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Engineering design construction and testing of a salt-water absorption unit optimized for use with a solar collector heat source

Description: The development of a 3 ton direct evaporatively cooled LiBr chiller and the construction of three operable field test units suitable for use with flat plate collectors is reported. Compared to conventional LiBr chillers using shell and tube heat exchangers and a separate cooling tower this approach aims to reduce first cost, installation cost and parasitic power. The unit is packaged into a size approximately 94 cm square and 2 meters tall. It produces 7.2/sup 0/C (45F) chilled water with a .72 COP when fired with 89.4/sup 0/C (193F) hot water while rejecting heat to 25.6/sup 0/C (78F) wb ambient air. Power to operate the condenser fan, solution pump and surface wetting pump is 450 watts. This unit deals with water freezing by making the sump and wetting pump freeze resistant so that seasonal draining is not required. Low heat flux through the wetted surfaces yields performance insensitivity to the accumulation of scale.
Date: March 1, 1979
Creator: Ferguson, T. & Merrick, R.H.
Partner: UNT Libraries Government Documents Department

Modeling of Uncertainties in Major Drivers in U.S. Electricity Markets: Preprint

Description: This paper presents information on the Stochastic Energy Deployment System (SEDS) model. DOE and NREL are developing this new model, intended to address many of the shortcomings of the current suite of energy models. Once fully built, the salient qualities of SEDS will include full probabilistic treatment of the major uncertainties in national energy forecasts; code compactness for desktop application; user-friendly interface for a reasonably trained analyst; run-time within limits acceptable for quick-response analysis; choice of detailed or aggregate representations; and transparency of design, code, and assumptions. Moreover, SEDS development will be increasingly collaborative, as DOE and NREL will be coordinating with multiple national laboratories and other institutions, making SEDS nearly an 'open source' project. The collaboration will utilize the best expertise on specific sectors and problems, and also allow constant examination and review of the model. This paper outlines the rationale for this project and a description of its alpha version, as well as some example results. It also describes some of the expected development efforts in SEDS.
Date: September 1, 2006
Creator: Short, W.; Ferguson, T. & Leifman, M.
Partner: UNT Libraries Government Documents Department