EN 15255:2007 – Energy performance of buildings – Sensible room cooling load calculation – General criteria and validation procedures

1 Scope
This European Standard sets out the level of input and output data, and prescribes the boundary conditions equired for a calculation method of the sensible cooling load of a single room under constant and/or floating temperature taking into account the limit of the peak cooling load of the system. It includes a classification scheme of the calculation method and the criteria to be met by a calculation method in order to comply with this European Standard.
The purpose of this European Standard is to validate calculation methods used to:
 evaluate the maximum cooling load for equipment selection and cooling system design;
 evaluate the temperature profile when the cooling capacity of the system is reduced;
 provide data for evaluation of the optimum possibilities for load reduction;
 allow analysis of partial loads as required for system design, operation and control.
The validation procedure is used to check the room sensible heat balance model, taking into account:
 the external surface heat balance;
 the conduction through the building envelope;
 the effect of the thermal mass of the structures;
 the internal surface heat balance;
 the air heat balance;
 the heat balance solution method.
All other aspects are given either by fixed boundary conditions or by input data and are not in the focus of the model validation. It is assumed that for all these other matters e.g. embedded heating and cooling systems, prescriptive models have to be used according to existing European Standards.
Informative Annex A gives a simplified method for cooling load calculation.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 410, Glass in building — Determination of luminous and solar characteristics of glazing
EN 13363-2, Solar protection devices combined with glazing — Calculation of total solar energy transmittance and light transmittance — Part 2: Detailed calculation method
EN 15377-1, Heating systems in buildings — Design of embedded water based surface heating and cooling systems — Part 1: Determination of the design heating and cooling capacity
prEN ISO 6946, Building components and building elements — Thermal resistance and thermal transmittance — Calculation method (ISO/DIS 6946:2005)
EN 15255:2007 – Energy performance of buildings – Sensible room cooling load calculation – General criteria and validation procedures