Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 210, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2020.112708
Keywords
District heating system; Distributed variable-speed pumps; Energy station location; Equipotential line method; Pipeline network
Categories
Funding
- National Key R&D Program of China - Research on Optimal Configuration and Demand Response of Energy Storage Technology in Nearly Zero Energy Community [2019YFE0193100]
- National Key R&D Program of China - Technical System and Key Technology Development of Nearly Zero Energy Building [2017YFC0702600]
- Qinghai building and materials research academy Co., Ltd [KLKF-2018-001]
- Key Lab of Plateau Building and Ecocommunity in Qinghai, China [KLKF-2018-001]
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The district heating system with distributed variable-frequency speed pumps (DVFSP) can provide substantial energy savings. Moreover, the energy station location has a great impact on the capital expenditure of heating system. Therefore, to determine the optimal energy station location in DVFSP system, this paper initially built a theoretical model of a DVFSP district heating system based on a cost-oriented index. Subsequently, an equipotential line method was illustrated and applied to a case study. This novel method can intuitively present the district distribution of the relative cost (RCnetwork) of DVFSP district heating system, which can conveniently determine the optimal location of an energy station. In the case study, six oval equipotential RCnetwork lines were described. The maximum RCnetwork reached 137.04% in the E4 location, and the minimum RCnetwork was 89.22% in the E11 location. The results showed that the optimal energy station location was near the district load center and biased to the side with higher building loads. Finally, a new energy utilization mode that coupled a combined cooling, heating and power (CCHP) system and a DVFSP district heating system was proposed. Economic analyses were carried out for the coupled system based on the following electric load (FEL) strategy and the following thermal load (FTL) strategy. The results confirmed that, in terms of the payback period and partial load rate (PLR) of the prime mover, the FEL strategy was more suitable for the coupled system. These results can provide guidance for district heating system design and management.
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