[BLDG-SIM] eQuest Dbl Skin Sim

["Aulbach, John" <JAulbach@xxxxxxxxxxxxxxxxxxx>]

What is a double skinned building? The term is unfamiliar to me..

-----Original Message-----
From: Fred Porter [mailto:fporter@xxxxxxxxxxxxxx]
Sent: Wednesday, January 28, 2004 5:48 PM
To: BLDG-SIM@xxxxxxxx
Subject: [BLDG-SIM] eQuest Dbl Skin Sim


The only way a double skin pays off is if it replaces most of the VAC 
part of the HVAC system, greatly decreasing the net cost in the payback 
numerator. This may only be possible where the design conditions are  
moderate such as northern Europe or some maritime climates. High Euro 
energy costs, and use of the interstitial space for daylighting 
parephenalia will increase the denominator.

If that is possible, the numbers might look like 
($15-10+)/($0.31*2+/year) equals under 9 years. The architect gets a 
"transparent" building, and it might be worth the simulation time. But 
you might not want to hang out on the top floor during a heat storm like 
last summer's.


stvgates@xxxxxxxxxxx wrote:

>
>1.  Assume your building costs $150/sq.ft. to build, and that the
>double-skin is 10% of that cost, or $15.
>2.  Assume that energy for the building costs $1.25/sq.ft./year, and that
>the double-skin saves 25% of the total energy budget, or $0.31/sq.ft./year.
>(In many buildings, lights and plug loads comprise about half the energy
>cost, and this analysis assumes the double-skin has no impact on either.
So
>this guestimate is based on the double skin saving 50% of the HVAC costs,
>which seems quite optimistic.)
>3.  The simple payback is then $15/$0.31 = 48 years.  
>

-- 
Fred W. Porter 

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