I an currently working on a Manchester Open Learning module. I have completed about 13 of these modules on everything from Doors and Windows to Underground Drainage and Insulation, but this one - Central Heating, has me beat! Basically I work for a Builders Merchant and these modules are basic product knowledge stuff. I have done most of this module but now I am
[i]really[/i] stuck. I have about six or seven questions and the final project to do, and I have till Nov 31st. Without help I will not do it, and I hear they charge you for non completion. [b]Can anyone here help?[/b] Many thanks.
Thanks Marrtin, OK.
Q.14 Of the consolidation is;
Explain why ferrous and non-ferrous metals are never used together in hot water installations.
Q.15 of the same section;
On a hot water installation only, state the type of cylinder you would recommend and how it would be heated.
There are are 4 more questions and a 'Mini Project' on heat losses, I will post them if I have some luck with these two. ANY help would be greatly appreciated. Thanks again.
Metals such as Copper and Iron cannot be coupled directly in a system because of their positioning within the Periodic Table.
The further apart they are, the greater the potential for a chemical reaction with an electrolyte (the water (or the salts in the water)) to produce an electrical current (exactly as a battery works) which would dissolve one of the metals (electrolysis). To combat this, a bridging metal is used that reduces the distance between the elements.
Generally in the plumbing industry, fittings such as radiator valves and bushes which are placed between the copper and steel are made of brass.
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