Graduate Thesis Or Dissertation
 

Performances, constraints, and problems related to three residential solar systems

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  • The purpose of this study was to clarify the relationships between the performances, constraints, and problems identified by the respondents and the inclusion of each of three types of passive solar system: direct gain, Trombe wall, or greenhouse, into the design. The objectives of this study were: 1) to describe the respondents and their houses, 2) to determine whether or not there were relationships between performances and types of passive solar system, 3) to determine whether or not there were relationships between constraints and types of passive solar system, and 4) to determine whether or not there were relationships between problems and types of passive solar system. To determine the relationships, hypotheses were tested. The data for the analyses were obtained from a survey, "Post Occupancy Evaluation of Passive Solar Homes in Oregon." In June 1982, mail questionnaires were sent to the sample of 154, selected from a list of applicants for residential passive solar tax credits from Oregon Department of Energy. The Mann-Whitney test was utilized to test relationships between performances and types of passive solar system and between constraints and types of passive solar system. The t-test was employed to determine whether there were relationships between overall performances and types of passive solar system and between overall constraints and types of passive solar system. The chi-square statistical test was used to determine whether there were relationships between problems and types of passive solar system. Frequency distributions were utilized to develop descriptions of respondents and their houses. Respondents were characterized as males, median age of 41 years, four-year college graduates, with a median gross family income in the category of $30,000 through $39,999. The respondents lived in houses characterized as detached single family with a combination of direct gain and greenhouse passive solar systems with concrete heat storage and a size in the category of 1500 through 1999 square feet. The majority of houses were located outside city limits and sited true south, while the median number of rooms in houses was six. There were significant (p≤.05) differences in the occurrences of problems with: 1) coverings for sloped windows (p=.0062), 2) excessive glare (p=.0469), and 3) excessive humidity (p=.0371) between greenhouse and non-greenhouse houses. Although few respond ents reported these three problems, greenhouse respondents had more problems with 1) coverings for sloped windows and 2) excessive humidity while non-greenhouse respondents had more of a problem with excessive glare. This study investigated relationships between performances, constraints, and problems and types of passive solar system. The description of the respondents and their houses and the null hypotheses findings will be very important for educators and researchers concerned with housing, professionals in the housing industry, current and future occupants of solar houses, and politicians when they consider laws affecting housing programs. For example, the finding that greenhouse respondents had more problems with coverings for sloped windows and excessive humidity while non-greenhouse respondents had more of a problem with excessive glare will be especially important for architects and builders to know as they explore ways to improve the design of solar housing.
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