[Bldg-sim] FW: Suspended ceilings vs. open plenums
P. Hay
phay at cwjamaica.com
Thu Jan 8 07:29:42 PST 2009
The study uses both: ducted return in open plenums and plenum return for
suspended ceilings.
Paul Hay
Managing Partner
PAUL HAY Consultants
Capital Project Planning and Management
15a Cassia Park Road
Kingston 10
Jamaica, W.I.
tel: 1 (876) 756-0631
cel: 1 (876) 324-4274
fax: 1 (876) 756-0631
web: www.phcjamaica.com
e-mail: paul.hay at phcjamaica.com
From: Steve Tobin [mailto:stobin at smithboucher.com]
Sent: Thursday, January 08, 2009 10:23 AM
To: phay at phcjamaica.com
Subject: RE: [Bldg-sim] Suspended ceilings vs. open plenums
Does your model include ducted return or plenum return? If it is ducted
return the return air is pulled from the space and the light heat gain is
less load for the AHU. If you have a plenum return the full lighting load
should be accounted for.
Steve Tobin
PROJECT ENGINEER
25501 west valley parkway
olathe ks 66061
direct 913 344.0061
fax 913 345.0617
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of P. Hay
Sent: Thursday, January 08, 2009 9:19 AM
To: BLDG-SIM
Subject: [Bldg-sim] Suspended ceilings vs. open plenums
Hi all,
I recently came across a Life Cycle Analysis of Suspended Ceilings vs. Open
Plenums, initiated by CISCA [Ceiling and Interior System Construction
Association ( www.cisca.org )] which concluded that suspended ceilings are
more energy efficient because they have:
a) higher reflectances,
b) better heat-removal from luminaires, and
c) use lower static pressure and fan power.
I can understand (a) and (c) but (b) leaves me suspicious that the
return-air plenum was not considered in this study. As I understand it,
return-air plenums can be defined as separate zones from the usable spaces
(in this case: an office or a food store) but the suspended ceilings are
adiabatic. So , other than the savings for lighting and fan, I really don't
understand how there could be significant savings for the HVAC system if the
overall height of the rooms (plenum & usable space) is identical, and
cooling load of plenums are considered.
Is there something I'm missing?
Paul Hay
Managing Partner
PAUL HAY Consultants
Capital Project Planning and Management
15a Cassia Park Road
Kingston 10
Jamaica, W.I.
tel: 1 (876) 756-0631
cel: 1 (876) 324-4274
fax: 1 (876) 756-0631
web: www.phcjamaica.com
e-mail: paul.hay at phcjamaica.com
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