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CLC number: TU995.3

On-line Access: 2018-06-04

Received: 2017-02-28

Revision Accepted: 2018-01-25

Crosschecked: 2018-05-11

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Citations:  Bibtex RefMan EndNote GB/T7714


Hai-ying Wang


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Journal of Zhejiang University SCIENCE A 2018 Vol.19 No.6 P.461-478


Evaluation on energy performance in a low temperature district heating system integrated with organic Rankine cycle

Author(s):  Hai Wang, Hai-ying Wang, Tong Zhu, Nai-ping Gao

Affiliation(s):  School of Mechanical Engineering, Tongji University, Shanghai 200092, China

Corresponding email(s):   haiyingw@tongji.edu.cn

Key Words:  District heating, Low temperature district heating (LTDH), Organic Rankine cycle (ORC), Energy evaluation, Pipe network

Hai Wang, Hai-ying Wang, Tong Zhu, Nai-ping Gao. Evaluation on energy performance in a low temperature district heating system integrated with organic Rankine cycle[J]. Journal of Zhejiang University Science A, 2018, 19(6): 461-478.

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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.


目的:在中国北方,需要采用更多的低温区域供热系统来适应节能型建筑的低能耗状况,而传统高温热源和低能耗建筑之间存在较大的能量品质差异. 本文旨在研究一种新能源梯级利用系统,充分利用这一能量差异,并减少供热管网的热损失.
创新点:1. 提出一种有机朗肯循环(ORC)与低温区域供热整合的系统,由有机朗肯循环提供水泵动力; 2. 建立系统模型,模拟不同连接方式下系统的供热性能和节能效果.
方法:1. 通过理论建模,构建有机朗肯循环、热力站换热器及循环水泵之间的能量转换关系; 2. 通过案例分析,比较换热器与ORC设备串联或并联两种供水和回水的组织方式的供热性能与节能性能.
结论:1. 对于低温区域供热系统,一次侧供水温度在110~150 °C,二次侧回水温度为30 °C或更低温度时,可在热力站内整合ORC设备. 2. ORC设备输出功对供热的不利影响很小,ORC设备可产生足够的动力满足热力站内水泵的能耗. 3. ORC与热力站换热器间可采用串联或并联的连接方式; 对于热力站内水泵能耗大的场合,可采用串联方式,ORC设备可最大限度地利用两侧温差; 采用并联方式时,ORC设备只与一部分一次侧供水和部分二次侧回水进行换热,并联设备之间的热力工况相互影响小.


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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