Field practices as bases for evaluating and improving a college-level air-conditioning drafting course Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8w32r914n

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  • This study deals primarily with the evaluation and improvement of the content of a college-level drafting course for air conditioning engineering students. The necessity for better integration of the mechanical and architectural elements contained in the course, and an adequate coverage of field drafting room practices were the chief evidences of the need for the study. The purpose of this study was to develop criteria that could be used to evaluate and improve said drafting course; and the end result was manifested by an improved proposed drafting course, which was included in the Appendix. The study was conducted in the Los Angeles Metropolitan Area. Eighteen carefully selected air conditioning and refrigeration firms were interviewed to determine the per cent frequency of occurrence of selected field drafting room practices. This group represented contracting firms, consulting engineering offices, controls companies, and manufacturing firms. Chapter II presents a brief history of the development of the air conditioning and refrigeration industry. Special attention was given to the contemporary applications and to the need for specialized training on a college level. The collected field data was tabulated, analyzed and classified in Chapter III. This field data represented percent frequency of occurrence responses concerning drafting room practices covering the following nine general areas: (1) floor plans; (2) duct work; (3) piping drawings; (4) controls; (5) equipment rooms; (6) manufacturing; (7) sketching; (8) drafting techniques; and (9) drafting material. Five orders of classification were established: (1) standard practices; (2) common practices; (3) occasional practices; (4) infrequent practices; and (5) obsolete practices. Chapter IV contains the summary, conclusions and recommendations. The conclusions reached the were as follows: (1) ranked practices can be used as an evaluative instrument; (2) greater weight should be given to standard end common field and area practices; (3) many occasional and infrequent practices are essential practices in the individual firms concerned; (4) practices with broad general concepts should be used as instructional vehicles; (5) a degree of standardization of drafting practices has taken place; (6) a few of the practices have become obsolete; (7) the comprehension of control circuits is beyond most freshmen; (8) there is a trend toward more manufacturing in the area investigated; and (9) sketching ability is highly desirable. It was recommended that the course should be so organized as to bring about the following general outcomes: An understanding of and the ability to apply basic drafting techniques and practices as defined by the A.S.A., and also of those common to the selected field. The following specific recommendations were also made: (1) floor plans drawn, using conventional architectural symbols; (2) two-line duct systems drawn, using field techniques; (3) lettering style should progress from formal to a modified style; (4) piping systems drawn in isometric and orthographic, using a single-line diagrammatic form; (5) no control system; (6) equipment rooms drawn with "blocked" equipment shown; (7) manufacturing drawings developed; (8) improvement of sketching ability; (9) maintenance of the highest drafting standards; (10) use of drafting equipment common to the field; and (11) the inclusion of some sheet metal pattern development.
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