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[EnergyPlus_Support] Re: Night Ventilation
I'm still missing something basic:
When I defined the object within ZoneVentilation:DesignFlowRate I included parameters to describe a fan, including fan static pressure, efficiency, etc.
In reality, this nighttime exhaust fan is a separate piece of equipment. Makeup air would be brought in by opening windows.
So, yes, I don't understand how to model this. I do need more detailed guidance, please. I have combed through the example file :
5ZoneNightVent2.idf and it seems like that model uses the same basic idea - ZoneVentilation:DesignFlowRate objects are populated.
Thanks.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
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> I had a quick look at your IDF and ran one simulaation.
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> You have a heating coil, a cooling coil, and a constant volume fan in the air loop. There is no outside air intake, or mixer.
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> The WHF schedule is set, but there is nothing to control.
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> I do not know how much guidance you need to fix the problems.
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> The nearest example for you is to use the outside air intake in the economy cycle, which has an outside air mixer in the air loop. Depending on the temperature difference, the amount of outside air is varied.
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> If you wanted to use the fan as a separate component, it may be possible. The difference in temperature which is set in the design flow rate object is that between the zone and the outdoor air in the weather file. The ventilation is turned on, and hope that the injected air will change the cooling rate at the coil. It can work in Winter during the day time as well, when the OA is warmer than the setpoint..
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> So let me know what you can change and I will try to answer your questions.
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> I have turned on the diagnostics to see all the warnings and unused objects and schedules. There are many warnings, but the simulation was meaningful on all the working parts..
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> Dr. Li
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> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: neil@...
> Date: Thu, 12 Aug 2010 01:33:51 -0500
> Subject: RE: [EnergyPlus_Support] Re: Night Ventilation
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> I did attach my idf file - If you have a chance to look at it, that would be appreciated.
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> I don't see the connection from ZoneVentilation:DesignFlowRate to "monitoring the outdoor and indoor temperature difference". This object has parameters for "Minimum Indoor Temperature" and " Delta Temperature", which should define allow or disallow ventilation. Or do I need to reference outside air temperature somewhere? BTW, I checked with what the sample 5ZZoneNightVent2.idf file uses as parameters.
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> Thanks
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> ----- Original Message ----- Deleted.
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