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Eleftherios, I think that you are mixing aspects of "energy rate control" and "temperature level control" and I would suggest that you get the tutorial called "Temperature Level Control from Energy Rate Control" available at http://sel.me.wisc.edu/trnsys/downloads/tutorials_and_examples/tutex17.htm as it will show you the steps necessary to take a "loads" based simulation and turn it into a simulation that uses thermostats and real equipment. The reason that your simulation is giving you such low (and probably high) outlet water temperatures is that you have a constant capacity heat pump connected to a controller. If the capacity of the heat pump is very large (and it probably is if you have sized it to the peak load of the zone) then during times when there is only a little bit of load on the heat pump, it is still turning on at basically full capacity. Since you have a very tiny flow rate during those periods, you are getting a very big temperature change across the heat pump. In most systems like this the flow rate is not changed during low demand periods so the temperature change does not increase. If you do want to investigate the impact of a variable flow rate system then you probably also need to look at the use of a variable capacity heat pump that does not always run at or near its rated capacity. Kind regards, David On 6/3/2014 04:17, Eleftherios
Bourdakis 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 |