Evaluation of the Boleyn solar home, Portland, Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6682x6424

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  • The Boleyn home located in Portland Oregon (latitude 45°) is evaluated based on monitoring data taken from 1977 to 1982. The Boleyn home is a two-story (plus basement) frame home. It takes benefit of passive solar gains and is equipped with an active solar system. The active solar system consists of a 429 ft² (39.9 m²) collector with 3750 gallons (14400 liter) of water for thermal storage. The active solar system and the monitoring equipment were installed by PGE (Portland General Electric Company). The performance of the building and of the active solar system and the validity of models predicting parameters of the home and of the solar system are evaluated. Performance of the home: The Boleyn home is a very well insulated house with low infiltration rate and benefits from passive solar gains obtained from 96 ft2 of glass area to the south. The Boleyn home is heated by four sources: passive solar gains, internal gains, active solar system, and backup system. Reduced transmission losses through the floor area to the basement heated by losses from the solar storage tanks contributes a significant amount of the overall gain from the active solar system. Performance of the active system: The design goal of the solar system to meet 50% of the house heating requirements was exceeded. The performance of the Revere double-glazed collector did not deteriorate over time and matchs the manufacturer's data within 5%. A significant amount of heat was lost through the storage tanks because insulation was lacking on the tanks around penetrations and around the pipes. Heat loss due to thermosyphoning was present before installation of a backf low check valve in the collector loop. The overall efficiency of the system was improved by reducing the pump power in the solar collection loop and installation of an improved backup system. Installation of a domestic hot water preheat tank reduced the domestic hot water load by 73%. Validity of predictive tools: The design heat loss calculated by using the ASHRAE method matched the experimentally evaluated design heat loss within 6%. The annual heating requirements predicted by the degree-day-method by ASHRAE and Calpas3 were accurate within 12% and 21% respectively. A large cooling load caused by passive solar gains predicted by Calpas3 did not occur at the Boleyn home. The Boleyns open the windows and accept higher indoor temperatures than predicted by Calpas3. The active solar fraction predicted by F -chart was 66.3%. The experimentally evaluated value is 74.5%. The heat loss from the solar storage tanks was 3.6 times higher than the prediction performed by PGE, which did not include losses from piping and uninsulated portions of the tank.
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