[TRNSYS-users] change coolling fluide in Type 107

[David BRADLEY]

Salima Adjiri,
   To clarify in case I do not entirely understand your question typical 
absorption chillers have a refrigerant that is entirely internal to the 
machine and then they have water as a working fluid in their cooling 
liquid, chilled liquid and hot liquid loops. I am not certain whether 
you are asking about how to change the assumed refrigerant in Type107 or 
if you are intending to change the working fluid in the heat exchange 
loops.

   The type of refrigerant inside the machine gets wrapped up into the 
performance data files that describe the machine's cooling capacity as a 
function of the heat exchanger loop inlet conditions. I suppose that if 
you had such data for a machine that used ammonia as its refrigerant 
then you could reasonably model an ammonia based hot-water fired chiller 
with it.

   The difficulty with changing the working fluid in the cooling loop, 
heating loop, or chilled loop to ammonia is that ammonia properties are 
not very constant over the temperature range that you would likely be 
working with. Type107 (and nearly all other TRNSYS components) assume 
that specific heat and density of the working liquid is constant so you 
have to be careful which fluids you specify.
kind regards,
  David


On 5/7/2015 5:18 AM, salima adjiri wrote:
> Hi,
> I want to know if we can change proprities of coolling fluid in type107.
> we want to replace water by ammonia.
> kind regards,
>
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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