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 3.41P
A cooling system is being designed for use at high elevation (5000 ft or 1500 m) where the outdoor air is very dry. The space with a high latent load,
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Air 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:
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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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- 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_forwardAn air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and an evaporative cooler. Air enters the heating section at 15OC and 55 percent relative humidity at a rate of 30 m3 /min, and it leaves the evaporative cooler at 25OC and 45 percent relatively humidity. Determine the TOR.arrow_forward28 m3/min of air at 43°C dry bulb temperature and 15% relative humidity are mixed adiabatically with 14.0 m3/min of air at 18°Cdb temperature and 90% relative humidity. Calculate for the final Humidity Ratio (kgwv/kgda)? <Psat 43°C = 8.649 kPa, Psat 18°C = 2.064kPa>arrow_forward
- Two humid airstreams are adiabatically mixed at 1 atm pressure to form a third stream. The first stream has a temperature of 100°F, a relative humidity of 90 percent, and a volume flow rate of 3 ft3/s, while the second stream has a temperature of 50°F, a relative humidity of 30 percent, and a volume flow rate of 1 ft3/s. Calculate the third stream’s temperature and relative humidity. Use data from the psychrometric chart. The third stream’s temperature is _________°F. The relative humidity is___________ %.arrow_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_forwardAn air-conditioning system is to take in outdoor air at 10 C and 30 percent relative humidity at a steady rate of 45 m3/min and to condition it to 25 C and 60 percent relative humidity. The outdoor air is first heated to 22 C in the heating section and then humidified by the injection of hot steam in the humidifying section. Assuming the entire process takes place at a pressure of 100 kPa, determine a. the rate of heat supply in the heating section and b. the mass flow rate of the steam required in the humidifying section.arrow_forward
- air flowing at 2 kg / s has a dry bulb temperature of 50 ° C and a wet bulb temperature of 30 ° C, mixed with air flowing at 3kg / s at 25 ° C and a relative humidity of 70%. Using the psycometry chart determine the ratio, enthalpy and temperature of the dry ballarrow_forwardHumid air at 25 oC and 80% relative humidity is cooled and dehumidified at atmospheric pressure, and then reheated and brought to 20 oC and 40% relative humidity. Analysis will be done by drawing on the psychometric diagram.a) What is the amount of water removed from the humid air (kg water / kg dry air)? b) What is the heat withdrawn from moist air (kJ / kgdry air)? c) What is the heat (kJ / kg dry air) given from the heater to the humid air?arrow_forwardAir at 5 °C and 80% relative humidity that flows at a rate of 2 kg/ s is mixed with 4kg/ s of air at 50 °C and 20% relative humidity in a steady flow adiabatic process.Calculate the final mixture temperature and its humidity ratio.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_forwardPls. answer this ..Thank you! Two airstreams are mixed steadily and adiabatically. The first stream enters at 37 C and 32 percent relative humidity at a rate of 16 m3 /min, while the second stream enters at 13 C and 92 percent relative humidity at a rate of 25 m3 /min. Assuming that the mixing process occurs at a pressure of 1 atm, determine the specific humidity, the relative humidity, the dry-bulb temperature, and the volume flow rate of the mixture.arrow_forward
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