Q4. Aspherical balloon gondola 2.5 m in diameter rises to an altitude where the ambient pressure is 1.5 kPa and the ambient temperature is -30-C. The outside surface of the sphere is at approximately 5 C. Estimate the free-convection heat loss/ from the outside of the sphere. 9.hACT
Q4. Aspherical balloon gondola 2.5 m in diameter rises to an altitude where the ambient pressure is 1.5 kPa and the ambient temperature is -30-C. The outside surface of the sphere is at approximately 5 C. Estimate the free-convection heat loss/ from the outside of the sphere. 9.hACT
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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Transcribed Image Text:Q4. Aspherical balloon gondola 2.5 m in diameter rises to an altitude where the
ambient pressure is 1.5 kPa and the ambient temperature is -30°C. The outside
surface of the sphere is at approximately 5-C. Estimate the free-convection heat loss
from the outside of the sphere.
q=hACT
Q5. A counter flow double-pipe heat exchanger is used to heat liquid ammonia
(Cp-4.8 kJ/kg C) from 5 to 35-C with hot water that enters the exchanger at 60°C.
The flow rate of the water is 4.0 kg/s and the overall heat-transfer coefficient is 900
W/m² C. The area of the heat exchanger is 25 m². Calculate the flow rate of
ammonia. Determine the exit hot water temperature in case of parallel flow double-
pipe heat exchanger.
Q6. Ashell-and-tube heat exchanger with one shell pass and four tube passes is
designed to heat 3600 kg/h of engine oil (Cp-2.1 kJ/kg C) from 30°C to 80°C with
the oil in the tube side. On the shell side is condensing steam at 1-atm pressure, and
the overall heat-transfer coefficient is 1200 W/m² C. Determine the area of the
heat exchanger. If the flow of oil is reduced in half while the inlet temperature and
U value are kept the same, calculate the mass flow of condensed steam. (latent heat
of condensation of water at 1-atm -2.26x10³ kJ/kg).
"
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