maglev / turbocor compressor information for …...2013/12/18 · oil free centrifugal 72.0 dba...
TRANSCRIPT
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MagLev / Turbocor Compressor Information
for Multistack Chillers
from Paul W. Holland, P.E.
Principal / ConServ Energy Group, LLC
Authorized Dealers & Contractors for Multistack & MagLev
5123 Virginia Way / Suite C-21
Brentwood, Tennessee 37027
Phone: 615-221-9022
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Compressor Overview
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The MagLev Turbocor Compressor
• A 2 Stage Centrifugal Compressor which has Magnetic
Bearings and starts at 60 ton Capacity
• Designed To Provide Typical Full Load Performance and
Superior Part Load Performance
• Oil-Free, Very Quiet, and Vibration Free
• Small & Lightweight (only 20% weight of normal compressor)
• On Water Cooled Chillers, estimated 30% Energy Savings
• On Air Cooled Chillers or DX Systems, estimated 50%
Energy Savings
• Multiple MagLev Compressors on Multistack Chillers give
good system redundancy
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Magnetic Bearings & Oil Free
Refrigerant
Suction Port
Refrigerant
Discharge Port
(Back Side Of
Compressor)
Inlet
Guide
Vanes
First and
Second
Stage
Impellers
3 Phase AC
Power
Connection Softstart
And VFD
Motor-cooling
Solenoids
DC
Brushless
Motor
Control
Modules
(Modbus)
Electro-Magnetic
Bearings
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The Sinclair Building – Pasadena, CA
(Retrofit)
• 6,400 lbs was replaced with 265 lbs (and reduced power bill by more than 50%).
• R22 built up DX system
converted to R134a Before
After
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Screw Compressor Retrofit
Before After
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Centrifugal Compressor Retrofit
Before After
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Since no oil is used in
MagLev
Compressors
eliminates oil piping
complexity, additional
material/labor costs,
and potential joint
leaks associated with
oil return.
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0
0.2
0.4
0.6
0.8
1
20% 40% 60% 80% 100%
Percent Load
kW
/To
n
Frictionless Centrifugal W/C Screw W/C Recip
Independent data from McQuay International
Chiller Efficiency Comparison By Compressor Type
(Total chiller, not just compressor alone)
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Percent Oil
An ASHRAE study determined
that the vast majority of installed
chillers have an excess amount of
oil in the cooling system ASHRAE research study 601
3 ½% of oil in the
refrigerant charge
reduces system
efficiencies by 8 %
% E
ffic
ien
cy L
oss
Sam
ple
Nu
mb
er
The Effects of Oil in a System
Percent Oil
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Effect of Oil Overcharge from the
Ten Chillers Tested
• In the ten (10)
chillers tested in the
AHRAE study, the
average
overcharge of oil in
the system was
12.88%, this
equated to an
average energy
loss of about 21%.
Percent Oil
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Direct Drive Centrifugal With Magnetic
Bearings (in x, y, and z planes)
Magnetic bearings and sensors keep the shaft properly
centered and positioned at all times (shaft position is
monitored 100,000 / sec).
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Oil Free centrifugal
72.0 dBA
Sound Data
This is a copy of a Benchmark ad modified to include the centrifugal compressor sound
performance by comparison. Note that Recip and Scroll compressors are approximately 10 tons;
the Turbocor is 80 tons and still much quieter (dB scale is a logarithmic scale).
80 dBA +
Typical Screw
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TT300 Comparison
75 ton vs 75 ton
25 Tons Each
Conventional
Compressors
75 Ton
MagLev
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Efficient use of materials and labor-
Carrying the 265 pound compressor with a section of copper tubing that will be
used to re-pipe the compressor
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Emergency Generator Operation Benefits
• Only 1.6 amp inrush current at 480 volt with MagLev
• More standby generator capacity allowed due to very low
in-rush current
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For More Information and to Set Up A Meeting Please Contact
Paul W. Holland, P.E.
Principal / ConServ Energy Group, LLC
5123 Virginia Way / Suite C-21
Brentwood, Tennessee 37027
Phone: 615-221-9022