Thermal design of buildings, Rooms, Temperature, Performance, Thermal comfort, Air-conditioning systems, Mathematical calculations, Ventilation equipment, Thermal environment systems, Buildings, Energy consumption, Ventilation This European Standard covers the calculation of the operational parameters and the energy consumption of cooling generation systems. The cooling generation consists of: — cooling generators like compression and absorption chillers; — other (generic) generator types such as ground or surface water or direct use of ground heat from boreholes; and — different types of heat rejection (dry, wet, hybrid with outdoor air, other sink types). The methods cover: — the possibility of heat recovery of heat to be rejected for the use of heating and/or domestic hot water production, through the use of an interface to the M3-1 standard; and — a multi generator calculation. The document does not cover the cooling emission, distribution and storage systems, which are covered by the Module M4-5, M4-6 and M4-7 standards, respectively. It is directly connected to the general part of the cooling systems, the M4-1 standard.