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Dear Mehdi, There are a couple of issues going on here. First, Type91 is a sensible heat exchanger that is intended to be used with liquid on both sides. You can use it for a water to air heat exchanger but you need to use a Type33 on the outlet side to compute the humidity of air leaving the heat exchanger. Keep in mind that the heat exchanger will only transfer sensible heat so you have to assume that the absolute humidity ratio of the air going in to Type91 is the same as the absolute humidity ratio of the air leaving Type91 (only the temperature and the relative humidity change). Second, it sounds as though you need a version of Type683 that will calculate the outlet humidity ratio based on a known regeneration air temperature. There are two options here. If you are able to update to Trnsys17 and the TESS HVAC Library for Trnsys17, then Type683 is now available in two modes, one that calculates the required regeneration air temperature to achieve a desired humidity setpoint and one that calculates the outlet humidity given a known regeneration air inlet temperature. If you need to stick with your current Trnsys version then you can put an auxiliary air heater on the outlet of your Type91 and further heat up the air if it is not sufficiently hot to achieve the dehumidification that you want. Kind regards, David On 10/21/2012 11:17, Mehdi Salehi
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 |