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For air-to-air heat exchangers, rotational speed is not modeled explicitly. The performance of a rotary heat exchanger is modeled through the supply outlet air temperature and frost controls. A plate HX can be bypassed while a rotary HX can change speed to adjust effectiveness. For rotary HXs, the model assumes the HX can achieve the speed needed to provide the control.

From the IDD:

HeatExchanger:AirToAir:SensibleAndLatent,
  A7, \field Supply Air Outlet Temperature Control
    \type choice
    \key No
    \key Yes
    \default No
  A8, \field Heat Exchanger Type
    \type choice
    \key Plate
    \key Rotary
    \default Plate
  A9, \field Frost Control Type
    \type choice
    \key None
    \key ExhaustAirRecirculation
    \key ExhaustOnly
    \key MinimumExhaustTemperature
    \default None