Hi everyone,
I'm trying to see how to apply the exception b in section G3.1.1 related to the peak thermal load for spaces under a baseline system 5 (VAV DX with hot water reheat).
The extract of section G3.1.1 exception b: ?If the baseline HVAC system type is 5, 6, 7, 8, 9, or 10 use separate single-zone systems conforming with the requirements of System 3 or System 4 (depending on building heating source) for any spaces that have peak thermal loads that differ by 10 Btu/h?ft2 or more from the average of other spaces served by the system.?
The spaces under this system have the peak thermal loads below. The average peak cooling is 86 btu/h.ft2.
How would you apply the exception in this case? Would you select a system 3 for all rooms with a cooling load less than 76 btu/h.ft2. and greater than 96 btu/h.ft2.?
I am not sure if my interpretation of this sentence (that differ by 10 Btu/h?ft2 or more from the average of other spaces served by the system?) is correct.
Thanks for any insight you can provide.
SPACE NAME
AREA (SQFT )
COOLING LOAD (BTU/HR)/Ft2
HEATING LOAD (BTU/HR)/Ft2
Incoming Water Room
262
7
12
Staging and Storage
579
4
12
South Corridor
2921
7
15
Electrical Room PH4
689
5
2
Electrical Room
366
6
7
Electrical Room PH3
695
5
2
North Corridor
4273
4
3
Sprinkler Room
285
6
6
Loading Dock
208
5
10
Staff Entry
195
6
9
Electrical Room PH1/PH2
2087
5
5
Security Room
264
13
1
Office Area
4950
26
11
Meet Me Room 2
507
6
2
Meet Me Room 1
1026
6
6
Men?s
516
9
2
Corridor
133
6
6
Women?s
494
9
6
Janitor 1
54
7
3
Janitor 2
77
6
3
UPS Room PH1
1967
373
0
UPS Room PH2
1656
173
0
UPS Room PH3
1121
151
0
UPS Room PH4
1181
144
0
Data Hall PH3/PH4
15935
473
0
Data Hall PH1
8941
419
0
Data Hall PH2
8462
442
0
86
5
Regards,
Hayssam
