Re: S. Africa PBMR Project Status

On Feb 26, 4:18 am, "Alessandro" <I...@xxxxxxxxx> wrote:
<dave.walt...@xxxxxxxxxxx> ha scritto nel messaggionews:1172489437.246354..268860@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Feb 26, 3:26 am, "Alessandro" <I...@xxxxxxxxx> wrote:

Basically my question is this:the PBMR core heats up helium from 500 to
900
°C,after that is discharged at 140-160 °C.So,aside low thermal
desalination
process on site,could it be possible to heat up water at temperatures
high
enough for district heating (or district cooling) in the hot months?Have
you
got any estimate about max water temperature achievable with helium at
140-160 °C?
Where do you see "discharge" at only 140/160 C? One has to measure the

heat at the point in which it heats the object of the plant: water or>chemicals. These proposals for 'co-gen' talk about using a smaller gas

turbine for, say, 30 mws and the rest of the energy (say, another 80>MWs worth) for direct high temperature desalination (or H2

production). Is this what you meant?

David

Of course I don't mean "disharge" to the ambient if this is your point,PBMR
is a closed helium turbine cycle,after expansion in turbine helium is cooled
down to temp of 140-160 degrees through a recuparator and recompressed
after.Obviously it's not possible to resuse this "waste" heat to produce
electricity or hydrogen
via high temp chemical reactions,but we could develop low thermal
desalination and district heating,in the second case we have to be sure
temperature water (produced from cooled helium until 140-160 degrees) is
enough higher than 100 °C to win transportation hot water loses (about one
degree per km in the district heating network)

Ah...OK, I get it now. I tought this is what you may
meant...extracting every bit of heat from the inert helium for use
someplace.

I didn't know the formula for transportaiton of hot water.
Interesting. Do you know if this 140-160 C is in fact the helium
temperatures before it goes to the helium chillers? IF it is, then low
temperature industrial processes are possible obviously.

David

.

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