District Heating Substation with Electrical Heater Supplied by 40 ℃ Ultra-Low District Heating

摘要

District energy has - for the last couple of years - been receiving increased awareness in energy strategy plans of governments and cities and is seen as one of the key drivers for reducing CO_2 emissions by opening up for large-scale application of renewable heat sources. When looking on the generations of DH it is clear that the supply temperature has been continuously decreasing. With the increased share of energy efficient buildings this trend is becoming a must to ensure the cost efficiency of DH systems. Lower supply temperature means not only reduced heat loss from the DH network but mainly easier exploitation of low-grade renewable sources with higher efficiency and thus better economy or utilisation of huge potential of low-grade waste heat being otherwise lost.