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RE: [EnergyPlus_Support] opaque envelopes performances comparison

Emanuele, 

 

It depends on what you mean by "building performances"  -- loads? or the
energy needed to meet those loads?.   A metric of kwh/m2-yr tells me you
want the energy.  For energy, I believe you need HVAC systema and
purchased air isn't enough.   This is especially true if the HVAC
systems are multizone or include economizers for free cooling.   There
can be many hours during the year where economizer-based free cooling
can meet loads and the purchased air model doesn't do very well here.
In a large multizone building you can have some zones requiring heating
while others require cooling and a central air handler can sort of merge
these loads together via the return air.  However, if your HVAC systems
are single zone, ventilation rates are low, and there is no economizer,
then purchased air could be okay.   Try out the COMPACT:HVAC
preprocessor to simplify setting up HVAC systems. 

 

Brent

 

  _____  

From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Emanuele Naboni
Sent: Thursday, June 22, 2006 12:29 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Cc: 'Tobias Maile'; 'Davide Dell'Oro'
Subject: [EnergyPlus_Support] opaque envelopes performances comparison

 

Gents,

I am doing a research experiment related to study how opaque envelopes
design effects building performances.

Basically the experiment compares different walls:

- high thermal inertia - high insulation - opaque ventilated facades 

And different buildings having different ratio surface / volume

That is related to 6 different climates.

The result would be a table that shows which envelope has better
performance
in different climates and building geometry.

To comparison parameter will be Kwh/m2 per year.

I'm wondering if to get this values I could use a Purchased Air for
evaluate
the different building/envelope performances using the Purchased Air
outputs
to evaluate these performances, rather then set up an HVAC for every
building. 

Thanks everybody for your attention, and please send me any kind of
advises!

Emanuele Naboni

[Non-text portions of this message have been removed]

 



[Non-text portions of this message have been removed]



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