Greenheck Fan ERV Ventilation Hood User Manual


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3
Certifications
ERV’s construction is matched with extensive in-house testing and third-party verification of
performanceandsafety.
How does an energy recovery wheel work?
The basic objectives for providing acceptable indoor air quality (IAQ) are to
control indoor contaminates levels while maintaining desired indoor air
temperature and humidity. Compliance with the prescribed ventilation rates
in ASHRAE Standard 62 appear to satisfy the contaminant issue. However,
simply increasing outdoor air (OA) requirements with “traditional” HVAC
systems may not address the humidity issue properly and often leads to
significant energy cost increases.
The best solution for most commercial and institutional facilities
will include an enthalpy wheel product. The enthalpy wheel
transfers temperature and moisture properties from one
airstream to another. The result is capturing the cooling and
heating energy before it leaves the HVACsystem.
Moving through the unit, the return and supply airstreams
pass on opposite sides of a divider panel. The
enthalpy wheel rotates between the airstreams
transferring up to 75% of the energy
present in the exhaust airstream to
the supply.
Utilizing an enthalpy wheel to precondition the outdoor air,
narrows the operational range of outdoor air conditions
which the building’s HVAC equipment is designed to
temper. It is this reduction in the outdoor air range that
allows for size reduction in heating and cooling equipment
and reduced energy costs.
-10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
50
55
0
5
10
15
20
25
30
35
40
45
ENTHALPY - BTU PER POUND OF DRY AIR
0
10
20
25
30
35
40
45
50
55
60
65
70
75
80
0.350.300.250.20
SENSIBLE HEAT RATIO = Qs / Qt
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
15%
25%
2%
4%
6%
8% RELATIVE HUMIDITY
10% RELATIVE HUMIDITY
20%
30%
40%
50%
60%
70%
80%
90%
-5
0
0
5
5
10
10
15
15
20
20
25
25
30
30
35
35
40
40
45
45
50
50
55
55
60
60
65
65
70
70
75
75
80 WET BULB TEMPERATURE - °F
80
85
12.0
13.0
14.0 VOLUME- CU.FT. PER LB. DRY AIR
15.0
HUMIDITY RATIO - GRAINS OF MOISTURE PER POUND OF DRY AIR
Wet Bulb, Saturation Temp - °F
-10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
DRY BULB TEMPERATURE - °F
0
5
10
15
20
25
30
35
40
45
50
50
55
55
ENTHALPY - BTU PER POUND OF DRY AIR
0
5
10
15
20
25
30
35
40
45
ENTHALPY - BTU PER POUND OF DRY AIR
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
VAPOR PRESSURE - INCHES OF MERCURY
0
10
20
25
30
35
40
45
50
55
60
65
70
75
80
DEW POINT TEMPERATURE - °F
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.400.350.300.250.20
SENSIBLE HEAT RATIO = Qs / Qt
SENSIBLE HEAT RATIO = Qs / Qt
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
15%
25%
2%
4%
6%
8% RELATIVE HUMIDITY
10% RELATIVE HUMIDITY
20%
30%
40%
50%
60%
70%
80%
90%
-5
0
0
5
5
10
10
15
20
25
30
35
40
45
50
50
55
55
60
60
65
65
70
70
75
75
80 WET BULB TEMPERATURE - °F
80
85
12.0
13.0
14.0 VOLUME- CU.FT. PER LB. DRY AIR
15.0
HUMIDITY RATIO - GRAINS OF MOISTURE PER POUND OF DRY AIR
Wet Bulb, Saturation Temp - °F
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
15
20
25
30
35
40
45
Exhaust Blower
Supply
Blower
Exhaust Weatherhood
Outdoor Air Weatherhood
Enthalpy Wheel
Return Air From Building
Supply Air to Building
Filters
Filters
Exhaust Air
Outdoor Air
Licensed to bear the AMCA seal for
AirPerformance
Greenheck certifies that the ERV models shown herein are licensed
to bear the AMCA seal. The ratings shown are based on tests and
procedures performed in accordance with AMCA Publication 211 and
comply with the requirements of the AMCA Certified RatingsProgram.
Unit is ETL Listed — all internal electrical
components are factory wired to a single-point
power connection
Every unit is tested at the factory before it is shipped to the job site.
ARI Standard 1060 certified energy wheel
performance assures the ERV model will function
as required in demandingenvironments
Energy recovery wheels are certified by the ARI Air-to-Air Energy
Recovery Ventilation Equipment Certification Program in accordance
with ARI Standard 1060. Actual performance in packaged equipment
may vary. Certified ratings are available in the Certified Product
Directory at http://www.ahridirectory.org/ahridirectory/pages/home.
aspx
Model ERV
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