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Chillers (Compressors & Liquid Coolers) ACROSS 1. In a positive-_ _ _ _ _ _ _ _ _ _ _ _ compressor, the pressure of the refrigerant vapor is increased by reducing the volume of the compression chamber. 6. The “X” in the acronym “DX.” Refrigerant evaporates inside the tubes of this type of cooler. 8. Most compressors discharge a small percentage of this fluid into the discharge gas and it mixes with the condensed refrigerant in the condenser then flows to the cooler where it may collect if the gas velocity in the tubes and the suction gas header is not sufficient to carry it from the cooler into the suction line. 10. This is the result of design compromises involving physical limitations of the refrigerant, compressor, and motor while attempting to accomplish certain criteria in the design of a compressor. 11. This organization publishes Standard 575-87: “Method of measuring machinery sound within an equipment space.” 14. The COP for a hermetic compressor is calculated by dividing this by the input power to the motor. 17. Almost all the common metals and alloys are used satisfactorily with these types of refrigerants; however, there are a few exceptions to the rule as noted in the 1996 ASHRAE Systems and Equipment Handbook. 18. This efficiency is one factor that
should be considered for ideal capacity modulation for any compressor. 20. This efficiency is the ratio of actual volume of gas entering a compressor to the theoretical displacement of the compressor.
DOWN 2. This type of heat exchanger is the most common wherein a series of baffles channels the fluid throughout the shell side as refrigerant flows through the tube side. 3. These types of compressors are sometimes called turbocompressors. 4. The centrifugal _ _ _ _ _ _ _ _ _ _ replaces the force of gravity in a flash-type _ _ _ _ _ _ _ _ _ _ with centrifugal force to separate the flash gas generated at an inter- mediate pressure from the liquid refrigerant prior to liquid entering the evaporator. 5. This factor takes into account that most fluids, over time, foul the fluid-side heat transfer surface, thus reducing the overall heat transfer coefficient of the cooler. 7. This type of compressor is one in which the motor and compressor are contained within the same housing. 9. The pressure of this vapor increases in dynamic compressors due to a continuous transfer of angular momentum from the rotating member to the vapor followed by the conversion of this momentum into a pressure rise. 12. Along with the discharge valve,
this is one of the most important valves in a reciprocating compressor. 13. This should be installed on a cooler operating at a saturated suction tem- perature lower than the dewpoint of the surrounding air to prevent condensation. 15. This design variable should, at a mini- mum, be at the saturation point for the refrigerant used at 80A?F per ANSI/ ASHRAE Standard 15. 16. Although this term isn’t used in the two reference ASHRAE chapters, this is the term that manufacturers and specifiers typically use to describe the piece of equipment that combines compressors, condensers, and a liquid cooler heat exchanger into one unit. 19. This organization publishes the “Rules for Construction of Pressure Vessels,” Section VIII-95 of the Boiler and Pressure Vessel Code.
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