[BLDG-SIM] eQuest Dbl Skin Sim
Aulbach, John
JAulbach at semprasolutions.com
Wed Jan 28 18:10:41 PST 2004
What is a double skinned building? The term is unfamiliar to me..
-----Original Message-----
From: Fred Porter [mailto:fporter at archenergy.com]
Sent: Wednesday, January 28, 2004 5:48 PM
To: BLDG-SIM at GARD.COM
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 at pacbell.net 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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