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 3.2P
Determine the humidity ratio, enthalpy, and specific volume for saturated air at one standard atmosphere using perfect gas relations for temperatures of (a) 80 F (27 C) and (b)32F(0 C).
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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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- If 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_forwardHow much heat and moisture must be added to 8 cubic meter per minute of air at 17 C dry bulb and 35% relative humidity to raise it to 40 C and 45% relative humidity? Show the psychometric chart diagram on your paper.arrow_forwardUsing the psychrometric chart, for atmospheric air at 1 atm. Dry-bulb Temperature = 23 degrees C Relative humidity = 50 % Determine the Wet-bulb Temperature in degrees Carrow_forward
- Calculate the humidity ratio, enthalpy, and spe- cific volume for saturated air at 30°F (-1°C) and 80°F (27°C) at sea level.arrow_forward2,000 m3 /h of return air at 25 °C and 40% relative humidity are mixed with 500 m3 /hof outside air at 3 7 °C and 60% relative humidity before entering a cooling coil. Themixed air is then cooled sensibly to 1 7 °C.Sketch the process on the psychrometric chart and find the followings:a- Humidity ratio of mixed air before entering the cooling coil.b- Enthalpy of mixed air before entering the cooling coil.c- Relative humidity and d~w point temperature of the supply air.d- Coil cooling capacity.arrow_forwardAmbient air is at a pressure of 100 kPa, dry bulb temperature of 300C and 60% relative humidity. The saturation pressure of water at 300C is 4.24 kPa. The specific humidity of air (in g/ kg of dry air) is (correct to two decimal places).arrow_forward
- Atmospheric air at 760 mm Hg is at 22°C dry bulb temperature and 20°C wet bulb temperature. Using the psychrometric chart, determine: Relative humidity. Humidity ratio. Dew-point temperature. Enthalpy of air per kg dry air. Volume of moist air/kg dry air.arrow_forwardIf 65°F air with a 60% relative humidity is heated to 85°F, what is its relativehumidity at this new temperature?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
- An air-conditioning system operates at a total pressure of one atmosphere and consists of a heating section and an evaporative cooler. Air enters the heating section at 10 °C and 70 percent relative humidity at a rate of 30 m3/min, and it leaves the evaporative cooler at 20 °C and 60 percent relative humidity. Use this information to answer the following question. Choose the nearest value given in (a) – (e).The rate of water added to air in the evaporative cooler (kg/min) is (a) 0.12 (b) 0.67 (c) 13 (d) 37 (e) 67arrow_forwardA closed vessel contains moist air at 30°C and 2.14 bar. When the system is cooled at constant pressure, it was observed that water droplets began to appear at a temperature of 20°C. What is the humidity ratio of the moist air? Express your answer in kg v/kg da.arrow_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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