Heating, Ventilation, and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9781119628798
Author: Faye C. McQuiston; Jerald D. Parker; Jeffrey D. Spitler
Publisher: Wiley Global Education US
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Textbook Question
Chapter 1, Problem 1.17P
Air flowing at the rate of 1000 cfm and with a temperature of 80 F is mixed with 600 cfm of air at 30 F. Use Eq. 1-2 to estimate the final temperature of the mixed air. Assume
for both streams.
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Complete this table for refrigerant-134a:
Р, КРа
600
h, kJ/kg
180
T, °C
Phase Description
-10
0.6
-14
500
1200
300.63
44
1.0
V.
W.
Th
To
%3D
Room temperature T = 293 K
V
V. Vp
The gas volume changes from Vp to Va at constant temperature T. The cartoon on the right shows a piston of gas undergoing this
compression while submerged in a container of room temperature water, which acts as a reservoir.
The initial state of this process is a piston containing 2 moles of a monatomic gas at Tc = 293 K (room temperature water) and volume V =
a
1.0 m. The gas is compressed until V, = 0.2 m. During the compression, the heat bath of room temperature water maintains the
temperature of the gas at T 293 K.
Calculate the work done in joules by the gas during this process.
Do not include units in your answer.
Be careful to use the standard sign convention for work done by the gas.
Write your numerical answer in normal form as described above in the instructions to this worksheet.
A 0.6 m3 tank contains gas at a pressure of 5800 kPa gage, a temperature of 75 deg. Celsius and mass of 25 kg. A part of this gas was discharged and the temperature and pressure changed to 60deg. Celsius and 4130 kPa respectively. Heat was applied and the temperature was back to 75 deg. Celsius.
Find:
(a) the final mass in the tank in kg
CHOICES
9.36
15.63
18.283
(b) the discharged mass in kg.
CHOICES
6.716
15.63
9.36
(c) the final pressure of the gas in kPa gage
CHOICES
4215.56
5135.88
4135.88
Chapter 1 Solutions
Heating, Ventilation, and Air Conditioning: Analysis and Design
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Ch. 1 - Compute the heat transferred from water as it...Ch. 1 - Air enters a heat exchanger at a rate of 5000...Ch. 1 - Water flowing at a rate of 1.5 kg/s through a heat...Ch. 1 - Air at a mean temperature of 50 F flows over a...Ch. 1 - Repeat Problem 1-10 for air at 10 C, a tube with...Ch. 1 - Air at 1 atm and 76 F is flowing at the rate of...Ch. 1 - Air flowing at the rate of 1000 cfm and with a...Ch. 1 - A chiller is providing 5 tons of cooling to an air...Ch. 1 - Air is delivered to a room at 58 F and the same...Ch. 1 - A chiller is to pro;ide 12 tons of cooling to a...Ch. 1 - Air is being rnished to a 30-ft by 40-ft by 12-ft...Ch. 1 - If cold outside air at 20 F is leaking into a...Ch. 1 - A Btu-meter is a device that measures water flow...Ch. 1 - A heat pump uses a 100,000-gallon swimming pool as...Ch. 1 - A heat pump uses a 100,000-gallon swimming pooi as...
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