Dedicated Outdoor Air Systems for HospitalsDesigning energy efficient spaces for healthcare applications presents an enormous challenge, with a variety of different spaces and needs and very strict regulatory requirements. There are many design guides that exist to help create high performance energy efficient hospitals that improve the indoor environment for patients and staff and contribute to the betterment of their surrounding communities.

To that end, ASHRAE has developed an Advanced Energy Design Guide to provide practical and realistic strategies for improving the indoor environment in hospitals, with off-the-shelf technologies, that is free to download and very accessible. It is written in a “how-to” format and recommends several HVAC strategies to achieve a 50% energy savings while improving the indoor environment for the unique hospital requirements.

Recommendations that are applicable to all climate zones include, but are not limited to: water source or ground source heat pump systems (WSHP/GSHP), Dedicated Outdoor Air Systems (DOAS), exhaust air energy recovery and fan arrays.

Minimum total effectiveness recommendations for the energy recovery device are as follows:

Total System Effectiveness with Energy Recovery
Sensible Latent Total
Heating at 100% airflow 78 70 75 
Heating at 75% airflow 83 77 82 
Cooling at 100% airflow 80 71 75 
Cooling at 75% airflow 84 78 82

The energy recovery device should not have a supply side pressure drop greater than 0.85-inch w.c. or 0.65-inch w.c. on the return; while a total energy recovery device should be used, caution should be exercised when employing an enthalpy device for critical spaces.

Venmar CES Dedicated Outdoor Air Solutions® are designed with high efficiency energy recovery technologies at their core and incorporate a variety of extremely efficient options and features to meet or exceed your design objectives such as high efficiency downstream filtration, waterside economizer, a robust washdown cabinet construction and sophisticated and universally compatible controls.

PowerBack Rehabilitation – Voorhees, NJ

PowerBack RehabilitationERV2000 Units with Enthalpy Wheels

  • Fourteen ERV2000 units (combination of indoor and outdoor), ranging from 1,200 to 2,000 cfm used for make-up air to main system geothermal pumps.
  • Units equipped with VFDs and controlled by BMS system CO2 sensors between minimum and maximum requirements.