Indoor Thermal Comfort

Chilled beams have 2 key aims; to be the most energy efficient HVAC system available contributing to Green star ratings, and the most comfort oriented equipment to the point where especially for passive schemes, the building’s occupants are unaware of how the occupied zone is kept at temperature, it just is the right feel.

Operating to whisper quiet and draft free outputs, chilled beams represent the best in cooling technology, imperceptibly maintaining the space design conditions.

Indoor thermal comfort for a commercial office space, school or education facility, or healthcare project (non-invasive areas) is defined by European norm ISO7730:2005 and at time of compiling, there is no direct Australian standard covering this area.  The aim is to keep draft risk as low as possible with a “turbulence intensity” within design limits for the category of building being considered, either Category A, Cat B or Cat C.


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.

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Climate Technologies is owned by Symphony Limited. Cooling the world since 1939, Symphony is one of the world leaders in evaporative cooling with its products sold in 60 countries through 30,000+ retailers and 1000+ distributors around the globe. Fostering a culture of invention, inclusion and inspiration, Symphony have continually been at the forefront of innovation delivering its customers futuristic product designs with a relentless commitment to energy conservation.

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