REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
8th Edition
ISBN: 9781337370042
Author: TOMCZYK
Publisher: CENGAGE L
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Chapter 38, Problem 10RQ
Why must flexible duct be stretched slightly for straight runs?
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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
O
5) A 100 kg batch of granular solids
containing 30% moisture is to be dried in
a tray drier to
15.5% by passing a current of air at 350
K tangentially across its surface at a
velocity of 1.8
m/s. If the constant rate of drying under
these conditions is 0.7 g/s m2
and the critical moisture
content is 15%, calculate the
approximate drying time. Assume the
drying surface to be 0.03
m2
/kg dry mass.
O
Solve for v and I
Chapter 38 Solutions
REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
Ch. 38 - The three crafts normally associated with an...Ch. 38 - True or False: The flexible duct system is the...Ch. 38 - Name the two fasteners that typically fasten...Ch. 38 - What fastener is normally used to fasten round...Ch. 38 - True or False: Insulation on duct does not prevent...Ch. 38 - When insulation on the inside of the duct comes...Ch. 38 - Most duct insulation is made of_________.Ch. 38 - What is the purpose of the flexible duct...Ch. 38 - What happens if flexible duct is turned too...Ch. 38 - Why must flexible duct be stretched slightly for...
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