Worked out some plans for a horse barn recently. With water to water you could go in the dirt, walls ceilings or walkway slabs. pm me if you think my research would help.
j

What is the operating temp of these other systems with stainless on the walls (sounds like you'll need higher than geo temps or larger radiation footprint)?
How high are the ceilings? You could try ceiling or wall panels.
In my horse barn project, the price became prohibitive. Low temperature radiation is limited in application.
Joe

i know. 8' ceilings.

im not sure what will become of it.

Tim,

Have you talked to a USDA County Extension Agent. They could direct you to the needed information regarding Pig Barn requirements for temp/humidity control and ventilation. From there it's just normal HVAC calcs. I'm pretty sure the heat demand is fairly low in Pig barns but the need for ventilation is substantial. (Lots of pigs in a small space generate plenty of their own heat and plenty of humidity)

Beware that the conditions in a pig barn are hard on equipment - lots of corrosion due to humidity and ammonia (urine). I'm pretty sure most Pig barns have concrete floors with perimeter slats for waste removal. So typical infloor radiant might be a possibility though might be unsatisfactory at the perimeter where you need it most.

Hey Greg, thanks for the info. I am currently looking at putting stainless pipes on the walls. I know the floor is out of the question.


Tim

Stainless steel is pretty pricy but probably the only metal pipe that won't corrode in a pig barn. I wonder if you could attach pex to the wall and then trowel on a strong cement based coating (stucco/gunite/?) for less $.

Actually, you could probably use the stuff found at bekausa.com . It's a capillary tube HDPE radiant system made for walls and ceilings. It would do a good job for this. It would be plastered in then.

In horse barn and previous hoop house research, I looked at both "in-earth" radiant as well as tube embedded rubber mats. The biggest problem with so many of the farms around here is that they don't have the kind of budget it would take to set a system up.
J