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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:
-- *************************** 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@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |