23 72 00 AIR-TO-AIR ENERGY RECOVERY EQUIPMENT

.01 General

1. Refer to 01 80 00 PERFORMANCE REQUIREMENTS.  In general, apply energy recovery equipment in accordance with current edition of ASHRAE Standard 189.1 Standard for the Design of High-Performance Green Buildings: Energy Efficiency - Prescriptive Option.
1. The Standard 189.1 supersedes the minimum requirements in International Energy Conservation Code/ASHRAE 90.1.  It requires energy recovery equipment when the system’s supply airflow rate exceeds the associated tabular values based on the climate zone and percentage of outdoor air at design conditions.
2. The energy recovery system effectiveness required by Standard 189.1 is also more stringent than the current minimum building code requirements.
3. Provisions shall be made to bypass or control the energy recovery system to permit air economizer operation as required elsewhere in the Standard 189.1.
4. Exceptions:
1. Do not apply rotary energy recovery wheels to systems with risk of cross leakage from contaminated air streams such as chemical lab fume hood exhaust or animal facilities.  Use equipment with no potential for cross leakage.
2. Submit cost analysis and control sequence for approval prior to submission of final review drawings.
3. In general, any factory-assembled air handling units with energy recovery equipment shall comply with requirements in 23 73 00 AIR-HANDLING UNITS.  
4. Additional Design Resources:  
1. ASHRAE Systems and Equipment Handbook (current edition); Air-to-Air Energy Recovery Equipment
2. ASHRAE GreenGuide: The Design, Construction and Operation of Sustainable Buildings, current edition.
3. National Institute of Building Sciences (NIBS) - Whole Building Design Guide; HVAC and Refrigerating Engineering; High-Performance HVAC.

5. Building Automation System Requirements and Coordination: Each air-to-air energy recovery application shall include the means to effectively measure and verify performance and to troubleshoot the specific application.

   1. At a minimum there shall be appropriately selected sensors to accurately measure average air temperatures entering and immediately leaving each active portion of the energy recovery/transfer device. Where present, entering air temperature sensors already available to serve other functions may be used, such as building or campus outdoor air stations and common return/exhaust sensors.

   2. In special applications where total (sensible and latent) energy is recovered or transferred and total energy performance monitoring is required, include additional RH/enthalpy sensors. [Design Professional and BAS System Contractor shall review potential special applications with Mechanical and Energy Engineers in Engineering Services.]