Market Farming

[<sunnfarm AT netscape.com>]

A professionally designed system the water temp going in will be the same 
coming out. The whole idea of bottom heat is temperature uniformity. On my 
bench top system the in and out temps hold at 120 degrees. Remember your not 
creating one big loop but many small loops from a common manifold... Bob.

--- thamnophis AT gmail.com wrote:

From: Thamnophis <thamnophis AT gmail.com>
To: Market Farming <market-farming AT lists.ibiblio.org>
Subject: Re: [Market-farming] Greenhouse heating
Date: Mon, 7 Feb 2011 23:50:18 -0600

If the water was 140F going in, how log was the tube and and what was
the water temp coming out?

Did you pack the sand in tight? (less air space would equal less
insulation [dead air space] and more heat absorption into the sand)

(I'm curious because I'm thinking of setting up something similar and
realize there is a lot of math involved!)

Joe


On 2/4/11, Jason Bomkamp <grt4kids AT hughes.net> wrote:
> I experimented with in floor heat this past fall.  I used 1/2 inch pex
> tubing at 10" spacing throughout the floor.  I had 2" polystyrene
> under it and 6" of sand over that.  My water temp was around 140
> degrees.  My results were very disappointing though.  My tomatoes
> froze last fall when it got down to around 20 outside, I was hoping
> for better results.  If someone knows some tricks to this I'm all ears.
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