MSU chilled water - Michigan State University
Big Ten and Friends Utility Conference – 2015 Michigan State University Chilled Water Stacy Nurenberg – IPF Maintenance Engineer Bill Lakos – IPF Energy Analyst Big Ten and Friends Utility Conference – 2015 50000 45000 40000 35000 30000 Water Cooled Thru Wall A/C Absorption Electric 25000 20000 15000 10000 5000 0 1980 1985 1990 1995 2000 2005 2013 2015 Big Ten and Friends Utility Conference – 2015 Campus chilled water – summary • • • • Electric cooling – 14,391 tons cap. Absorption cooling – 31,030 tons cap. (36 units) Through-the-wall/window a/c – 1,947 tons cap. Water cooled – 22 tons cap. • Total – 47,390 tons covering 11M sqft Big Ten and Friends Utility Conference – 2015 Regional Chilled Water Plant Capacity = 12,900 tons @ 14°∆T Big Ten and Friends Utility Conference – 2015 Regional Chilled Water Plant • History • 1971 – Bay 1 constructed • 1976, 1985, 1989, 1991, 1997 – expansions • 2004 – Chillers 1 and 2 replaced • 2007 – Chillers 3 through 6 replaced • Capacity – 12,900 tons • Six – 1,250 tons • Four – 1,350 tons • Load - 12,300 tons • 20 tertiary pumping systems • 17 buildings • 129 coils – 10 to 20°∆T Big Ten and Friends Utility Conference – 2015 Big Ten and Friends Utility Conference – 2015 Regional Chilled Water Plant • Deficiencies • Low/variable Delta-T • Chiller staging (2200+ GPM increments) • Future growth limitations • Opportunities under investigation • Delta-T optimization • Pumping elimination/reduction • Differential pressure reset • Chiller staging optimization (flow vs. temperature) • Decoupler location • Future • Growth • Absorption vs. steam turbine vs. electric centrifugal • 2 chillers currently 22-years old Big Ten and Friends Utility Conference – 2015 MSU, chilled water and the future • Absorption? • Steam turbine? • Electric? Big Ten and Friends Utility Conference – 2015 Integrated Energy Planning Model (IEPM) Big Ten and Friends Utility Conference – 2015 IEPM – campus perspectives Big Ten and Friends Utility Conference – 2015 IEPM – campus perspectives Big Ten and Friends Utility Conference – 2015 IEPM – campus perspectives Big Ten and Friends Utility Conference – 2015 IEPM - centers of knowledge and expertise Big Ten and Friends Utility Conference – 2015 IEPM - centers of knowledge and expertise combined Big Ten and Friends Utility Conference – 2015 IEPM – shared insight Big Ten and Friends Utility Conference – 2015 Big Ten and Friends Utility Conference – 2015 IEPM flexibility Big Ten and Friends Utility Conference – 2015 IEPM power to analyze diverse scenarios Big Ten and Friends Utility Conference – 2015 IEPM – compare chiller scenarios Big Ten and Friends Utility Conference – 2015 IEPM – compare chiller scenarios Big Ten and Friends Utility Conference – 2015 IEPM – compare chiller scenarios Big Ten and Friends Utility Conference – 2015 IEPM – compare chiller scenarios Big Ten and Friends Utility Conference – 2015 IEPM – compare chiller scenarios Big Ten and Friends Utility Conference – 2015 IEPM – compare chiller scenarios Big Ten and Friends Utility Conference – 2015 Conclusions? • • • • All scenarios have positive aspects All scenarios have negative aspects All solutions could be considered Each decision requires a case by case analysis Big Ten and Friends Utility Conference – 2015 Engineering Building Big Ten and Friends Utility Conference – 2015 Engineering Building • Existing: 2 – 600 ton absorbers • End of its useful service life • Project goals: • Implement a comprehensive, long-range plan to create a regional chilled-water loop among six buildings: • • • • • • • • • • Engineering Building Anthony Hall Food Science Natural Resources Packaging Communication Arts and Sciences Highest tons per square foot of machine footprint Increase efficiency Allow for expansion of building (location of chillers) Life cycle cost analysis Big Ten and Friends Utility Conference – 2015 Utility site plan and extents of construction Big Ten and Friends Utility Conference – 2015 Engineering Building: three chiller options evaluated: • 2 – 800 ton single-stage absorption • 2 – 1200 ton steam turbine • 2 – 1200 ton electric centrifugal Big Ten and Friends Utility Conference – 2015 Big Ten and Friends Utility Conference – 2015 Engineering Building Validation • Metering energy in o Steam meters o Electric meters (on VFDs and chillers) • Metering energy out o BTU meters Generated output of each chiller Consumption of each building secondary system Big Ten and Friends Utility Conference – 2015 QUESTIONS? Stacy Nurenberg IPF Maintenance Engineer [email protected] (517) 432-0531 Bill Lakos IPF Energy Analyst [email protected] (517) 432-0530
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