean) = 0.85 Overall heat transfer coefficient (U,) = 4000 W /m²C°. Calculate the following:- = 25 mm a. Condenser Surface area b. Cooling water mass flow rate c. Condenser effectivenessarrow_forwardFor an exhaust valve, the mass flow rate through the valve is 1.26 kg/s. The flow coefficient is 0.65 and the cylinder pressure and temperature are 625 kPa and 820 K. Assume exhaust system pressure is 103 kPa, the specific heat ratio is 1.4 and R =287J/ kg.K. The effective area of the valve is (SI unit): Select one: O a. 3.45*10-2 O b. 0.85*10-2 O c. 2.2*10-3 O d. 1.85*10-3 O e. 1.42*10-3arrow_forwardin a 10-m long center-current flow tubular heat exchanger, a liquid food, flowing in the inner pipe (inside diameter 5 cm), is heated from 4 to 60 C for pasteurization. In the outer tube (diameter 10 cm), hot water enters at 95 C and exits at 80 C. A) If the mass flow rate of the hot water is 5 kg/s, what is the flow rate of the pasteurized product? The specific heat of the water is 4.2 kJ/(kg C), specific heat of product is 3.8 kJ/(kg C) B) what is the log mean temperature difference C) What is the overall heat transfer coefficient for the heat exchanger based on the outside surface?arrow_forward
- Concentric tube heat exchanger (tubular or tube in tube) is used for a large industrial gas turbine. The dimensions and values are given. One of the steps is not required to find the required length of the HX, if the oil leaves at 60 C? Oil and water inlet temperatures are 100 and 30 C, respectively. Log mean temperature difference Thermal entry length to validate the steps Overall heat transfer coefficient Reynolds number, Prandtl number and Nusselt number None of the givenarrow_forwardSteam heating system air, water vapor passing throughit is heated by passing over pipes. Air and steamits streams are continuous streams. 200 kPa to the steam heat exchanger and200oC temperature, 8 kg per minute flow entering, 180 kPapressure is rising at 100oC and temperature. Air pressure of 100 kPa andIt enters at a temperature of 25oC and exits at a temperature of 47oC. Aircalculate the volumetric flow rate at the input.arrow_forward11 MWth plant operates at a thermal efficiency of 34%. The waste heat is dumped across a condenser which operates at a shell side pressure of 0.717 psia. For the given information below, determine the condenser tube length. A Coolant Flow Rate 4.81 x 108 Ibm/hr Coolant Inlet Temperature 60 F Number of Tubes 62,832 Lattice triangular Pitch 1.5 inch Tube OD 1 inch Tube ID 0.944 inch Tube Thermal Conductivity 10 Btu/hr-ft-F Condensing Heat Transfer Coefficient 1228 Btu/hr-ft²-Farrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning