Página 5 dos resultados de 476117 itens digitais encontrados em 0.061 segundos
Resultados filtrados por Publicador: MIT Energy Laboratory

‣ How much do you know about energy? : a quiz from the Energy Lab

Energy Laboratory
Fonte: MIT Energy Laboratory Publicador: MIT Energy Laboratory
Tipo: Trabalho em Andamento Formato: 1821314 bytes; application/pdf
Português
Relevância na Pesquisa
423.67906%

‣ Planning and analysis for development and commercialization of photovoltaic energy conversion systems : final report

Massachusetts Institute of Technology Energy Laboratory in association with the Sloan School of Management and the Dept. of Urban Studies and Planning..
Fonte: MIT Energy Laboratory Publicador: MIT Energy Laboratory
Tipo: Relatório Formato: 2403444 bytes; application/pdf
Português
Relevância na Pesquisa
423.67906%
Near term consideration of development and commercialization requirements of photovoltaic power systems will increase the potential information generated during the experimental and field test phases of the photovoltaic technology development process. This report summarizes the research activities of the MIT Energy Laboratory Photovoltaics Project during its first year. The report discusses results of residential systems modeling, or market survey analysis and institutional analysis carried out in conjunction with the large scale photovoltaic field test at Mead, Nebraska, preliminary analysis of the social and environmental costs of photovoltaic power system development relative to conventional electrical power generation and the development of energy system R&D decision models. In addition, the report lists project reports and briefly discusses research work to be carried out in the second year of the project.; Prepared for the United States Dept. of Energy under Contract EX-76-A-01-2295, Task Order 37.

‣ Assessment of integrated urban energy options

Pine, Gerald Dean
Fonte: MIT Energy Laboratory Publicador: MIT Energy Laboratory
Tipo: Relatório Formato: 8310651 bytes; application/pdf
Português
Relevância na Pesquisa
424.2566%
An initial comparison is carried out for the following residential space and water heating options: electric resistance heating, electrically- driven heat pumps, distribution of condenser temperature water combined with heat pumps to extract heat at the point of use, district heating via hot water from a combined heat-electric utility energy source, and individual gas furnaces. This comparison indicates that district heating is potentially competitive with conventional technologies for new urban areas. A more detailed analysis of the district heating option is undertaken to clarify its economics. Base case urban models, economic assumptions and distribution networks are defined and a computer program is developed to select optimum pipe sizes for the networks and to calculate life cycle costs. Cost optimization is carried out by considering thermal energy production costs as well as thermal conveyance costs. Because of the large number of variables entering into the cost determination, sensitivity analyses are performed to examine the effects of variations from base case assumptions. Variations in the installed pipe cost, interest rate, maintenance costs and degree of market penetra- tion are shown to have the greatest effect on energy cost. Pumping power and heat loss are found to be relatively insignificant cost items. Proper phasing of system inplementation with urban growth is shown to be very important. Initial use of temporary heat sources located near the loads coupled with implementation of only local piping networks is advantageous for present gas and oil prices if the urban growth occurs over a period of 15-30 years. There is shown to be an economically optimum time for conversion to a large centralized thermal energy source. Several potential institutional barriers to district heating system implementation are identified. These barriers will be more difficult to overcome than any technical or economic barriers...