HEATING, VENTILATING,+AC ANAL...EBOOK>I<
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ISBN: 2819480255750
Author: Mcquiston
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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,+AC ANAL...EBOOK>I<
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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- Using your psychrometric chart, solve the properties of air at 23 °C and relative humidity of 50%.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_forwardCalculate 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_forward
- 2,000 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_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_forwardThe pressure, dry bulb temperature and relative humidity of air in a room are 1 bar, 30°C and 70%, respectively. If the saturated steam pressure at 30°C is 4.25 kPa, the specific humidity of the room air in kg water vapour/kg dry air isarrow_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_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_forwardAir at 90F dry bulb (db) temperature and 30% relative humidity is cooled to 70 F db. The expected relative humidity will be most likely: 0.9% 30% 50% 5.5% 58%arrow_forward
- If 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_forwardUsing the Psychrometric chart, Fig. A-9, determine the relative humidity, the humidity ratio, and the specific enthalpy of the mixture, in kJ per kg of dry air, corresponding to dry-bulb and wet-bulb temperatures of 30 and 20°C, respectively. select the correct answers from the options O 55% O 68% O 74% O 40% O 68 kJ/kg dry air O 76 kJ/kg dry air O 58 kJ/kg dry air O 0.0108 kg water/kg dry air O 0.0182 kg water/kg dry air O 0.0148 kg water/kg dry airarrow_forward
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