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”

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

8. How Does ERV Work?

9. Conventional Ventilation
Heating Season
Conventional Ventilation
Cold
Dry
Warm
Humid

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

11. Conventional Ventilation
Cooling Season
Conventional Ventilation
Hot
Humid
Cool
Dry

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

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

14. Mechanical Wheel Systems
Outdoor Air
Fresh Air Supply
PURGE AIR
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 FRESH AIR H2O Migration Lower Humidity
Hydroscopic Resin Medium
H2O Migration
Higher Humidity
FRESH AIR

19. EXHAUST FRESH AIR H2O Migration Either Way = No liquid water
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 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
Fe Fe Fe Fe Fe Fe Fe Fe Fe

21. …for water vapor! Hydroscopic Resin Medium
O2 H2O N H2O H2O Co H2O Co N H2O Co2 H2O NH3 N H2O N Co2 H2O N H2O H2O N H2O N Co H2O N H2O H2O N H2O Co N H2O Co2 H2O H2O O2 H2O NH3 Co2
O2 H2O N H2O H2O Co H2O Co N H2O Co2 H2O NH3 N H2O N Co2 H2O N H2O H2O N H2O N Co H2O N H2O H2O N H2O Co N H2O Co2 H2O H2O O2 H2O NH3 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. Lost Air Effects Micrometl ERV-AA Rated Airflow = 500CFM
Pressure = Exhaust Air Transfer = 9.9% OACF = 1.02
Wheel Cross Section
Outdoor Air
Fresh Air Supply
510 CFM
500 CFM
PURGE AIR (10 CFM )
Room Air
Exhaust Air
Media Rotation
510 CFM
500 CFM

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

26. Lost Air Effects Micrometl ERV-AA Rated Airflow = 500CFM
Pressure = Exhaust Air Transfer = 0.0% OACF = 1.59
Wheel Cross Section
Outdoor Air
Fresh Air Supply
795 CFM
500 CFM
PURGE AIR (295 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. Lost Air Effects RenewAire EV450 Rated Airflow = 450 CFM
Pressure = Exhaust Air Transfer = 0.0% OACF = 1.02
Room Air
450 CFM
Outdoor Air
459 CFM
Exhaust Air
Fresh Air Supply
450 CFM
459 CFM

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

30. Minimum Purge Air Losses = No Overbuilding of System
High Efficiency
Low Cross Contamination
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. Wheel stops: no energy recovery
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
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. 15 minutes @ janitorial staff hourly rate =
Easy Maintenance:
15 janitorial staff hourly rate =
operational savings

41. Core Warranty Reliability 10 YEAR 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 box in 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

51. Centralized Systems Applied Products 500 CFM to 50,000 + CFM
Assembly of RenewAire cores in insulated cabinets
500 CFM to 50,000 + CFM

52. Cabinet - “C” Series - ERV Installed in Air Handling System
RenewAire
Manifold Stack -(3)- C3000 Units
RETURN AIR
(from space)
SUPPLY AIR
(to space)
Packaged Air
Conditioning Unit
Fresh Air Blower
Service Area
Exhaust Air Blower
OUTSIDE AIR
EXHAUST
AIR

53. Cabinet - “C” Series Installation

54. What makes RenewAire your best choice for school projects?
Design flexibility
ARI Certified performance
0% exhaust air transfer
Lowest maintenance cost
Best warranty
Award-winning customer service
Aggressive pricing

55. Ready to Leave the Wheels Behind?
We’ll Show You How.