ERVRatio ==================================================================== Brief Description ------------------------------------------------------------------------------- Erv ratio of at least 50% Detailed Description ------------------------------------------------------------------------------- Energy recovery systems required by this section shall result in an enthalpy recovery ratio of at least 50%. a 50% enthalpy recovery ratio shall mean a change in the enthalpy of the outdoor air supply equal to 50% of the difference between the outdoor air and entering exhaust air enthalpies at design conditions. Index Description ------------------------------------------------------------------------------- * Section 6.5.6.1 in 90.1-2016 Datapoints Description ------------------------------------------------------------------------------- * enthalpy_air_outdoor: Outdoor air enthalpy * enthalpy_air_return: Return air enthalpy * enthalpy_air_outdoor_erv: Outdoor air enthalpy after ERV Assertions Description ------------------------------------------------------------------------------- * (enthalpy_air_outdoor_erv - enthalpy_air_outdoor)/(enthalpy_air_return - enthalpy_air_outdoor) >= 50% happens at least once in winter design day Type Verification Description ------------------------------------------------------------------------------- Procedure-based Assertions Type ------------------------------------------------------------------------------- Pass