Condensation of Steam on Vertical Tubes. Steam at 1 atm pressure abs and100°C is condensing on a bank of five vertical tubes each 0.305 m high andhaving an OD of 25.4 mm. The tubes are arranged in a bundle spaced farenough apart so that they do not interfere with each other. The surface temper-ature of the tubes is 97.78°C. Calculate the average heat-transfer coefficient andthe total kg condensate per hour.Ans. h = 15 240 W/m².K

The average film temperature is, Tf = 100+97.782Tf = 98.89oC The average heat transfer coefficient…

Answered: Condensation of Steam on Vertical…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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3- Calculate heat transfer flux of a wall with two layers of insulations. The inner wall is at constant temperature of 200 F°. Two insulation layers are 3 inches thick and have conductivities of 0.08 and 0.1 Btu/hr-ft-Fº. Outside Temperature is 60 Fº with the heat transfer coefficient of 5 Btu/hr-ft2-F°.
A 2 inch Schedule 40 pipe carrying hot fluid coated with insulation 2 cm thick. The conductivity of this insulation k = 0.06 W / m.K. This insulation is useful for reducing heat. The inner diameter and outer diameter of the pipe are 5.25 cm and 6.03 cm, respectively. The inner surface temperature of the pipe is 150 ° C and the outer surface temperature of the insulation is 25 ° C. Pipe conductivity = 43 W / m.K. Calculate: a. Heat transfer rate per m pipe length b. Pipe outer surface temperature
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11. An industrial furnace wall is constructed of 0.7 ft thick fireclay having k= 0.6 BTU/hr- ft-°F. This is covered on the outer surface with a 0.1 ft. thick låyer of insulating material having k outermost is 100°F. Calculate the steady heat transfer per square foot. a. 464 BTU/hr-ft? b. 258 BTU/hr-ft? 0.04 BTU/hr-ft-°F. The innermost surface is at 1800°F and the %3D c. 364 BTU/hr-ft? d. 554 BTU/hr-ft? 12. It is a method of developing the design for a heat exchanger wherein the engineer assures the existence of an exchanger and makes calculations to determine if the exchanger would handle the process requirements under reasonable conditions. a. heat exchanger modeling b. heat exchanger calculation c. rating a heat exchanger d. evaluation of heat exchanger performance 13. The formula for log-mean témperature between T¡ and T2 is T +T T - T с. а. In (T3 /T) 2 In (7; /T, ) b. T, - T T-T d. In(7,/7,) 14. Water at 25°C is flowing through an elliptical conduit with semi-axis a = 4 and b = 3.…
Draw the thermal resistance circuit and evaluate the total resistance for the following a. Rectangular object [2 MARKS] Insulation Material. 1 with ki Material.2 with k2 O k, Material.3 with k3 A. T 4=L2 b. Cylindrical pipe, consists of three materials (with length L) [2 MARKS] KI Material. 1 with ki 12 Material.2 with k2 Tei, hị Material.3 with k3 Tw2, hạ K2 K3
A 25 mm diameter egg roll (k = 1 W/m degree) is roasted with the help of microwave heating. For good quality roasting, it is desired that temperature at the center of roll is maintained at 100 degree Celsius when the surrounding temperature is 25 degree Celsius. What should be the heating capacity in W/m of the microwave if the heat transfer coefficient on the surface of egg roll is 20 W/m degree? a) 613.31 k W/m b) 93.31 k W/m c) 6713.31 k W/m d) 213.31 k W/m³
A furnace of 70- by 60- by 90-cm inside dimensions is constructed of a material having athermal conductivity of 1.05 kJ/kg °C. The wall thickness is 15 cm. The inner and outersurface temperatures are 500 and 100 °C, respectively. Calculate the heat loss through thefurnace wall.
Analyze the following diagram. What is the heat rate to the left side of the heater? What is the heat rate to the right side of the heater? Tin = 16°C W h = 40- T = -20°C u = 188 m2K 60mm Air 60mm 10mm 6mm 10mm 14mm 6mm 2mm 2mm Blue: Epoxy Grey: Aluminum Green: Fiberglass Yellow: Silicone Orange: Heater Blanket, 2000w Note: Treat the outer left wall as flat plates in external convection. Note: Ignore the thickness of the heater blanket.
Nitrogen at 2 atm and 500 K flows across a 40-cm-square plate at a velocity of 25 m/s. Calculate the cooling required to maintain the plate surface at a constant temperature of 300 K.
The exhaust duct from a heater has an inside diameter of 114.3 mm with ceramic walls 6.4 mm thick. The average k=1.52 W/m· K. Outside this wall, an insulation or rock wool 102 mm thick is installed. The thermal conductivity of the rock wool is k= 0.046+ 1.56 x 104 T°C (W/m · K). The inside surface * = temperature of the ceramic is T1 = 588.7 K, and the outside surface temperature of the insulation is 311 K. Calculate the heat loss for 1.5 m of duct and the interface temperature T2 between the ceramic and the insulation. [Hint: The correct value of km for the insulation is that evaluated at the mean temperature of (T2 + T3)/2. Hence, for the first trial assume a mean temperature of, say, 448 K. Then calculate the heat loss and T2 Using this new T2, calculate a new mean temperature and proceed as before.]
A large slab of copper is initially at a uniform temperature of 90◦C. Its surfacetemperature is suddenly lowered to 30◦C. Calculate the heat-transfer rate through aplane 7.5 cm from the surface 10 s after the surface temperature is lowered.
In a meat processing plant, 2 cm-thick steaks (k=0.45 W/m-K and α=0.91×10-7m²/s) that are initially at 25 °C are to be cooled by passing them through arefrigeration room at -10 °C. The heat transfer coefficient on both sides of thesteaks is 9 W/m²-K. If both sides of the steaks (surface temperature) are to becooled to 3 °C, determine how long the steaks should be kept in the refrigerationroom. What will be the center temperature of the steaks at the end of theprocess?

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