Wood/Solar Radiant Heating

Hi,
I am exploring options to use a mix of wood heat (via boiler or wood furnace with hw coil) in combination with 50 Theromax solar tubes connected to a dual coil 80 gallon tank. The combination would provide DHW and radient heat to 5 radiators rated at ~ 35,000 BTU/h @ 180F.
I am curious to know if anyone has any expierence with this and more importantly, the types of wood heating devices used.
Thanks!

I grew up with a wood stove-hotwater heater-oilheat combination. Worked great in winter but was detrimentral in summer

I grew up with a wood stove-hotwater heater-oilheat combination. Worked great in winter but was detrimentral in summer

Jefff wrote:

Hi,
I am exploring options to use a mix of wood heat (via boiler or wood furnace with hw coil) in combination with 50 Theromax solar tubes connected to a dual coil 80 gallon tank. The combination would provide DHW and radient heat to 5 radiators rated at ~ 35,000 BTU/h @ 180F.
I am curious to know if anyone has any expierence with this and more importantly, the types of wood heating devices used.
Thanks!

Planning to do the same with boiler outside. I posted a sketch on alt.binaries.pictures.tools , if you are interested in a DIY idea.
It is a siple tube heater with a spiral copper coil wrapped around it, with the hot air following the spiral.
The scrubber is optional, but I will use it.

Thanks! Mine will be inside. I am just curious to know how much BTUs is required to raise the temp of water from say 80F to 180F for 4 hours or so.
I don't have a summer heating requirement, however I assume that what is necessary could be provided by the solar tubes in summer since they would be dumping heat somewhere anyway. It is the Nov-March situation where I need to boost the solar heat.
The boiler idea seems great, but I don't know how much boiler is needed. I currently have a hacked together wood furnace thing with a DHW coil. The furnace is by no means effecient in today's standards. It seems most of these manufactures cannot articulate how much BTUs their furnaces generate with the optional DHW coil. Since there is already ducting in the house, a furnace would work great; as long as it could generate 100F water above what the tubes have already done.
Anyone know of any designers out there who work with this stuff?

Jefff wrote:

Thanks! Mine will be inside. I am just curious to know how much BTUs is required to raise the temp of water from say 80F to 180F for 4 hours or so.
I don't have a summer heating requirement, however I assume that what is necessary could be provided by the solar tubes in summer since they would be dumping heat somewhere anyway. It is the Nov-March situation where I need to boost the solar heat.
The boiler idea seems great, but I don't know how much boiler is needed. I currently have a hacked together wood furnace thing with a DHW coil. The furnace is by no means effecient in today's standards. It seems most of these manufactures cannot articulate how much BTUs their furnaces generate with the optional DHW coil. Since there is already ducting in the house, a furnace would work great; as long as it could generate 100F water above what the tubes have already done.
Anyone know of any designers out there who work with this stuff?

look up the definition of BTU, use the amount of water, and the temp diff, and you should have it.
j.

"Jefff" wrote in message

Thanks! Mine will be inside. I am just curious to know how much BTUs is required to raise the temp of water from say 80F to 180F for 4 hours or so. Simple steam table will tell you that......a pound of water needs 1150.4

btu's to get to 212F. then an additional 180btu's to phrase change to saturated steam.

I don't have a summer heating requirement, however I assume that what is necessary could be provided by the solar tubes in summer since they would be dumping heat somewhere anyway. It is the Nov-March situation where I need to boost the solar heat. Heat might actually be a good thing, if you are into aborbsorption(like

ammonia) cycle airconditioning.

The boiler idea seems great, but I don't know how much boiler is needed. I currently have a hacked together wood furnace thing with a DHW coil. The furnace is by no means effecient in today's standards. It seems most of these manufactures cannot articulate how much BTUs their furnaces generate with the optional DHW coil. Since there is already ducting in the house, a furnace would work great; as long as it could generate 100F water above what the tubes have already done.
Anyone know of any designers out there who work with this stuff? How manyBtu 's is the woodheater and same for the solartubes....numbers for

the boiler tube size and length. Can't do that until know what the heat source value is.

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"Arnold Walker" wrote in message

"Jefff" wrote in message Thanks! Mine will be inside. I am just curious to know how much BTUs is required to raise the temp of water from say 80F to 180F for 4 hours or so. Simple steam table will tell you that......a pound of water needs 1150.4 btu's to get to 212F. then an additional 180btu's to phrase change to saturated steam.

Uh.... You reversed that. It takes 180 BTU to heat the water from 32F to 212F and 1150 to vaporize it to steam.
From 80F to 180F would take about 100 BTU/lbm of water.
daestrom