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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
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 -----
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:
good luck
Alec
----- Original Message -----
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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