HomeMy WebLinkAbout05. Laboratory HVAC Upgrade and Repair, DP 7319 PowerPoint4/1/2016
LABORATORY HVAC UPGRADE AND
REPAIR PROJECT, DP 7319
Craig Mizutani, P.E.
E&O Committee
Monday April 4, 2016
LAB BUILDING
EXISTING CHILLER AND ROOF CURB
EXISTING CHILLER HISTORY
• 150 -ton Chiller approximately 14 years old
• Original manufacturer bought out by new company
• Support, service, and parts are difficult to replace or obsolete
• Historical problems and increased maintenance
• Frequent (Daily during summer) trip/reset required to run
• Replaced compressor in 2011, significant impacts & costs
• Second compressor failure last summer and repair
was not recommended, no warranty included.
• Remaining components worn and require
repair/replacement
ZAL
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RENTAL CHILLER
$9,500 installation and delivery (Aug. 2015)
$9,700 per month rental
CAUSE OF FAILURES
Due to high range of cooling demands, the
system frequently starts/stops which
lowers the equipment life.
The existing chiller was lower quality and
not very robust.
Ilk Controls design needs improvements.
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RECOMMENDED PROJECT
Chiller replacement
Install new unit, approximately 20% more
energy efficient
Chiller upgrades include VFD, isolation
transformer, better heat transfer, HFC -134A
refrigerant
Piping, electrical, coatings, and control
modifications
PROJECT ALSO INCLUDES
Structural Modifications:
Existing structural steel does not transfer
seismic forces to columns
New chiller is 4,300 pounds heavier
Added steel for increased weight and seismic
forces
Meets new seismic design criteria
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PROJECT ALSO INCLUDES
Retrofitting Existing Air Handling Unit
Remove existing inlet guide vanes and two
speed motor ( 60 HP)
Install new Variable Frequency Drive and
paired premium efficiency motor
Increased energy efficiency and volume/ building
static pressure control
OTHER IMPROVEMENTS
Control system modifications
Full building air and water balance
last completed in 2001
Exhaust fan modifications for new Lab
process chemicals requiring higher fume
hood face velocities
• PGE Rebates up to $10k
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BUSINESS CASE ANALYSIS
Alternative 1 —
Repair Existin
Chiller
Iternative 2 —
eplace with in-kind
ommercial Chiller
Alternative 3 —
Replace with
Industrial Chiller
Net Present Value 1$3,074,000
$2,819,000
1$2,418,000
Assumptions:
1. Discount Rate 4%
2. O&M Inflation Rate 2.6%
3. Capital Cost Inflation Rate 2.5%
4. Lifecycle period 20 years
t
• Recommend Alternative 3
Lowest Net Present Value
• Highest Energy Efficiency
• Meets Current Seismic Code & Other Benefits
STAFF RECOMMENDATION
Award a construction
contract in the amount
of $696,665 for the
construction of the
Laboratory HVAC
Upgrades to Integra
Construction
Services, Inc.
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QUESTIONS