This standard deals with the planning, erection and operation of liquid-cooled space-chilling surfaces (in ceilings, walls and floors) or systems where massive building elements are cooled. In view of different procedures and calculation methods, this standard is intended to afford better reliability in the dimensioning of systems, support fair competition and provide better transparency for all parties involved in order processing. The revision of the 2011 edition includes references to new rules of technology and editorial modifications to the text. The example calculation was also adapted.