Abstract
Abstract In spite of the progressions in heat storage systems for combined heat and power’ (CHP) plants performance, these innovations have not been implemented in CHP-based district heating (DH) systems in some of the countries where DH systems are still being developed. An examination of environmental and economic advantages that can be gained as a result of heat storage installation into the DH system are necessary to effectively popularise heat storage as a DH system-improvement technology. A real large-scale biomass CHP-based DH system is investigated in this case study. Scenarios for two kinds of support policies (feed-in premium for electricity generated by biomass CHP and energy-efficient biomass CHP) were analysed by changing the extent of the heat storage. The goal of this study was to assess the impact of the biomass CHP policy support instruments on the viability of integrating heat storage. Calculations demonstrate that fitting of heat storage combined with biomass CHP is less viable when all power generated by biomass CHP is subsidised.
Highlights
The district heating (DH) sector has an essential impact on potential energy savings, allowing aggregated heat loads to gradually optimise energy supplies and transition to far more sustainable energy sources
It is rather small and, when compared to the best practice examples shown in Fig. 1, it is evident that the size range for such type and capacity of combined heat and power’ (CHP) accumulator tanks starts at 3200 m3
For scenario B, where only the power generated during the biomass CHP mode is subsidised, based on Net Present Value (NPV) parameter, the optimal size of the accumulator tank is around 7000 m3
Summary
The district heating (DH) sector has an essential impact on potential energy savings, allowing aggregated heat loads to gradually optimise energy supplies and transition to far more sustainable energy sources. Other benefits of DH include: reliable heat supply, reduction of heat generation costs, and possibility to use renewable energy sources [1], [2]. The energy efficiency of DH systems has increased significantly, due, in part, to the introduction of the 4th Generation DH concept in 2014, which presents ideas on the upgrades necessary for the future sustainable evolution of DH. This concept has been extensively reviewed by the international scientific community [7]–[9]. Another advantage provided by heat storage is the extension of the period when heat can be produced in CHP mode
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