Abstract
The aim of this article was to determine the energetic effect of adapting the control method of district heating substation to a solution using dispersed heat storage. The current control method of district heating substation uses the equations for regulating the temperature distribution of the installation water based on the value of the external temperature. This control method causes a significant amount of heat not consumed by end users. To adapt the control method to a solution using dispersed heat storage the following values were analyzed: the forecast of external temperature and duration of episodes with the lowest external temperatures on the heat output of the district heating substation based on 63 heating seasons. Obtained results were presented for a district heating substation in Poland. The analysis shows that a temperature of -15°C can be adopted as the reference to determine the expected heat output of the district heating substation. On this basis the demand for heat output for central heating purposes was 406 kW instead of 430 kW. The energetic effect of use dispersed heat storage to compensate the reduced heat output of the district heating substation was 24 kW with a compensation time of 24.2 h.
Highlights
Searching for the possibility of reduction of low emissions makes district heating systems an interesting solution [1]
An assumption of the analysis is to demonstrate the nominal potential of determining the equivalent heat output of the district heating substation with use of distribution and forecast of air temperature and active heat storage
Water volume of heat accumulator 10 m3 values due to source heat output reduction and compensation times
Summary
Searching for the possibility of reduction of low emissions makes district heating systems an interesting solution [1]. Due to maintaining profitability, existing district heating systems are not suitable for supplying large areas with relatively small heat demand. The development of district heating systems is heading towards the idea of an energy-efficient district heating or cooling system [2,3,4]. There is a need to create new solutions adapted to the technologies of energy-efficient district heating systems [7]
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