EVALUATION AND IMPROVEMENT OF THE CONTROL STRATEGY OF THE 10 000 m² SOLAR HEATING PLANT IN KUNGÄLV, SWEDEN

摘要

The solar district heating plant in Kungaelv, Sweden, was modelled in order to evaluate the control strategy. A weak point analyses was carried out to suggest an improved control strategy to reach a higher yearly solar thermal output from the collector array. Complementing the available monitoring data with simulation results it could be shown that the present control strategy is not operated with a matched flow control as originally planned. Simulations of a matched flow control show a positive effect on the solar thermal output. A simulation study with variations of the control strategy and some operation parameters result in a possible increase of the solar output of up to 22 %.