Temperature effectiveness (sensible) Temperature effectiveness compares supply temperature change to the maximum possible: epsilon_T = (T_supply_out - T_supply_in) / (T_exhaust_in - T_supply_in) This is the number a sensible plate reports, and it is what most generic "efficiency" labels mean. Dew-point effectiveness (total / enthalpy) For an enthalpy wheel or membrane, moisture matters, so effectiveness is […]
Rotary Wheel Purge Sector: How Wheels Reduce Carryover
What a purge sector is A rotary energy wheel spins exhaust and supply airstreams through the same matrix, so a small amount of exhaust gas and moisture is inevitably carried into the supply. A purge sector is a slice of the wheel (typically 5-15 degrees) where a portion of the clean supply air is directed […]