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Discussion Topic: Diesel heaters
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ADI |
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Which is better
1 outlet then split into 4 larger outlets or 4 outlets at a smaller diameter no splitting required?
Regards
Adrian Michelle
Beck Braydon and Mere.
This message was edited by ADI on Sep-22-20 @ 9:24 PM
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ADI |
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4 outlet version
Regards
Adrian Michelle
Beck Braydon and Mere.
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ruby |
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I don't claim to be an expert but I would go for the 4 tube version. I have two splitters on my boat and it is a nightmare trying to get the heat to balance between fore and aft.
One outlet is fierce and hot, the other three are gentle and warm. I would prefer the other way round.
I think you have more chance of heating your whole boat with four tubes and no splitters .
Graham
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Regulo |
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Another vote for the 4 separate outlets, Adi. The less restrictions to flow the better. Every junction will disrupt the air flow a little. But don't overlook the practicalities of running and insulating separate hoses the length of the boat. It might be more practical, depending on your proposed layout, to run larger hoses to a convenient split point. There's no hard and fast rule with these things.
Regards, Ray.
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ADI |
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I've just worked out the area of of the single outlet (A˜17671.46) and the 4 outlet version (A˜22167.08) there is a greater area with the 4 outlet version so should be less restriction for the heater.
Regards
Adrian Michelle
Beck Braydon and Mere.
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ncsl |
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If you use the 4 way heater then would suggest you make sure that at least one outlet can NOT be turned off.
Safety reasons.
I cruise on THE NORFOLK BROAD as I can not cruise on something that is NOT.
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Regulo |
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Mardles sometimes
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quote:"......
I've just worked out the area of of the single outlet (A˜17671.46) and the 4 outlet version (A˜22167.08) there is a greater area with the 4 outlet version so should be less restriction for the heater.
......."
That might not tell the whole story, ADI. One large outlet cowl may possibly restrict the direct flow from the heater less than the 4 outlet version. The 4 outlet one puts a large lump of plastic directly in the centre of the outlet from the heater. Again, who knows until you try it? By which time, it's too late!!! 
Regards, Ray.
Whatever happens now, I'm blaming it on Brexit. Everyone else is!
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Steve51 |
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Also worth noting is that resistance will be far greater through the smaller ducts than the larger one. The air volume will decrease significantly over a greater distance too. If you were running one of those small ones the full length of a boat, I doubt you'd get much out of the end.
I did a fair bit of work on ducted air systems during my working life, although it was on installation rather than design, so I can't claim to be an expert.
Steve. CM1 and NR12
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annville |
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Hi I dont think that there is a best way it depends on how is the best way to distribute the air and if each outlet is fixed or adjustable if the first outlet on a run is opened than this will reduce the flow to the others many have a 4inch flow from heater the tee off this is fine if heater is say at one end of boat but if in middle you will want two runs at the end of the day the heater will only produce a given flow you then divide it between out lets it is better to have to bigger size then to little. John
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ruby |
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Not meaning to hi jack the thread but has anyone tried inserting an inline electric fan (ie computer cooling fan) into a length of heating ducting to improve the flow to distant outlets ?
Can't see any obvious problems other than the heat of the air in the ducting melting the fan if plastic.
Any thoughts would be appreciated and might also help the op.
Graham
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Sep-22-2020 @ 9:22 PM
