EN 12831-1 : Energy performance of buildings - Method for calculation of the design heat load - Part 1: Space heating load, Module M3-3.

This document defines the methods for calculating the design heat load of individual rooms, building units, and buildings. This load corresponds to the thermal power required to maintain the specified indoor temperature under standard outdoor design conditions. It also positions the standard within the overall set of EPB (Energy Performance of Buildings) standards, in accordance with the modular structure of EN ISO 52000-1. CEN ISO/TR 52000-2 presents, for each module, the published or developing EPB standards and associated technical reports. The modules represent the EPB standards, noting that a single standard may cover several modules and that a module may be addressed by several standards, particularly where both a simplified method and a detailed method exist. Additional information is provided in Clause 2 and in Tables A.1 and B.1.