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 8, Problem 19RQ
Describe the meaning of a deep vacuum, and explain why it is important to reach and hold a deep vacuum when pulling a vacuum on a system.
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Chapter 8 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 8 - The low-pressure side of the system must not be...Ch. 8 - Name and briefly describe the six classes of...Ch. 8 - The ________is both the greatest asset and the...Ch. 8 - Why should oxygen or compressed air never be used...Ch. 8 - List some of the foreign matter that may enter a...Ch. 8 - True or False: A vacuum pump can remove any type...Ch. 8 - Air in a refrigeration system causes which of the...Ch. 8 - The only two products that should be circulating...Ch. 8 - In order to remove moisture from a refrigeration...Ch. 8 - Are the best vacuum pumps one-stage or two-stage?
Ch. 8 - Name the two types of vacuum procedures used by...Ch. 8 - What can be done to get water out from under the...Ch. 8 - When evacuating a refrigeration system that has...Ch. 8 - What is today's most accurate type of deep vacuum...Ch. 8 - _________microns are in 1 inch.Ch. 8 - Briefly describe the method for cleaning up a...Ch. 8 - What is the advantage of using large gauge lines...Ch. 8 - Why is it important to change the oil on a vacuum...Ch. 8 - Describe the meaning of a deep vacuum, and explain...Ch. 8 - List the main advantages of a microfoam leak...Ch. 8 - What could an oily dust spot on a condenser or...Ch. 8 - Why should a condenser be covered with a sheet...Ch. 8 - Leaks that occur only when the unit is in...Ch. 8 - Briefly describe a combination-dependent leak.
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- Vacuum is defined as the absence ofarrow_forward4.a. You can usually check for a leak in a vacuum system by looking at or feelingA. at the vacuum gauge at the vacuum pump.B. for signs of dirt on the piping.C. at the exhaust of the vacuum pump. 4.b. When a pneumatic solenoid fails, the failure is normally due to aB. weak pilot.C. bad spool.D. ripped seal.arrow_forwardProblem 4 HIN 4. Both V₁ and V₂ not actuated The pneumatic system shown contains a double-rod cylinder controlled by two three-way, two-position directional control valves. In each of the following cases, what is the behavior of the cylinder? 1. Only V₁ is actuate 2. Only V₂ is actuate 3. Both V₁ and V₂ actuated a. -5 psig b. A perfect vacuum Assume a factor of safety of 2.5 Figure for Problem 4 Problem 5 How heavy an object can be lifted with a suction cup having a lip with a 8-in outside diameter and a 6.5-in inside diameter if the vacuum pressure is Problem 6 A pneumatic vacuum lift system has a total volume of 15 ft³ inside the cup and associated pipeline leading to the vacuum pump. The vacuum pump produces a flow rate of 3 scfm when turned on. The desired suction pressure is 5 psia and atmospheric pressure is 29.5 in Hg abs. Determine the time required to achieve the desired suction pressure. (Hint: 30 inHg = 14.7 psia)arrow_forward
- which of the following describe/s a manometers? a. Instruments that are used to monitor pressure with high precision b. In certian cases, manometers may be configured to measure a variety of various pressure levels. c. All manometers are based on the premise that changes in pressuer will cause a liquid to rise or fall in a tube when the pressure is changed. d. U-tube manometer as it is probably the most common manometer in use today.arrow_forwardChoose one appropriate application for corrective maintenance and one for preventive/predictive maintenance for your system. Product: Self-guided vacuumarrow_forwarda. Mention any four primary transducers involved in the measurement of pressure. b. Explain the measurement of pressure using Bourdon tube with neat diagram.arrow_forward
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