[BLDG-SIM] Closed circuit cooling tower in DOE2.1E
mbusman at noresco.com
mbusman at noresco.com
Wed Mar 24 06:52:41 PST 2004
Konstantin,
What front end are you using to insulate you from having to deal with text
at the BDL level? Our office has been using Visual DOE for about 7 years
now and the central plant editor allows you to specify a closed cooling
tower. Anyway, I did a quick sample run specifying a low efficiency (as
noted by the high approach) closed tower and the BDL text the program wrote
looks something like what I have below. If your GUI front end doesn't allow
a closed tower, you might have to roll up your sleeves and insert similar
text into the input file. Make sure to change parameters as appropriate.
Good luck.
Mike Busman
NORESCO, LLC
*3143 * $Cooling Tower<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" />
*3144 * TOWER0 = PLANT-EQUIPMENT
*3145 * TYPE = CLOSED-TWR
*3146 * SIZE = -999
*3147 * INSTALLED-NUMBER = 1
*3148 * MAX-NUMBER-AVAILABLE = 1
*3149 * ..
*3150 *
*3151 * PART-LOAD-RATIO
*3152 * TYPE = CLOSED-TWR
*3153 * ELEC-INPUT-RATIO = 0.0081
*3154 * ..
*3155 *
*3156 * PLANT-PARAMETERS
*3157 *
*3158 * $Electric Compression Chiller
*3159 * OPEN-CENT-COND-TYPE = TOWER
*3160 * OPEN-CENT-UNL-RAT = .1
*3161 *
*3162 * $Compression chiller('s) condenser and evaporator water flow
*3163 * $ includes evaporator flow for two-loop systems.
*3164 * COMP-TO-TWR-WTR = 6
*3165 * CHILL-WTR-T = 44
*3166 *
*3167 * $Fuel Hot Water Plant Boiler.
*3168 * HW-BOILER-HIR = 1.666667
*3169 *
*3170 * $Tower
*3171 * TWR-DESIGN-APPROACH = 20
*3172 * TWR-DESIGN-RANGE = 10
*3173 * TWR-DESIGN-WETBULB = 78
*3174 * TWR-SETPT-CTRL = FIXED
*3175 * TWR-SETPT-T = 85
*3176 * TWR-THROTTLE = 10
*3177 * MIN-TWR-WTR-T = 66
*3178 * TWR-CAP-CTRL = ONE-SPEED-FAN
*3179 * DIRECT-COOL-MODE = NOT-AVAILABLE
*3180 * $ Condenser pump includes a weighted average including all
*3181 * $ the evaporator and condenser pumps for water cooled
chillers
*3182 * TWR-PUMP-HEAD = 10.0
*3183 * TWR-IMPELLER-EFF = 0.77
*3184 * TWR-MOTOR-EFF = 0.9
*3185 *
-----Original Message-----
From: Konstantin Babets [mailto:babetsk at jbb.com]
Sent: Wednesday, March 24, 2004 6:13 AM
To: mbusman at noresco.com; BLDG-SIM at gard.com
Subject: Re: [BLDG-SIM] Closed circuit cooling tower in DOE2.1E
Thanks to everybody for helping with my river water cooling problem. I found
that using hourly output and programming excell spreadsheet was the way to
go.
Here is another problem. How can I approach modeling a closed circuit
cooling tower in DOE2.1E?
Konstantin Babets
Jaros Baum and Bolles
Consulting Engineers
212 530 9455
----- Original Message -----
From: mbusman at noresco.com <mailto:mbusman at noresco.com>
To: babetsk at jbb.com <mailto:babetsk at jbb.com> ; BLDG-SIM at gard.com
<mailto:BLDG-SIM at gard.com>
Sent: Thursday, March 18, 2004 12:20 PM
Subject: RE: [BLDG-SIM] River water cooling
Konstantin,
I have become a big fan of the hourly output report capabilities of DOE-2
for presentation purposes, troubleshooting, and to handle situations such as
yours where I'm not aware of how to approach the solution within DOE-2.
You could probably run an hourly report to export systems tons load, CHW
supply temperature, and any other variables you might need (CHW pump kW,
condenser pump kW, lighting kW, etc.) and dump the 8760 hours of data into
an Excel file. Based on your CHW pump kW, you might want to add a column to
account for pump heat to give you total cooling load seen by the chiller.
Then you need to add 3 columns to calculate from the DOE chiller curve
coefficients the multiplier for capacity based on CHW and CW temp. (I assume
you have a good idea of the variation in river water temp. by season),
multiplier for EIR based on the water temperatures, and EIR-FPLR. The
product of these three values should give you the hourly EIR. Add another
column so that based on the total tons cooling load, you can then calculate
chiller kW from the hourly EIR.
It might end up being a big spreadsheet, but it's really simple in concept
to set up and should give you the results you desire. If you'd like to
discuss further, feel free to call me.
Mike Busman
NORESCO, LLC
949-253-3533, ext. 303
-----Original Message-----
From: Konstantin Babets [mailto:babetsk at jbb.com]
Sent: Thursday, March 18, 2004 7:52 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] River water cooling
Alec, thank you.
Unfortunately I am using Doe2.1E, where I cannot schedule loop temperatures.
BTW, is it possible to write a custom function to access the PLANT? It does
look like I can only use custom functions to modify computations in Loads
and Systems.
Any ideas?
Konstantin Babets
Jaros Baum and Bolles
Consulting Engineers
212 530 9455
----- Original Message -----
From: Alec <mailto:astevens at dmiinc.com> Stevens
To: babetsk at jbb.com <mailto:babetsk at jbb.com>
Sent: Wednesday, March 17, 2004 6:02 PM
Subject: Re: [BLDG-SIM] River water cooling
Konstantin,
Not 100% sure, but I think you should be able to schedule the loop
temperature. Create day/week/year schedules and input the appropriate
variation in river water temp, use that for loop temp.
I know you can do this for ground source loop temperature for a WLHP system,
so it should be applicable to CW loop.
just for fun:
http://www.utilities.cornell.edu/LSC/default.htm
<http://www.utilities.cornell.edu/LSC/default.htm>
good luck
Alec
----- Original Message -----
From: Konstantin <mailto:babetsk at jbb.com> Babets
To: BLDG-SIM at gard.com <mailto:BLDG-SIM at gard.com>
Sent: Wednesday, March 17, 2004 4:53 PM
Subject: [BLDG-SIM] River water cooling
Hello,
I am working on a project that considers utilizing river water instead of a
conventional cooling tower condenser water. Does anyone have an idea how
could this be simulated in DOE2.1? (Basically, somehow I need to reset
entering condenser water temperature to that of a river water).
Thank you,
Konstantin Babets
Jaros Baum and Bolles
Consulting Engineers
212 530 9455
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