[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] unable to reach set point temperatures in zones





When you use XesoView or DesignBuilder's results viewer you can graph outputs including schedule values.

On 15 Feb 2018 1:43 pm, "srk iitm srk.iitm@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

Mr Jean

Thank you very much for your reply.

could you please answer my otehr question as well..

Make sure your design day set point curve is a flat line and that all internal loads associated with it are also a flat line. This gives a nice steady state peak. 

How to do this? how to make sure that setpoint curve a flat line? Can you please elaborate this 


 
Thank you, Rakee



From: "Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@yahoogroups.com>
To: EnergyPlus_Support@yahoogroups.com
Sent: Tuesday, 13 February 2018 10:26 PM
Subject: Re: [EnergyPlus_Support] unable to reach set point temperatures in zones

 
Hi, the lag I refer to is the amount of additional time it takes to transfer the thermal energy to the air. Think of it as a response time. When I turn the fancoil on 100% it will condition the air very quickly, whereas the radiant system is still getting to the needed temperature. This is more true the more massive the structure. E+ has now also a simplified radiant model (previously only the massively imbedded pipe model was available) which may be more responsive and possibly better simulates the more lightweight hanged hydronic ceiling panels.

Generally, for this reason, avoid changing the setpoint temperature by more than 2 Kelvin or turning the equipment on and off too often (there are exceptions, but this is a good starting point).

Re sizing: Chilled ceiling...77 W/m2 is pretty exact, but in the right ball park for a chilled ceiling. Rating values relevant only for the active area are about 65 to 125 W/m2 depending on rating conditions and technology. 

Re Setpoint Schedule: I use compact schedules exclusively. Therein I define the air setpoint that the equipment will try to meet at any given time on any day type. If you need to, define other values for the day type summerdesignday and winterdesignday. I suggest always keeping the same value here to avoid steps resulting in peak loads and oversized equipment.




__._,_.___

Posted by: Jean Marais <jeannieboef@xxxxxxxxx>


EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The EnergyPlus web site is found at:
http://www.energyplus.net/

The group web site is:
http://groups..yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the &quot;search&quot; button.




Visit Your Group
Yahoo! Groups
PrivacyUnsubscribeTerms of Use

__,_._,___