[Bldg-sim] Process fluid cooler simulation using eQuest

Aulbach, John jaulbach at nexant.com
Fri Aug 15 14:22:50 PDT 2008

You would need to contact Steve Gates (steve.gates at doe2.com) to assess
the algorithm concerns.
I believe you can adjust the flow rate proportionally for an non water
fluid simply based on density versus density of water. I have used this
to adjust flow where ethylene-glycol is mixed with the water.
Let us know how it worked.
John R. Aulbach, PE, CEM
Project Manager
Nexant, Inc.
701 West Kimberly Ave., Suite 245
Placentia, CA 92870-6342 USA
Phone: 714-524-4402
Fax: 714-524-4407
email: jaulbach at nexant.com


From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Lynn
Sent: Friday, August 15, 2008 11:33 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Process fluid cooler simulation using eQuest



I have a need to simulate the performance of a hypothetical fluid cooler
applied to a condenser of a distillation process. I am trying to
determine the energy consumption that is being avoided by the
installation of heat exchangers that are effectively serving the
condensing function. I have data to determine actual hourly values of
heat rejection (BTU/hr), fluid (not water) temperatures and flow rates
and should be able to obtain hourly weather data for the period
corresponding to the data. I can get design values for the fluid cooler
from a vendor. I only need to determine the energy consumed by the fluid
cooler - no other building energy is of interest. I am thinking I may be
able to do this in eQuest, assigning a process load to the fluid cooler
after developing a schedule from the data I have and putting a meter on
the fluid cooler. My concerns are that the fluid is not water (I have
been unsuccessful in the past specifying non-H2O cooling fluids) and
that the temperatures (cooling from 235 degF to 200 degF) may be out of
range for the algorithms. Anyone see any flaws in this approach before I
propose it?


Thanks in advance.


R. Lynn Qualmann, P.E.

SBW Consulting, Inc.


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