Problem 1-1. Automation in daily life.
Identificaton of the M-D-A components, controller type, instrumentation diagram, and type of control.
(a) House air-conditioning/heating.
M: Temperature element TE in thermostat TE/C D: Mercury switch in thermostat TE/C A: Solenoid S that turns unit (AC/H) on and off. The controller is On/Off and the control is feedback.
TE/C S AC /H
(b) Cooking oven.
M: Temperature element TE, usually a gas-filled bulb D: Temperature controller TC. A: Solenoid S that operates the heating element in the oven The controller is On/Off and the control is feedback on the temperature variable.
SP TC TE S
M, D, A: temperature element/controller TE/C. Usually a bi-metallic strip that pushes the latch on the mechanism holding the slice of bread. The bread is released and the heating element de-energized when the temperature reaches the value set by the set point. The controller is On/Off and the control i feedback with respect to temperature.,
(d) Automatic sprinkler system for fires.
M, D, A: temperature element/controller TE/C, a rod that gives to the water pressure at a set temperature, allowing the water to spray over the fire. The controller is On/Off with single action, and the control is feedback.
(e) Automatic cruise speed control.
M: Speed sensor and transmitter ST on the transmission D: Speed controller SC A: Damper on air intake to the engine throttles the air varying the power delivered by the engine Controller is regulating and control is feedback.
SP SC ST S Air
M: temperature sensor TE, usually a gas-filled bulb D: Temperature controller C, mechanically linked to the sensor A: Solenoid S that turnsd the refrigeration compressor on and off The controller is On/Off and the control is feedback.
Excerpts from this work may be reproduced by instructors for distribution on a... [continues]
Cite This Essay
(2013, 03). Aftab. StudyMode.com. Retrieved 03, 2013, from http://www.studymode.com/essays/Aftab-1469271.html
"Aftab" StudyMode.com. 03 2013. 2013. 03 2013 <http://www.studymode.com/essays/Aftab-1469271.html>.
- MLA 7
"Aftab." StudyMode.com. StudyMode.com, 03 2013. Web. 03 2013. <http://www.studymode.com/essays/Aftab-1469271.html>.
"Aftab." StudyMode.com. 03, 2013. Accessed 03, 2013. http://www.studymode.com/essays/Aftab-1469271.html.