DIN EN 12831-3:2017-09

This document (EN 12831-3:2017) has been prepared by Technical Committee CEN/TC 228 "Heating systems and water based cooling systems in buildings", the secretariat of which is held by DIN. The responsible German committee is Working Committee NA 041-01-58 AA "Heizungsanlagen und wassergeführte Kühlanlagen in Gebäuden (SpA CEN/TC 228)" ("Heating systems and water based cooling systems in buildings (mirror committee to CEN/TC 228)") at DIN Standards Committee Heating and Ventilation Technology and their Safety (NHRS). This European Standard describes a method to calculate the power and the storage volume required for the dimensioning of domestic hot water systems (DHW). The applicability ranges from direct water heaters (no storage volume and a comparatively large effective heating power) to larger storage systems with a comparatively small heating power and large storage volumes. This European Standard is applicable to the following water storage systems: - storage systems characterized by a minimal mixing zone, (such as stratified charging storage tanks or storage tanks with external heat exchangers): these systems are nominated in this standard as "charging storage systems"; - storage tank water heaters and warm water storage tanks with a pronounced mixing zone (such as DHW storage tanks with internal heat exchangers), nominated in this standard as "mixed storage systems"; and for different uses. The Scope also includes standardization methods for determining the energy need for domestic hot water. This European Standard covers the domestic hot water needs in buildings. The calculation of the energy needs for DHW-Systems applies to residential and non-residential buildings, a building or a zone of a building.