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 3, Problem 3.14P
The environmental conditions in a room are to be regulated so that the dry bulb temperature will be greater than or equal to 72 F (22 C) and the dew point will be less than or equal to 52 F (11 C). What maximum relative humidity can occur for standard barometric pressure?
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What is the maxmium specific humidity of air at -30C is ________________and the maximum specific humdity of air at -10 C is _______________; therefore, the difference in maximum specific humidity between -30C and -10C is _____________. The maximum specific humidity of air at 30 C is ________________ and the maximum specific humidity of air at 10 C is ____________; therefore, the difference in maximum specific humidity between 30C and 10C is ______________.
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Chapter 3 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 3 - A space is at a temperature of 75 F (24 C), and...Ch. 3 - Determine the humidity ratio, enthalpy, and...Ch. 3 - Suppose the air of Problem 3-2 is at a pressure...Ch. 3 - What is the enthalpy of moist air at 70 F (20 C)...Ch. 3 - The inside surface temperature of a window in a...Ch. 3 - What is the mass flow rate of dry air flowing at a...Ch. 3 - Determine the dew point of moist air at 80 F (27...Ch. 3 - A room is to be maintained at 72 F (22 C) db. It...Ch. 3 - Air is cooled from 80 F db and 67 F wb until it is...Ch. 3 - Conditions in a room are measured to be 80 F db...
Ch. 3 - The environmental conditions in a room are to be...Ch. 3 - Air enters a cooling coil at the rate of 5000 cfm...Ch. 3 - Air flowing in a duct has dry and wet bulb...Ch. 3 - Air is humidified with the dry bulb temperature...Ch. 3 - Air at 38 C db and 20 C wb is humidified...Ch. 3 - Two thousand cfm (1.0 m3/s) of air at an initial...Ch. 3 - Air at 40 F (5 C) db and 35 F (2 C) wb is mixed...Ch. 3 - Rework Problem 3-25, using Chart 1a, with the...Ch. 3 - The design cooling load for a zone in a building...Ch. 3 - Assume that the air in Problem 3-22 is supplied to...Ch. 3 - The sensible heat loss from a space is 500,000...Ch. 3 - Air enters a refrigeration coil at 90 Fdb and 75...Ch. 3 - A building has a total heating load of 200,000...Ch. 3 - Reconsider Problem 3-36 for an elevation of 5000...Ch. 3 - The system of Problem 3-34 has a supply air fan...Ch. 3 - An evaporative cooling system is to be used to...Ch. 3 - A cooling system is being designed for use at high...Ch. 3 - Consider a space heating system designed as shown...Ch. 3 - A variable-air-volume VAV cooling system is a type...Ch. 3 - Rework Problem 3-43 for an elevation of 5000 feet...Ch. 3 - The design condition for a space is 77 F (25 C) db...Ch. 3 - Rework Problem 3-45 for an elevation of 5000 feet...Ch. 3 - It is necessary to cool and dehumidify air from 80...Ch. 3 - Conditions in one zone of a dual-duct conditioning...Ch. 3 - Rework Problem 3-48 for an elevation of 5000 ft...Ch. 3 - A water coil in Problem 3-48 cools return air to...Ch. 3 - A multizone air handler provides air to several...Ch. 3 - Under normal operating conditions a zone has a...Ch. 3 - An interior zone of a large building is designed...Ch. 3 - Outdoor air is mixed with room return air to...Ch. 3 - Consider an enclosed swimming pool. The pool area...Ch. 3 - One particular zone served by a multizone air...Ch. 3 - A research building requires 100 percent outdoor...Ch. 3 - A space requires cooling in the amount of 120,000...
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- Please explain what tables are used to find the answers.arrow_forwardIf moist air has a saturation humidity ratio of 0.016872 kg v/kg da at a pressure of 1.2 bar, what is the dew point temperature at this state? Note: ta- twb = tap for saturated air. Express your answer in °C.arrow_forwardIf the air temperature is 85°F, what is the water vapor pressure corresponding to a relative humidity of 55 percent and at 55°F with 25 percent relative humidity.arrow_forward
- ASHRAE standard 55, Thermal Environmental Conditions for Human Occupancy, notes that for thermal comfort purposes, the indoor temperature should range from approximately 67ºF to 82°F (19.4ºC to 27.8ºC), and systems designed to control humidity must be able to maintain a dew-point temperature of 16.8°C (62.2°F). ASHRAE standard 62.1, Ventilation and Acceptable Indoor Air Quality, recommends that relative humidity in occupied spaces be controlled to less than 65% to reduce the likelihood of conditions that can lead to microbial growth. Determine the minimum allowable indoor temperature that will ensure a humidity control system designed according to ASHRAE standard 55 will also satisfy the humidity requirements of standard 62.1arrow_forwardMoist air at a dry bulb temperature of 22°C has a relative humidity of 60% when the barometric pressure is 101.325 kPA. Determine: a) the partial pressures of vapor, kPa b) the dew point temperature, °C c) the enthalpy of the vapor, kJ/kgarrow_forwardA sample of air is having dry bulb temperature 21°C and relative humidity 30% at barometric pressure of 760 mm of Hg. Find: 1. Partial pressure of vapor 2. Specific humidity 3. Wet bulb temperature and corresponding saturation pressure 4. Percentage humidity or degree of saturation 5. Specific volume of dry air 6. Dew point temperature 7. Enthalpy of moist air per kg of dry air Given: R - 0.287 kJ/kg K; cp dry air) = 1.005 kJ/kg K; specific heat of superheated vapor = 1.884 kJ/kg K and latent heat of vaporization at dew point temperature = 2493 kJ/kg. Do not use psychrometric chart. Psychrometric tables can be used.arrow_forward
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