You will think i am stupid but?

[young plum]

As you know i am at college and passed all exams up to now on nvq lev 2 just started learning central heating and i cant get my head around it, I dont understand how it works with a f&e tank then into cylinder does cold water enter at the bottom or top off the cylinder please help its hard to understand on a black board

 

[joe-90]

It goes in at the bottom and is drawn off at the top. Just as hot air rises - so does hot water. The hot water is replaced by cold from below when the hot is taken from the top. That's why water runs cooler and cooler as more is drawn off.



joe

 

[ArtfulBodger]

It goes in at the bottom and is drawn off at the top. Just as hot air rises - so does hot water. The hot water is replaced by cold from below when the hot is taken from the top. That's why water runs cooler and cooler as more is drawn off.



joe

I didn't think the cold permeated the hot that much. I was under the impression that there was a pretty well defined layer of hot & cold. Am I being daft?

 

[leakydave]

technically f&e tank supplies heating system (small tank), CWSC (Cold Water Storage Cistern) feeds cylinder at bottom. As water in cylinder is heated it rises to the top, where it flows out of the top to hot taps, being replaced by more cold at the bottom from the tank.
That is why heating coil is near bottom to heat colder water, and thermostat is 1/3 way up cylinder to gauge temp of cooler water

 

[PaulAH]

Young Plum, well done on getting your level 2. You are obviously keen to learn so I suggest that you collar your tutor whenever you can and get him/her to explain things more thoroughly.

If you really have got as far as level 2 without being shown basic principles like hot water rising above cold, something is badly wrong. Once you understand the principles, everything else falls naturally into place and becomes easier to learn. There are plenty of books on elementary physics that will help you.

Good luck.