During summer season in some systems there is no outdoor air (those spaces are unoccupied since June until September and the SummerDesignDay is 7/21). Nevertheless, as â??User Design Air Flow [m3/s]â?? the value that is imposed in DesignSpecification:OutdoorAir is considered also in â??zone coolingâ??, although I imposed a schedule that is zero during the summer season. I asked to the helpdesk and it seems that the calculations for minimum outdoor air do not look at the schedules in the DesignSpecification:OutdoorAir object.
Here an example:
DesignSpecification:OutdoorAir,
0serviziopalestra:Spogliatoio1 Design Specification Outdoor Air Object, !- Name
Flow/Zone, !- Outdoor Air Method
0.009440, !- Outdoor Air Flow per Person {m3/s-person}
0.000000, !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}
0.110000, !- Outdoor Air Flow per Zone {m3/s}
0.000000, !- Outdoor Air Flow Air Changes per Hour {1/hr}
occupazione aule; !- Outdoor Air Flow Rate Fraction Schedule Name
The schedule is the following one:
Schedule:Compact,
occupazione aule, !- Name
Fraction, !- Schedule Type Limits Name
Through: 1/15, !- Field 1
For: AllDays, !- Field 2
Until: 24:00, !- Field 3
0, !- Field 4
Through: 6/10, !- Field 5
For: Weekdays SummerDesignDay WinterDesignDay, !- Field 6
Until: 07:50, !- Field 7
0, !- Field 8
Until: 16:10, !- Field 9
1, !- Field 10
Until: 24:00, !- Field 11
0, !- Field 12
For: Saturday, !- Field 13
Until: 07:50, !- Field 14
0, !- Field 15
Until: 12:20, !- Field 16
1, !- Field 17
Until: 24:00, !- Field 18
0, !- Field 19
For: AllOtherDays, !- Field 20
Until: 24:00, !- Field 21
0, !- Field 22
Through: 9/10, !- Field 23
For: AllDays, !- Field 24
Until: 24:00, !- Field 25
0, !- Field 26
Through: 12/20, !- Field 27
For: Weekdays SummerDesignDay WinterDesignDay, !- Field 28
Until: 07:50, !- Field 29
0, !- Field 30
Until: 16:10, !- Field 31
1, !- Field 32
Until: 24:00, !- Field 33
0, !- Field 34
For: Saturday, !- Field 35
Until: 07:50, !- Field 36
0, !- Field 37
Until: 12:20, !- Field 38
1, !- Field 39
Until: 24:00, !- Field 40
0, !- Field 41
For: AllOtherDays, !- Field 42
Until: 24:00, !- Field 43
0, !- Field 44
Through: 12/31, !- Field 45
For: AllDays, !- Field 46
Until: 24:00, !- Field 47
0; !- Field 48
The cooling design day (SummerDesignDay) is 7/21. As you can see, on 7/21 the value of the schedule is 0.
Nevertheless, the â??User Design Air Flow [m3/s] â?? in â??Zone coolingâ?? for that zone is calculated equal to 0.110 m3/s (=Outdoor Air Flow per Zone in DesignSpecification:OutdoorAir, without considering the schedule).
Here an image from the html report: http://oi58.tinypic.com/rtg85f.jpg
Iâ??ll let you know if Iâ??ll find a solution with the help of the helpdesk.
Best Regards
---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <jeannieboef@...> wrote :
On 07.12.2014, at 16:33, "fpasserini.tn@... [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
In Sizing:System the field "Type of Load to Size On" is "Sensible".
Regards