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Published byLawrence Randall Modified over 9 years ago
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November 2004 Low Hanging Fruit Low Cost Energy Efficiency Opportunities in Cleanrooms
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Free Cooling
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Psychrometric Chart for San Jose 3,200 Hours Minimum
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Free Cooling Configuration #2 - Series PCW Only
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An Innovative Layout Possibility Dual Temperature Chilled Water Plant
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Pumping Problems
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Current Primary - Secondary Pumping
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VFD Chillers
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Lower Chiller Condenser Water Temperatures
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Use Variable Speed Drives n Good for fans, even better for pumps, which are typically controlled and balanced by throttling
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Remove Booster Pumps and close bypasses
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Close 3-way Valves n B8 has a highly variable load due to air washer capacity, yet a constant flow
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Aim for Highest Possible CHW Delta T
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Exhaust Optimization Exhaust Reduction Amount Annual Electricity Savings (kWh) Annual Gas Savings (Therms) Annual Energy Cost Savings ($) 5,000 cfm223,40024,350$20,800 10,000 cfm440,00048,700$41,200 20,000 cfm854,00097,400$81,300 n Tool exhaust can be optimized via tracer gas or other accepted test methods n In most cases tool exhaust can be reduced 10 – 50% n Fume containment testing required for optimization also verifies worker safety n Case Study Savings Opportunity:
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When replacing broken or worn out equipment Select the most efficient option n Efficiency often has little relationship to cost of equipment n E.G. ----- n Pumps n Electric Motors n Fans n etc.
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Variable Speed Drive Compressors and waste heat regen dryers n VSD Compressors address the cycling problem
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Commissioning / Retrocommissioning n Retrocommission - on a regular basis commission key components of system n E.G. - Develop standard tests for key control loops
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Effect - Supply Air Temperature is Deficient Design Supply Air Temp is 55 deg F with no SAT reset
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Cause Chilled Water Temperatures
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Commission to avoid cycling
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Control Optimization
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THANK YOU! Rumsey Engineers, Inc. 99 Linden Street Oakland, CA 94607 (510) 663-2070 www.RumseyEngineers.com prumsey@RumseyEngineers.com
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