Automotive Technology (Custom)
6th Edition
ISBN: 9781337495356
Author: ERJAVEC
Publisher: Cengage
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Chapter 23, Problem 14RQ
When diagnosing a vacuum/
- the brake switch
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A short brass cyclinder (denisty=8530 kg/m^3, cp=0.389 kJ/kgK, k=110 W/mK, and alpha=3.39*10^-5 m^2/s) of diameter 4 cm and height 20 cm is initially at uniform temperature of 150 degrees C. The cylinder is now placed in atmospheric air at 20 degrees C, where heat transfer takes place by convection with a heat transfer coefficent of 40 W/m^2K. Calculate (a) the center temp of the cylinder, (b) the center temp of the top surface of the cylinder, and (c) the total heat transfer from the cylinder 15 min after the start of the cooling. Solve this problem using the analytical one term approximation method. (Answer: (a) 45.7C, (b)45.3C, (c)87.2 kJ)
A short brass cyclinder (denisty=8530 kg/m^3, cp=0.389 kJ/kgK, k=110 W/mK, and alpha=3.39*10^-5 m^2/s) of diameter 4 cm and height 20 cm is initially at uniform temperature of 150 degrees C. The cylinder is now placed in atmospheric air at 20 degrees C, where heat transfer takes place by convection with a heat transfer coefficent of 40 W/m^2K. Calculate (a) the center temp of the cylinder, (b) the center temp of the top surface of the cylinder, and (c) the total heat transfer from the cylinder 15 min after the start of the cooling. Solve this problem using the analytical one term approximation method.
A 6 cm high rectangular ice block (k=2.22 W/mK, and alpha=0.124*10^-7 m^2/s) initially at -18 degrees C is placed on a table on its square base 4 cm by 4cm in size in a room at 18 degrees C. The heat transfer coefficent on the exposed surfaces of the ice block is 12 W/m^2K. Disregarding any heat transfer from the base to the table, determine how long it will be before the ice block starts melting. Where on the ice block will the first liquid droplets appear? Solve this problem using the analytical one-term approximation method.
Chapter 23 Solutions
Automotive Technology (Custom)
Ch. 23 - Prob. 1RQCh. 23 - Describe telematics.Ch. 23 - What should be checked if none of the grids in a...Ch. 23 - True or False? Rain-sensitive wiper systems...Ch. 23 - What component in a wiper system makes it possible...Ch. 23 - Name the two most common problems that occur with...Ch. 23 - Prob. 7RQCh. 23 - Prob. 8RQCh. 23 - What could be the problem when the vehicles dome...Ch. 23 - Rear defrosters generally have a relay with a...
Ch. 23 - Prob. 11RQCh. 23 - Prob. 12RQCh. 23 - Which of the following parts or circuits could...Ch. 23 - When diagnosing a vacuum/mechanical cruise control...Ch. 23 - Prob. 15RQCh. 23 - Prob. 1ASRQCh. 23 - Prob. 2ASRQCh. 23 - Prob. 3ASRQCh. 23 - The reasons for slower than normal wiper operation...Ch. 23 - Prob. 5ASRQCh. 23 - Technician A says that some antitheft systems...Ch. 23 - The circuit breaker at a power seat motor...Ch. 23 - Prob. 8ASRQCh. 23 - 9. Technician A says that navigational systems...Ch. 23 - While diagnosing a cruise control system that does...
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