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.

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.
References in periodicals archive ?
Whey protein isolate was dissolved at 1% or 2% in deionized water and adjusted to pH 7, 9 and 11 in preparation for preheating at 138 C for up to 20 minutes.
Productivity in selective soldering is, or has been, the combined processes of fluxing, preheating and soldering.
The principle of green coffee preheating: Prior to the actual roasting process, the green coffee batch is heated to a temperature of just under or around 100[degrees]C in a preheating chamber before it is fed into the roasting chamber.
In the case of wet flux, it is advisable to position this system as a first preheating unit.
For the unfilled systems, the throughput increase due to preheating can easily be calculated.
Other products include battery and cabin preheaters, aircraft covers and related preheating accessories.
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.
Plants preheating ingot in this manner usually stipulate that the ingot be placed on the ledge "skim side down" to avoid condensation puddling in the shrinkage cavity [ILLUSTRATION FOR FIGURE 2 OMITTED].
That savings more than offsets the energy expenditure for preheating, Shorr claims.
It includes two three-axis robots on a single boom for parts removal, degating, and stacking; a mobile mold changer with preheating and service stations; mold-storage racks; automated materials handling; a two-material injection machine; and the "double" hot-runner system that accommodates two materials.
Preheating began last July, and is proving beneficial in two aspects.