Category C is the most commonly desired design standard for commercial office space etc, aiming to maintain air velocities at a mean maximum of < less than 0.25m/s within the occupied zone (NOT average), which is accepted as being the correct maximum figure to use in the Australian construction industry, validating the ISO as the correct benchmark to adhere to.
For definitions and an abridged version of the standard and organisation called the CBCA have published several useful documents which are available by clicking here.
In order to assist engineers and contractors maximise the benefits of chilled beams, a document was compiled to offer a series of bounding limits to ensure the indoor thermal comfort environment complies with ISO7730:2005 PPD<15%. This document, entitled “An introduction to Chilled Beams and Ceilings” which lays out best practice design parameters to stay within to ensure good indoor thermal comfort. A copy of the document is available for download by clicking here.
This document aims to advise engineers not to over design the system by trying to achieve too high a capacity from the equipment, typically by using primary air and chilled water volumes at too low a temperature or primary air volumes exceeding the maximum sensible for the length of beam being considered.