| Terms |
Página 11 de 12 Thermometer: An instrument used to detect differences in the level of heat. Thermostat: A device that senses temperature change and changes some dimension or condition within two control and operating device. Thermostatic expansion valve (TXV): A valve used in refrigeration systems to control the superheat in an evaporator by metering the correct refrigerant flow to the evaporator. Three phase power: A type of power supply usually used for operating heavy loads. It consists of the three sine waves that are out of phase with which other. Tons of refrigeration: 12,000 Btu/hr, or 200 Btu per minute. Total heat: The total amount of sensible heat and latent heat contained in a substance from a reference point. Transformer: A coil of wire wrapped around an iron core that induces a current to another coil of wire wrapped around the same iron core. Vacuum: The pressure range between the earth atmosphere and no pressure, normally expressed in inches of mercury (in.Hg) vacuum pump. Vacuum pump: A pump used to remove some fluids such as air and moisture from a system at a pressure below the earth''s atmosphere. Vapor: The gaseous state of a Vaporization: The changing of liquid to a gas or vapor Velocity meter: A meter used to detect the velocity of fluids, air, or water. Volt-ohm-milliammeter ( VOM): A multimeter that measures voltage, resistance, and current in milliamperes Voltage: The potential electrical difference for electron flow from one line to another in an electrical circuit |
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