[Bldg-sim] Middle School - DHW & Ventilation

Miller, Nathan nathan.miller at stantec.com
Fri Feb 8 09:27:58 PST 2008


Varkie,
 
Table G-M of the ASHRAE 90.1-2004 User's Manual (note this is a
different document than the standard itself) provides occupancy,
lighting, HVAC, Domestic Hot Water, and Elevator schedules for school
buildings. I use these schedules all the time, especially since it is
the only place I have seen an elevator schedule. The table includes this
note:
Schedules for occupancy, lighting, receptacle, HVAC system, and service
hot water are from ASHRAE Standard 90.1-1989 and addendums, except that
5% emergency lighting has been added for all off hours. Elevator
schedules, except for restaurants, are from the U.S. Department of
Energy Standard Evaluation Techniques except changed to 0% when
occupancy is 0%. These values may be used only if actual schedules are
not known.

Also, ASHRAE 90.1-2004 Appendix G lets you take advantage of both
improving the efficiency of the water heating equipment and reducing the
hot water demand (I think this was in one of the addenda). To be honest,
usually I just use the default domestic hot water demand schedules and
capacities within eQUEST for the building type I am modeling, and then
apply the hot water heater efficiency to that.

Hope this helps,

Nathan Miller
Stantec


________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Varkie
Thomas
Sent: Friday, February 08, 2008 9:10 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Middle School - DHW & Ventilation



The Middle School in question has 170,000 sqft and about 2000 students.
It has science labs, cafeteria, gymnasium, toilets and showers besides,
classrooms, offices, library and computer labs.  I am looking for design
criteria and schedules.  Is there published information, examples or
case studies for estimating Domestic Hot Water and Ventilation
requirements?  What are the options for saving energy in these two cases
based on ASHRAE Std90?  I presently model occupancy-based-sensors by
adjusting the design ventilation schedule by the occupancy schedule.
Can you reduce the ventilation rates if carbon and ionization filters
are used?  What are the drawbacks?

Varkie

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