[Equest-users] High boiler energy use compared to HW loop demand

[Jeremy McClanathan]

I have had the same problem when I let EQUEST automatically size the boiler for me.  In my situation, EQUEST drastically oversized the boiler so it was running at 10% capacity 90% of the time.  You can check to see if you have the same problem by looking at report PS-C to see what part load range your boiler is operating at.  To fix the problem, first I manually set the capacity of the boiler, which helped a lot, but the program was still over estimating the energy consumption.  Then, I created a custom performance curve using actual data for my boiler.  That solved my problem.

From: Josh Doherty [mailto:jdoherty at dcengineering.net]
Sent: Tuesday, June 16, 2009 10:14 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] High boiler energy use compared to HW loop demand

I have a situation where my boiler energy use (= 950 MBtu) is extremely high compared to the hot water loop demand = 550 MBtu.  The modeled efficiency of the boiler is 80%...which should result in an estimated 690 MBtu of boiler energy use.  Any ideas what could be going on here?  Thanks.

Josh Doherty




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