REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
8th Edition
ISBN: 9781337370042
Author: TOMCZYK
Publisher: CENGAGE L
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Chapter 31, Problem 57RQ
Why is a metal vent often preferred rather than a masonry chimney?
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العنوان
on
Jon
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.
Example(2):
Double effect evaporator is used for
concentrating a certain caustic soda
solution 10000kg/hr from 9wt% to
47wt%. The feed at 30°C enters the
first evaporator. Backward arrangement
evaporators are used. steam is available at
167.7°C and the vapor space in the second
effect is 14.6Kpa.
The overall heat transfer coefficients of
the two effects are 8380 and 6285kcal/
W.CH
ork
-conce
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and-ans..
112.1
а
DiD
3
respectively and the specific heat capacity
of all caustic soda solution 3.771 KJ/Kg.
°C, determine the heat transfer area of
each effect
معدلة 5:48 م
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Chapter 31 Solutions
REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
Ch. 31 - The four types of gas furnace airflow patterns are...Ch. 31 - Describe the function of a multipoise or...Ch. 31 - Describe the function of a draft safeguard switch.Ch. 31 - Where are auxiliary limit switches used in heating...Ch. 31 - The specific gravity of natural gas is A. 0.08. B....Ch. 31 - Prob. 6RQCh. 31 - The pressure at the manifold for natural gas is...Ch. 31 - Prob. 8RQCh. 31 - The typical manifold pressurefor propane gas...Ch. 31 - Why is excess air supplied to all gas-burning...
Ch. 31 - Prob. 11RQCh. 31 - True or False: All gas valves snap open and...Ch. 31 - Which of the following features does an automatic...Ch. 31 - What is the function of the servo pressure...Ch. 31 - What is a redundant gas valve?Ch. 31 - Prob. 16RQCh. 31 - Prob. 17RQCh. 31 - Prob. 18RQCh. 31 - Prob. 19RQCh. 31 - What is an integrated furnace controller (IFC)?Ch. 31 - What is meant by the warm-air blower's off-delay...Ch. 31 - What are dual-in-line-pair (DIP) switches?Ch. 31 - Prob. 23RQCh. 31 - Describe the two types of pilot lights.Ch. 31 - True or False: A thermocouple develops direct...Ch. 31 - Describe how a thermocouple flame-proving system...Ch. 31 - Prob. 27RQCh. 31 - Describe how a liquid-filled flame-proving system...Ch. 31 - Prob. 29RQCh. 31 - Describe a flame rectification flame-proving...Ch. 31 - Prob. 31RQCh. 31 - Describe the difference between a single-rod...Ch. 31 - Prob. 33RQCh. 31 - Prob. 34RQCh. 31 - Prob. 35RQCh. 31 - Prob. 36RQCh. 31 - Define the dew point temperature as it applies to...Ch. 31 - Prob. 38RQCh. 31 - Prob. 39RQCh. 31 - What are four factors that determine the...Ch. 31 - What is a 100% shutoff system?Ch. 31 - What is the difference between a hard and a soft...Ch. 31 - Prob. 43RQCh. 31 - When would a combustion blower ever interpurge a...Ch. 31 - Prob. 45RQCh. 31 - An orifice is a drilled hole in a _______.Ch. 31 - A______ distributes gas to the various burners.Ch. 31 - True or False: An orifice measures the quantity of...Ch. 31 - Prob. 49RQCh. 31 - The ________transfers heat from the hot gas to the...Ch. 31 - Name two types of fan switches.Ch. 31 - Prob. 52RQCh. 31 - Prob. 53RQCh. 31 - Describe how a two-stage furnace operates.Ch. 31 - Describe how a modulating furnace operates.Ch. 31 - What is a variable-output programmable thermostat?Ch. 31 - Why is a metal vent often preferred rather than a...Ch. 31 - Prob. 58RQCh. 31 - Describe why you should never use a flame to leak...Ch. 31 - Prob. 60RQCh. 31 - A _____________sample is taken from the flue gas...
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- give me solution math not explinarrow_forwardgive me solution math not explinarrow_forwarduse Q Strips of material 10 mm thick are dried under constant drying conditions from 28 to 13 per cent moisture in 25 ks. The equilibrium moisture content is 7 per cent. The relation between E, the ratio of the final free moisture content at time t to the initial free moisture content, and the parameter J is given by: E 1 0.64 0.49 0.38 0.295 0.22 0.14 J 0 0.1 0.2 0.3 0.5 0.6 العنوان 0.7 It may be noted that J = kt/12, where, k = constant, t = time (ks) 1 = thickness/2 of the sheet of material (mm) a. Based on the given data, plot a graph of E against J b. Determine the time taken to dry 60 mm planks from 22 to 10 per cent moisture under the same conditions assuming no loss from the edges? ina östler ۲/۱arrow_forward
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