[EnergyPlus_Support] Example files 5ZoneNightVent2 & 5ZoneNightVent3

["eric_zhou1223" <eric_zhou1223@xxxxxxxxx>]

Hi all£¬

I am studying the example files 5ZoneNightVent2 & 5ZoneNightVent3. 
They look like almost same except the definition way of night vent.
Are they only different simulation methods of night vent?
 Users may attain their goals using any of these two opptions?  
Though paramters of two files are same, it reads "In this case, we 
see no benefit with night ventilation compared to the base case 
(5ZoneNightVent1.idf)" in the Basic file description of  
5ZoneNightVent3, while in 5ZoneNightVent2 it reads it can save a 
modest benefit with night ventilation. Is it right or am I missing 
something?

In another word, What is essentially the difference between 
5ZoneNightVent2 & 5ZoneNightVent3? 

By the way, which fan will be used to excute the night purge in 
5ZoneNightVent2, still the central supply fan? How can the "intake 
air" leak off at last from the spaces after it finish precooling the 
rooms? I think there should be a return-air orgniaztion but in fact 
I don't find it out. Or it leaks out from the plenum /cracks?

Sorry for the long might-be unclear quesitons but I am realy looking 
forward to hear your explanation soon. THank you.

Eric 







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