Trouble-Free ERV

Trouble-Free ERVfor over 20 years!

Trouble-Free ERV

What is an Energy Recovery Ventilator (ERV)

An air-to-air heat exchanger that…

… recovers energy from both heat

and humidity.

Trouble-Free ERV

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.

Trouble-Free ERV

Flushes Out Contaminants

Conventional Ventilation

Dries Excess MoistureDispels OdorsCAN COST A LOT!

Trouble-Free ERV

What makes ERV the preferred choice for schools?

ERV makes the ventilation rates needed for moisture control and good IAQ

How?

affordable.

Trouble-Free ERV

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

Trouble-Free ERV

What makes ERV the preferred choice for schools?

Code requirements & mandates

Minnesota Washington

Ohio New Jersey

Next ?

Trouble-Free ERV

How Does ERV Work?

Trouble-Free ERV

ColdDry

WarmHumid

Heating Season

Conventional Ventilation

Trouble-Free ERV

ColdDry

WarmHumid

Heating SeasonEnergy Recovery Ventilation

ERVLess W

arm

Less Hum

id

Less Dry

Less Cold

Trouble-Free ERV

HotHumid

CoolDry

Cooling Season

Conventional Ventilation

Trouble-Free ERV

HotHumid

CoolDry

Cooling SeasonEnergy Recovery Ventilation

ERVLess Cool

Less Dry

Less Hot

Less Humid

Trouble-Free ERV

Diameter Seal

Blowers, Motors

Desiccant Material

Mechanical Wheel SystemsCircumference Seal

Trouble-Free ERV

Mechanical Wheel Systems

Outdoor Air Fresh Air Supply

Exhaust Air Room Air

PURGE AIR

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Trouble-Free ERV

RenewAire Static-Plate Technology

EV450 Blowers

Cross-flow Exchange Core

Trouble-Free ERV

Kuala Lumpur

Point Barrow

• Developed & Patented 1970’s

• First U.S. installations 1980

• Integrated in systems featuring prominent HVAC brands:

Trane

Carrier

York

McQuay

World-Wide Acceptance

Trouble-Free ERV

The Core is the Key!

Transfers heat by conduction.

Transfers humidity through vapor pressure differential.

Trouble-Free ERV

EXHAUST

FRESH AIR

Lower Humidity

Higher Humidity

H2O Migration

Hydroscopic Resin Medium

Trouble-Free ERV

EXHAUST

FRESH AIR

Higher Humidity

Lower Humidity

H2O Migration

Either Way =

No liquid waterNo freezing

Hydroscopic Resin Medium

Trouble-Free ERV

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

Fe Fe Fe Fe Fe Fe Fe Fe 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

Trouble-Free ERV

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

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

…for water vapor!

Hydroscopic Resin Medium

Trouble-Free ERV

Why is RenewAire preferred over wheel products?

Capital Savings

Operational Savings

Reliability

Design Flexibility

Trouble-Free ERV

Diameter Seal

Blowers, Motors

Desiccant Material

The Problem With Wheels

Circumference Seal

Air Leakage

High Maintenance

Reliability Issues

Trouble-Free ERV

Lost Air EffectsMicrometl ERV-AA Rated Airflow = 500CFM

Outdoor Air Fresh Air Supply

Exhaust Air Room Air

PURGE AIR (10 CFM )

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500 CFM

Wheel Cross Section

510 CFM

510 CFM

500 CFM

Pressure = -0.5 Exhaust Air Transfer = 9.9% OACF = 1.02

Trouble-Free ERV

Lost Air EffectsMicrometl ERV-AA Rated Airflow = 500CFM

Outdoor Air Fresh Air Supply

Exhaust Air Room Air

PURGE AIR (165 CFM )

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500 CFM

Wheel Cross Section

665 CFM

665 CFM

500 CFM

Pressure = 0.00 Exhaust Air Transfer = 0.2% OACF = 1.33

Trouble-Free ERV

Lost Air EffectsMicrometl ERV-AA Rated Airflow = 500CFM

Outdoor Air Fresh Air Supply

Exhaust Air Room Air

PURGE AIR (295 CFM )

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500 CFM

Wheel Cross Section

795 CFM

795 CFM

500 CFM

Pressure = +0.5 Exhaust Air Transfer = 0.0% OACF = 1.59

Trouble-Free ERV

“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%

Trouble-Free ERV

Lost Air EffectsRenewAire EV450 Rated Airflow = 450 CFM

Outdoor Air

Exhaust Air Fresh Air Supply

450 CFM459 CFM

459 CFM

Room Air

450 CFM

Pressure = 0.0 Exhaust Air Transfer = 0.0% OACF = 1.02

Trouble-Free ERV

Wheel Performance - A Delicate Balance

Low Efficiency

Low Cross Contamination High Efficiency

High Cross Contamination

Ventilation System Design

Low Efficiency

Low Cross Contamination High Efficiency

High Cross Contamination

Ventilation System Design

Trouble-Free ERV

Minimum Purge Air Losses = No Overbuilding of System

Low Cross ContaminationHigh Efficiency

Ventilation System Design

= Capital Savings

Trouble-Free ERV

Routine Wheel Maintenance

1. Remove wheel module2. Disassemble module3. Recondition exchange medium 4. Adjust/replace seals5. Adjust/replace belts or drive6. Reassemble module7. True wheel8. Replace module

Trouble-Free ERV

Wheel Maintenance Cost

2.5 hours – 8.5 hours

x $70/hour (Madison, WI)

$175 - $595

x 2/year

$350 - $1190 per wheel!

Trouble-Free ERV

Maintenance Downtime

Wheel stops: no energy recovery

Air-X-Change has recommended buying a replacement wheel with each unit to

switch out for maintenance

Trouble-Free ERV

Without Regular, Professional Service

System Failure :

100% outside air!

Trouble-Free ERV

RenewAire Maintenance

Trouble-Free ERV

vs. Laminar FlowTurbulent Flow

Straight Air Passages •Laminar Flow

Typical Velocity•200 - 500 ft./ min.

Static pressure loss•0.3 – 1.3 inch

RenewAire Technology

Trouble-Free ERV

Does the RenewAire core foul with particulate?

Particulate mats on the low velocity entering faces of the core.

Trouble-Free ERV

Air passages have no particulate accumulation

Trouble-Free ERV

After vacuum cleaning with soft brush – airflow is fully restored

Trouble-Free ERV

Easy Maintenance:

15 minutes @ janitorial staff hourly rate =

operational savings

Trouble-Free ERV

Reliability

Core Warranty

•No failure

•No degradation in performance

Trouble-Free ERV

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

Trouble-Free ERV

RenewAire Allows Cooling Equipment Downsizing

10 ton AC = 4000 CFM

25% OA = 1000 CFM

Load imposed by OA= Approx. 4 tons

Savings with RenewAire= Approx. 2.5 tons

Can provide same AC capacity with a 7.5 ton AC unit!!

Trouble-Free ERV

How can RenewAire be Applied?

Distributed air schematic

Rooftop

Tied to central air handler

Trouble-Free ERV

Twenty-seven EV450 Twenty-seven EV450 units above units above suspended ceilingsuspended ceiling

Yellow Medicine East High School, MN

Distributed Air Application

Trouble-Free ERV

Integrated ERV/Fan Coil

in School Classroom

(Available 277VAC option)

Trouble-Free ERV

HE2X900V with Packaged

Fan Coil

Trouble-Free ERV

Integrated ERV/VAV box

in School Classroom

(Available 277VAC option)

Trouble-Free ERV

Rooftop Application

Ballentine Elementary School

Irmo, South Carolina

Fourteen RTEC ERVs tied into Carrier and ICP roof top units

Trouble-Free ERV

End - connect or stand - alone

450 cfm – 8000 cfm

Rooftop Application

HE2X900RTV

Trouble-Free ERV

Applied Products Assembly of RenewAire cores in insulated cabinets

Centralized Systems

500 CFM to 50,000 + CFM

Trouble-Free ERV

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

EXHAUSTAIR

Cabinet - “C” Series - ERV Installed in Air Handling System

RenewAire

Trouble-Free ERV

Cabinet - “C” Series Installation

Trouble-Free ERV

What makes RenewAire your best choice for school projects?

Design flexibility

ARI Certified performance

0% exhaust air transfer

Lowest maintenance costBest warranty

Award-winning customer serviceAggressive pricing

Trouble-Free ERV

We’ll Show

You How.

Ready to Leave

the Wheels Behind?