Minimum Percent Reduction Difference for Replacement Control (%)

{
  "id": "MLC-T-ENV-017427",
  "term": "Minimum Percent Reduction Difference for Replacement Control (%)",
  "field": "Environment",
  "definition": "A constraint for a control strategy that requires each assigned control measure to cause a percent reduction in emissions greater than the specified value in order for the old control measure to be \"replaced by\" the new control measure, according to the formula: (original emissions-new emissions) * 100 / original emissions > min. percent red. diff. For example, by expressing the requirement in this way, it would allow a control with 99.9% efficiency to replace one with 99% efficiency. Note that incremental controls that add an additional device onto a previously controlled source are not yet supported by CoST, except for the Apply Measures in Series strategy type, for which all controls are assumed to be independently applicable. In the event that a combination of two control devices is listed as a control measure (e.g., low NOx burner [LNB] + flue gas recirculation [FGR]) and provides an appropriate level of emissions reduction, that combination control measure can serve as a replacement control for the original measure.",
  "subject": "Air",
  "references": [
    "Control Strategy Tool (CoST) Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/minimum-percent-reduction-difference-for-replacement-control-percent/"
}