Reference Data

[david-smith]

Reference Data

Author: CIBSE | Size: 2.4 MB | Format: PDF | Quality: Original preprint | Publisher: ELSEVIER | Year: 2001 | pages: 283 | ISBN: 0750653604

Foreword
This 2001 edition of CIBSE Guide C contains significant changes from the previous 1986
edition. Although basic physical data does not change with time, the refinement of measurement
and calculation techniques means that even this basic data needs to be reviewed at
intervals. Additionally, revisions to practice in calculation methods, product selection and
usage led to a requirement for changes in the presentation of the data. Much of the data in
the 1986 edition actually dates from 1970 and was therefore ripe for review.
The changes made for the 2001 edition are summarised below:
Section 1: Properties of humid air. The data tables remain unchanged but the introduction
has been updated. A critique of the data has been published in Building Services
Engineering Research and Technology, to which interested readers are referred (reference 11
to section 1).
Section 2: Properties of water and steam. This section has been reviewed and found to
need no amendment.
Section 3: Heat transfer. This section has been completely rewritten. The theoretical
basis has been reviewed in the light of current knowledge and the calculation procedures
updated. Reference tables have been updated to reflect current practice and needs.
Section 4: Flow of fluids in pipes and ducts. This section has been completely rewritten.
Both calculation methods and reference tables have been updated. In particular, the
opportunity has been taken to replace the limited and oversimplified tables of resistance
coefficients with a more comprehensive and rigorous treatment.
Section 5: Fuels and combustion. This section has been reviewed and comprehensively
updated to take account of changes to fuels and fuel characteristics.
Section 6: Units, standard and mathematical data. This section has been reviewed and
updated. Some obsolete data has been deleted and some extra data added.
These changes have taken a significant amount of time and effort to complete and I would
like to express my thanks to the volunteer authors, contributors, reviewers and CIBSE
staff for their valuable contributions.
Finally, we hope that all users will find this Guide a useful and authoritative source of reference
and guidance.
Paul Compton
Chairman, CIBSE Guide C

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