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• Summary and Conclusions o Enormous benefits from SWAC o SWAC long used with harbor water (in Halifax, Nova Scotia and in Sweden) o Deep Lake Source DC, using Hawaiian technology (at Cornell U. and Toronto) o Unique potential in Hawaii – deep water access, over 100,000 ton potential, and mitigation of imported oil risks o TES a natural complement to SWAC, especially using CHW TES o Prelim results show 10 to15% improved economics with TES, and thus improved chances to realize commercialization • Recommendations o Identify and address all significant barriers – to DC in general, to SWAC specifically, to Hawaii in particular, and specific to individual developments and customers. o Incorporate TES in SWAC designs to improve economics o Market the benefits of SWAC to all stakeholders The benefits are much too great – not to persevere and turn the vision into a reality. Overview of a Successful Public-Private Partnership District Energy Development Anders Rydaker, President – District Energy St. Paul Mr. Rydaker presented a brief overview of the District Energy development serving St. Paul, MN. (Additional detail can be found at the DESP website: http://www.districtenergy.com.) • The DESP system was started with strong support from the then mayor. • DESP was initially started as a DH system, using hot water distribution (on the European model). • Later, DC service was added. The DC system has grown steadily from its start over the last 10 years, now serving 60 to 65 DC customers (~20,000 tons). Customers are both public and private facilities representing a 60 to 65% market share in the St. Paul CBD and government (State Capitol) district. • The central plant has HW boilers (firing coal, oil, gas, and wood waste) and chillers (electric centrifugals and some absorption), plus a 2.5 million gallon chilled water TES tank. • A new satellite chiller plant is on-line this spring with an additional 6,000 tons of electric centrifugal chillers and a 4 million gallon chilled water TES tank. • Existing chillers at a few select customer buildings are contractually controlled by DESP for use as peaking and back-up chiller capacity (though rarely if ever operated). • The most distant customers are 25 city blocks of piping distance from the main chilled water plant. • The DESP system is a not-for-profit co-operative owned by its customers. Customers elect 3 of the 7 members of the Board of Directors. 18PDF Image | Innovative Energy Systems Workshop
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