[esp-r] Re: Modelling a Machinery Room

[Jake Zwart]

When I read hydroelectric I think water turbine and your gains are the
inefficiencies in the generator.  

You may want to clarify whether it is hydroelectric, or thermoelectric and
what kind of cycle.

Jake

-----Original Message-----
From: esp-r-bounces at lists.strath.ac.uk
[mailto:esp-r-bounces at lists.strath.ac.uk]On Behalf Of Jon Hand
Sent: July 30, 2009 5:25 AM
To: Felipe Duran; esp-r at lists.strath.ac.uk
Subject: [esp-r] Re: Modelling a Machinery Room



A question about models with very high internal gains...
________________________________________

I am modelling a machine room of an hydroelectric plant which has two
6000 kW generators.

It would be an enormous help if anyone could tell me about the
internal gains of that room. Any suggestions about how to figure out
how big the internal gains produced by the generators would be ?. Any
suggestions about how to model that kind of internal gains?

___________________________________________

We had a issue like this about 5 years ago.  High gains can be put
in as W/m2 rather than W/zone (this gets you past on limit in the
interface).

And it is good to remember that most of the underlying correlations
in simulation tools may not be valid when temperatures are exceptionally
high (above 90C).

If you can measure conditions (surface and air temperatures) in such
a facility it might give you something to compare with.

Also - some people have represented large heat generating equipment
as thermal zones within the main thermal zone.  Inject heat into the
equipment-representing-zone(s) to get close to the measured surface
temperatures of the equipment and allow the normal radiant and
convective transfer to interact with the rest of the model.

-Jon Hand


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