Brett Graham Habegger Corporation

Midwest Regional Sustainability SummitMay 1, 2015

2

Why Energy Recovery?Cost Benefits

Downsize HVAC equipmentEnergy savingsFavorable paybackRebates

Performance BenefitsHumidity ControlDecouple ventilationPart load performanceCapture exhaust energy

RenewAire CoreConstruction

SymmetricalFully adheredLaminar airflowSingle material

0% cross contamination

Typical velocity 250 – 500 FPM

.6” SP loss typical

Not flammable!

RenewAire Core71% sensible effectiveness

43% - 50% Summer Latent Effectiveness

52% - 59% Winter Latent Effectiveness

53% - 69% Total Effectiveness

Simple, Easy Maintenance Particulate face loading clogs core face

when core is not maintained

However, laminar flow is maintained through core passages

Simple vacuum procedure to core face to clean blockage and change filters

Do not wash core or remove from unit

ERV CertificationsAHRI 1060

EffectivenessPurge airCross-contaminationArbitrary airflow rating points

UL 1812Flammability rating

ERV Selection CriteriaVentilation and Exhaust AirflowsExternal Static Pressure Design ConditionsElectrical Control Strategy

8

EV / BR Series

HE Series

200 to 8000 CFMIndoor & rooftop applicationsNo condensate drainECM & VFDs available

70 to 450 CFMIndoor applicationsNo condensate drainResidential/light-commercial

9

LE Series

CA/PA Series

3,000 to 8,800 CFMIndoor/Rooftop applicationsMultiple cores parallelCost effective for larger airflows

500 to 40,000 CFMApplied SeriesMultiple cores parallelNo blowers/motors

DOAS RD SeriesEnergy recovery and tight humidity control

100% OA requirements

DX / CW & HW

Indoor / Rooftop

Up to 4,400 CFM

11

OAEA

RA

FA (R)

FA (V

)

Airflow Configurations

EA

FA

OA

RA

Indoor Horizontal

Exterior Rooftop

Controls and OptionsControls

Digital time clockMotion (occupancy) controlCarbon Dioxide controlDehumidistatFilter alarms

Standard FeaturesTransformer Relay PackageNon-fused disconnect2” standard MERV-8 filters

OptionsDouble wallFactory installed VFDsOA / FA motorized dampersIndependent blower controlStandard white paintFused disconnect2” MERV-13 filters

ERV ApplicationsNew construction:

Preconditioning OA with ERV allows for downsized HVAC equipment

New ERV technology is more reliable making downsizing more viableOversized HVAC equipment is expensive and inefficientReduce HVAC equipment costIncrease system efficiencyPayback on ERV cost <5 yrsAnnual energy savings

ERV Applications

Retrofits & Renovations: Preconditioning OA with ERV can allow existing HVAC equipment remain unchangedIncreases in outdoor air load without increasing the size of the equipment

ERV Benefits – Part LoadHVAC equipment sized for <1% of year

Ventilation is largest contributorOversized HVAC is inefficient, ineffective and expensiveCan lead to short cycling/humidity issues

ERV can to reduce peak ventilation loadHVAC equipment to better serve the needs INSIDE the space, not the outdoor conditions

ERV Benefits - Exhaust

ASHRAE Standard 62.1-2010, Section 5.16.3.2.5Class 2 air shall not be transferred in to Class 1 spacesException – When using an energy recovery device, recirculation from leakage (EATR), carryover or transfer (Purge air) from the exhaust side of the energy recovery device is permitted

Not to exceed 10%

Use RenewAire’s AHRI 1060 rated static plate core with no recirculation through the core for defrost

0% EATR0% purge air

VRF System with ERVVRF fan coil units have strict EAT ranges

Bringing in too much untreated outside air may cause the mixed EAT to be outside the acceptable range

Using a zoned or central ERV can bring EAT to an acceptable temperature without needing a full DOAS system!

Typical Heating EAT Range

59°F DB 81°F DB

Typical Cooling EAT Range

59°F WB 75°F WB

OA 300 CFM5F DB

RA 700 CFM70F DB

MA 1000 CFM50.8F DB

Without ERV: Unacceptable EAT

With ERV: Acceptable EAT

OA 300 CFM51.2F DB

RA 700 CFM70F DB

MA 1000 CFM

64.4F DB

VRF System with ERVTypical Heating EAT Range

59°F DB 81°F DB

19

Rooftop ERV

Thank You!