Evaluation of thermal energy storage requirements for a geothermal based district heating system Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fn107263r

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  • The thermal energy storage requirements for a district heating system utilizing geothermal energy is evaluated with respect to the system design heating load and local climatic conditions. The local climate pattern is represented by a series of events which characterize the nature and sequence of the cold spells that can be expected during the winter. The events are defined as those days in which the average daily temperature is less than 10°F above the 97.5% design temperature. All energy storage is assumed to be accomplished by the use of a hot water storage tank. Three different standards for evaluating the required storage capacity are used. First, the worst case storage capacity that is capable of providing the entire peak thermal energy demand above that produced by the geothermal resource is found for the most severe weather events recorded in the past 20 years for several cities across the United States. Secondly, the storage tank capacity is sized to provide at least some thermal energy storage 99% of the days during the heating season, November 1 to March 31, by simulating the storage tank operation over the 20 year period. Finally, an economic analysis is performed which finds the lowest cost method of providing peaking energy to the district heating system, either by the incorporation of thermal energy storage or by the installation of a peaking boiler. The ratio of the system design heating load to the maximum sustainable resource well production rate (LDRATIO) is found to have an extremely important influence on the storage requirements. A LDRATIO limit of approximately 1.6 is suggested when designing a geothermal district heating system, due to rapidly increasing peaking energy requirements and total peaking system costs for a LDRATIO above this level. The unit peaking energy is also found to be a minimum at a LDRATIO of 1.6. District heating systems located in cities characterized as having a maritime climate were found to be better suited to the application of thermal energy storage than colder inland localities. Recommended storage tank capacities for cities in the United States are given based upon a multivariate regression analysis relating the minimum cost storage sizes as a function of several common climatic parameters. In order to help decide whether incremental additions to the system heating load should be met by drilling another resource well or by adding to the peaking system capacity estimates are made of the minimum unit peaking energy cost.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-08-27T17:40:02Z (GMT) No. of bitstreams: 1 LawrenceThomasM1982.pdf: 955064 bytes, checksum: 626744c2419f64f30b8d2d0272b90ca0 (MD5)
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