Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrigeration and Air Conditioning Technology, 8th
8th Edition
ISBN: 9781305578708
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 50, Problem 14RQ
To determine
The economizer mode of operation that uses the system compressor(s) and has the outside air dampers at their minimum position.
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For each system below with transfer function G(s), plot the pole(s) on the s-plane.
and indicate whether the system is:
(a) "stable" (i.e., a bounded input will always result in a bounded output),
(b) "marginally stable," or
(c) "unstable"
Sketch a rough graph of the time response to a step input.
8
a) G(s) =
5-5
8
b) G(s) =
c) G(s) =
=
s+5
3s + 8
s² - 2s +2
3s +8
d) G(s):
=
s²+2s+2
3s+8
e) G(s):
=
s² +9
f) G(s):
8
00
==
S
Please answer the following question. Include all work and plase explain. Graphs are provided below. "Consider the Mg (Magnesium) - Ni (Nickel) phase diagram shown below. This phase diagram contains two eutectic reactions and two intermediate phases (Mg2Ni and MgNi2). At a temperature of 505oC, determine what the composition of an alloy would need to be to contain a mass fraction of 0.20 Mg and 0.80 Mg2Ni."
The triangular plate, having a 90∘∘ angle at AA, supports the load PP = 370 lblb as shown in (Figure 1).
Chapter 50 Solutions
Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrigeration and Air Conditioning Technology, 8th
Ch. 50 - Which of the following is true regarding the...Ch. 50 - Which process would best represent the opposite of...Ch. 50 - Mixed air is best described as the combination of...Ch. 50 - Which of the following should be taken into...Ch. 50 - A bonded roof is one that has A. reinforced steel...Ch. 50 - Properly installed roof curbs will reduce the...Ch. 50 - When rigging a unit to the roof, what minimum...Ch. 50 - What is the acceptable method for communicating...Ch. 50 - Prob. 9RQCh. 50 - Prob. 10RQ
Ch. 50 - The most efficient way to establish the best...Ch. 50 - Free-cooling can be accomplished if the
A....Ch. 50 - Prob. 13RQCh. 50 - Prob. 14RQCh. 50 - Explain why the outside air damper is typically...Ch. 50 - Briefly explain the purpose of ASHRAE Standard 62.Ch. 50 - Explain the concept of demand control ventilation.Ch. 50 - Explain how carbon dioxide levels can be used to...Ch. 50 - Describe the blowers used on VAV systems.Ch. 50 - A cooling-only VAV box has all of the following...Ch. 50 - Which of the following is true regarding a reheat...Ch. 50 - Variable refrigerant flow systems sense the...Ch. 50 - The acronym PID stands for ______, _____, and...Ch. 50 - Explain the main benefit of a heat-recovery VRF...Ch. 50 - The pump on a dry cooler can direct water to...Ch. 50 - During low ambient conditions, the space cooling...
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