[EnergyPlus_Support] Re: Plant Loop Setting

["natasamdj" <natasamdj@xxxxxxxxxxx>]

Dear Michael,
I posted my files in EPSupport_BaseboardModel.zip and with the 
explanation "Baseboar Heater Model and Plant Loop Control". I could 
not find where is the wrong in my files. I am sending to you three 
files *.idf, all of them more or less similar. In addition I am 
sending to you a doc file, with the explanation what about I am 
wondering.

Please, help to me with your answer or adivece.

Thank you in advance!

Natasa M.Djuric

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> 1.  Baseboard Heater:Water:Convective is intended to model 
thermostatically 
> controlled baseboard heat.  The model is not controlling return 
water 
> temperature, rather it is controlling the water flow rate to add 
the required 
> amount of heat to the zone to meet the thermostat setpoint.  There 
is not a 
> direct way to model uncontrolled baseboard with varying supply 
temperature.  
> The way to make the baseboard always run at full flow is to set 
the thermostat 
> setting very high.  You should then see full flow whenever the 
system is on, 
> but the heat output and suppy-return deltaT should vary as the 
supply 
> temperature varies.
> 
> 2.  Check the setpoint schedule definition.  There should be no 
difference in 
> setpoint operation between design days and other days.  If you 
cannot see the 
> problem in the schedule definition, then please sumbit the file 
(zipped) to the 
> files are of the yahoo group or e-mail to energyplus-support@...
> 
> Mike
> 
> 
> On 19 Sep 2006 at 12:37, natasamdj wrote:
> 
> > Dear,
> > I have two questions about the Plant Loop settings. I have made 
a 
> > model with the Baseboard Heater: Water: Convective. In addition 
I 
> > have the real data, and I would like to adjust the simulation 
output 
> > with these real-life data.
> > 1. I set the Loop Temperature Setpoint by using Set Point 
Manager: 
> > Outside Air. I found out in the output that E+ calculated the 
load 
> > so that water mass flow rate has been increased how the Loop 
> > Temperature is lower. In other words, how the outdoor 
temperature 
> > increases, the supply water temperature is decreased, and the 
water 
> > flow is increased. I have some real data, and I would like to 
> > combine that with the simulation results. Actually, I found out 
that 
> > E+ calculated almost the same return temperature for the 
different 
> > outdoor temperatures, while the supply temperature is decreased. 
> > Because of that the water flow has been increased all the time 
how 
> > the outdoor temperature is increased. How I can model different 
> > managing of the return temperature? Is it possible to model that 
the 
> > difference between the supply and return water temperature is 
> > constant (or almost) constant for the different outdoor 
conditions?
> > 2. I found in the report output, that System Node Setpoint Temp 
for 
> > the demand side is calculated only for the design day, while for 
the 
> > other days it is zero (0). In this case the System Node Setpoint 
> > Temp for Demand side should be calculated regarding to Set Point 
> > Manager: Outside Air, and it is calculated exactly by this 
schema 
> > but only for the design day. In addition, the System Node 
Setpoint 
> > Temp is calculated correctly for all the nodes at Supply side, 
but 
> > not for the nodes at Demand side. What should I do to get these 
> > temperatures correctly for all other days at Demand side nodes?
> > 
> > If it is necessary I can send to my *.idf file.
> > 
> > Thank you in advance!
> > 
> > Natasa M.Djuric 
> > 
> > 
> > 
> > 
> > 
> > 
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> > 
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> > 
> > Attachments are not allowed -- please post any files to the 
appropriate folder
> > in the Files area of the Support Web Site.
> > 
> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf 
and press the
> > "search" button.
> >  
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@...
>






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