Experimental characterization of a prototype of bidirectional substation for district heating with thermal prosumers

摘要: Abstract The prosumer, already widespread in the electrical sector, is still uncommon district heating (DH) sector. Nevertheless, this figure can potentially provide a relevant contribution to increase renewable fraction of heat and decrease fossil fuel consumption, hence enhancing sustainable efficient heating. Moreover, prosumers are more informed responsible towards energy production savings. In order enable two-way exchange, thermal substation at interface between prosumer DH network must be properly upgraded. present paper aims providing comprehensive design testing an innovative bidirectional for active heating, focusing on hydraulic configuration control strategies. realized primarily fulfils prosumer’s demand supplies excess only if it available temperature contractually defined with operator, while uses as source local not sufficient cover user’s demand. prototype, technology readiness level TRL 4, connected generic micro-generation system, e.g. solar or recovery units. An extensive test campaign has been carried out evaluate its dynamic behavior both from energetic points view. Test confirmed reliable operation substation, which able handle simultaneous exchanges system pressure loss lower than 0.2 bar temperatures within ±0.6 °C prescribed setpoint after transients shorter 5 minutes, even ±10 step changes inlet fluid temperatures.