Brett Graham
Habegger Corporation
Midwest Regional Sustainability Summit
May 1, 2015
Why Energy Recovery?
Cost Benefits
Performance Benefits
Downsize HVAC
equipment
Energy savings
Favorable payback
Rebates
Humidity Control
Decouple ventilation
Part load performance
Capture exhaust energy
2
RenewAire Core
Construction
Symmetrical
Fully adhered
Laminar airflow
Single material
0% cross contamination
Typical velocity 250 – 500 FPM
.6” SP loss typical
Not flammable!
RenewAire Core
71% 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

Simple vacuum procedure to core face to
clean blockage and change filters

However, laminar flow is maintained
through core passages

Do not wash core or remove from unit
ERV Certifications
AHRI 1060
Effectiveness
Purge air
Cross-contamination
Arbitrary airflow rating points
UL 1812
Flammability rating
ERV Selection Criteria
Ventilation and Exhaust Airflows
External Static Pressure
Design Conditions
Electrical
Control Strategy
EV / BR Series
70 to 450 CFM
Indoor applications
No condensate drain
Residential/lightcommercial
200 to 8000 CFM
Indoor & rooftop applications
No condensate drain
ECM & VFDs available
HE Series
8
LE Series
3,000 to 8,800 CFM
Indoor/Rooftop applications
Multiple cores parallel
Cost effective for larger airflows
500 to 40,000 CFM
Applied Series
Multiple cores parallel
No blowers/motors
CA/PA Series
9
DOAS RD Series
Energy recovery and tight
humidity control
100% OA requirements
DX / CW & HW
Indoor / Rooftop
Up to 4,400 CFM
Airflow Configurations
Exterior Rooftop
EA
EA
OA
OA
FA (R)
FA
Indoor Horizontal
11
RA
FA (V)
RA
Controls and Options
Controls
Digital time clock
Motion (occupancy) control
Carbon Dioxide control
Dehumidistat
Filter alarms
Standard Features
Transformer Relay Package
Non-fused disconnect
2” standard MERV-8 filters
Options
Double wall
Factory installed VFDs
OA / FA motorized dampers
Independent blower control
Standard white paint
Fused disconnect
2” MERV-13 filters
ERV Applications
New construction:
Preconditioning OA with ERV allows
for downsized HVAC equipment
New ERV technology is more reliable making downsizing more
viable
Oversized HVAC equipment is expensive and inefficient
Reduce HVAC equipment cost
Increase system efficiency
Payback on ERV cost <5 yrs
Annual energy savings
ERV Applications
Retrofits & Renovations:
Preconditioning OA with ERV can allow
existing HVAC equipment remain
unchanged
Increases in outdoor air load without
increasing the size of the equipment
ERV Benefits – Part Load
HVAC equipment sized for <1% of year
Ventilation is largest contributor
Oversized HVAC is inefficient, ineffective and
expensive
Can lead to short cycling/humidity issues
ERV can to reduce peak ventilation load
HVAC equipment to better serve the needs
INSIDE the space, not the outdoor conditions
ERV Benefits - Exhaust
ASHRAE Standard 62.1-2010, Section 5.16.3.2.5
Class 2 air shall not be transferred in to Class 1 spaces
Exception – 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% EATR
0% purge air
VRF System with ERV
VRF fan coil units have strict EAT ranges
Typical Cooling EAT Range
59°F WB
75°F WB
Typical Heating EAT Range
59°F DB
81°F DB
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!
VRF System with ERV
Typical Heating EAT Range
59°F DB
Without ERV: Unacceptable EAT
OA 300 CFM
5F DB
RA 700 CFM
70F DB
MA 1000 CFM
50.8F DB
With ERV: Acceptable EAT
OA 300 CFM
51.2F DB
RA 700 CFM
70F DB
MA 1000 CFM
64.4F DB
81°F DB
Rooftop ERV
19
Thank You!