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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Textbook Question
Chapter 4, Problem 4.8P
An occupied space is being held at 76 F (24 C) and 50 percent relative humidity. A measurement of the globe temperature gives 80 F (27 C), and the mean air velocity is determined to be 30 fpm (0.15 m/s). Is this facility comfortable for sedentary functions of a mixed group in light clothing in the summer? If not, how would you attempt to change the situation?
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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...
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- "For an air-water system at a given moisture content, the temperature decreases as the humidity increases."Is this statement true or false? Shouldn't it be relative humidity?arrow_forwardIf the specific humidity of an environment is 20 g / kg and the dry bulb temperature is 31oC, indicate the dew point temperature, relative humidity and wet bulb temperature of the air in the table below.arrow_forwardFor air at 80 8C dry bulb temperature and 20 8C dew-point temperature, determine its humidity, relative humidity, wet bulb temperature, enthalpy, humidvolume and humid heat.arrow_forward
- A conditioned space receives warm, humidified air during winter air conditioning in order to maintain 20 °C and 30% relative humidity. The space experiences an infiltration rate of 0.3 kg/s of outdoor air and an additional sensible heat loss of 25 kW. The outdoor air is saturated at a temperature of –20 °C (see the table of properties of saturated air at atmospheric pressure of 101.325 kPa). If conditioned air is supplied at 40 °C dry-bulb temperature, what must the wetbulb temperature of supply air be in oarrow_forwardQ 6: The air in a room has a pressure of 101.3 kPa and a dry bulb temperature of 24°C, with a wet bulb temperature of 17°C. Using the psychrometric chart determine the humidity ratio, the enthalpy, the relative humidity, the dew point temperature, and the specific volume of the humid air. (Ans : 0.0094 kgv/kgda, 47.6 kJ/kgda, 50%, 12.9°C, 0.854 m/kgda) 3arrow_forward12 bales of cotton, each weighing 486 lb, were held for conditioning in a humid warehouse kept at a relative humidity of 95%. Calculate the total mass of water, in lb, held within these bales at the end of the conditioning period.arrow_forward
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