[EnergyPlus_Support] Re: fan problem

["Jean marais" <jeannieboef@xxxxxxxxx>]

Thanks for the warning of the allotherdays and that designday is included here. I use alldays for everything as I'm only running the designday simulation, this runs the schedules for all day types.

What I find most interesting is how different the "American" approach to HVAC is in it's mind set. I can see by your replies that modeling a VAV system and a low temperature radiant system which acts as the priority cooling system is not something that is often modeled. Econimiser as such has little meaning in the German world of DOASs where this basically means that the cooling coil simply doesn't turn on. 

Low temp radiant system objects in e+ opperate almost completely alone. They have their own room thermostat and they get sized independantly to the Air Systems. This means I can set a seperate "normal" dual setpoint zone thermostat for the Air Systems of 50 degC so that the Air Systems are only occupied with meeting outdoor air requirements and not cooling the zone. I set a setpoint manager at the coil outlet to maintain the supply air at a constant 18 degC (no dehumidification). 

This system would work fine except that the fan object (variablevolume) will not turn on if it sees no zone cooling loads. This is a incredible restriction. I must also be able to model a dumb system. 



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