ASHAE 90.1 baseline system exception G3.1.1b

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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

Hayssam Barhoun3's picture
Joined: 2014-12-12
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