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 3.12P
Conditions in a room are measured to be 80 F db and 65 F wb, respectively. Compute the humidity ratio and relative humidity for the air at (a) sea levelland (b) 5000 ft.
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Calculate (a) the specific volume, (b) Enthalpl, and (e) the absolute humidity of the air at 45 ° C and the relative humidity of 20% at a barometric pressure of 740 mm Hg.
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(c) absolute humidity = (kg water / kg air)
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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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- On a day with an air temperature of 75°F, you read the psychrometer and determine the relative humidity to be 86%. A sudden weather change (that does not affect the actual moisture content of the air) reduces the relative humidity to 83%. What was the temperature change?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_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
- 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_forwardA sample of moist air with a volume of 3.5 m3 has a dry bulb temperature of 40°C and a relative humidity of 50%. The total pressure is 90 kPa. -Calculate the humidity ratio in kg/kg-The degree of saturation in %-The specific volume in m3 per kg-The mass in kg-The enthalpy in kJ/kgarrow_forwardIf the partial pressure of water is 3Mpa and the corresponding saturated pressure is 3.5 Mpa, determine its relative humidity and water activity.arrow_forward
- A cooling duct receives air at 1 atm, 32°C, and 70% relative humidity with a velocity of 120m/min. This air passes over cooling coils filled with flowing water. This steadily flowing water experiences a for temperature rise during its time in the cooling duct coils. Meanwhile, the airflow leaves the cooling section saturated at 20°C. Determine (a) the rate of heat transfer, (b) the mass flow rate of the cooling water, (c) the flow rate of any condensate formed, and (d) the exit velocity of the air stream. Assume the cooling water has constant specific heat. Feel free to use the psychrometric chart on the next page for the air properties.arrow_forwardA quantity of moist air of mass 4 kg has a humidity ratio of 0.019 and a relative humidity of 65%. The pressure is 95 kPa. -What is the dry-bulb temperature in °C?-What is the volume of the air sample in m^3?-What is the dew-point temperature in °C?-What is the enthalpy in kJ/kg?arrow_forwardAir enters the heating section of an air-conditioning at 1atm, 10C, and 70 percent relative humidity at a rate of 35m^3/min, and it leaves the humidifying section at 20C with a relative humidity of 90 percent. If the humidifier supplies wet steam at 100C, determine: The temperature and relative humidity of the air leaving the heating section The rate of heat transfer in the heating sectionarrow_forward
- If the relative humidity of air is 77 % at 18.0°C, what is the partial pressure of water vapor in the air in the unit of kPa? The saturation water vapor pressure at 18.0°C is 2.07 kPaarrow_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_forwardThe temperature of the air in a house is 24 °C and the relative humidity is 0.4. Since the air is cooled at constant pressure, what is the temperature at which water vapor in the air begins to condense?arrow_forward
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