Gu Dungang, Huang Xionghu, Lu Jiaqi, Lou Yuhang, Li Guanghui, Zhang Nan
Petroleum and Chemical Industry Key Laboratory of Silicon Carbide Ceramic Membrane, School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, People's Republic of China.
Department of Chemical Engineering and Analytical Science, Centre for Process Integration, The University of Manchester, Manchester, UK.
Environ Technol. 2025 Mar;46(8):1292-1306. doi: 10.1080/09593330.2024.2382938. Epub 2024 Jul 30.
Heat pump can be used to recover abundant thermal energy contained in the discharge of municipal wastewater treatment plants. While there are some design standards for common heat pump systems, the design of a sewage source heat pump (SSHP) system is still often based on a fixed heat load and neglects the interdependencies between the equipment sizing and operating parameters. To address the issue that previous design methods have not balanced investment and operational costs well from a global optimisation perspective, this work formulates the simultaneous optimisation of SSHP design and operation as a non-linear programming problem. The proposed model features the consideration of multiple working conditions caused by the impact of ambient temperature variation on the heat load of the SSHP system. The feasibility and potential benefits of the optimised SSHP system are also evaluated by incorporating techno-economic performances and environmental impact analyses into the mathematical framework. A case study is carried out to demonstrate the effectiveness of the proposed methodology. The results show that the total annual cost of the optimally designed and operated SSHP in Harbin could be 9% lower than in Beijing and 39% lower than in Shanghai, suggesting that constructing and running the SSHP system in severe cold regions with great heating demands might be more economical than in less cold regions. The CO, SO, and NO emissions of the SSHP could be approximately 50% less than that of coal-fired boiler heating, and 80% less than that of direct electric heating with coal-fired electricity.
热泵可用于回收城市污水处理厂排放物中所含的大量热能。虽然普通热泵系统有一些设计标准，但污水源热泵（SSHP）系统的设计通常仍基于固定热负荷，而忽略了设备尺寸和运行参数之间的相互依存关系。为了解决以往设计方法从全局优化角度未能很好地平衡投资和运营成本这一问题，本研究将SSHP设计与运行的同步优化表述为一个非线性规划问题。所提出的模型考虑了环境温度变化对SSHP系统热负荷的影响所导致的多种工况。通过将技术经济性能和环境影响分析纳入数学框架，还评估了优化后的SSHP系统的可行性和潜在效益。进行了案例研究以证明所提方法的有效性。结果表明，在哈尔滨，优化设计和运行的SSHP的年总成本可能比北京低9%，比上海低39%，这表明在供热需求大的严寒地区建设和运行SSHP系统可能比在寒冷程度较低的地区更经济。SSHP的CO、SO和NO排放量可能比燃煤锅炉供热少约50%，比以煤电进行直接电加热少80%。
