Distributed SDH system

The distributed solar district heating system assumes that the produced solar heat is always fed into a distribution network which at any time can absorb the solar heat completely. Hence no self consumption is taken into account and the energy turnover in the distribution network is always big compared to the solar heat input.

The following graph shows the hydraulic concept of a distributed solar district heating system. The solar collector field is connected via an heat exchanger but without additional components like buffer tanks or similar to the distribution network. The feed in occurs from the networks return line into the network forward line with user defined forward temperatures between 70 °C for a low temperature distribution network and 110 °C for a high temperature distribution network. To reach those feed in forward temperatures as often as possible both pumps around the solar heat exchanger are operated as matched-flow pumps.