Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 54, Problem 1SA
What is the amount of heat necessary to change the state of a substance called?
Expert Solution & Answer
To determine
The name given to the amount of heat necessary to change the state of a substance.
Answer to Problem 1SA
The heat necessary to change the state of a substance is termed as latent heat.
Explanation of Solution
When there is a change in state of a substance that is the substance becomes liquid from solid or vapor from liquid or vice versa, a huge amount of heat is required, this heat is termed as latent heat of vaporization and this process is termed as phase change.
Phase change is quite a complex process and during this process, no change in pressure or temperature is observed.
Conclusion:
Thus, the heat necessary to change the state of a substance is termed as latent heat.
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4) 1 Mg (dry weight) of a non-porous
solid is dried under constant drying
conditions with an air
velocity of 0.75 m/s parallel to the drying
surface. The area of drying surface is 55
m2
If initial
rate of drying is 0.3 g/m2
s, how long it will take to dry a material
from 0.15 to 0.025 kg water/kg
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negligible.
The falling rate of drying is linear
in moisture content. If air velocity
increases to 4 m/s, what
will be the anticipated saving in drying
time?
0
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14.23. A double-effect forward-feed
evaporator is required to give a product
consisting of 30 per cent crystals and a
mother liquor containing 40 per cent by
mass of dissolved solids. Heat transfer
coefficients are 2.8 and 1.7 kW/m² K in the
first and second effects respectively. Dry
saturated steam is supplied at 375 kN/m²
and the condenser operates at 13.5 kN/
m².
(a) What area of heating surface is
required in each effect assuming the
effects are identical, if the feed rate is 0.6
kg/s of liquor, containing 20 per cent by
mass of dissolved solids, and the feed
temperature is 313 K?
(b) What is the pressure above the boiling
liquid in the first effect?
The specific heat capacity may be
taken as constant at 4.18 kJ/kg K. and
the effects of boiling-point rise and of
hydrostatic head may be neglected.
O
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Chapter 54 Solutions
Automotive Technology
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