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 19, Problem 10RQ
To determine
The reason for not filing or sanding the contactor contacts.
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A long wire (k-8 W/m °C.) with ro 5 mm and surface temperature Ts=180°C
as shown in Fig.2. Heat is generated in the wire uniformly at a rate of 5 x107 W/m³. If the
energy equation is given by:
d
11(77) + -
=0
k
r dr dr
Derive an expression for T(r) and determine the temperature at the center of the wire and
at r=2 mm.
Air
Th
T
KA
LA
T2 T3 T
Fig.1
KB kc
180°C
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Fig.2
B:
Find the numerical solution for the 2D equation below and calculate the temperature values for
each grid point shown in Fig. 2 (show all steps).
(Do only one trail using following initial values and show the final matrix)
T₂
0
T3
0
I need a real solution, not artificial intelligence
loc
Can I solve this problem by calculating the initial kinetic energy with respect to G instead of A.
Chapter 19 Solutions
Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrigeration and Air Conditioning Technology, 8th
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- A cylindrical specimen of aluminum is pulled in tension. Use the stress v. strain plot below for this specimen of Al to answer parts (a) - (f). Hint: Each strain increment is 0.004. Be sure to include your engineering problem solving method per the class rubric. 400 350 300 250 Stress (MPa) 200 150 100 50 Aluminum (Stress v. Strain) 0 0 0.02 0.04 0.06 0.08 Strain 0.1 0.12 0.14 0.16 a. Compute the modulus of elasticity. b. Determine the yield strength at a strain offset of 0.002. c. Determine the tensile strength of this metal. d. Compute the ductility in percent elongation. e. Compute the modulus of resilience. f. Determine the elastic strain recovery for an unloaded stress of 340 MPa.arrow_forwardConsider a single crystal of silver oriented such that a tensile stress is applied along a [112] direction. If slip occurs on a (011) plane and in a [111] direction and is initiated at an applied tensile stress of 15.9 MPa, compute the critical resolved shear stress.arrow_forwardA hypothetical component must not fail when a tensile stress of 15.25 MPa is applied. Determine the maximum allowable internal crack length if the surface energy of the component is 1.50 J/m2. Assume a modulus of elasticity of 350 GPa.arrow_forward
- Fresh air at 21.1 C in which partial pressure of water vapor is 0.018 atmosphere is blown at the rate of 214 m3/h first through a preheater and then adiabatically saturated in spray chambers to 100% saturation and again reheated this reheated air has humidity of 0.024 kg water vapor per kg dry air. It is assumed that the fresh air and the air leaving the re-heater have the same percentage humidity. Determine:- a- The temperature of preheater, spray-chamber and re-heater b- Heat requirement for preheating and re-heating 11:39 مarrow_forwardThe answer to the problem is 7.24 N. Please show me how to get the final answerarrow_forwardThe answer to the problem is 17.9N. Please show me how to get the final answerarrow_forward
- The answer to the problem is 2.93 ft/s. Please show me how to get the final answerarrow_forwardExample(3): 0.15 kg/s steam at atmospheric pressure and superheated to 400 K is bled into an air stream at 320 K and 20 per cent relative humidity. What is the temperature, enthalpy, and relative humidity of the mixed stream if the air is flowing at 5 kg/ s? How much steam would be required to provide an exit temperature of 330 K and what would be the humidity of this mixture? 11:39 مarrow_forwardThe answer to the problem is 31.3rad/s. Please show me how to get the final answerarrow_forward
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