[Bldg-sim] FW: Electric sub-meter

[Keith Swartz]

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