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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Textbook Question
Chapter 14, Problem 1RQ
Why is a low-voltage thermostat normally more accurate than a high-voltage thermostat?
Expert Solution & Answer
To determine
The reason for high accuracy of low voltage thermostat then high voltage thermostat.
Explanation of Solution
Thermostat:
Thermostat is an electronic device which used to sense the temperature of physical system.
Thermostat is of two types.
- Low voltage thermostat
- High voltage thermostat
Low voltage thermostat:
Low voltage thermostat operating voltage is
Generally low voltage thermostat is Powered by step down transformer.
It is used in electric furnaces, single stage heat pump and multistage heating and cooling heat pumps.
High voltage thermostat:
High voltage thermostat operating voltage is
It is used in wall mounted mini split system, baseboard heaters, single zone system, electric space heaters.
The response of high voltage thermostat which contains a large bimetal would be slow to the air temperature changes thus, low voltages controls are more efficient than high voltage thermostat.
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Procedure:1- Cartesian system, 2D3D,type of support2- Free body diagram3 - Find the support reactions4- If you find a negativenumber then flip the force5- Find the internal force3D∑Fx=0∑Fy=0∑Fz=0∑Mx=0∑My=0\Sigma Mz=02D\Sigma Fx=0\Sigma Fy=0\Sigma Mz=05- Use method of sectionand cut the elementwhere you want to find
Procedure:1- Cartesian system, 2D3D,type of support2- Free body diagram3 - Find the support reactions4- If you find a negativenumber then flip the force5- Find the internal force3D∑Fx=0∑Fy=0∑Fz=0∑Mx=0∑My=0\Sigma Mz=02D\Sigma Fx=0\Sigma Fy=0\Sigma Mz=05- Use method of sectionand cut the elementwhere you want to findthe internal force andkeep either side of the
Procedure:
1- Cartesian system, 2D3D,
type of support
2- Free body diagram
3 - Find the support reactions
4- If you find a negative
number then flip the force
5- Find the internal force
3D
∑Fx=0
∑Fy=0
∑Fz=0
∑Mx=0
∑My=0
ΣMz=0
2D
ΣFx=0
ΣFy=0
ΣMz=0
5- Use method of section
and cut the element
where you want to find
the internal force and
keep either side of the
Chapter 14 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
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