DOE-2 Energy Modeling Summary - Courthouse
Page 23 of 26
Chilled Water Pumps
Chilled Water Pumps
Constant speed primary loop
Variable speed drive on primary loop
Variable speed drive on secondary loop
(in lieu of reset control)
Minimum part load ratio is 30%
No secondary loop
Minimum part load ratio is 50%
Hot Water Pumps (Variable speed)
Hot Water Pumps (Variable speed)
Minimum part load ratio is 30%
Minimum part load ratio is 50%
Cooling Towers
Cooling Towers
Design capacity 85oF
Design capacity 84oF
Maximum cells with lowest fan speed
Minimum cells
Waterside economizer below 50oF
No waterside economizer
Wetbulb reset
Fixed
Tower setpoint is 85oF, but reset based
Tower setpoint is 70oF
on wetbulb
Two speed fans
Two speed fans
Chiller Plant
Chiller Plant
Two 325 ton centrifugal chillers (6.1
Two 390 ton centrifugal chillers
COP @ 100%)
(6.1 COP @ 100%)
One 130 ton screw chiller (4.45 COP @
100%)
100%
0.791 kW/ton
75%
0.677 kW/ton
50%
0.530 kW/ton
25%
0.482 kW/ton
Load Management
Load Management
390 ton chillers staged as needed
First stage: One 130 ton chiller to
operate to 50%
Second stage: One 325 ton chiller up to
80%
Third stage: Two 325 ton chillers up to
95%
Fourth stage: All three chillers operate to
meet maximum load
APPENDIX I - GSA LEED COST STUDY
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