Abstract
This study validates effectiveness of a combined piping system for an apartment using district heating. The existing district heating system is composed of four pipes (four-pipe system), but the suggested combined piping system is composed only of two pipes (two-pipe system). Thanks to this simplification, the two-pipe system will reduce heat loss of supplied heating energy. Performance of the four-pipe system and the two-pipe system were analyzed using TRNSYS 17 in the aspect that 1) If it can provide sufficient heating energy for space heating and hot water simultaneously, and 2) How much of the heat loss of the hot water supply pipe may be reduced. Measured energy consumption were compared with simulation results, that revealed good agreement. This study also proposes an optimal operation strategy of the hot water set temperature for the two-pipe system. It is confirmed that the two-pipe system can provide sufficient heating energy and uses less energy compared to the four-pipe system.
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