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Martin, You are correct; Type107 is designed so that it takes the chilled water set point as an input and provides the required power as an output. If you are working on a simulation where you have a certain amount of power available (from a PV or a wind turbine) then what you can do is to implement two instances of Type107 in your simulation. One of them would be running all the time (i.e. it's control signal input is always set to 1) with its cooling water, hot water, and chilled water inputs connected but none of its outputs connected. The only output that you would use would be the required power. This instance of Type107 would be in your simulation only to determine how much power would be required in order to run an absorption chiller under current conditions. The required power would feed into an equation that would compare the required power to the power that you actually have available. If you have more power than you need then the equation's value would be 1. If you don't have enough power to run the chiller then the equation's value would be 0. The result of the equation would be sent as the control signal to a second instance of Type107 that is identical to the first except that it is not always on and its outputs (the outlet cooling water, chilled water, and hot water outlet conditions) are connected. In essence you are using a virtual chiller to determine a control signal for the actual chiller. Kind regards, David On 4/25/2014 04:17, Martin Berov 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 |