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Comparison of two schemes for district cooling system utilizing cold energy of liquefied natural gas

Journal of Southeast University(English Edition) 2010年第2期26卷 316-319页

作者：王弢林文胜顾安忠上海交通大学制冷与低温工程研究所上海200240

Two schemes（scheme Ⅰ and scheme Ⅱ）for designing a district cooling system（DCS）utilizing cold energy of liquefied natural gas（LNG）are *** scheme Ⅰ,LNG cold energy is used to produce ice,and then ice is transported to the central cooling plant of the *** scheme Ⅱ,return water from the DCS is directly chilled by LNG cold energy,and the chilled water is then sent back to the central *** heat transportation loss is the main negative impact in the DCS and is emphatically analyzed when evaluating the efficiency of each *** results show that the DCS utilizing LNG cold energy is feasible and *** cooling supply distance of scheme Ⅱ is limited within 13 km while scheme Ⅰ has no distance *** the distance is between 6 and 13 km,scheme Ⅱ is more practical and ***,scheme Ⅰ has a better economic performance when the distance is shorter than 6 km or longer than 13 km.

关键词： district cooling system liquefied natural gas(LNG) cold energy utilization system efficiency

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Time-efficient Strategic Power Dispatch for district cooling systems Considering Evolution of cooling Load Uncertainties

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CSEE Journal of Power and Energy systems 2022年第5期8卷 1457-1467页

作者： Ge Chen Biao Yan Hongcai Zhang Dongdong Zhang Yonghua Song State Key Laboratory of Internet of Things for Smart City and Department of Electrical and Computer Engineering University of MacaoMacao 999078China

district cooling system(DCS)provides centralized chilled water to multiple buildings for air conditioning with high energy-efficiency and operational *** is one of the most popular cooling systems for large buildings in modern cities and an important demand response source for power *** order to enhance its energy efficiency and utilize its flexibility,strategic operation is ***,finding an optimal policy for DCS operation is a challenging task because of the high inter-connectivity among *** evolution of cooling load uncertainties further increases the *** paper addresses the aforementioned challenges by proposing a novel optimal power dispatch model for *** proposed model optimizes water temperature and mass flow rates simultaneously to improve the energy efficiency as much as *** also explicitly describes the uncertainty accumulation and ***-constrained programming is employed to guarantee the cooling service *** further propose a more timeefficient formulation to overcome the computational intractability caused by the non-smooth and non-convex *** experiments based on a real DCS confirm that a time-efficient formulation can save about half of solution time with negligible cost increase.

关键词： district cooling system HVAC cooling power dispatch demand-side flexibility chance-constrained programming

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