Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 16, Problem 4RQ
A control loop contains _______, _______, and _________.
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1.1 Consider the fireclay brick wall of Example 1.1 that is
operating under different thermal conditions. The tem-
perature distribution, at an instant in time, is T(x) = a+
bx where a 1400 K and b = -1000 K/m. Determine
the heat fluxes, q", and heat rates, q, at x = 0 and x = L.
Do steady-state conditions exist?
2.4 To determine the effect of the temperature dependence
of the thermal conductivity on the temperature dis-
tribution in a solid, consider a material for which this
dependence may be represented as
k = k₁ + aT
where k, is a positive constant and a is a coefficient that
may be positive or negative. Sketch the steady-state
temperature distribution associated with heat transfer
in a plane wall for three cases corresponding to a > 0,
a = 0, and a < 0.
1.21 A one-dimensional plane wall is exposed to convective
and radiative conditions at x = 0. The ambient and sur-
rounding temperatures are T = 20°C and Tur = 40°C,
respectively. The convection heat transfer coefficient is
h=20 W/m² K, and the absorptivity of the exposed sur-
face is α=0.78. Determine the convective and radiative
heat fluxes to the wall at x = 0 if the wall surface tem-
perature is T, = 24°C. Assume the exposed wall surface
is gray, and the surroundings are large.
Chapter 16 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 16 - True or False: Pneumatic controls are...Ch. 16 - Pneumatic controls are operated by A. water. B....Ch. 16 - One advantage of a modern control system is A....Ch. 16 - A control loop contains _______, _______, and...Ch. 16 - Pneumatic air must A. be clean and dry. B. have...Ch. 16 - The air supplied to a diaphragm is 20 psig, and...Ch. 16 - When a large volume of air is needed at a...Ch. 16 - Prob. 8RQCh. 16 - Prob. 9RQCh. 16 - An analog control signal A. has an infinite number...
Ch. 16 - Another term used to describe sensitivity in...Ch. 16 - Prob. 12RQCh. 16 - Prob. 13RQCh. 16 - One of the major components of a residential...Ch. 16 - Prob. 15RQCh. 16 - Describe a control device, and give three examples...Ch. 16 - Describe what a sensor does in a DDC system used...Ch. 16 - What is the difference between an active and a...Ch. 16 - A control system consists of what three basic...Ch. 16 - List six advantages that DDC control systems have...Ch. 16 - Describe the difference between the analog and...Ch. 16 - Describe the difference between an open-loop and a...
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