On Sep 24, 8:35*am, harry wrote:
On 23 Sep, 20:35, "Dave Liquorice"
wrote:



On Thu, 23 Sep 2010 10:16:15 -0700 (PDT), harry wrote:
I have run heat and power systems. * There are lots of operational
problems, the main one being heat is not required in Summer

Yes one would need to have conventional cooling arrangements for the
times when the "2nd use" sink didn't want as much heat as one was
producing.

and it's often low quality heat eg warm water & not very useful.

Doesn't seem to be a problem for air or ground source heat pumps. The
technology exists to utilise low grade heat.

ISTR hearing about a rather extensive greenhouse system that took the
waste heat and CO2 from a power plant to grow tomatoes, ah here we
a

http://www.edp24.co.uk/content/edp24...?brand=BIZOnli
ne&category=Business&tBrand=EDPOnline&tCategory=xD efault&itemid=NOED16
%20Jul%202010%2018%3A38%3A57%3A473

http://tinyurl.com/35hssa3

The waste heat doesn't have to be used for heating homes/factories...

--
Cheers
Dave.

But even they don't need heat in Summer. *You need some kind of
industrial process that runs 24/7/52. *Most of these need sources of
high grade heat.
Capital costs are immense. *99.99% of the time they can't be
justified.
It's possible to "turn heat into cold" for Summer cooling but the
process is very innefficient

Absolute efficiency is irrelevant.

The question is, is it equal to or more efficient than the alternative
way to make "cold" from the other available energy sources?

MBQ