Question-and-Answer Resource for the Building Energy Modeling Community
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For pumps, it is usually enough to just replace the pump with a variable speed. You might check if you are getting flow in bypass branches and if there is flow it may be desirable to remove the bypasses.
For air systems, you have more to do than just replace the fan. The air system generally needs to be changed from a constant-volume-variable-temperature control approach to a constant-temperature-variable-flow approach. The zone's air terminal unit will need to be changed to one of the VAV types. The supply air deck temperature needs to be controlled with a setpoint manager.
