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Brett Graham Habegger Corporation
Midwest Regional Sustainability SummitMay 1, 2015
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Why Energy Recovery?Cost Benefits
Downsize HVAC equipmentEnergy savingsFavorable paybackRebates
Performance BenefitsHumidity ControlDecouple ventilationPart load performanceCapture exhaust energy
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RenewAire CoreConstruction
SymmetricalFully adheredLaminar airflowSingle material
0% cross contamination
Typical velocity 250 – 500 FPM
.6” SP loss typical
Not flammable!
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RenewAire Core71% sensible effectiveness
43% - 50% Summer Latent Effectiveness
52% - 59% Winter Latent Effectiveness
53% - 69% Total Effectiveness
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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
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ERV CertificationsAHRI 1060
EffectivenessPurge airCross-contaminationArbitrary airflow rating points
UL 1812Flammability rating
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ERV Selection CriteriaVentilation and Exhaust AirflowsExternal Static Pressure Design ConditionsElectrical Control Strategy
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EV / BR Series
HE Series
200 to 8000 CFMIndoor & rooftop applicationsNo condensate drainECM & VFDs available
70 to 450 CFMIndoor applicationsNo condensate drainResidential/light-commercial
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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
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DOAS RD SeriesEnergy recovery and tight humidity control
100% OA requirements
DX / CW & HW
Indoor / Rooftop
Up to 4,400 CFM
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OAEA
RA
FA (R)
FA (V
)
Airflow Configurations
EA
FA
OA
RA
Indoor Horizontal
Exterior Rooftop
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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
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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
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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
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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
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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
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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
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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
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Rooftop ERV
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Thank You!