Re: Nuclear PBMR district heating


"Alex Terrell" <alexterrell@xxxxxxxxx> ha scritto nel messaggio
news:1138878618.410012.125980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Does the 1 degree per km refer to branch lines from a municipal power
station?

Yes,it's a typical average worth in Italian DH networks,including some
geothermal ones (for example,Lardarello)

So guessing a bit, this would have about 100MW of heat coming
out in about 5 branch lines, so 20 MW each.

A nuclear reactor on the other hand, would need to send 1GW of heat
along a major "artery", to a city Centre branch distribution point.
This would use a pipe some 50 times bigger, so with perhaps 7 times the
surface area, giving a heat loss of 1C/7km.

That's the point. Nuclear district heating is not feasible with big nuclear
reactors, 1 GWe or more.Small (165 MWe,400 MW thermal each) pebble bed
reactors could be a good solution,instead.I was thinking on a confuguration
of 8 reactor in 1 site,with 8 independent branch lines each one feeding
differnnt parts of the city.
If helium at 140 °C can heat up water at 100-120 °C the project is
feasble,although typical long distances from town centers where nuclear
reactors are usually placed (anyway,considering high HTGR reactors "passive"
safeness,I assumed no more than 10 km)

Also, on this artery, it would be viable to have expensive insulation,
e.g vacuum.


.

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