Energy Recovery
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This incentive is available for the installation of heat exchangers to reclaim waste energy from exhaust air streams, transferring it to outside makeup air streams before mechanical conditioning.
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Required Documentation:
• Mechanical drawings and schedules indicating ventilation CFM or supporting documentation.
• Detailed specifications of the heat exchanger and evidence of its capacity to recover waste energy efficiently (i.e. The sensible heat exchanger is assumed to have a recovery effectiveness of 0.55; while the enthalpy wheel is assumed to have a sensible and latent recovery effectiveness of 0.70, as per MEMD).
• If applicable, schematics or operational descriptions illustrating the integration of an air stream bypass for economizer mode operation.
• Applicability: Eligible for retrofit projects, equipment replacement, or new construction installations (if not mandated codes).
• Baseline Efficiency: No existing heat recovery from exhaust air stream in question.
• Qualifying Efficiency Requirement: The Installation of an effective ERV, suitable for the specific HVAC system (natural gas space heating) and operational requirements of the facility.
• Exclusions:
o Cannot be combined with other heat recovery measures, such as stack economizers.
o Cannot be in conjunction with high-efficiency furnace and boiler measures as described in section 1.3.
o Spaces where heat recovery is already required by code.
• Important Consideration:
o The ERVs shall not affect the system’s overall performance or indoor air quality. Additionally, the system should be equipped with an air stream bypass to allow for economizer mode operation when conditions permit, further enhancing energy savings.