[Equest-users] Modeling Hybrid HVAC system

[Jason Cocek]

Hello All,

 

This is a repost with a hopefully better explanation of the system that we
are trying to model. We have a campus project with a unique HVAC system for
cooling that reuses return water from a central plant that has already
circulated to other campus buildings. Outside air is taken in and cooled
first through an energy recovery wheel (using building exhaust), then sent
through a pre-cool coil that uses 55°F return water from the central plant
return loop to cool the air from 105F to 65°F. This air is sent through a DX
cooling coil of a water source heat pump and further cooled to 48°F and then
mixed with return air that has been cooled to 58°F also using a portion of
the  55°F return water from the central plant. The water leaving both the
return air and outside air pre-cooling water coils is used for heat
rejection of the water source heat pump, which returns 75F water to the
central plant. We are at a loss as to how to model this system, if it is
even possible. If anyone has seen a system like this, your help would be
greatly appreciated.

 

Thanks!

 

Jason Cocek, LEED AP O+M

 

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