Tol, Hakan İbrahim; Svendsen, Svend - In: Challenges 4 (2013) 1, pp. 1-16
Low-Energy District Heating (DH) systems, providing great energy savings by means of very low operating temperatures of 55 °C and 25 °C for supply and return respectively, were considered to be the 4th generation of the DH systems for a low-energy future. Low-temperature operation is...