We have identified the possibilities of renewable sources for the district heating system
CTU UCEEB has carried out an analysis for ČEZ Teplárenská on how to replace the existing heat supply from the steam pipeline for the municipal district heating system with a 100% renewable source combining a biomass boiler and a large-scale solar thermal system.
The analysis determined the framework investment costs and the total cost of the heat produced from the source for different sizes of solar system. For further decision making, the option with a gross area of 3 000 m2 of solar collectors and a short-term heat storage volume of 300 m3 was recommended. The total heat demand coverage by the recommended solar system variant is around 17%, with the remaining heat production provided by the biomass source.
The feasibility of the solar system was investigated in three variants: with short-term storage, with long-term (seasonal) heat storage and with the use of a heat pump in a seasonal storage in combination with an ORC-based cogeneration source. The parametric analysis investigated the suitability of flat plate collectors and tubular vacuum collectors, the optimal storage volume in relation to the collector area, and above all the operating indicators (solar thermal yields and heat demand coverage).
