20. Calculate the maximum rate of evaporation in kgs-1 per m2 of surface for water at 20°C into a perfect vacuum.The vapor pressure of water at 20°C is 23.4 mbar. Assume (rather artificially) that the energy for evaporation canbe supplied at a rate sufficient to maintain the surface temperature at 20°C. On the basis of this calculation, by howmuch would the water level in an open expanse of water fall in one minute under these conditions?

The diffusion phenomenon is not considered as there is a perfect vacuum. The water vapor transfer…

Answered: Calculate the maximum rate of…

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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¡Hot water at 50°C is routed from one building in which 4. it is generated to an adjoining building in which it is used for space heating. Transfer between the buildings 192 occurs in a steel pipe (k = 60 W/m K) of 100-mm 20outside diameter and 8-mm wall thickness. During the winter, representative environmental conditions involve air at T = -5°C and V = 3 m/s in cross flow odmover the pipe. to instrub 04 (a) If the cost of producing the hot water is $0.10 per kW h, what is the representative daily cost of heat loss from an uninsulated pipe to the air per meter of pipe length? The convection resistance associated with water flow in the pipe may be neglected. (b) Determine the savings associated with application of a 10-mm-thick coating of urethane insulation (k = 0.026 W/m K) to the outer surface of the pipe. bas 0
A thin metal plate 1 mx 1 m is placed on a rooftop. It receives radiant heat from the sun directly at the rate of 170 W/m². If heat transfer from the plate to the ambient occurs purely by free convection, calculate the steady state temperature of the plate. Assume that there is no heat loss from the bottom of the plate. The ambient temperature is 25°C.
B) A mercury thermometer having a time constant of (90 sec) is initially at (300°C). It is immersed in a bath maintained at (130°C) at t = 0. Determine the temperature reading at (t=3 min) and (t = 5 min).
10.33 Saturated steam at 0.2 bar condenses with a convec- tion coefficient of 6000 W/m²2 · K on the outside of a brass tube having inner and outer diameters of 16 and 19 mm, respectively. The convection coefficient for water flowing inside the tube is 5000 W/m². K. Esti- mate the steam condensation rate per unit length of the tube when the mean water temperature is 30°C.
Transport Phenomena Question
The work done when a gas is expanded in a cylinder is -220 J. A heat transfer of 190 J occurs from the surrounding to the gas. Calculate ∆E of the gas in J.
4. A mass of 1.7 kg of saturated liquid water is completely vaporized at a constant pressure of 101.325 kPa. Determine (a) the volume change and (b) the amount of energy transferred to the water.
A large slab of aluminum has a thickness of 10 cm and is initially uniform in temperatureat 400◦C. It is then suddenly exposed to a convection environment at 90◦Cwith h=1400 W/m2 · ◦C. How long does it take the center to cool to 180◦C?
The wall of a spherical steel tank k, = 17 m. K thick contains hot oil at 100°C. On the outside of the tank 10mm of spray W urethane insulation k, = 0.026 m. K of 1m in diameter and 100 mm h = 16. is added to stop the oil from cooling. If the outside temperature is 25°C, W m².K needs to be added to keep the tank at 100°C for pumping reasons? What are the overall heat transfer coefficients (Uo and Ui)? and h = 5 (₁ m². K how much heat

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