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A chemical reaction that will generate heat to produce a higher temperature.

Related Terms

SKIN CONDENSER

Condenser using the outer surface of the cabinet as the heat radiating medium.

COMPOUND

(1) chemically speaking, a distinct substance formed by the combination of two or more elements in definite proportions by weight and possessing physical and chemical properties different from those of the combining elements. (2) in petroleum processing, generally connotes fatty oils and similar materials foreign to petroleum added to lubricants to impart special properties.

REFRIGERATING CAPACITY

The ability of a system to remove heat as compared with the cooling effect produced by melting of ice.

CORROSION INHIBITOR

Additive for protecting lubricated metal surfaces against chemical attack by water or other contaminants. There are several types of corrosion inhibitors. Polar compounds wet the metal surface preferentially, protecting it with a film of oil. Other compounds may absorb water by incorporating it in a water-in-oil emulsion so that only the oil touches the metal surface. Another type of corrosion inhibitor combines chemically with the metal to present a non- reactive surface.

CRACKING

The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.

ADIABATIC PROCESS

A thermo-dynamic process in which no heat is extracted from or added to the system of the process.

REFRIGERATOR

A device to transfer heat from a low temperature to a high temperature medium.

COOLANT

A fluid used to remove heat. See Cutting fluid.

False brinelling

False brinelling of needle roller bearings is actually a fretting corrosion of the surface since the rollers are the I.D. of the bearing. Although its appearance is similar to that of brinelling, false brinelling is characterized by attrition of the steel, and the load on the bearing is less than that required to produce the resulting impression. It is the result of a combination of mechanical and chemical action that is not completely understood, and occurs when a small relative motion or vibration is accompanied by some loading, in the presence of oxygen.

HEAT EXCHANGER

A device which transfers heat through a conducting wall from one fluid to another.
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