CIBSE TM54 Evaluating Operational Energy Performance of Buildings at the Design Stage
This guidance will help to turn low energy designs into low energy buildings that achieve the design energy targets.
As energy costs have risen, there is an awareness among building owners, who hear much about low energy buildings and subscribe to programmes that rate the design of the building, that their ‘low energy design’ turns out to be have a typical energy bill. The performance of low energy designs is often little better, and sometimes worse, than that of an older building they have replaced, or supplemented.
There are two main reasons for this performance gap. This guide addresses the first, which is that the method of calculating energy use for the purposes of compliance does not take into account all the energy uses in a building. In particular, it does not address energy used by lifts and escalators, for catering facilities, or for server rooms. This energy use can be substantial.
This Technical Memorandum (TM) provides building designers and owners with clear guidance on how to evaluate operational energy use more fully, and accurately, at the design stage.