[Bldg-sim] M&V metering of VRF systems

[David Eldridge]

Fan power for the FCU/cassettes may be supplied separately in your building, so that maybe monitored if the distribution is separated from other electrical distribution in your building. If the project is residential however, these may be in common with the rest of the circuits for each apartment. In that case the M&V may have to focus on monitoring by apartment rather than end-use.

For heating/cooling you’ll need to trend status of the equipment, along with power consumption in order to determine end-use. At times the unit may be capable of producing heating and cooling at the same time if your system has that added functionality, which may not be allocated to end-use in the same manner as the simulation program.

In terms of M&V, the power use seems to be more important for your plan than actually applying towards heating or cooling end-use.

David



David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
Grumman/Butkus Associates





-----Original Message-----
From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher
Sent: Thursday, May 22, 2014 1:03 PM
To: bldg
Subject: [Bldg-sim] M&V metering of VRF systems



I am developing an M&V plan for a building with a VRF system.  I am wondering if it is possible to meter the heating, cooling and fan energy of the VRF units given that the unit power is provided by a single feed.



It seems like a complex task to accurately measure the heating and cooling energy given that the system includes the VRF cassettes, water cooled condenser, the fluid cooler, the branch controllers, and the boiler.



Thanks for any insights!



Christopher Jones, P.Eng.

Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527




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