Greenhouse Radaint Question

Weezbo

there is a section on Green houses from the steam boilermans perspective...

National Heating Guide....

cruizer

This guy wants me to do a heat load on this greenhouse he's building. Unfortunately he already put the radiant in the slab. It's 5/8" at 9" O.C. But the greenhouse is one of those dome ones where they just use metal bracing and throw visqueen over it.

how would I go about this one? Does visqueen even hold in heat? He wants to keep it about 60 degrees.

jerry scharf_3

I detect

someone who is good at wanting and ignoring reality. I like to think of these people as unintentional commediens.

Where is this located? Visquene has an R value approaching 0. What would be the infiltration rate on a windy day? 1 ACH? 10 ACH? I'd say the guy is barking up the wrong tree.

I'm not sure even this would work, but look at a root warming setup. You keep the roots at 60F. The the floor heat is just to keep the air above 40F, which might be possible.

jerry

cruizer

Thanks for the reply.
I'll have to get the ACH, see how tightly this "greenhouse" is going to be built, but I'm guessing he probably doesn't know. It is located in Northern Indiana, it's a nursery place. The ODT here is 0 Degrees. When I was told of the project, my frist reply was that it's not going to work, only make a root warming system. And even that is gonna take alot of BTU's to do.