Solar heating systems are usually divided into two main groups: active and passive systems. As opposed to a passive solar heating system an active solar heating system needs to be supplied with energy in order to work. This energy is usually supplied in the form of electricity and serves to operate pumps or ventilators. Passive solar heating systems on the other hand are characterised by the fact that heat transport is carried out by processes which do not require an energy supply.
Solar heaters for heating hot tap water are widespread in southern Europe and other parts of the world. An investment in a solar heater is a very lucrative investment as it pays back itself after 1-2 years.
The utilisation of daylight in buildings in order to save energy, increase comfort and productivity, an important factor in many projects at SINTEF and NTNU.
A daylight laboratory for physical model experiment has been established at NTNU to effectively and dynamically illustrate light conditions in a room. At NTNU and in association with SINTEF, several PhDs on the topic of daylight have been carried out (or are currently in the process of being carried out).