On 09/10/2013 18:11, dennis@home wrote:

What do you think the glass does in a greenhouse if not stopping the IR
radiation from being radiated and hence making the inside warmer than
the outside. Its just as well that it does or passive solar heating
would be a waste of time.

just a stray thought. Perhaps Dennis' greenhouse is made with low-e
Pilkington glass.

--
Roger Chapman