A B S T R A C T R I~ S U M I ~Embedded cooling pipes can be used to reduce the temperature rise in massive structures as a measure against thermal cracking. When air is used as a cooling medium, relatively large diameters with profiles causing friction losses along the pipe are preferred. In this paper, heat transfer coefficients for two different types of cooling pipes have been determined for different pipe flows in combination with various temperature levels. This paper relates to the first part of the investigation dealing with the laboratory tests of heat transfer coefficients. The second part, dealing with application in design, is presented in "Air cooling of concrete by means of embedded cooling pipes -Part II: Applications in design" [1].
resumThis paper relates the second part of the investigation of air-cooling in concrete; the first part is presented in "Air cooling of concrete by means of embedded cooling pipesPart I: Laboratory tests and heat transfer coefficients" [1]. Embedded cooling pipes are used to reduce the risk of thermal cracking in early age concrete. Traditionally, water has been used as a cooling medium, but air cooling has been shown to be advantageous for many applications. The experimentally-determined heat transfer coefficients of cooling pipes [1], have been used and verified in comparisons of in situ measurements at the Igelsta Bridge in S6dertSlje, Sweden. The close agreement between measured and calculated temperatures of air-cooled sections seems to justify the use of the averaged heat transfer coefficients determined in [1].Some exemplifying calculations are also shown, and the general behaviour of cooled structures is discussed. The principles of designing a coohng system for a general case are proposed. It is concluded that it is possible to design prismatic structures, such as a columns, by the use of existing models and measured heat transfer coefficients.
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