barcode generator source code in javascript Equipment: Part 1 Equipment: Part 1 295 in Software

Drawing QR-Code in Software Equipment: Part 1 Equipment: Part 1 295

Equipment: Part 1 Equipment: Part 1 295
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Figure 97 Principle of operation
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of a single-screw compressor (SOURCE: Copyright 1988, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc, wwwashrae org Reprinted by permission from ASHRAE Handbook, 1988 Equipment, Chap 12, Fig 11)
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Centrifugal compressors
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Centrifugal compressors belong to the family of turbomachines, which includes fans and centrifugal pumps Pressures and ows result from rotational forces In HVAC work, these compressors are used primarily in package chillers where the compressors provide large capacities Typical driven speed is 3600 r/min or more, using electric motor engines or steam or gas turbines Standard centrifugal chillers range in capacity from 100 to 2000 tons, although some special units have been built with capacities as great as 8500 tons Capacity control is obtained by varying the driven speed or by means of inlet vanes, similar to those used on centrifugal fans Noncondensing air-cycle systems, such as used on commercial aircraft, use high-speed gas-turbine drives at up to 90,000 r/min
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935 Hermetic compressors
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Compressors may be built in either hermetic or open con gurations A hermetic unit has a casing which encloses both the compressor and the drive motor, minimizing the possibility of refrigerant leakage Motors are specially constructed and are normally cooled with suction gas or with liquid refrigerant In an open machine, the drive motor or turbine is separate from the compressor Shaft seals must be provided to prevent refrigerant leakage Standard drives direct, gear, or
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Figure 98 Helical rotary twin-
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screw compressor (SOURCE: Copyright 2000, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc, wwwashraeorg Reprinted by permission from ASHRAE Handbook, 2000 HVAC Systems and Equipment, Chap 34, Fig 24)
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Equipment: Part 1 296 Nine
belt may be used Semihermetic units have separate casings for the compressor and the motor with matching anges for gas-tight assembly Open drives have the advantage of removing the motor heat from the refrigeration cycle, thereby improving chiller performance This advantage is lost if the motor heat is picked back up into the cooling load indirectly 94 Chillers
The term chiller is used in connection with a complete chiller package which includes the compressor, condenser, evaporator, internal piping, and controls or for a liquid chiller (evaporator) only, where the water or brine is cooled Liquid chillers come in two general types: ooded and directexpansion There are several different con gurations: shell-and-tube, double-tube, shell-and-coil, Baudelot (plate-type), and tank with raceway For HVAC applications, the shell-and-tube con guration is most common
941 Flooded chillers
A typical ooded shell-and-tube liquid chiller is shown in Fig 99 Refrigerant ow to the shell is controlled by a high- or low-side oat valve or by a restrictor The water ow rate through the tubes is de ned by the manufacturer but it generally ranges from 6 to 12 ft/s Tubes may be plain (bare) or have a nned surface The two-pass arrangement shown is most common, although one to four passes are available The chiller must be arranged with removable water boxes so that the tubes may be cleaned at regular intervals, because even a
Figure 99 Flooded liquid chiller
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Equipment: Part 1 Equipment: Part 1 297
small amount of fouling can cause a signi cant decrease in the heat exchange capacity The condenser water tubes are especially subject to fouling with an open cooling tower Piping must be arranged to allow easy removal of the water boxes
942 Direct expansion (DX) chillers
In the DX liquid chiller (Fig 910), the refrigerant is usually inside the tubes with the liquid in the shell Baf es are provided to control the liquid ow The U tube con guration shown is typical and less expensive than the straight-through tube arrangement but can lead to problems with oil accumulation in the tubes if refrigerant velocities are too low Refrigerant ow is controlled by a thermal expansion valve
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