The portion of the atmosphere from the earth’s surface to the tropopause, i.e., the lowest 10 to 20 kilometers of the atmosphere. It is characterized by decreasing temperature with height, appreciable vertical wind motion, appreciable water vapor content, and variable weather.
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SKIN CONDENSER
Condenser using the outer surface of the cabinet as the heat radiating medium.
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AIR COOLER
A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.
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ABRASION RESISTANCE
The ability of a material to resist surface wear.
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CUTTING WEAR
Comes about when hard surface asperities or hard particles that have embedded themselves into a soft surface and plough grooves into the opposing harder surface, e.g., a journal.
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ADHESIVE WEAR
Often referred to as galling, scuffing, scoring, or seizing. It happens when sliding surfaces contact one another, causing fragments to be pulled from one surface and to adhere to the other.
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CLEAN ROOM
A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.
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JOURNAL BEARING
A sliding type of bearing having either rotating or oscillatory motion and in conjunction with which a journal operates. In a full or sleeve type journal bearing, the bearing surface is 360° in extent. In a partial bearing, the bearing surface is less than 360° in extent, i.e., 150°, 120°, etc.
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ABSOLUTE ZERO TEMPERATURE
Temperature measured from absolute zero (-459.67°F, or -273.16°C).
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AIR REHEATING
In an air conditioning system, the final step in treatment, in the event the temperature is too low.
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CLOUD POINT
The temperature at which waxy crystals in an oil or fuel form a cloudy appearance.
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