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

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

From: "srk iitm srk.iitm@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>

Date: Thu, 15 Feb 2018 04:42:16 +0000 (UTC)

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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@xxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
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.

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Posted by: srk iitm <srk.iitm@xxxxxxxxx>

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