Which device is listed as an energy recovery type?

Which device is listed as an energy recovery type?

• A. Heat pipe
• B. Run-around coil
• C. Enthalpy wheels
• D. Activated carbon filters

Answer: (C)

Energy recovery devices move energy from exhaust air to incoming outdoor air to reduce heating and cooling loads. An enthalpy wheel is built to transfer enthalpy, which means it exchanges both sensible heat and moisture between the air streams. This latent energy transfer is what makes it a true energy recovery device in ventilation systems, helping to precondition the air while also regulating humidity. Other options either focus on transferring heat without moisture (heat pipes and run-around coils mainly exchange sensible energy) or don’t transfer energy at all because they’re filtration devices (activated carbon filters). That combination is why the enthalpy wheel is listed as the energy recovery type.

Energy recovery devices move energy from exhaust air to incoming outdoor air to reduce heating and cooling loads. An enthalpy wheel is built to transfer enthalpy, which means it exchanges both sensible heat and moisture between the air streams. This latent energy transfer is what makes it a true energy recovery device in ventilation systems, helping to precondition the air while also regulating humidity. Other options either focus on transferring heat without moisture (heat pipes and run-around coils mainly exchange sensible energy) or don’t transfer energy at all because they’re filtration devices (activated carbon filters). That combination is why the enthalpy wheel is listed as the energy recovery type.