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Dear Cathy On 12/28/2011 06:41, sun liang wrote: Type56's automatic HEATING and COOLING Types calculate the sensible energy required to maintain a predefined set point temperature (also called the sensible load). When you change to a controller that is trying to maintain the zone temperature by varying the temperature and flow of supply air, the "load" is no longer defined; in order to define the load, you need to predefine the actual room temperature (note that the actual room temperature and the room setpoint temperature are not the same thing!). Instead, the concept of "load" is replaced by the actual energy that is being adding to or removed from the zone. How to see this quantity depends a bit on what Types are in your system. If you are heating using a furnace, you would look at the output of the furnace that tells how much energy it added to the air stream. If you are using heat pumps, you would look at the heat pump output that shows how much energy was added to the airstream. You could also use a pair of Type33s (psychrometrics) to compute the enthalpy of the supply (h_in) and return air (h_out), then compute q=mdot*(h_out-h_in). The "control strategy" and "scale" fields in the Artificial Lighting gain window allow you to adjust the heat gains from lighting that the space experiences. Both are typically a value between 0 and 1 and they act as a multiplier on the base value that you specified using the "total heat gain" and "related floor area" fields. As with many things in TRNBuild/Type56, you have the option of selecting a constant value, scheduling a value, or telling Type56 that the value will come from some other Type (or equation) as an INPUT. The update from TRNSYS 16.x to TRNSYS 17.x is a paid update. Within each major version number (16, 17, etc.) there are periodic minor version updates (16.1, 16.2, 16.3, etc.) which are free. Kind regards, David -- *************************** 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 |