[Equest-users] Steam Meter Energy Usage Much Less Than Gas Boiler Energy Usage

[Kelsey VanTassel]

I had the same problem when I wanted to use a steam meter on a DHW loop. The only thing I can think of is that the steam meter doesn't account for storage losses. It does seem like a suspiciously large difference, though.

Kelsey Van Tassel
Mechanical Engineer | kvantassel at sustaineng.com<mailto:kvantassel at sustaineng.com>

[cid:image001.jpg at 01CAE6C7.922A8160]

We've moved. Please see below for my new contact info.

901 Deming Way, Ste. 201
Madison, WI 53717
608.836.4488 ext. 20| Fax: 608.836.4477

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kathryn Kerns
Sent: Wednesday, April 28, 2010 11:33 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Steam Meter Energy Usage Much Less Than Gas Boiler Energy Usage


Everyone, I have a building in Fairbanks Alaska that uses hot water heat. I built an energy model for it and included a gas, natural draft, 80% efficient boiler to heat the hot water. I then deleted the gas hot water boiler and substituted a steam meter. I repeated this process for the gas DHW heater. When I ran the steam heat meter energy model, I noticed that the Heating Energy Consumption was reduced by 38% compared to the gas energy model. Nothing else seemed to change much, but the reduction of heating energy bothers me. I realize that a steam to hot water heat exchanger is more efficient than a boiler, but why does the amount of heating energy required drop so much? Shouldn't the amount of heat required be the same for both models?  I have attached the Energy Consumption reports for both models. Thanks.



Kathryn Kerns

Systems Specialist

BCE Engineers, Inc.

| Ph: 253.922.0446 | Fx: 253.922.0896 |


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