RE: [EnergyPlus_Support] Re: Program ceiling fan on the E+

If cold air is blown into the attic, the RDC temperature will be lowered.

If hotter air is blown into the attic, the RDC temperature will be raised.

If no air is used to change the attic temperature, the attic temperature will be dependent on the conduction from the roof and RDC.

If the sun is not shining, the attic temperature will be lowered to that of RDC, which is loer than the outside air temperature and higher than the ground temperature..

You do not need simulation to illustrate these. Draw a simple diagram by entering some estimated temperature values.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: pierreavisse@xxxxxxxxx
Date: Sun, 31 Jul 2011 21:25:17 -0700
Subject: Re: [EnergyPlus_Support] Re: Program ceiling fan on the E+

Thank again for your answer.

Before i want to precise you that i simulate in Réunion Island. And my project is to shows that when we build with insulation formwork block (like to use 10cm of insulation) ( if you don't knows it you can't see on "quad-lock" web site) , we don't have need of air conditionning. It's for that there is not HVAC equipment.

So i do that you say me

Then i remove the ventilation in attic zone. I cancel it.

And i obtain strange result.

For you must understand, i call essai 1 when there is attic ventilation and essai 2 when there isn't attic ventilation.

The temperature of rdc zone is smaller in essai 2 , but the temperature in attic zone is smaller in essai 1. that it is up to half month of january, and after this date the temperature of rdc zones is the same in two essai.

I don't understand.

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: Linda Lawrie <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Friday, July 29, 2011 8:54 PM
Subject: RE: [EnergyPlus_Support] Re: Program ceiling fan on the E+

You have let the attic area open. That may be the reason why the roof insulation has no effect on the room below the ceiling.
=========================

ZoneVentilation:WindandStackOpenArea,
Ventilation toit, !- Name
Attic1, !- Zone Name
10, !- Opening Area {m2}
Ventilation toit, !- Opening Area Fraction Schedule Name
autocalculate, !- Opening Effectiveness {dimensionless}
, !- Effective Angle {deg}
0, !- Height Difference {m}
...
.....
=======================
Your IDF was coded to simulate for WInter condition only. There is no HVAC equipment. The room is heated by the ground heat through the floor.

The building ground temperature was assumed to be 18°C, as no values were entered.
Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: pierreavisse@xxxxxxxxx
Date: Fri, 29 Jul 2011 05:32:17 -0700
Subject: Re: [EnergyPlus_Support] Re: Program ceiling fan on the E+

I want to see the effect of the modification to the insulation under the roof.

But when i change it, there no change at température opérative in RDC's zone.

I joint my idf files. If you want better understand.

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: Linda Lawrie <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Friday, July 29, 2011 4:01 PM
Subject: RE: [EnergyPlus_Support] Re: Program ceiling fan on the E+

Is not that what you wanted by using insulation on the ceiling? to minimize the heat transfer across the ceiling in Winter.

Houses in Canada usually has ceiling insulation of R24 or more. The attic space itself is vented to the outside air.

If your ceiling constructin is not for heat isolation, then the temperature difference would be low.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: pierreavisse@xxxxxxxxx
Date: Fri, 29 Jul 2011 11:17:58 +0000
Subject: [EnergyPlus_Support] Re: Program ceiling fan on the E+

Hy,

I have a other problems.

My house has two zones. (RDC and the attic)

When i change the thickness of isolation under the roof, I have a different temprature in the attic zones, but there are no difference in RDC zones. And it is like that when i use a cold weather or a hot wheather.

More, the température of floor in attic zone is ten more deggree than ceiling of rdc zones in summer, and the floor in attic zone is ten less deggres than the ceiling of rdc zones in winter.

I guest there is not transfert between both zones.

Can you explain me that, please.

Thanks

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