Design requirements for water supply and sewage systems in the energy savings certificates in the construction industry

Abstract

The paper presents problems related to the design and installation of systems for greywater use in indoor installations in buildings in Poland. These problems are related to the lack of references in the current legislation, appropriate technical terminology in Poland, and appropriate design guidelines and regulations for the dual installations. The study was based on the most popular in the world certifi cation systems according to which investors obtain green certifi cates of buildings. In these rules, in addition to a whole range of requirements are also requirements for indoor installation, including dual installations. The second issue is putrescibility time for grey wastewater. For this purpose, samples were taken and measurements of their putrescibility time were made depending on the chemical composition. Dual Installation enables a signifi cant saving of drinking water. Unfortunately, in Poland there is no clear regulations governing the design and construction of this type of installation. Often the cost of the installation exceeds the economic benefi t of saving water.