Energy efficient production and distribution of hot domestic water in dwellings

It is assumed that production and distribution of hot domestic water in buildings will make up an unsuitably great part of future energy frames. Based on an analysis of existing conditions, it is therefore the aim of this project to propose solutions that are more energy efficient and environmentally sound.

Measurements and analysis will be made of 10-12 recently built dwellings (multi-storey dwellings, terrace houses, low/dense building).

After analysing existing conditions a proposal for a more energy-efficient hot domestic water production will be elaborated. Methods for reducing the heat loss from the hot water production and distribution is analysed, including the new types of tubes (co-isolated tubes, concentric tubes), that are expected to reduce the heat losses by up to 40 %. The energy frame and environmental conditions are compared for different solutions. Apart from the importance of reducing heat losses inside the building, maintaining a low return temperature for the hot water system have great significance for the heat loss in the district heating system, where buildings are heated by district heating.

The results will be significant not only for future buildings, but also for renovation projects in existing buildings.