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Day 3 – March 21, 2003 Optional Tour of NELHA (Natural Energy Laboratory of Hawaii Authority) – Keahole, Hawaii The tour was attended by Dr. Rezachek of DBEDT, Lanny Joyce of Cornell University, and John and Karen Andrepont of The Cool Solutions Company. Tour and Discussion of NELHA Jan C. War, Operations Manager – NELHA Mr. War provided an in-depth overview of the history and activities of the NELHA facility. Slides, poster-presentations, and a walking tour of some of the facilities helped to illustrate the varied activities. • The newest and largest seawater pipeline at NELHA is a 55 inch diameter HDPE pipeline 9,000 ft long and 3,000 ft deep. It has the capability to deliver 4 oC (39 oF) seawater at a rate of up to 27,000 gpm. However, the initially installed pumping systems will only provide up to 7,000 gpm. • NELHA also operates warm (surface) seawater intake pipes at 24 to 28 oC (75 to 82 oF). Most tenant users at NELHA employ blended water at temps of 16 to 18 oC (60 to 65 oF). • NELHA charges tenants for their land, plus $0.08/kgal for cold seawater and $0.06/kgal for surface seawater. These current water tariffs cover incremental operating costs (but not the large initial capital costs). The tariffs may be increased somewhat in the future, especially as NELHA is under pressure to become self-funding. • Andrepont noted that, if used at full capacity for cooling, and assuming a 15 oF Delta T, the 55 inch pipeline could provide ~17,000 tons of cooling. The effluent temp would still be only 12 oC (54 oF),i.e. colder than temperature used by most NELHA tenants. • Andrepont noted that, at least hypothetically, and based on the current NELHA cooling water tariffs, a cooling user could purchase deep cooling water at a rate of only $0.008/ton-hr. And, if the effluent were returned and credited at the current warm water tariff (even though the effluent is still much colder), the net cost would be reduced to only $0.002/ton-hr. (For perspective, “typical” DC tariffs in the mainland U.S. have a “consumption charge” (to cover marginal production cost) and a “capacity charge” (to cover capital and other fixed costs). The marginal consumption charges will generally be in the $0.07 to 0.10/ton-hr range, or higher, with total costs to customers varying from $0.20 to $0.35/ton-hr, or more, depending on annual cooling load factors.) • NELHA tenants all operate in parallel with each other. No one returns seawater into the cold water or surface water supply headers. 38PDF Image | Innovative Energy Systems Workshop
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