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Meriem, TRNSYS's outputs are almost always the average value of the variable over the timestep. Type99 makes some assumptions about what kind of data is provided in the file (averages over the timestep, instantaneous values at the end of the timestep, etc.) so you have to make certain that the data you are providing has the same assumptions. If you are working with field measured data and need a little more flexibility in reading it you can use Type9. Type9 does not do the radiation processing that Type99 does so you will have to connect your Type9 to a Type16 radiation processor. Type9 does, however, allow to you specify what kind of data you are providing (in terms of averages over a timestep, totals for each time step, or instantaneous values at the end of the timestep) for each of the values that you read. As far as your questions 3 and 4 are concerned, the correlations that take raw radiation data and use it to compute the radiation falling on an arbitrary tilted surface require that you specify two components of the radiation. The correlations that use Ibn (Ibeam_normal) and one other component (I for example) are the preferred correlations. That, however, does not mean that you can't read all of the components if you have them measured. Simply use I and Ibn for the radiation mode. Best, David On 4/27/2014 18:05, MERIEM SOUSSI
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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@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |