On 04/16/2018 10:43 AM, Dave Cole wrote:
If you want to get fancy, you can chill water with heat
using an ammonia absorption system (chiller). That's
what hospitals and many large commerical buildings use for
air conditioning. But they get complex and you need to
deal with ammonia. Really nasty stuff. IMO, not
worth the complexity.
Nobody is using ammonia absorption chillers anymore (at
least in the US). It is very inefficient.
There was this co-generation fallacy in the 1960's through
the 1980's, maybe. The idea is, if you have to make steam
for process heat, then it is free to extract energy to run
turbine alternators to make electricity from the
high-pressure steam, and then send the low-pressure exhaust
from the turbines to the process (hot water, steam heat,
whatever). And, if you have to provide electricity from the
turbines, then the process steam is free. Well, the fallacy
is that neither of these is actually free!
So, everybody finally understood the error in thinking, and
cut WAY back on the size of their boilers.
So, almost anyplace where a steam-powered chiller once
stood, there is now an electric turbine chiller with a
variable-speed drive and variable vane control, and it uses
WAY less energy than the old steam chillers.
Oh, and the ammonia absorption systems were mostly phased
out in the 1950's for lithium bromide absorption chillers.
Less hazardous and more efficient.
Jon
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