The increase of temperature caused by absorption of heat or internal generation of heat, as by hydration of cement in concrete. See hydration and heat of hydration.
The temperature increase over ambient due to load. This is measured as either average rise by resistance or as hot-spot.
Measure of the heat generated by a unit at a given ambient temperature. See also Ambient Temperature.
The amount of temperature difference between incoming and outgoing water (in degrees F) that the water heating system must apply to the water being heated.
Some of the electrical energy losses inherent in motors are converted to heat causing some of the motor parts to heat up when the motor is running. The heated parts are at a higher temperature than the air surrounding them thereby causing a rise above room (ambient) temperature. It is important to match the proper motor and insulation system (NEMA temp. codes) to the appropriate ambient temperature. If a motor has been built with greater than 1.0 service factor then it can run at a temperature some what higher than the motor's rated operating temperature. In all cases, the actual insulation thermal capability usually is higher than the motor's operating temperature to allow for any excessive heat areas. This is called hot spot allowance. (See Insulation Systems for NEMA standard temperature codes.) Each temperature code has an associated temperature rise which when added to the ambient and hot spot should not exceed the temperature handing of the insulation system.
The increase of concrete temperature caused by heat of hydration and heat from other sources.
The temperatures increase over ambient due to load.
The temperature degrees, above its surroundings, at which motor is operating. Check motor nameplate for ambient rating.
The amount, by which a motor operating under rated conditions, is hotter than its surrounding ambient temperature.