Energy Recovery Ventilator
Model HRE
• Commercial • Institutional
• Summer Evaporative Cooling
• Winter Heat Recovery
February
2005
Features & Accessories
Model HRE
Heat Recovery Ventilator
with Evaporative Cooling
The model HRE incorporates a sensible energy
recovery wheel and evaporative cooling modules to
condition outdoor air without mechanical
refrigeration. This product is specifically designed for
hot, relatively arid climates. Four sizes provide airflow
capacities from 1,000 cfm to 8,300 cfm with external
static pressures up to 1.5 in. wg.
Evaporative Cooling Modules
Evaporative cooling modules include Munters
CELdek media (GLASdek optional) and a stainless
steel frame. Evaporative cooling media is 12 inches in
depth and capable of 90% cooling effectiveness.
A cooling module in the exhaust airstream for indirect
evaporative cooling is standard with the model HRE.
For combination indirect and
direct evaporative cooling, an
evap section may also be
added to the outdoor air
stream.
Indirect
Evaporative
Cooler
Direct Evaporative
Sensible
Wheel
Unit shown with following accessories: A) indirect gas
heater, B) intake filters, C) exhaust filters, and D) direct
evaporative cooling.
Cooler
Forward
Curved
Blowers
PostHeating
Optional features available
with evaporative cooling:
• Automatic drain and fill
with freeze protection
Sensible Wheel
Summer Cooling
The sensible wheel
transfers energy from the
cooled exhaust air to the
outdoor air
transferring the moisture
om the exhaust side
fr
evaporative cooling
process.
Winter Heating
The sensible wheel
transfers heat fr
outdoor air stream in typical energy recovery fashion.
, without
om the exhaust air str
eam to the
Heating Options
ect Gas-Fir
Indir
•
• Hot Water
• Electric
2
ed (outdoor only)
Standard Features
An indirect evaporative cooling module and
sensible energy recovery wheel provide a low cost
alternative for conditioning of outdoor air. Double
wall construction is standard keeping insulation
out of the airstream. Compartments requiring
routine maintenance have hinged doors for quick
and easy access.
Accessories
• Direct Evaporative Cooler
• Dampers - Internally mounted
• Painted Exteriors
• Roof Curbs
Timed Exhaust Frost Control
•
eheat Fr
Pr
•
eather Hoods
W
•
• Dirty Filter Sensors
• Rotation Sensors
• Filters
Economizer Mode
•
• Remote Panels
• Spare Wheel Segments
• Duct Flanges
• GFCI Receptacle (wiring by others)
• Service Lights (wiring by others)
ost Control
Psychrometric Process
20 30 40 50 60 70 80 90 100 110
30
40
50
60
70
140
120
100
80
60
40
20
Specific Humidity
Dry Bulb Temp.
Wet Bulb
Te
mp
.
50%
30%
10%
Outdoor
Air
Room Air
20 30 40 50 60 70 80 90 10
30
40
50
60
70
Dry Bulb Temp.
W
et
B
ulb
Te
m
p.
Room Air
Post Heat
100
Preheat
Required
Wheel Recovery
Outdoor Air
30
40
50
60
70
120
100
80
60
40
20
Specific Humidity
Dry Bulb Temp.
Wet Bulb Te
mp.
50%
30%
10%
Outdoor
Air
Room Air
Model HRE
The model HRE provides space
neutral ventilation air with indirect
evaporative cooling. More cooling
can be provided with the addition
of a dir
designs with space load
considerations. The sensible
wheel is utilized in the winter to
recover heat from the exhaust
airstream, minimizing energy
ect evaporative module for
1
Outdoor air enters HRE
2
Indirect Evap Cooler
3
Sensible Wheel
4
Direct Evap Cooler
5
Post Heat
1
2
4
3
costs.
Summer Psychrometric Process with Indirect Evap
1
Outdoor air enters HRE unit.
2
Leaving air condition of indirect evap cooler
3
Leaving outdoor air condition of indirect evap cooling process
A sensible wheel recovers energy from the evaporatively
cooled exhaust air and transfers it to the outdoor air.
Outdoor air entering at 100°F will leave this process at
about 73°F.
2
3
5
1
Summer Psychrometric Process with Indirect & Direct Evap
Outdoor air enters HRE unit.
1
Leaving air condition of indirect evap cooler
2
Leaving outdoor air condition of indirect evap cooling process
3
Leaving outdoor air condition of direct evap cooler
4
A sensible wheel r
ecovers energy fr
om the evaporatively cooled
exhaust air and transfers it to the outdoor air. Outdoor air
entering at 100°F will leave this process at about
73°F.
The direct evaporative cooler further
cools the outdoor air, and adds
moistur
e in this pr
ocess. Discharge
conditions are often around 55°F.
Winter Psychrometric Process
1
Outdoor air enters HRE unit (preheat required if outdoor air is between 0°F and 15°F).
3
Leaving air condition of sensible recovery process
5
Leaving air condition of post heating
The sensible recovery wheel heats winter outdoor air using energy
om the exhaust air str
fr
educed.
r
The heating option pr
supplemental heating to further treat
the outdoor air to desired supply
conditions.
eam. Heating bills ar
ovides
e significantly
1
2
4
3
3
5
1
3
Exhaust
Blower
Supply
Blower
Sensible
Wheel
Direct
Evap
Exhaust Side
Supply Side
B
A
C
Sensible Wheel
Supply Side
Exhaust Side
C
A
Indirect
Evaporative
Cooler
Direct
Evaporative
Cooler
Typical Specifications
Model A B C Max. CFM Weight* (lb)
HRE-20 98 50 56 2,000 1,500
HRE-45 106 69 66 4,100 2,300
HRE-55 118 70 76 5,600 3,000
HRE-90 131 85 96 8,300 5,000
Dimensions shown are in inches.
* Weights are approximate.
op V
T
Clearance on all sides for service access
(does not account for Indirect Gas heater):
HRE-20: 48 inches
HRE-45: 64 inches
HRE-55: 42 inches
HRE-90: 42 inches
iew
Our Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the
purchase date.The energy recovery wheel is warranted to be free from defects in ma terial and workmanship for a period of five
years from the purchase date.Any units or parts which prove defective during the warranty period will be replaced at our option
when returned to our factory,transportation prepaid. Motors are warranted by the motor manufacturer for a period of one year.
Should motors furnished by Greenheck prove defective during this period, they should be returned to the nearest authorized motor
service station. Greenheck will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reser ves the right to change specifications without notice.
Greenheck P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck.com
Copyright © 2005 Greenheck Fan Corp. • Catalog HRE RG Rev. 2 February 2005
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