On 24 Sep, 16:12, The Natural Philosopher
wrote:
harry wrote:
On 24 Sep, 12:27, The Natural Philosopher
wrote:
Man at B&Q wrote:
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
One good way to sort all this out is to create heat banks - more or
less insulated underground masses that you can pump or store surplus
summer heat in, to be pumped out again in winter.
That's been done with some success.
One of the things you CAN store with relative ease is low grade heat..
the ground is eminently suitable for being used in that way.
I.e. you could use a flooded mine deep underground to pump heat into.- Hide quoted text -
- Show quoted text -
All been tried. * The heat leaks away. *It would need to be stored for
months to be useful.
Er no, actually the heat doesn't leak away that fast, its been tried and
it has been very successful.
Soe old mines in Poland are being pumped for heat, and wont cool down
for 20 years..
Any more than te Earth itself, which has stayed nice and hot inside for
the last few million.
What we actually need is some sort of technology to turn the heat into
something we can store.
No, we don't. We need to build heat storage systems cos they are
practical and cheap.
Just because you cocked up a heat pump installation in wales, doesn't
mean all heat pumps are bad, or using teh earth as a thermal store does
not work.
Seeing as its you, the reverse is more likely.
I did see a project that stored heat as crystalisation energy. Also
called phase change technology.
*But is went very quiet. *I suspect it failed
http://en.wikipedia.org/wiki/Phase_Change_Material
More likely it worked, but at totally impractical efficiencies and costs.
Like most 'new great Green Ideas' in fact.- Hide quoted text -
- Show quoted text -
As usual you are a bloody half wit. Heat from mines comes from
geothermal sources, nothing to do with heat stores. The Earth is not a
heat store, it would have cooled off billions of years ago. There is
a nuclear reaction/process of radioactive decay in the centre of the
Earth that keeps it hot.
http://en.wikipedia.org/wiki/Earth#Heat
Janitors don't know much.