## Permanent URI for this collection

## Browse

### Recent Submissions

Publication Design And Analysis Of A Hub For A 50-Horsepower, Three Bladed Wind Energy Conversion System(1978) Manfredi, Louis JosephPublication Optimizing Output Power of a Variable Speed Synchronous Generator by Controlling Excitation and Load Restistance(1980) Edds, Michael GeorgeSince 1973 the University of Massachusetts Energy Alternatives Program has been involved in a project, the UMASS Wind Furnace (WF-1) which is directed at supplying the heating needs of households in northern climates. This project had as its inception an attempt to design and build fiberglass rotor blades. Since then the combined efforts of students and faculty from many engineering departments have produced a facility whose purpose is the study of wind and solar energy for useful purposes. The current Wind Furnace Model (WF-1) utilized a wind-driven electromechanical system to generate electrical energy. This energy is then dissipated through resistance heaters and either stored thermally or delivered directly to the house. It is the theory and design of the electrical power system that is the primary topic of this report. In 1974 during the design stage o f the Wind Furnace, I volunteered to work on the electrical power system for this wind turbine generator (KTG). Basically this involved describing how the generator was to be used to provide heat to the house and how it would interface with the rest of the KTG. As a beginning I was given a plot of output power as a function of wind speed representing the desired WTG performance. This preliminary curve, Figure 1, was based on the best estimates available a t that time o f the performance o f the blades and mechanical transmission coupled to a crude model of the generator, based on the manufacturer's data sheets (see Appendix A). The curve in Figure 1 shows the output power as a cubic function at wind speed, with rated conditions o f 25.32 Kw at 26.1 mph. The final cubic curve, Figure 2, has as rated conditions an output of 25 Kw a t 26.1 mph, and 1800 rpm at the generator. The low end of the generator's speed range, 400 rpm, was set by the cut-in wind velocity of approximately 6 mph. It was my opinion then that a better generator model was needed in order to arrive at a method of controlling the generator for the desired output. That concern has led to this thesis.Publication Utilization And Examination Of A Mass Consistent Wind Flow Model(1983) Carrol, Joanne MMATHEW, a mass consistent wind flow model is applied to given areas in Princeton and Windsor, Massachusetts for the purpose of determining wind flow fields in those areas and examining the HATIIEW program itself. The MATHEW model which was originated by Sherman at Lawrence Livermore Laboratories to give a three-component time-independent nondivergent wind velocity field. The model has been verified by its creators and is accepted as a valid method for calculating wind fields. A description of the model is given. The analytic foundation of the model is elucidated, the numerical technique is described and the architecture of the MATHEW progrm is documented. All other pertinent programs required to implement MATHEW are recognized. Input information required by the MATHEW progrm is divide in to two groups, input (physical data and input parameters (which define the grid structure used in MATHEW's numerical solution technique algorithm). The input parameters govern the way that the MATHEW model interprets input data. The relationship between input parameters and MATHEW's interpretation of input data is examined. The means by which MATHEW conditions input topographic data is demonstrated. MATHEW's input parameters are confined to lie within a given--range. Geometric, data and storage space limitations are defined and investigated. Five tests (which compare output runs) are performed. The output of a MATHEW run is an adjusted wind velocity field. Input and output isotach maps and topography maps of actual and conditioned contours are test results. Ths results are analysed visually and mathematically. Observation of the computational progression of MATHEW's solution algorithm is performed. Results from the mathematical analyses and algorithm inspection are presented. Conclusions which summarize all observations and visual analyses from Tests I thru V are presented. These conclusions, listed in Table 6 , define the relationship between input parameters and MATHEW'S interpretation of input data and determine MATHEW's geometric, data and stroage space limitations. A recommended schedule procedure (Table 7) for input parameter determination is given. The suggested schedule procedure coupled with the Conclusion Summary Table provides guidelines for the potential MATHEW user, increases the facility of its use and enhances the viability of the model. A ll conclusions and observations are offered as an effective way to evaluate the merit of the modelPublication Mathematical Modeling Of The Dispersion Of Air Pollutants From Highways(1978) Bauver, Wesley PThis work discusses the theory of the HIWAY and California Line Source highway air pollution dispersion models and describes the EPA emissions model which is used to provide emission factors for these models. A parametric study of the dispersion models is performed to show the effect of the various inputs to these models on predicted pollutant concentrations. These results indicate certain cases in which one model should be used instead of the other. These models are used to perform air quality, environmental impact assessments of two highway projects in Massachusetts. Mesoscale Analyses are also performed for these highways. Advances in modeling the dispersion of pollutants from highways and possible rnodifications to the California Line Source and HIWAY models are also discussed.