EN 15450 : Heating systems in buildings - Design of heat pump heating systems.

This standard specifies the design criteria for building heating systems using electrically driven heat pumps, either alone or in combination with other heat generators. It covers water-to-water, water-to-air, brine-to-water, direct-expansion refrigerant-to-water, refrigerant-to-refrigerant, air-to-air, and air-to-water systems. It takes into account the heating requirements of auxiliary systems, particularly domestic hot water production, for the purpose of sizing the heat generation system, without addressing the design of those auxiliary systems. Its scope is limited to the heat pump, its interfaces with the heat distribution and emission systems - including the buffer system - the overall control system, and the energy source. Systems primarily intended for cooling, as well as systems capable of operating alternately in cooling or heating mode, are excluded.