solar assisted absorption cooling
solar assisted absorption cooling
(OP)
For designing a conventional electrical air conditioning system for a given space, the cooling load has to be estimated (internal gains + external gains)
I have found the cooling load, and I plan on using absorption chillers which would use hot water to operate. The hot water would be obtained from solar energy.
I am confused as to how do I start off?
except for calculating the cooling load I haven't done anything.
I have found the cooling load, and I plan on using absorption chillers which would use hot water to operate. The hot water would be obtained from solar energy.
I am confused as to how do I start off?
except for calculating the cooling load I haven't done anything.





RE: solar assisted absorption cooling
Not that easy; the smallest lithium bromide absorption units I know of are 10 tons.
RE: solar assisted absorption cooling
select your unit first, then talk with manfucturer.
also do everything under suppervision of an older engineer in your company
finaly do your load calculation by hand not by a program.
RE: solar assisted absorption cooling
I have found a few LiBr-water absorption chillers by Yazaki and Trane
My next doubt is regarding the calculation of the solar collector area
for a fact I may use TRNSYS to find out the collector area but im looking for hand calculations
RE: solar assisted absorption cooling
Than you certainly need to have temperature regimes aligned as Willard mentioned.
Some manufacturers indeed developed absorption chillers intended to low and moderate load for HVAC applications, but they seems to be very ineffective in overall, I already attended some courses where thermodynamical analysis are conducted and shown how ordinary chillers and much more energy efficient, low load absorption chillers have EER close to miserable and even direct firing cannot improve energy balance much.
I believe that technology is yet to be developes. Absorption chillers are unparalleled for large-scale refrigeration applications, but that is not the case for moderate commercial projects.
RE: solar assisted absorption cooling
the thing is I plan to make se of LiBr-water absorption chiller which if not completely, partially be powered by solar energy
I have read through quite a few journals written on Solar assisted absorption cooling but none of them specify the formulas (hand calculations) as to how was the system sizing done along with the collector area, inlet temp. for the system etc.
please help me obtain hand calculation formulas/method
Thanks
RE: solar assisted absorption cooling
Also mechanical engineering handbooks of older editions have sections devoted to this subject.
RE: solar assisted absorption cooling
I'm guessing that a place that needs heating will only get less than about 5 kWh per day per m^2 of collection area. That means you'd need a minimum of 36 m^2 of collection area, or ~400 ft^2, and that's only to account for the direct heat load. There are losses and there may be other limitations. While that area is something that will fit on a rooftop, that'll be a gigantic dead load on the roof structure.
TTFN

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