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 4.9P
What do you think is the best thermostat setting (air dry bulb temperature) in a shop where the workmen are standing, walking, lifting, and performing various machining tasks? Assume that a globe temperature measurement reads 72 F (22 C), the relative humidity will be in the 45 percent range, and air motion will likely be around 30 ft/mm (0.15 m/s). The men are dressed in typical summer garments
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Using the standard tables (Appendix C, Tables C-1 and C-2), determine the relative humidity and dew-point temperature if the dry-bulb thermometer reads 22°C and the wet-bulb thermometer reads 16°C. How would the relative humidity and dew point change if the wet-bulb reading were 19°C?
Define the range of permissible values for the barometric pressure, relative humidity, and temperature in your environment.
6. Assuming dry- and wet-bulb temperatures of 75 and 63°F, respectively, and using the psychrometric tables of Appendix B, determine (a) dewpoint temperature, (b) relative humidity, (e) saturation vapor pressure, and (d) actual vapor pressure.
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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- what is the specific volume of an air mixture at 30 degrees celcius and relative humidity of 40% at 101.3 KPa barometric pressurearrow_forwardIf the dry-bulb temperature of the air surrounding a typical cooling is 90 degrees Fahrenheit and the relative humidity of the air is 50%, the cooling tower should be able to cool the water in the tower to a temperature of: A. 82 degree Fahrenheit B. 75 degree Fahrenheit C. 89 degree Fahrenheit D. 95 degree Fahrenheitarrow_forwardIs it possible that during sensible cooling process the condition of air reaches a relative humidity of more than 100% or Is it possible that during sensible cooling process the condition of air reaches a relative humidity of 0%?arrow_forward
- Based on the conversion table below, what is the dry bulb temperature if the relative humidity is 63% and the wet bulb temperature reading is 20C? Express your answer in degrees Celsius (excluding units).arrow_forwardAnswer the following: 3. Why do we need to control the temperature and humidity in the aircraft hangar? How does it affect our aircraft mechanics who're working inside the hangar?arrow_forwarddiscuss the effect of the property below in relation to SENSIBLE COOLING process. What happen to its RELATIVE HUMIDITY during the process? What happen to its SPECIFIC HUMIDITY during the process? What if the cooling process reaches the dew point temperature? What if the cooling process is below its dew point temperature?arrow_forward
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- An air-conditioned classroom in Texas is maintained at 72ºF in the summer. The students attend classes in shorts, sandals, and tee shirts and are quite comfortable. In the same classroom during the winter, the same students wear wool slacks, long-sleeve shirts, and sweaters, and are equally comfortable with the room temperature maintained at 75ºF. Assuming that humidity is not a factor, explain this apparent anomaly in "temperature comfort."arrow_forwardThe air in a room has a dry-bulb temperature of 22°C and a wet-bulb temperature of 16°C. Assuming a pressure of 100 kPa, determine (a) the specific humidity, (b) the relative humidity, and (c) the dew-point temperature.arrow_forwardA 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_forward
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