VRF Performance Curves for Mitsubishi - low ambient heating performance

1 post / 0 new

Hi Christophe,
I agree that there is no obvious way to add supplemental heat to VRF systems in DOE-2.3 for simulating cold climate performance. If you are designing a system and the simulation is showing unmet hours, you could change the capacities of indoor and outdoor units. If it is an existing system and/or the system capacities are locked, you could add heat using baseboards, a DOAS unit, or an additional terminal unit in an adjacent zone separated by an air wall. You can add energy to represent electric resistance heat in the Miscellaneous tab of the Condensing Unit (as crankcase or auxiliary power) but it will not add actual heating capacity to the unit.

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer

[Pathfinder-EA-logo-2]T: (585) 698-1956 F: (585) 325-6005
bbishop at pathfinder-ea.com www.pathfinder-ea.com
134 South Fitzhugh Street
Rochester, NY 14608 [cid:image004.png at 01D68CC5.241AA420] Ask me why Carbon Fee & Dividend may be right for you.

Bill Bishop's picture
Joined: 2012-02-25
Reputation: 7