barcode in rdlc A chiller is part of a(n)___________ a evaporator c compressor b d condenser none of the above in .NET

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A chiller is part of a(n)___________ a evaporator c compressor b d condenser none of the above
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The dehydrator removes ___________ and noncondensable gases a water c air b d humidity none of the above
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The term bleed off means: a a continuous or intermittent wasting of a small fraction of circulating water to prevent the buildup and concentration of scale-forming chemicals in the cooling tower system b draining off part of the tower water c removing contaminated water d removing refrigerant
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In designing a cooling tower, the tower should be rated at the same ton-capacity as the ___________ a condenser c compressor e none of these b d evaporator all of these
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Atmospheric towers are relatively ___________ a expensive c sturdy b d inexpensive low maintenance
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Cooling and Distribution Systems
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The ___________ cooler is one of the most efficient systems for industrial and HVAC applications a water c fluid b d refrigerant air
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The cooling tower is a specialized heat ___________ a exchanger c generator b d cooler eliminator
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Mechanical-draft towers are categorized as either forced-draft or ___________- draft towers a unforced c natural b d induced horizontal
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Usually forced-draft tower are equipped with centrifugal ___________ -type fans a suction c star-wound b d wound blower
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The fluid cooler uses a ___________ induced draft a naturally c mechanically b d pumpclosed-loop-
The ___________ has jurisdiction over water supply and protection in water-cooling towers a International Plumbing Code b International Mechanical Code c International Fuel Gas Code d International Building Code
The ___________ has jurisdiction over heat-exchange equipment that contains a refrigerant which is flammable, combustible, or hazardous a International Fire Code b International Building Code c International Fuel Gas Code d International Mechanical Code
Plume discharges from cooling towers must be located to prevent the discharge-vapor plumes from entering occupied spaces Plume discharges shall not be less than ___________ feet above or 20 feet away from any ventilation inlet to a building a 10 c 5 b d 20 30
HVAC Licensing Exam Study Guide
TRUE-FALSE EXAM
The condenser is a heat-transfer device True False Heat given up by the refrigerant vapor to the condensing medium includes both the heat absorbed in the evaporator and the heat of compression True False The larger the condenser area exposed to the moving airstream, the higher the temperature of the refrigerant when it leaves the condenser True False To exhaust the heat without causing the area being cooled to heat up again, it is common practice to locate the condenser outside the area being conditioned True False Air-cooled condensers that use fans are classified as chassis-mounted and remote True False Water is used to cool condensers True False There are four of water-cooled condensers True False The shell-and-coil condenser is made by placing a bare or finned tube inside a steel shell True False Chillers are used to cool water or brine True False In chillers the cooled liquid refrigerant in the economizer is metered through the high-side valve chamber into the cooler True False In chillers the oil pump and oil reservoir are contained within the unit shell True False Cooling towers are used to conserve or recover water True False
Cooling and Distribution Systems
Drift is the small amount of water lost in the form of fine droplets retained by the circulating air True False Bleed-off is the continuous or intermittent wasting of a small fraction of circulating water to prevent the buildup and concentration of scale-forming chemicals in the water True False The fluid cooler is one of the most efficient systems for industrial HVAC applications True False
HVAC Licensing Exam Study Guide
MULTIPLE-CHOICE ANSWERS 1 2 3 4 5 6 A D B A C D 7 8 9 10 11 12 C A C A B A 13 14 15 16 17 18 A D A C D B 19 20 21 22 23 24 A A A B C A 25 26 27 28 29 30 B D C A A C
TRUE-FALSE ANSWERS 1 2 3 4 T T F T 5 6 7 8 T T F T 9 10 11 12 T F T T 13 T 14 T 15 T
Part D
REFRIGERATION
HVAC Licensing Study Guide
Copyright 2007 by The McGraw-Hill Companies, Inc Click here for terms of use
NOTES
8
REFRIGERATION EQUIPMENT AND PROCESSES
HVAC Licensing Study Guide
Copyright 2007 by The McGraw-Hill Companies, Inc Click here for terms of use
HVAC Licensing Exam Study Guide
WORKING WITH WATER-COOLING PROBLEMS Three-fourths of the earth s surface is covered with water The earth is blanketed with water vapor, which is an indispensable part of the atmosphere Heat from the sun shining on oceans, rivers, and lakes evaporates some water into the atmosphere Warm, moisture-laden air rises and cools The cooling vapor condenses to form clouds Wind currents carry clouds over land masses where the precipitation may occur in the form of rain, snow, or sleet Because of the sun and upper-air currents, this process is repeated again and again Pure water has no taste and no odor Pure water, however, is actually a rarity All water found in oceans, rivers, lakes, streams, and wells contains various amounts of minerals picked up from the earth Even rainwater is not completely pure As rain falls to earth, it washes from the air various gases and solids such as oxygen, carbon dioxide, industrial gases, dust, and even bacteria Some of this water sinks into the earth and collects in wells or forms underground streams The remainder runs over the ground and finds its way back into various surface-water supplies Water is often referred to as the universal solvent Water runs over and through the earth and mixes with many minerals Some of these mineral solids are dissolved or disintegrated by water Pure water and sanitary water are the same as far as municipalities are concerned Pure in this case means that the water is free from excessive quantities of germs and will not cause disease Mineral salts or other substances in water do not have to be removed by water-treatment plants unless they affect sanitary conditions Mineral salts are objectionable in water used for many other purposes These uses include generating power, heating buildings, processing materials, and manufacturing Water fit for human consumption is not necessarily acceptable for use in boilers or cooling equipment Water is used in many types of cooling systems Heat removal is the main use of water in air conditioning or refrigeration equipment Typical uses include once-through condensers, open recirculating cooling systems employing cooling towers, evaporative condensers, chilled-water systems, and air washers In evaporative condensers, once through systems and cooling towers, water removes heat from a refrigerant and then is either wasted or cooled by partial evaporation in air Knowledge of impurities in water used in any of these systems aids in predicting possible problems and methods of preventing them Cooling towers are usually remotely located; it becomes necessary to regularly inspect and clean the tower according to the manufacturer s recommendation The few hours each month spent on inspecting the cooling tower and maintaining it will pay dividends The life of a tower varies according to: Construction materials Location within the system Location of the city or country
Generally, the premium materials of construction are: Wood Concrete Stainless steel Fiberglass
These units are expected to last from 20 to 30 years if properly cared for The less expensive units, made of galvanized steel, will operate for 8 to 20 years Of course, tower life will vary due to the extremes of weather, number of hours used each year, and type of water treatment It is sufficient to say that in order to get the most use from the tower, cooling tower manufacturers want to make that tower last as long as possible
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