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

[Thomas Sullivan]

A steam meter assumes that you are using steam from a district plant and
hence would not equal the gas load to a boiler.  The steam is made outside
your model so the heat loss for the steam plant is not included.

 

Sincerely,

Reinhardt Associates, Inc.

 

Thomas J. Sullivan, Jr. PE, LEEDfGA

Sr. Mechanical Engineer

430 Main Street

Suite 200

Agawam, MA 01001

 

413.786.9600 o

413.786.8999 f

 

ü Please consider the environment before printing this e-mail.

 

From: Kelsey VanTassel [mailto:KVanTassel at sustaineng.com] 
Sent: Wednesday, April 28, 2010 12:40 PM
To: Kathryn Kerns; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Steam Meter Energy Usage Much Less Than Gas
Boiler Energy Usage

 

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 |  <mailto:kvantassel at sustaineng.com>
kvantassel at sustaineng.com

 

cid:image001.jpg at 01CAB071.D15FCCF0

 

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

 

2009 Dane County Small Business Award Recipient

 

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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