[Bldg-sim] FW: Electric sub-meter

[Abaza Hussein]

Thank you all; till now, I could not find a stand alone system that measures
the Kwh for multi circuits control panel. The HOBO system can do that, but
only by tweaking the system and having many extra equipment (cost will be
over $7,000.00). I do not know why I could not digest the idea that a multi
circuit Kwh monitoring system does not exist!

H

 

 

Hussein Abaza, Ph.D.

School of Architecture, CET, and Construction

Construction Management Department 

Phone 678-915-3719

Fax: 678-915-4966

Email  <mailto:ahussein at spsu.edu> ahussein at spsu.edu

 

  _____  

From: Jeff Hirsch [mailto:Jeff.Hirsch at DOE2.com] 
Sent: Tuesday, April 28, 2009 11:30 AM
To: Keith Swartz; ahussein at spsu.edu
Subject: Re: [Bldg-sim] FW: Electric sub-meter

 

measurement of just amps is not a good idea in most areas we have worked

within, especially in residential districts.  For utilities in CA the
voltage variations

are too significant to get a result within a few percent. Differential
compressor

loading during the day also causes some variation in power factor.  Best to

measure true power if you want better than +-20%.

--- 
Jeff Hirsch
James J. Hirsch & Associates
12185 Presilla Road
Camarillo, CA 93012-9243 USA
phone: (805) 553-9000
fax: (805) 532-2401
email: Jeff.Hirsch at DOE2.com
web: http://DOE2.com
skype: jeffhirschcamarillo 



----- Original Message ----- 

From: Keith Swartz <mailto:kswartz at ecw.org>  

To: ahussein at spsu.edu 

Cc: bldg-sim at lists.onebuilding.org 

Sent: Tuesday, April 28, 2009 7:38 AM

Subject: [Bldg-sim] FW: Electric sub-meter

 

Hussein,

A colleague of mine, who specializes in residential energy, has some
recommendations below for electric sub-meters.

_____________________

Keith Swartz, P.E., LEED AP
Energy Engineer / Senior Project Manager
Energy Center of Wisconsin
455 Science Drive, Suite 200
Madison, WI 53711
Phone: 608.238.8276 x123
Fax: 608.238.0523
Email: kswartz at ecw.org
Web: www.ecw.org

Energy Center University
Your gateway to sustainable design training and online education programs.
www.ecw.org/university/

-----Original Message-----
From: Scott Pigg
Sent: Monday, April 27, 2009 10:03 AM
To: Keith Swartz
Subject: RE: [Bldg-sim] Electric sub-meter


Not sure if this is for permanent or temporary (research purposes).  If the
latter, Onset (www.onsetcomp.com) makes some multi-circuit data loggers for
power monitoring.  Also Dent instruments.

As far as low-cost monitoring of HVAC compressors, I have had good look by
simply monitoring amps (say a snapshot of amp draw every 90 seconds), and
combining w/ a one-time measurement of voltage and power factor.  On a daily
basis, the average of all those amperage measurements works out to a good
estimate of daily kWh within a percent or two (I've had a couple of
opportunities to cross-check against actual daily kWh).  It's much cheaper
(both in terms of equipment costs and installation time) to track amperage
than actual kWh or watts.

Scott

-----Original Message-----
From: Keith Swartz
Sent: Monday, April 27, 2009 9:27 AM
To: Scott Pigg
Subject: FW: [Bldg-sim] Electric sub-meter

Scott,

Do you have any recommendations for home submeters for the gentleman below?

_____________________

Keith Swartz, P.E., LEED AP
Energy Engineer / Senior Project Manager
Energy Center of Wisconsin
455 Science Drive, Suite 200
Madison, WI 53711
Phone: 608.238.8276 x123
Fax: 608.238.0523
Email: kswartz at ecw.org
Web: www.ecw.org

Energy Center University
Your gateway to sustainable design training and online education programs.
www.ecw.org/university/


-----Original Message-----
From: Abaza Hussein [mailto:ahussein at spsu.edu]
Sent: Saturday, April 25, 2009 11:30 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Electric sub-meter

Could any one help in recommending a multi circuit sub-meter to monitor
energy consumption in houses. and also low-cost submeters to monitor the
HVAC compressor electric consumption (since I need many of them).
Thank you
H. Abaza
SPSU

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