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Trouble-Free ERV

Trouble-Free ERV. for over 20 years!. What is an Energy Recovery Ventilator (ERV). An air-to-air heat exchanger that…. … recovers energy from both heat and humidity. What makes ERV the preferred choice for schools?.

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Trouble-Free ERV

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  1. Trouble-Free ERV for over 20 years!

  2. What is an Energy Recovery Ventilator (ERV) An air-to-air heat exchanger that… … recovers energy from both heat and humidity.

  3. What makes ERV the preferred choice for schools? Problems resulting from low ventilation rates have never been more evident. The demand for mechanical ventilation has never been greater.

  4. Conventional Ventilation • Flushes Out Contaminants $ • Dries Excess Moisture • Dispels Odors • CAN COST A LOT!

  5. What makes ERV the preferred choice for schools? ERV makes the ventilation rates needed for moisture control and good IAQ affordable. How?

  6. EPA “Tools for Schools” “ERV reduces the peak heating & cooling loads” “ERV systems can provide annual energy savings by reducing the amount of HVAC energy needed” “Allows capital reduction due to HVAC equipment downsizing” www.epa.gov/iaq

  7. What makes ERV the preferred choice for schools? Code requirements & mandates • Minnesota • Washington • Ohio • New Jersey Next?

  8. How Does ERV Work?

  9. Heating Season Conventional Ventilation Cold Dry Warm Humid

  10. Less Warm Less Humid Less Dry ERV Less Cold Heating Season Energy Recovery Ventilation Cold Dry Warm Humid

  11. Cooling Season Conventional Ventilation Hot Humid Cool Dry

  12. Less Cool Less Dry Less Hot ERV Less Humid Cooling Season Energy Recovery Ventilation Hot Humid Cool Dry

  13. Mechanical Wheel Systems Circumference Seal Desiccant Material Diameter Seal Blowers, Motors

  14. PURGE AIR Mechanical Wheel Systems Outdoor Air Fresh Air Supply Room Air Exhaust Air Media Rotation

  15. RenewAire Static-Plate Technology Cross-flow Exchange Core EV450 Blowers

  16. World-Wide Acceptance Kuala Lumpur • Integrated in systems featuring prominent HVAC brands: Point Barrow Trane Carrier York McQuay • Developed & Patented 1970’s • First U.S. installations 1980

  17. The Core is the Key! Transfers heat by conduction. Transfers humidity through vapor pressure differential.

  18. EXHAUST Lower Humidity Hydroscopic Resin Medium H2O Migration Higher Humidity FRESH AIR

  19. EXHAUST Higher Humidity H2O Migration Hydroscopic Resin Medium Either Way = Lower Humidity No liquid water No freezing FRESH AIR

  20. Think of a magnet… Zn Fe Zn Fe Fe Pb Fe Cu Cu Fe Pb Fe Fe Zn Fe Pb Pb Fe Cu Fe Fe Cu Fe Zn Zn Fe Pb Fe Fe Pb Fe Cu Cu Fe Zn Fe Fe Zn Fe Pb Cu Zn Pb Fe Zn Fe Zn Fe Fe Pb Fe Cu Cu Fe Pb FeFe Zn Fe Pb Pb Fe Cu FeFe Cu Fe Zn Zn Fe Pb Fe Fe Pb Fe Cu Cu Fe Zn Fe Fe Zn Fe Pb Cu Zn Pb Fe Fe Fe Fe Fe Fe Fe Fe Fe Fe

  21. …for water vapor! O2H2O N H2OH2O Co H2O Co N H2O Co2H2O NH3 N H2O N Co2H2O N H2O H2O N H2O N Co H2O N H2OH2O N H2O CoN H2O Co2H2O H2O O2H2O NH3 Co2 O2H2O N H2OH2O Co H2O Co N H2O Co2H2O NH3 N H2O N Co2H2O N H2O H2O N H2ON Co H2O N H2OH2O N H2OCoN H2O Co2H2OH2O O2H2ONH3 Co2 H2O H2O H2O H2O H2O H2O H2O H2O H2O Hydroscopic Resin Medium

  22. Why is RenewAire preferred over wheel products? Capital Savings Operational Savings Reliability Design Flexibility

  23. The Problem With Wheels Air Leakage Circumference Seal Desiccant Material High Maintenance Diameter Seal Reliability Issues Blowers, Motors

  24. PURGE AIR (10 CFM ) Lost Air EffectsMicrometl ERV-AA Rated Airflow = 500CFM Pressure = -0.5Exhaust Air Transfer = 9.9% OACF = 1.02 Wheel Cross Section Outdoor Air Fresh Air Supply 510 CFM 500 CFM Room Air Exhaust Air Media Rotation 510 CFM 500 CFM

  25. PURGE AIR (165 CFM ) Lost Air EffectsMicrometl ERV-AA Rated Airflow = 500CFM Pressure = 0.00 Exhaust Air Transfer = 0.2% OACF = 1.33 Wheel Cross Section Outdoor Air Fresh Air Supply 665 CFM 500 CFM Room Air Exhaust Air Media Rotation 665 CFM 500 CFM

  26. PURGE AIR (295 CFM ) Lost Air EffectsMicrometl ERV-AA Rated Airflow = 500CFM Pressure = +0.5 Exhaust Air Transfer = 0.0% OACF = 1.59 Wheel Cross Section Outdoor Air Fresh Air Supply 795 CFM 500 CFM Room Air Exhaust Air Media Rotation 795 CFM 500 CFM

  27. “Lost Air” is Significant in Wheels • Small wheels 15-30% and still some exhaust air transfer • Small wheels over 50% to achieve 0.0 exhaust air transfer • Large wheels typically 10-20%

  28. Fresh Air Supply 450 CFM Room Air 450 CFM Lost Air EffectsRenewAire EV450 Rated Airflow = 450 CFM Pressure = 0.0 Exhaust Air Transfer = 0.0% OACF = 1.02 Outdoor Air 459 CFM Exhaust Air 459 CFM

  29. High Cross Contamination Low Efficiency Ventilation System Design Low Cross Contamination High Efficiency Wheel Performance - A Delicate Balance High Cross Contamination Low Efficiency Ventilation System Design Low Cross Contamination High Efficiency

  30. Minimum Purge Air Losses = No Overbuilding of System Low Cross Contamination High Efficiency Ventilation System Design = Capital Savings

  31. Routine Wheel Maintenance 1. Remove wheel module 2. Disassemble module 3. Recondition exchange medium 4. Adjust/replace seals 5. Adjust/replace belts or drive 6. Reassemble module 7. True wheel 8. Replace module

  32. Wheel Maintenance Cost 2.5 hours – 8.5 hours x $70/hour (Madison, WI) $175 - $595 x 2/year $350 - $1190 per wheel!

  33. Maintenance Downtime • Wheel stops: no energy recovery • Air-X-Change has recommended buying a replacement wheel with each unit to switch out for maintenance

  34. Without Regular, Professional Service System Failure : 100% outside air!

  35. RenewAire Maintenance

  36. RenewAire Technology • Straight Air Passages • Laminar Flow • Typical Velocity • 200 - 500 ft./ min. • Static pressure loss • 0.3 – 1.3 inch Turbulent Flow vs. Laminar Flow

  37. Does the RenewAire core foul with particulate? Particulate mats on the low velocity entering faces of the core.

  38. Air passages have no particulate accumulation

  39. After vacuum cleaning with soft brush – airflow is fully restored

  40. Easy Maintenance: 15 minutes @ janitorial staff hourly rate = operational savings

  41. Reliability 10 YEAR Core Warranty • No failure • No degradation in performance

  42. RenewAire Allows Heating Equipment Downsizing (per 1000 cfm at 0º design condition) Load imposed by OA = 150,000 BTU/hour Load imposed by RenewAire = 56,000 BTU/hour Savings with RenewAire = 94,000 BTU/hour

  43. RenewAire Allows Cooling Equipment Downsizing

  44. How can RenewAire be Applied? Distributed air schematic Rooftop Tied to central air handler

  45. Distributed Air Application Twenty-seven EV450 units above suspended ceiling Yellow Medicine East High School, MN

  46. Integrated ERV/Fan Coil in School Classroom (Available 277VAC option)

  47. HE2X900V with Packaged Fan Coil

  48. Integrated ERV/VAV boxin School Classroom (Available 277VAC option)

  49. Rooftop Application Fourteen RTEC ERVs tied into Carrier and ICP roof top units Ballentine Elementary School Irmo, South Carolina

  50. Rooftop Application End - connect or stand - alone 450 cfm – 8000 cfm HE2X900RTV

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