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Re: [EnergyPlus_Support] Setpoint manger control for a BASELINE system-6 (packaged rooftop VAV with reheat)



To give you my two cents I use a SPM warmest for that indeed.

If you look at the exact language (which I don't have handy), the SPM warmest makes the most sense (it says something like "reset higher when conditions allow or something)

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Le 28 avr. 2016 à 10:49, "telemar87@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> a écrit :

 

Dear all,

I would like to know which type of setpoint manager should be set for the central AHU, if a baseline system-6 is being modelled.
ASHRAE 90.1 does not point particular configuration except @ G3.1.3.12 Supply air temperature reset: the air temperature for cooling shall be resethigher by 2.3°C (ASHRAE SI version).

I have some doubts about the setpoint manager that should be used.
The pre-built system-6 scheme proposed by DB uses an outdoor air reset in which actually a linear modulation in a 2.78°C band large is used. (2.78°C seems to be simply the conversion of the 5°F IP ASHRAE to °C, let's consider 2.3°C).

In my case the zones setpoint are 20°C in heating and 26°C in cooling (it's a multizone system). 
The zone heating equipment is dimensioned  for a temperature difference of 11°C, (in sizing:zone for heating and cooling is set a temperature difference of 11°C).
in this case the PIU outlet air temperature should be 31°C in heating and 15°C in cooling.

At this point, how the setpoint manager just after the AHU should be set? Which type of SPm should be used?
Intuitively I would use a warmest setpoint manager with a temperature set with 15°C minimum setpoint temperature and 17.3°C maximum setpoint temperature.

Is this approach correct? What do you usually do in this case?

Thanks,
Marco


 


<system 6 scheme.png>


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Posted by: Julien Marrec <julien.marrec@xxxxxxxxx>


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