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HVAC 1000-01 quiz 2
Definition
Question | Answer |
---|---|
Clearance Volume | The volume at the top of the stroke in a reciprocating compressor cylinder between the top of the piston and the valve plate |
Back Pressure | The pressure on the low-pressure side of a refrigeration system (also known as suction pressure) |
Gasket | A thin piece of flexible material used between two metal plates to prevent leakage |
Discus Valve | A reciprocating compressor valve design with a low clearance volume and larger bore |
External Drive | An external type of compressor motor drive, as opposed to a hermetic compressor |
Cooling Tower | The final device in many water-cooled systems, which rejects heat from the system into the atmosphere by evaporation of water |
Compressor | A vapor pump that pumps vapor (refrigerant or air) from one pressure level to a higher pressure level |
Accumulator | A storage tank located in the suction line of a compressor. It allows small amounts of liquid refrigerant to boil away before entering the compressor. |
Evaporator | The component in a refrigeration system that absorbs heat into the system and evaporates the liquid refrigerant |
End Bell | The end structure of an electric motor that normally contains the bearings and lubrication system |
Liquid Line | A term applied in the industry to refer to the tubing or piping from the condenser to the expansion device |
Condensing Unit | A complete unit that includes the compressor and the condensing coil |
Charge | The quantity of refrigerant in a system. |
Crankshaft Seal | Same as the compressor shaft seal. |
Flooding | The term applied to refrigeration system when the liquid refrigerant reaches the compressor |
Drier | A device used in a refrigerant line to remove moisture |
High Side | A term used to indicate the high-pressure or condensing side of the refrigeration system |
Condenser | The component in a refrigeration system that transfers heat from the system by condensing refrigerant |
Desiccant | Substance in a refrigeration system drier that collects moisture |
Centrifugal Compressor | A compressor used for large refrigeration systems that uses centrifugal force to accomplish compression. It is not positive displacement, but it is similar to a blower |
Air Heat Exchanger | A device used to exchange heat between air and another medium at different temperature levels, such as air-to-air, air-to-water, air-to-refrigerant |
Eccentric | An off-center device that rotates in a circle around a shaft |
Head | Another term for pressure, usually referring to gas or liquid |
Gauge Manifold | A tool that may have more than one gauge with valve arrangement to control fluid flow. |
Contaminant | Any substance in a refrigeration system that is foreign to the system, particularly if it causes damage |