HEATING, VENTILATING,+AC ANAL...EBOOK>I<
6th Edition
ISBN: 2819480255750
Author: Mcquiston
Publisher: INTER WILE
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Chapter 4, Problem 4.7P
In an occupied space the mean air velocity is found to be 40 fpm (0.2 m/s), the dry bulb temperature is 74 F (23 C) and the globe temperature is measured to be 78 F (26 C). Calculate the operative temperature in both F and C.
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A furnace heating unit has an airflow of 2,500 CFM. The heating coil entering temperature is 35°F dry
bulb temperature with a relative humidity of 30%. the furnace heating coil leaving temperature is
80°F dry bulb temperature. Plot the points and the process line on the psychrometric chart. Find the
sensible, latent, and total loads of the coil. (hint: heating does not change the moisture content in the
air)
OUTSIDE
AIR
2,500 CFM
35°F DRY BULB TEMP.
30% RELATIVE HUMIDITY
FURNACE
80°F DRY BULB TEMP.
2
SUPPLY
AIR
Q1:
Moist air at 28 C° DBT and 20.6 C° WBT flow at a rate of 1.5 m'/s through cooling coil
and out with 12.5 C° DBT and 8.35 gram/kg dry air moisture content. The process
occurred at standard barometric pressure. Draw the psychometric figure and find
a- Coil dew point temperature.
b- Bypass factor.
c- Coil capacity.
d- Sensible and latent load.
A bank of 120-employees is maintained at 24°C db and 50% RH. The heat gain due to heat transfer through walls, roof, ..etc is 10 kW. The outside air temperature is 35°C and its relative humidity is 60%.
Calculate the followings:
(a) Ventilation air required.
(b) Sensible and latent heat gains due to occupants. (CLF = 0.86)
(c) Volumetric flow rate of supply air if the supply temperature is 18°C.
Chapter 4 Solutions
HEATING, VENTILATING,+AC ANAL...EBOOK>I<
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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