Air at 1 atmosphere and a temperature of 60 F enters 1/2-in. id tube with a velocity of 80 fps. The wall is maintained at a constant temperature of 210 F by condensing steam. Fin the convective heat-transfer coefficient for this situation if the tube is 5ft long. Find also the Q
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Air at 1 atmosphere and a temperature of 60 F enters 1/2-in. id tube with a velocity of 80 fps. The wall is maintained at a constant temperature of 210 F by condensing steam. Fin the convective heat-transfer coefficient for this situation if the tube is 5ft long. Find also the Q
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- An R-22 compressor has a 5 percent clearance volume and a displacement rate of 80 L/s and pumps against a condensing temperature of 40°C. For the two different evaporating temperatures of -10 °C, compute the refrigerant flow rate in kg/s assuming that the clearance volumetric efficiency applies.Air at 1 atmosphere and a temperature of 60f enters 1/2-in. id tube with a velocity of 80 fps. The wall is maintained at a constant temperature of 210 by condensing steam. Fin the convective heat-transfer coefficient for this situation if the tube is 5ft longQS: Water at 15.56°C i to be heated in a 2-mm-ID tube until the exit temperature reaches 26.67+C. The tube wall temperature is maintained at 48.99-C and the inlet flow velocity is 0.3 m/s. Calculate the length of tube required in meters to accomplish this heating. Also calculate the total heating required, expressed in watts. Answers: L=0.13 m
- 1. Water flows at the rate of 0.5 kg/s in a 2.5-cm-diameter tube having a length of 3 m. A constant heat flux is imposed at the tube wall so that the tube wall temperature is 40◦C higher than the water temperature. Calculate the heat transfer and estimate the temperature rise in the water. The water is pressurized so that boiling cannot occur.1.Across-flow exchangerwith both fluids unmixedand an airflow rate of 0.5 kg/s on bothsides. The hot air enters at 350oC while thecool air enters at 20oC. Calculate the exit temperatures for U = 60 W/m2· oC anda total exchanger area of 15 m2.What would be the exittemperatures if the flow rates were cut in half, assuming no change in U? What if the flow rates weredoubled? 2.The shell fluid,ethylene glycol, enters at 120oC and leaves at 60oCwitha flow rate of 4000 kg/h. Water flows in the tubes, entering at 35oCand leaving at85oC. The overall heat-transfer coefficient for this arrangement is 900W/m2·oC.The exchanger is a shell tube with two shell passes and two tube passes.Calculate the following: a) The water exit temperature if flow rate of glycol to the exchanger is reduced in half with the entrance temperatures of both fluids remaining the same and by how much is the heat-transfer rate reduced?; b) The percentage reduction of heat transfer if water-flow rate is reduced by…1. Across-flow exchangerwith both fluids unmixedand an airflow rate of 0.5 kg/s on bothsides. The hot air enters at 350oC while thecool air enters at 20oC. Calculate the exit temperatures for U = 60 W/m2· oC anda total exchanger area of 15 m2.What would be the exittemperatures if the flow rates were cut in half, assuming no change in U? What if the flow rates weredoubled? 2. The shell fluid,ethylene glycol, enters at 120oC and leaves at 60oCwitha flow rate of 4000 kg/h. Water flows in the tubes, entering at 35oCand leaving at85oC. The overall heat-transfer coefficient for this arrangement is 900W/m2·oC.The exchanger is a shell tube with two shell passes and two tube passes.Calculate the following: a) The water exit temperature if flow rate of glycol to the exchanger is reduced in half with the entrance temperatures of both fluids remaining the same and by how much is the heat-transfer rate reduced?; b) The percentage reduction of heat transfer if water-flow rate is reduced by…
- As part of an industrial pipe system a 6-meter-long by .5 meter inner diameter copper pipeweighing 200kg holds a lubricating oil in place while is heats from 20 deg C to 55 deg C. At thatpoint, the valve opens and allows to oil to flow through. What is the total heat transferrequired? And, what percentage of the heat transferred does the oil and copper each accountfor? (oil density = .9 kg/L , oil specific heat = 1800 J/kgC)Fill in the blanks: A heat exchanger was installed purposely to cool 0.50 kg of gas per second. Molecular weight is 32 and k = 1.32. The gas is cooled from 150°C to 80°C. Water us available at the rate of 0.30 kg/s and a temperature of 5°C. Calculate the exit temperature of the water in °C. °CA DPHX is made of a 6-nom sch 40 commercial steel outer pipe and a 5-nomsch 40S stainless steel inner pipe. The fluid in the annular space is cyclohexanethat has a volumetric flow rate of 120 gpm and an average temperature of 60°F. The fluid in the inner tube is water at an average temperature of 180°F andflowing at 320 gpm. Cyclohexane is an organic liquid and the water can be assumed to be distilled water. The thermal conductivity of the stainless steelinner pipe is 9.5 Btu/h·ft·°F. Determine the following:a. Convective heat transfer coefficients in the inner pipe and the annulus (Btu/h·ft2·°F).b. Overall heat transfer coefficient for the case of a clean heat exchanger (Btu/h·ft2·°F).c. Overall heat transfer coefficient if fouling is considered (Btu/h·ft2·°F).
- A shell-and-tube condenser with horizontal 7/8-in BWG 16 copper tubes is used to condense benzene vapor. The vapor is condensed at atmospheric pressure, it’s enthalpy of vaporization is around 394 KJ/kg, and the thermal conductivity at the reference temperature is around 0.150 W/m.°C. Assume the cooling water average temperature to be 40°C and neglect the tube and water film resistances. a)Calculate the reference temperature Tf and evaluate the liquid properties at this temperature. You may use the textbook and/or Perry’s Chemical Engineers’ Handbook. b)Estimate the film coefficient for the top row of tubes (W/m2.°C). c)Estimate the average coefficient for a stack of 10 tubes (W/m2.°C).Water with a mass flow rate of 0.002 kg/s at 18oC flows inside a tube while the flow is already developed hydrodynamically. The inner diameter of the tube is 1.5 cm, and the inner pipe wall temperature is maintained uniformly at 125oC. Calculate the required tube length to increase the water temperature to 82oC.Steam at a pressure of 28kpa is passed into condenser and it leaves as condensate at a temperature of 592 0 Cooling water circulates through the condenser at the rate 9 of 45 kg/min. It enters at 152 and leaves at 30°C.It the Steam flow rate is 1.25 kg/min, determine the dryness r fraction of Steam as it enters the condenser.