AHRI 550/590 condenser relief for chillers

asked 2017-12-11 11:42:47 -0500

Matt Koch gravatar image

For air-cooled and water-cooled chillers, AHRI 550/590 provides a condenser relief with part load ratio (not with OA temperature) as follows:

air-cooled: 95 oF @ 100%, 80 oF @ 75%, 65 oF @ 50%, 55 oF @ 25%

water-cooled: 85 oF @ 100%, 75 oF @ 75%, 65 oF @ 50%, 65 oF @ 25%

OpenStudio provides for a Setpoint Manager Outdoor Air Reset or a Setpoint Manager Follow Outdoor Air Temperature, but I have not seen a Setpoint Manager "Part Load Ratio". Is there a way to accommodate the AHRI condenser relief into a setpoint manager? I am currently using Setpoint Manager Scheduled on my condenser water loop, which presumably keeps it at 85 oF year-round, if possible. As far as I can tell, this does not allow the simulation to take advantage of the relief.

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