SOLTAG.net apartments is a prototype of a new prefabricated CO₂ neutral rooftop dwelling, which is build according to the new Danish low energy standard 1. With their design and advanced utilisation of windows, insulation and use of heat recovery ventilation, SOLTAG.net apartments approach the requirements for CO₂ neutrality. They need no tradi¬tional heating system, thus improving the indoor climate and eliminating problems of moisture and condensation.

The CO₂ neutral rooftop apartment is designed with an energy use including operation of fans and pumps which is only 48 kWh/m² - half the size of the allowed energy use in new build housing according to the new Danish energy rules, which by 1.1.2006 reduces the allowed energy use in new build housing to 96 kWh/m². These figures depend on the employment of a solar DHW system and a minor photovoltaic 0.5 kWp installation. If the PV installation is increased to 2.5 kWp, a complete neutral CO₂ status is obtainable.

This means that it is not necessary to connect the apartment to an external, separate heating supply system.

The prototype development has been supported by the EU Demohouse project, The Copenhagen Urban Ecology Fund, The Danish Energy Agency and Elkraft-PSO together with a group of sponsors lead by VELUX in Denmark.

• Architecture and indoor air climate
• Cold bridges and air tightness
• Energy Quality Design philosophy

See also the project SOLTAG.net web site: www.soltag.net

Further information:

Project coordination	Urban Renewal Copenhagen (Byfornyelse København) H.C. Andersens Boulevard 40 DK-1553 Copenhagen V Phone: +45 33 76 60 00 e-mail: byforny@byforny.dk www.byforny.dk
Architect	Nielsen & Rubow A/S Skt. Annæ Passage F DK-1262 Copenhagen K Phone: +45 33 69 11 22 tnr@tnr.dk www.tnr.dk
Technical consultants	Cenergia Energy Consultants Skt. Jacobs Vej 4 DK-2750 Ballerup Phone: +45 44 66 00 99 e-mail: cenergia@cenergia.dk www.cenergia.dk
Prototype manufacturer	JYTAS A/S Århusvej 211 DK-8464 Galten Phone: +45 8694 6800 e-mail jytas@jytas.dk www.jytas.dk