SEMCO True 3Å enthalpy exchanger recovers both sensible (temperature) and latent (moisture) energy, and does so far more effectively than other competitive offerings. This performance edge is a result of True 3Ås unique transfer core.
Dec 13, 2012 · Enthalpy Wheel vs. Sensible Heat Wheel Total Energy Recovery E s = W s (X 1 X 2) Wmin (X 1 X 3) W = Mass Flow Y = Dry Bulb, Humidity, Enthalpy OA EA Æ Æ Sensible Energy Recovery Supply Effectiveness = E s = T 2 T 1 (Supply Energy Transfer) T 3T 1 Water vapor in outdoor air stream is adsorbed on the desiccant Because the water vapor pressure in the Energy Recovery Ventilator - an overview ScienceDirect An energy recovery ventilator (ERV) is a type of mechanical equipment that features a heat exchanger combined with a ventilation system for providing controlled ventilation into a building. This type of equipment was introduced as air-to-air heat exchangers in the colder regions of the U.S., Canada, Europe, and Scandinavia.
Ventilation systems that transfer both sensible and latent heat (total enthalpy) are referred to as ERV, while those that only transfer sensible heat are called heat recovery ventilation (HRV). ERV has the ability to modify humidity levels; HRV does not. Typically, HRV systems do not meet the 50 percent energy recovery effectiveness required by Enthalpy Energy Recovery - Zehnder Group UKChoosing the enthalpy exchanger, rather than the standard heat exchanger, means that the unit becomes an Energy Recovery Ventilation (ERV) system, as opposed to solely a Heat Recovery Ventilation (HRV) system.
The enthalpy transfer efficiency for an heat recovery unit can be calculated as. e = (h 2 - h 1) / (h 3 - h 1) (3) where. e = enthalpy transfer efficiency. h 1 = enthalpy in outside make-up air before the heat exchanger (kJ/kg, Btu/lb) h 2 = enthalpy in outside make-up air after the heat exchanger (kJ/kg, Btu/lb) Trane Engineers Newsletter, Vol. 29 No. 5overall energy transfer decreases. How much heat will a total-energy recovery device transfer? The answer lies in this equation:where:Q t = total heat flow, Btu/h V min = the smaller airflow (supply or exhaust), cfm h 1 = entering supply-air enthalpy, Btu/lb h 3 = entering exhaust-air enthalpy, Btu/lb For sensible heat transfer, where:Q s= sensible heat flow, Btu/h t
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