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frost
Frost is a thin layer of ice on a solid surface, which forms from water vapor in an above-freezing atmosphere coming in contact with a solid surface whose temperature is below freezing, and resulting in a phase change from water vapor (a gas) to ice (a solid) as the water vapor reaches the freezing point. In temperate climates, it most commonly appears on surfaces near the ground as fragile white crystals; in cold climates, it occurs in a greater variety of forms. The propagation of crystal formation occurs by the process of nucleation.
The ice crystals of frost form as the result of fractal process development. The depth of frost crystals varies depending on the amount of time they have been accumulating, and the concentration of the water vapor (humidity). Frost crystals may be invisible (black), clear (translucent), or white; if a mass of frost crystals scatters light in all directions, the coating of frost appears white.
Types of frost include crystalline frost (hoar frost or radiation frost) from deposition of water vapor from air of low humidity, white frost in humid conditions, window frost on glass surfaces, advection frost from cold wind over cold surfaces, black frost without visible ice at low temperatures and very low humidity, and rime under supercooled wet conditions.Plants that have evolved in warmer climates suffer damage when the temperature falls low enough to freeze the water in the cells that make up the plant tissue. The tissue damage resulting from this process is known as "frost damage". Farmers in those regions where frost damage is known to affect their crops often invest in substantial means to protect their crops from such damage.
Evening all,
Have been asked to wire one of these into a heating system that has no separate control (or valves) for HW & CH. Customer is going to be away and wants it wiring in to allow the heating to only come on when the temp drops to keep pipes etc from freezing...
Iam looking for help to connect a frost stat to an S plan system.
My question is : when there are two zone valves present, one for up and one for down.
Will it matter which I connect to when the frost stat fires up?
Thanks
At our church, one of the things I've done is sort out the heating wiring (as best I can for now). The schematic is as shown below.
The theory that had me arrive at this goes :
Previously, when the wall stats was satisfied, the pump stopped along with the boiler. As we have a number of...
Hi,
Last year we had a burst pipe in the loft - made a heck of a mess!
I would like to try and get some frost protection up in the loft.
Originally I was thinking of some trace heating cables but having been up there I can see there are a lot of pipes! They are all insulated with 20-30mm foam...
Have anyone had any problems with self regulating heat cable. I installed frost protection cable on to a water pipe that was feeding water troughs in a slatted cow shed. The customer went nuts when the water pipe burst. The tee joint that i had installed had failed and disintegrated, must have...
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