preheating


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preheating

[prē′hēd·iŋ]
(astronomy)
A scenario suggested by detailed calculations of the inflationary universe cosmology in which the order parameter, as it relaxes about a new potential minimum following inflation, exhibits vibrations that can release energy in certain nonthermal modes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

preheating

The partial heating of water in a domestic water system by circulating it through a first-stage heat exchanger before circulating it through the final heater.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Effect of Preheating Time and Oven Temperature on Stretched PP/WF Composites
Although the specimens initially were submitted to a nontraditional condition such as preheating, the main results, showed in Figure 4 and Table 1, demonstrate a small change in transformation temperatures.
However, no published studies have been reported in the area of MDF fiber mat preheating using microwave technology.
In summary, good, consistent barrel filling and top-side fillet form when selective soldering thick, heavy boards is aided by top-side preheating in combination with drop jet fluxing.
In single-screw extruders, preheating has been mentioned to solve melting problems; however, it is less common since there is the risk that the preheated pellets (including masterbatch pellets, often based on low-melting carriers) distort the solids conveying and pressure generation process based on Coulombic friction force [8, 9].
A note on automating the preheating process: Traditionally, the companies most involved in dielectric preheating have used people to place the material in the oven, start the oven, and move the heated material from the oven to the press.
For this reason, we often find selective soldering machines equipped with a preheating module that applies heat to the top side of the PCB during soldering.
There was no denying it; preheating from the topside made a huge impact on hole fill.
Electric infrared ovens used for preheating material prior to forming.
Preheating filters also has become a well-known practice for trying to control thermal shock.
Capable of pressures up to 10,000 psi, the Force 10 requires no preheating of materials.