Term
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Definition
| The weight of water vapor in a given amount of air. |
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Term
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Definition
| Pressure measured with the base of zero. |
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Term
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Definition
| A temperature scale expressed in degrees ℉ or ℃. |
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Term
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Definition
| The temperature at which molecular activity theoretically ceases. -456.69℉ or -273.16℃ or 0° Rankine(F) or 0°Kelvin. |
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Term
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Definition
| The process of controlling the temperature, humidity, cleanliness and distribution of the air. |
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Term
| AIR STANDARD CONDITIONS (70°@50% RH SEA LEVEL 14.696 PSI |
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Definition
| Conditions at which capacity ratings for air conditioning equipment is rated. |
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Term
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Definition
| Refers to the temperature surrounding a body or unit under test. |
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Term
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Definition
| The weight of a 1 unit column of the earths atmosphere. |
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Term
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Definition
| Two metals with different rates of expansion fastened together. When heated or cooled they will warp and can be made to open or close a switch or valve. |
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Term
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Definition
| The temperature at which the addition of any heat will begin a change of state from a liquid to a vapor. |
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Term
| BRITISH THERMAL UNIT (BTU) |
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Definition
| The amount of heat necessary to change the temperature of 1 pound of pure water 1 degree Fahrenheit (℉). |
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Term
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Definition
| A temperature scale with the freezing point of water 0℃ and the boiling point 100℃ at sea level. |
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Term
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Definition
| A valve designed to permit flow in one direction only. |
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Term
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Definition
| The reduction of volume of a vapor or gas by mechanical means. |
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Term
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Definition
| The ratio determined by dividing the discharge pressure, in PSI (Pa), by the suction pressure in PSI (Pa). |
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Term
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Definition
| A mechanical device used to compress gases. Three main types- reciprocating, centrifugal and rotary. |
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Term
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Definition
| The temperature at which the removal of any heat will begin a change of state from a vapor to a liquid. |
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Term
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Definition
| The substance, usually air or water, to which the heat in a condenser is transferred. |
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Term
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Definition
| The portion of a refrigeration system where the compression and condensation of refrigerant is accomplished. Sometimes referred to as the 'high side'. |
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Term
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Definition
| The transfer of heat from molecule to molecule within a substance. |
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Term
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Definition
| The transfer of heat by a moving liquid. |
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Term
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Definition
| A common means of assigning quantitative values to volumes of air in transit, usually abbreviated CFM. |
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Term
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Definition
| The complete course of operation of a refrigerant back to a selected starting point in a system. |
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Term
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Definition
| The portion of a refrigeration system where the compression and condensation of refrigerant is accomplished. Sometimes referred to as the 'high side'. |
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Term
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Definition
| The transfer of heat from molecule to molecule within a substance. |
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Term
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Definition
| The transfer of heat by a moving liquid. |
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Term
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Definition
| A common means of assigning quantitative values to volumes of air in transit, usually abbreviated CFM. |
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Term
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Definition
| The complete course of operation of a refrigerant back to a selected starting point in a system. |
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Term
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Definition
| Mass or weight per unit of volume. |
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Term
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Definition
| A tube used to convey the compressed refrigerant vapor from the compressor to the condenser inlet. |
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Term
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Definition
| The pressure read at the compressor outlet. Also called head pressure or high side pressure. |
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Term
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Definition
| Air which contains no moisture vapor. |
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Term
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Definition
| Temperature read with an ordinary thermometer. |
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Term
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Definition
| An arbitrary concept which combines into a single value the effect of temperature, humidity, and air movement as sensed by the human body. |
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Term
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Definition
| Total amount of heat in one pound (kg) of a substance calculated from accepted temperature base, expressed in BTU's per pound mass (J/kg). |
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Term
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Definition
| Energy Efficient Ratio. The ratio of energy used in watts compared to the amount of heat produced or removed in BTU's. |
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