What is ISO 11855-4 about?
ISO 11855-4 is the fourth part of multiple series that allows the calculation of peak cooling capacity of Thermo Active Building Systems (TABS), based on heat gains, such as solar gains, internal heat gains, and ventilation, and the calculation of the cooling power demand on the waterside, to be used to size the cooling system, as regards the chiller size, fluid flow rate, etc.
ISO 11855-4 defines a detailed method aimed at the calculation of heating and cooling capacity in non-steady-state conditions.
NOTE-
The methods do not apply to heated or chilled ceiling panels or beams.
ISO 11855 series is not applicable for the testing of systems.
It does not apply to panel systems with open-air gaps which are not integrated into the building structure.
Who is ISO 11855-4 for?
ISO 11855-4 on building environment design is useful for:
- Construction industry
- Civil engineer
- Architect
- Manufacturer installer or supplier of building material
- Building contractor, operator, investigator, manager
Why should you use ISO 11855-4?
ISO 11855-4 provides a dimensioning and calculation method which helps you to design Thermo Active Building Systems (TABS) for energy saving purposes, since radiant heating and cooling systems can reduce energy consumption and heat source size by using renewable energy.
ISO 11855-4 helps thermally active building surface (TABS) for utilizing the concrete's thermal mass by embedding pipes carrying water for heating and cooling in the building's structure, where the pipe is embedded in the central concrete core of the building construction.
ISO 11855-4 provides a detailed method which assists you in the calculation of heating and cooling capacity in non-steady-state conditions. Whenever results of TABS calculations are reported, the computer program applied is specified. To facilitate dynamic computer simulations of buildings with embedded radiant heating and cooling systems, the equivalent resistance between the heat conduction layer (pipe level) and the upward and downward surfaces can be used.
What’s changed since the last update?
BS EN ISO 11855-4:2021 supersedes BS EN 15377‑3:2007 which is withdrawn.
This second edition cancels and replaces the first edition (ISO 11855‑4:2012), which has been technically revised.
The main changes compared to the previous edition are as follows:
- Editorial corrections
- Picture redraws
- Updated bibliography
- Improved wording