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Abstract: Combined heat and power (CHP) coal-fired plants and heat-only boilers are still working as main heat sources in North China. These provide high temperature water on the primary side of district heating (DH) systems. There can be large temperature differences between the primary side and secondary side deployed in low temperature district heating (LTDH) of buildings. In this paper, a LTDH system, integrated with an organic Rankine cycle (ORC) system, is presented and evaluated on how to utilize the limited temperature difference between the primary and secondary sides in a substation. Two cases are illustrated of the performance of two modes (series or parallel connection) and energy efficiencies of the configurations with or without an ORC system. The results showed that the integrated ORC system could provide sufficient power for the circulating pumps in the DH system. The integration of the ORC leads to only a very slight decrement on the supply water temperature. Generally, the series mode can generate the maximum output power from an integrated ORC system. The parallel mode showed more flexibility on the adjustment of output power from the ORC system, especially where domestic hot water is needed. When the cold tap water was used as a cooling stream in the condenser of an ORC system before preparing to be the domestic hot water, it is very helpful in improving the performance of the ORC and increasing the energy efficiency of the DH system.

采用有机朗肯循环的低温区域供热系统性能分析

[1]Abel E, 1994. Low-energy buildings. Energy and Buildings, 21(3):169-174.

[2]Antonio CS, Enrique RA, David BD, et al., 2016. District heating and cogeneration in the EU-28: current situation, potential and proposed energy strategy for its generalization. Renewable and Sustainable Energy Reviews, 62: 621-639.

[3]Baldvinsson I, Nakata T, 2016. A feasibility and performance assessment of a low temperature district heating system– a North Japanese case study. Energy, 95:155-174.

[4]Bao J, Zhao L, 2013. A review of working fluid and expander selections for organic Rankine cycle. Renewable and Sustainable Energy Reviews, 24:325-342.

[5]Brand M, Svendsen S, 2013. Renewable-based low-temperature district heating for existing buildings in various stages of refurbishment. Energy, 62:311-319.

[6]Brand M, Rosa AD, Svendsen S, 2014. Energy-efficient and cost-effective in-house substations bypass for improving thermal and DHW (domestic hot water) comfort in bathrooms in low-energy buildings supplied by low-temperature district heating. Energy, 67:256-267.

[7]Catto I, 2001. Carbon zero homes UK style. Renewable Energy Focus, 9(1):28-29.

[8]Chen X, Wang L, Tong L, et al., 2013. Energy saving and emission reduction of China’s urban district heating. Energy Policy, 55:677-682.

[9]Chwieduk D, 2001. Prospects for low energy buildings in Poland. Renewable Energy, 16(1-4):1196-1199.

[10]Colmenar-Santos A, Rosales-Asensio E, Borge-Diez D, et al., 2016. Evaluation of the cost of using power plant reject heat in low-temperature district heating and cooling networks. Applied Energy, 162:892-907.

[11]Deng G, 2013. The Effect of Occupant Behaviors on Evaluating Adaptability of Centralized Building Energy Saving Technologies. MS Thesis, Beijing University of Technology, Beijing, China (in Chinese).

[12]Elmegaard B, Ommen TS, Markussen M, et al., 2016. Integration of space heating and hot water supply in low temperature district heating. Energy and Buildings, 124: 255-264.

[13]Feng Y, Hung TC, Zhang Y, et al., 2015. Performance comparison of low-grade ORCs (organic Rankine cycles) using R245fa, pentane and their mixtures based on the thermo-economic multi-objective optimization and decision makings. Energy, 93:2018-2029.

[14]Hassine IB, Eicker U, 2013. Impact of load structure variation and solar thermal energy integration on an existing district heating network. Applied Thermal Engineering, 50(2):1437-1446.

[15]Holmgren K, 2006. Role of a district-heating network as a user of waste-heat supply from various sources–the case of Goteborg. Applied Energy, 83(12):1351-1367.

[16]Lecompte S, Huisseune H, van den Broek M, et al., 2015. Review of organic Rankine cycle (ORC) architectures for waste heat recovery. Renewable and Sustainable Energy Reviews, 47:448-461.

[17]Li Y, Xia J, Fang H, et al., 2016. Case study on industrial surplus heat of steel plants for district heating in Northern China. Energy, 102:397-405.

[18]Lund H, Möller B, Mathiesen BV, et al., 2010. The role of district heating in future renewable energy systems. Energy, 35(3):1381-1390.

[19]Lund H, Werner S, Wiltshire R, et al., 2014. 4th generation district heating integrating smart thermal grids into future sustainable energy systems. Energy, 68:1-11.

[20]Karlsson JF, Moshfegh B, 2007. A comprehensive investigation of a low-energy building in Sweden. Renewable Energy, 32(11):1830-1841.

[21]Köfinger M, Basciotti D, Schmidt RR, et al., 2016. Low temperature district heating in Austria: energetic, ecologic and economic comparison of four case studies. Energy, 110:95-104.

[22]MOHURD (Ministry of Housing and Urban-Rural Development of the People’s Republic of China), 2010. Design Code of City Heating Network, CJJ34-2010. MOHURD, China (in Chinese).

[23]Münster M, Morthorst PE, Larsen HV, et al., 2012. The role of district heating in the future Danish energy system. Energy, 48(1):47-55.

[24]Ommen T, Markussen WB, Elmegaard B, 2016. Lowering district heating temperatures–impact to system performance in current and future Danish energy scenarios. Energy, 94:273-291.

[25]Østergaard DS, Svendsen S, 2016. Replacing critical radiators to increase the potential to use low-temperature district heating–a case study of 4 Danish single-family houses from the 1930s. Energy, 110:75-84.

[26]Quoilin S, van den Broek M, Declaye S, et al., 2013. Techno-economic survey of Organic Rankine Cycle (ORC) systems. Renewable and Sustainable Energy Reviews, 22: 168-186.

[27]Saadatfar B, Fakhrai R, Fransson T, 2013. Waste heat recovery organic Rankine cycles in sustainable energy conversion: a state-of-the-art review. The Journal of Macro Trends in Energy and Sustainability, 1(1):161-188.

[28]Sartor K, Quoilin S, Dewallef P, 2014. Simulation and optimization of a CHP biomass plant and district heating network. Applied Energy, 130:474-483.

[29]Thomsen KE, Schultz JM, Poel B, 2005. Measured performance of 12 demonstration projects—IEA Task 13 ‘advanced solar low energy buildings’. Energy and Buildings, 37(2):111-119.

[30]Thyholt M, Hestnes AG, 2008. Heat supply to low-energy buildings in district heating areas: analyses of CO₂ emissions and electricity supply security. Energy and Buildings, 40(2):131-139.

[31]Tol Hİ, Svendsen S, 2015. Effects of boosting the supply temperature on pipe dimensions of low-energy district heating networks: a case study in Gladsaxe, Denmark. Energy and Buildings, 88:324-334.

[32]Wu Z, Pan D, Gao NP, et al., 2015. Experimental testing and numerical simulation of scroll expander in a small scale organic Rankine cycle system. Applied Thermal Engineering, 87:529-537.

[33]Xiong W, Wang Y, Mathiesen BV, et al., 2015. Heat roadmap China: new heat strategy to reduce energy consumption towards 2030. Energy, 81:274-285.

[34]Yang X, Li H, Svendsen S, 2016a. Decentralized substations for low-temperature district heating with no Legionella risk, and low return temperatures. Energy, 110:65-74.

[35]Yang X, Li H, Svendsen S, 2016b. Energy, economy and exergy evaluations of the solutions for supplying domestic hot water from low-temperature district heating in Denmark. Energy Conversion and Management, 122:142-152.

[36]Yang X, Li H, Svendsen S, 2016c. Evaluations of different domestic hot water preparing methods with ultra-low-temperature district heating. Energy, 109:248-259.

[37]Zhang L, Gudmundsson O, Thorsen JE, et al., 2016. Method for reducing excess heat supply experienced in typical Chinese district heating systems by achieving hydraulic balance and improving indoor air temperature control at the building level. Energy, 107:431-442.

[38]Zhu L, Hurt R, Correia D, et al., 2009a. Comprehensive energy and economic analyses on a zero energy house versus a conventional house. Energy, 34(9):1043-1053.

[39]Zhu L, Hurt R, Correia D, et al., 2009b. Detailed energy saving performance analyses on thermal mass walls demonstrated in a zero energy house. Energy and Buildings, 41(3):303-310.