An assessment of common assumptions in estimating cooling loads and space temperatures

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TypeArticle
Journal titleASHRAE Transactions
ISSN0001-2505
Volume71
Issue2
Pages7280; # of pages: 9
Subjectair conditioning; ambient temperature; linear algebraic equations; thermal properties; heat transfer; Building envelope; conditionnement d'air; temperature ambiante; equation algebrique lineaire; propriete thermique
AbstractThis paper describes the results of an analytical study to determine the errors involved in using a linear methematical model to calculate with sufficient accuracy the elements of an air-conditioning installation; the purpose of the study is also to evaluate the effect of the architectural characteristics of a building on its cooling load. It is felt that a linear mathematical model, with the help of a digital computer, would predict cooling loads for air conditioning at reasonable cost. The linear mathematical model is based primarily on the assumption that convection and radiation heat transfer is directly proportional to the respective temperature differences. The calculations reveal that the cooling load is not closely related to the heat transfer coefficients of the surfaces. The results indicate that the mathematical model using a combined heat transfer coefficient for inside surfaces does not accurately represent the room thermal balance; in calculating the cooling load, similar elements in the room can be considered as a unit forming part of its envelope; in addition, lightweight room elements must be accounted for.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-328
NRC number9785
1840
NPARC number20377168
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Record identifier31a2de05-fa83-4927-9b3b-0132d80b5ff9
Record created2012-07-24
Record modified2016-05-09
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