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Martin, A couple of pointers come to mind (and these apply to systems in general, not just to this particular system). 1. There should also be a pump in the loop whose rated flow rate matches the hot water flow requirements of the absorption chiller. The pump should be controlled in the same manner as the chiller so that if there is no load on the chiller, both the chiller and the pump turn off. 2. There should probably be an auxiliary heating device in the loop (Type6 perhaps) that raises the liquid temperature going to the chiller in case the water in the tank was not hot enough. 3. Most importantly, make sure that the tank is large enough to contain more than one timestep's worth of flow from the pump. For example, if your pump has a rated flow rate of 10000 kg/h and you are running with a 5 minute timestep, your tank needs to be more than 833L. If you try and run with a 1-hour timestep, you will almost never get convergence because the tank volume turns over more than once in a timestep. Best, David On 10/29/2012 04:24, Martin Ssembatya
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 |