[EnergyPlus_Support] Re: Air infiltration due to natural leakages

["Liam O'Brien" <liambrn@xxxxxxxxx>]

Hi Marcel,

It looks like you set this up right.  But note that 0.5 ach is actually quite high depending on your building type.  I suspect that the 0.5 ach is what was measured at some higher pressure (like 50 Pa) differential during a leakage test.  In reality, under normal circumstances, you can expect much lower infiltration.  It might be closer to 1/20th of this (0.025 ach).  See "Estimation of infiltration from leakage and climate indicators" by Sherman (1987) for details.

You can test to make sure infiltration is working by outputing the following variable: "Zone Infiltration Air Change Rate"

Liam O'Brien

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "marcel.jekel" <jekel.marcel@...> wrote:
>
> Hi,
> 
> I am a beginner on EnergyPlus and am trying to model a small house with
> an infiltration rate due to natural leakages of 0.5 air changes per hour
> (ACH).
> I have set up the following in the idf file:
> ZoneInfiltration:DesignFlowRate,
>      Air_Leakage,             !- Name
>      ZONE ONE,                !- Zone Name
>      Constant,                !- Schedule Name
>      AirChanges/Hour,         !- Design Flow Rate Calculation Method
>      ,                        !- Design Flow Rate {m3/s}
>      ,                        !- Flow per Zone Floor Area {m3/s-m2}
>      ,                        !- Flow per Exterior Surface Area {m3/s-m2}
>      0.5,                     !- Air Changes per Hour
>      1,                       !- Constant Term Coefficient
>      ,                        !- Temperature Term Coefficient
>      ,                        !- Velocity Term Coefficient
>      ;                        !- Velocity Squared Term Coefficient
> Where the "Constant" schedule was obtained from the "schedules" data
> set.
> 
> I have looked at the results of the simulation with the above in place
> (there are no warnings), but it seems that the room remains too warm. I
> am aware that 0.5ACH is not much but I am suspicious that this is not
> being recognised. Have I correctly set this up?
> 
> Thank you in advance
> 
> Marcel
>




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