HomeMy WebLinkAboutCBPR-6-11-11217 #3 Mech Engineers Repotr.tif 1
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GEORGE O. BROWN & ASSOCIATES, PLLC P.O. BOX 3423
CONSULTING ENGINEERS HICKORY, N.C. 28603
OFFICE (828) 324 -4002
FAX (828) 324 -4012
! June 30, 2011
Catawba County Plan Review
76 North Center St.
Hickory, N.C. 28601
Attn: Bill Rogers
Plan Reviewer
Subj: William Jenkins Building
} Hickory, N.C.
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Dear Bill:
The building cooling load, based on 582 people at 15 cfm per person (8,730 cfm), is approximately 73.1
tons. At the present time, there are six (6) nominal 10 -ton rooftop gaspacks serving the existing building,
for a total existing capacity of 60 tons. My understanding is, that the rooftop gaspacks are equipped with
outside air economizers. Approximately 1,455 cfm outside air would have to be provided through each of
the six (6) gaspacks, or 36% outside air, which is the upper limit of the outside air these systems could
handle. My professional opinion is that the existing rooftop gaspacks have adequate capacity for the
anticipated occupancy of 582 people. My recommendation is to add CO2 sensors to each rooftop gaspack
to track the outside air in direct proportion to the amount of people actually in the space at any given time.
This would save energy and energy cost to the Owner.
If you have any questions or need further assistance, please let us know.
Sincerely,
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GEORGE O. BROWN, P.E.
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