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 3.23P
Air at 38 C db and 20 C wb is humidified adiabatically with liquid water supplied at 60 C in such propoions that a relative humidity of 80 percent results. Find the final dry bulb temperature.
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Q1: Moist air at 40°CDBT, 20°CWBT, and standard atmospheric pressure is
humidified adiabatically to 25°CDBT and 70% RH. Find the amount of moisture and
heat added per Kg of air. (answer without using of psychrometric chart).
A combination air cooler and dehumidification unit recover outside ambient air at 35 oC, 100 kPa, 90% relative humidity. This air-water vapor mixture is first cooled to a low temperature to condense the proper amount of water, after which the air-vapor mixture is heated, leaving the unit at 20 oC, 30% relative humidity. The volume flow rate of the air-vapor mixture at the exit conditions is 0.01 m3/s.
Find the temperature to which the mixture is initially cooled, and the mass of water condensed per kilogram of dry air.
Assuming that all the liquid water condensed leaves the unit at the minimum temperature, calculate the overall heat transfer rate.
How high a relative humidity must a 35°C air have in order to obtain saturated airat 18°C by evaporative cooling?
solve with complete diagram
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Suppose 1.17 kg of water at 19.3 C is mixed with 1.33 kg of water at 94"C. After equilib- rium is reachod, the mixture has an uniforem temperature of 59.0404 C. What is the change in entropy of the syetem? 4186 J/kg K. Arwer in unita of 3/K. The specific heat of water isarrow_forwardShow schematic diagram and complete solution.arrow_forwardQ.2: A conditioned space with an indoor condition of 24 °C DB and 50% RH, has a sensible load of 40 kw and latent load of 9 kW. The outdoor air (at 38 °C and 50% relative humidity) flowing with volume flow rate of 2000 m/h, is mixed with the returned air before passing over a cooling coil. Assume the air leaves the cooling coil with 90% RH and assume sea level pressure and find: a) The condition of the air supplied to the space and the rate of air supplied to the space. b) The sensible, latent and total load of the cooling coil. c) The dew point and the bypass factor of the cooling coil. d) The rate at which the moisture removed at the cooling coil. e) Represent all the processes on the psychrometric chart.arrow_forward
- Please provide step by step and complete solution with diagram for this problem. At 30oC, air-vapor mixture has a relative humidity of 80%. Find the humidity ratio if barometricpressure is 100 Kpa. At 30oC, Psat = 4.246 kpa A. 0.123 B. 0.986 C. 0.054 D. 5.98arrow_forwardThe dry bulb temperature of the air in a room is 25 oC and the wet bulbtemperature is 20 oC. Find the relative humidity of the air.arrow_forwardPROBLEM: IIC - 12 BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUDarrow_forward
- How high a relative humidity must be for a 35°C air in order to obtain a saturated air at 18°C by sensible cooling? How much heat is involved? Assume barometric pressure to standard.arrow_forwardHow much heat must be removed in order to cool air at 37oC dry bulb and 40% relative humidity to a temperature of 30oC without any loses in moisture? a.Draw the process on the psychrometric Chart on this page(labelstate 1 and state 2)arrow_forward11. Find the mass fraction of water vapor in moist air at 30 psia, 200 F, and 65%.arrow_forward
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