Hello,
-I am looking to simulate a water-side economizer in EE4 (DOE-2.1E) by
altering the .doe file.
-I have added the highlighted text below into the "Plant-Parameters" section
of the .doe file.
PLANT-PARAMETERS
BOILER-CONTROL = STANDBY
HW-BOILER-HIR = 1.0870
CHILLER-CONTROL = STANDBY
$ Cooling Tower $
TWR-SETPT-CTRL = FIXED
TWR-SETPT-T = 85.0
TWR-DESIGN-WETBULB = 73.0
TWR-DESIGN-APPROACH= 12.0
TWR-DESIGN-RANGE = 10.0
TWR-THROTTLE = 5
TWR-CAP-CTRL = ONE-SPEED-FAN
TWR-CELL-CTRL = MIN-CELLS
DIRECT-COOL-MODE = STRAINER-CYCLE
DC-MAX-OAT = 39.0
DC-MAX-CHILL-WTR-T = 44.0
DC-TWR-WTR-SETPT = 44.0
DIRECT-COOL-KW = 0.055
$ Condenser Water Pumps $
TWR-MOTOR-EFF = 0.917
TWR-IMPELLER-EFF = 0.790
TWR-PUMP-HEAD = 60.00
..
-After running the simulation and comparing it to previous results, there
are savings on "Space Cooling" but there is also a greater energy usage in
"Heat Reject" as show in the table below. The DOE-2 guide suggests entering
the condenser water pumping power as kW/ton but maybe I should be entering 0
for DIRECT-COOL-KW if I'm accounting for the condenser water pumps twice?
This is for a project in Nova Scotia so I think there should be savings from
turning off the chillers throughout the winter but it doesn't make sense
based on these results.
Energy Use Category
Before Change
After Change
Savings
(MBtu)
(MBtu)
(MBtu)
% Sav
Area Lights
2,252.2
2,252.2
0
0.0%
Misc. Equipment
1,629.1
1,629.1
0
0.0%
Space Heat
2,062.0
2,062.0
0
0.0%
Space Cool
615.6
475.7
140
22.7%
Heat Reject
121.5
295.6
-174
-143.3%
Pumps & Misc.
1,136.2
1,136.2
0
0.0%
Vent Fans
2,168.4
2,168.4
0
0.0%
DomHot Water
587.6
587.6
0
0.0%
TOTAL
10,572.6
10,606.8
-34
-0.3%
Best regards,
Jake R. Martell, EIT
