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Re: [EnergyPlus_Support] Plant Loop Setting



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@xxxxxxxx

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@xxxxxxxx





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