Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Chapter 4, Problem 4.28P
A maximum of 10 smokers are anticipated in a smong room and each is expected to contribute about 150
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Calculate the EER rating of a 20 ton (240000 Btu) air conditioning unit with an
average electrical load of 30 kW.
An air conditioning plant supplies air to a room at a rate of 2.5 kg/s, the supply
air being made up of equal parts by weight of outdoor and recirculated air. The
mixed air passes through a cooler coil fitted with a by-pass duct, face and by pass
dampers being used for humidity control. The air then passes through an after
heater and supply fan. In a test on the plant, the following conditions (Table Qu
4) were recorded;
3
Table Qu. 4: Parameters recorded
Relative humidity
Dry bulb
temperature
°C
Wet bulb
temperature
°C
%
Outdoor air
270
20.5
Room air
210
50
Supply air
Air leaving cooler
160
11.8
80
90
coil
Make neat sketches showing the plant arrangement and the psychrometric cycle and
identify the corresponding points on both diagrams.
Calculate the following;
mass of air through the cooler coil
load on cooler coil
load on heater
Atmospheric air, which is a mixture of dry air and water vapour, is supplied into ducting with a cooling coil. Initially it has a relative humidity of 0.57, volumetric
flow rate of 0.72 mis and temperature of 17°C. The atmospheric air is then passed over a cooling coil such that the temperature drops to 6°C. As this is
below the dew point, the water vapour condensates after cooling coll and the air leaves in a saturated state. Assuming the barometric pressure of
atmosphenic air to be 1.01325 bar, determine the folowing quantities in question parts () to (vi):
(1) Partial pressure of water vapour in the air and water vapour mixture entering, Pul
Chapter 4 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 4 - Using Fig. 4-1, draw a conclusion about the...Ch. 4 - Using Fig. 4-1, draw a conclusion about the...Ch. 4 - Select comfortable summer design conditions (dry...Ch. 4 - It is desired to use a space as a large classroom...Ch. 4 - An indoor tennis facility finds that it has...Ch. 4 - Work Problem 4-5 for an average air speed at court...Ch. 4 - In an occupied space the mean air velocity is...Ch. 4 - An occupied space is being held at 76 F (24 C) and...Ch. 4 - What do you think is the best thermostat setting...Ch. 4 - With the air conditioning running and the...
Ch. 4 - Discuss how an emergency government mandate to set...Ch. 4 - In the heating seasons the heat loss from a...Ch. 4 - Air motion can be good or bad, depending on the...Ch. 4 - To save energy in large, chilled water systems,...Ch. 4 - Overhead fans (Casablanca fans) are often reversed...Ch. 4 - A school classroom is designed for 30 people. (a)...Ch. 4 - Carbon dioxide is being generated in an occupied...Ch. 4 - Each person in a room is assumed to be producing...Ch. 4 - An air-handling system must handle 2000 cfm with a...Ch. 4 - Prob. 4.20PCh. 4 - How many filter modules will be required using the...Ch. 4 - Work Problem 4-21 assuming that the filter is a...Ch. 4 - The M-200, 0.60.60.2 filters of Table 4-3 are to...Ch. 4 - Investigate the feasibility of using 100 percent...Ch. 4 - Work Problem 4-24 but replace the 100 percent...Ch. 4 - Using M-15 filter media and the requirement of 60...Ch. 4 - A filter system is available that will filter out...Ch. 4 - A maximum of 10 smokers are anticipated in a smong...Ch. 4 - Solve Ex. 4-4 assuming that the filter is in...Ch. 4 - Solve Problem 4-28 assuming that the filter is in...Ch. 4 - Fora 3000-ft3 combination and exercise operation,...Ch. 4 - A classroom with a capacity of 225 people is...
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