dual system..for the expert!!

[justlead1]

Hi To achieve gravity circulation the parameters are very tight. The cylinder needs to be as near as vertical above the boiler as possible an as high as possible. Long horizontal runs and the friction they provide, will slow circulation to a stop. What makes the water move is the circulating head, which is measured in parts of an inch. Developed by the weight difference between water in say 12" length of the flow and return pipe. The weight difference being the amount of water displaced with a temp difference of say 20 degrees is minimal. I would also challenge whether the coil/heat exchanger within the cylinder is capable of converting 14 kw per hour through this apparatus?

 

[peteheat]

Hi,

I would really love to be able to say this will work safely because I sell stoves !

There are stoves designed to work as part of a pressurised system, I have not come across one made by a UK manufacturer yet and I seriously doubt any of the Chinese models (including Stanley, Mulberry etc) have caught up with the design.

Please do not try to take elements of both open and pressurised systems to try to make the system work.

A 3 bar safety will be a total pain (constant call backs) because it will most likely be either blowing off or definitely weeping on a regular basis.

Forget what your plumber told you about his system he was not working for a consumer likely to panic when the pipes start banging.

The cylinder will use about 4 > 6 Kw of the heat when it is cold, as it heats up the return will get hotter, if the stove can produce 14 Kw you would need a heat dump (buffer) with a capacity of approx 700 litres.

 

[buffy27]

is a thermal store not pressurised ..seen stoves worked with 500l thermal store cylinders.

 

[peteheat]

Hi buffy,

Not neccesarily like most large cylinders buffers, thermal stores, accumulators can all be plumbed to suit the heating appliance.

Coils can be fitted to add or take out the heat, some are used as pre-heat cyinders.

In all cases the standard multi fuel stove should have the old fashioned header F&E tank for safety.

 

[Renewable M]

Hey pete, when you say the f&e for safety you mean the open vented aspect rather than a heat dump I'm sure.

p.s. what stoves do you sell. are you a shop? pm me if you like