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Ambient Temp Heating System
Eric Long_2
Member Posts: 2
I am trying to find out about a new system of hot water heating that constantly circulates hot water at just above room tempurature keeping the room tempurature consistent. Does anyone have any information about these types of systems?
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That concept was
pioneered by the Germans (such efficiency mavens). Even today, German engineers are appalled that we send return water back to our boilers as hot as we do. Their ideal is to send it back as close to room temperature as possible, whereby it has little work left to do.
Some of these principles were developed just after WWI during the Weimar Republic. Hyper-inflation and scarcity of fuel was the driver. Today's Crock Pots are an outshoot of that, where people would cook in clay pots insulated with straw with little fuel expended over time. Just a bit o'history for reference.
(I do not mean to exclude non-Germans, others have a stake in this form of heating).
The way the heat manifests itself in the space served is most often radiant floors but radiators in general as well. Key is large emitter surfaces (and naturally low heat losses to begin with). The radiant effect is the biggest bonus to the process.
The principle takes on other forms, cooling specifically in the "chilled beam" concept, which also may serve heating in season.
Just the background.0 -
Kind of rough for the supply temp to be near room temp to meet the design load (flow will be enormous and delta-t tiny) but quite easy to design to keep return temps near ambient at most conditions, IF YOU HAVE PROPORTIONAL FLOW!!!
Important to note that the smaller the device heating the space, the higher the surface temperature requirement and thus the higher the supply temperature requirement.
You get the sort of condition where it appears that lowering the flow increases heat output (Just remember that to do this you must also increase the supply temperature.)
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