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Core Technology: Heat ExchangersMike Herwald
Regional Sales ManagerOctober 11, 2016
mike.herwald@munters.com
1
Copyright 2015 Munters Corporation
2
•Wheel Heat Exchangers
–Enthalpy
–Sensible
•Plate Heat Exchangers
–Counter-flow
–Cross-flow
•Heat Pipe Heat Exchangers
•Polymer Tubular Exchangers (EPX)
Air-to-Air Heat Exchangers
Copyright 2015 Munters Corporation
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3 or 4 Angstrom
Molecular Sieve
Rotary Wheel Heat Exchangers
Aluminum Matrix Rotary Exchanger
Copyright 2015 Munters Corporation
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Water vapor in supply air stream is
adsorbed on the desiccant
Because the vapor pressure in the colder exhaust air stream is lower than the water vapor pressure on the desiccant surface, the water is desorbed and exhausted back to the outside
Molecular sieve is a man made material with controlled pore openings to adsorb only certain type of vapors and gases.
4A pore opening
Molecular Sieve: How Does It Work?
Copyright 2015 Munters Corporation
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The Total Energy Recovery Wheel Benefit
Control Point
Conditions Leaving Wheel
55°F DewPoint
75°F Temperature
Outside Weather Variations
Total energy recovery significantly reduces the variations in operating conditions.
Copyright 2015 Munters Corporation
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Purge Minimizes Carryover
A portion of the outside air stream is used to flush out
the contaminated return air still contained in the flutes of the wheel.
Supply Air
Outside Air
Purge angleis dependent on
face velocity
Exhaust Air
Copyright 2015 Munters Corporation
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Plate Heat Exchangers - Counter-Flow Heat Exchanger
• The counter-flow heat exchanger provides
the maximum potential for energy transfer.
• Two 2-gas streams flow counter current to
one another facilitating a temperature
difference for the entire length of its flow
path. The longer the flow length in this
design the more effective the heat
exchanger becomes.
• Munters can achieve up to 85% effective
heat transfer with the counter flow design.
HOT GAS OUT
COLD GAS
IN
COLD GAS
OUT
HOT GAS
IN
Copyright 2015 Munters Corporation
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Counter-flow Plate
• Continuous- fold
• 60-85% effective
• Many Airflow Configurations
O/A
S/A
R/A
E/A
U-Flow
K-Flow L-Flow
X-Flow
Copyright 2015 Munters Corporation
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Cross-Flow Heat Exchanger
• In practice, the cold air flows in a cross-
flow direction to the exhaust or hot flow.
Because the air streams move in
transverse 90° directions, the heat
exchanger is termed cross-flow. COLD GAS
IN
COLD GAS
OUT
HOT GAS
IN
HOT GAS OUT
Copyright 2015 Munters Corporation
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Cross-flow Sensible Plate
• Cross-flow has individual plates separated
by embossed dimples
Copyright 2015 Munters Corporation
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Counter flow Plate Heat Exchanger - 75% eff. sensible heat recovery
Copyright 2015 Munters Corporation
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2/12/2002
30.9 36.4 43.2 51.4
24.2 28.9 35.3 43.8
17.1 20.4 25.6 33.3
9 10.9 13.8 18.9
0/50% 0/50% 0/50% 0/50%
72/30%64.456.649.142.4
72/30%61.651.943.436.6 SAT
72/30%57.745.936.8 SAT32.3 SAT
72/30%51.237.531.2 SAT25.7 SAT
OUTSIDE AIR OUTLET (SUPPLY)
OUTSIDE AIR INLET
RE
TU
RN
AIR
IN
LET
EX
HA
US
T A
IR O
UT
LET
CROSS FLOW HEAT EXCHANGER STUDY
"COLD CORNER"
34°F
Copyright 2015 Munters Corporation
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2/12/2002
30.9 36.4 43.2 51.4
24.2 28.9 35.3 43.8
17.1 20.4 25.6 33.3
9 10.9 13.8 18.9
0/50% 0/50% 0/50% 0/50%
72/30%64.456.649.142.4
72/30%61.651.943.436.6 SAT
72/30%57.745.936.8 SAT32.3 SAT
72/30%51.237.531.2 SAT25.7 SAT
OUTSIDE AIR OUTLET (SUPPLY)
OUTSIDE AIR INLET
RETU
RN A
IR IN
LET
EXHA
UST
AIR
OUT
LET
CROSS FLOW HEAT EXCHANGER STUDY
"COLD CORNER"
1. Bypass
2. Coldest Air on Coldest Day
Copyright 2015 Munters Corporation
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Counterflow HX
O/A
S/A E/A
0°F
70°F
24°F 50°F
What about Frost?
Copyright 2015 Munters Corporation
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Traversing Defrost Prevents Ice
WORM GEAR DRIVE ROD
TRAVERSING PLATE (~5in/min)
DRIVE MOTOR
END VIEW
SA/OA VIEW
SA RA
OA EA
TRAVERSING PLATE BLOCKS COLD OA PASSAGES ALLOWING WARM RA TO
MELT ANY FROST BUILD-UP
Copyright 2015 Munters Corporation
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• Gives MAX use of Heat
Exchanger in winter
Traversing Defrost
Copyright 2015 Munters Corporation
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Heat Pipe Heat Exchanger
HOT
COLD
Refrigerant
Liquid evaporates this end
Vapor condenses this end
55% eff in Summer and Winter
Copyright 2015 Munters Corporation
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• Each Heat Pipe has a Mechanical Fitting
Allowing for Retrofit with Future
Refrigerant Enhancements
Copyright 2015 Munters Corporation
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When there is no return air to recover building energy, Wringer can use wrap-around heat pipe,
straight heat pipe, or plate heat exchanger.
HX 1 HX 2 95/78
73/72 50/50 72/59
Copyright 2015 Munters Corporation
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Heat Exchanger Comparison
PLATE HEAT PIPE WHEELNOMINAL SENSIBLE EFFECTIVENESS 68% 58% 75%NOMINAL LATENT EFFECTIVENESS 0% 0% 75%
MOVING PARTS NO NO YESMAINTENANCE REQUIREMENTS MINIMAL MINIMAL HIGHPARTICULATE PASSAGE EXCELLENT GOOD NOT GOOD
LEAKAGE NONE NONE 5% - 20%
CLEANABILITY EXCELLENT GOOD NOT GOOD
SIZE LARGE COMPACT VERY COMPACT
LIFE EXPECTANCY 25 YRS + 25 YRS + 10 YRS +
COSTAbout same as heat pipe / wheel
About same as plate / wheel
About same as plate / heat pipe
Copyright 2015 Munters Corporation
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