Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
An entransy dissipation-based method for global optimization of district heating networks
Highlights ► A global optimization method for district heating networks (DHNs) is developed. ► The relation between users’ demands and the design parameters is established. ► An optimization equation group for DHNs is derived theoretically. ► Solving these equations offers the optimal design parameters of DHNs. ► The method is applied in the optimization of two typical district heating networks.
Abstract Improving the heating performance of district heating networks (DHNs), one of the most important components in district heating systems, has significant influence on the promotion of energy efficiency. Based on the entransy theory, this paper develops an entransy dissipation-based method for global optimization of DHNs. We analyze the irreversibility of three types of heat transfer processes in DHNs: (1) the heat transfer process between the waters in primary heating networks and DHNs in substation heat exchangers; (2) the heat transfer process between supply water and indoor airs in radiators; and (3) the return water mixing process, then derive the expressions of entransy dissipation for each process, and finally deduce two different formulas of the total entransy dissipation in DHNs by the users’ demands and the structural and operating parameters of DHNs, respectively, from which we establish the mathematical relation between the users’ demands and the structural and operating parameters of DHNs. Based on this relation, two typical optimization problems of DHNs are converted into conditional extremum problems to deduce two optimization equation groups. Solving the equation groups gives the optimal structural and operating parameters for DHNs with highest energy efficiency. Finally, the method is proved valid and advantageous through the optimization for both 1-column-2-user and 2-column-4-user DHNs.
An entransy dissipation-based method for global optimization of district heating networks
Highlights ► A global optimization method for district heating networks (DHNs) is developed. ► The relation between users’ demands and the design parameters is established. ► An optimization equation group for DHNs is derived theoretically. ► Solving these equations offers the optimal design parameters of DHNs. ► The method is applied in the optimization of two typical district heating networks.
Abstract Improving the heating performance of district heating networks (DHNs), one of the most important components in district heating systems, has significant influence on the promotion of energy efficiency. Based on the entransy theory, this paper develops an entransy dissipation-based method for global optimization of DHNs. We analyze the irreversibility of three types of heat transfer processes in DHNs: (1) the heat transfer process between the waters in primary heating networks and DHNs in substation heat exchangers; (2) the heat transfer process between supply water and indoor airs in radiators; and (3) the return water mixing process, then derive the expressions of entransy dissipation for each process, and finally deduce two different formulas of the total entransy dissipation in DHNs by the users’ demands and the structural and operating parameters of DHNs, respectively, from which we establish the mathematical relation between the users’ demands and the structural and operating parameters of DHNs. Based on this relation, two typical optimization problems of DHNs are converted into conditional extremum problems to deduce two optimization equation groups. Solving the equation groups gives the optimal structural and operating parameters for DHNs with highest energy efficiency. Finally, the method is proved valid and advantageous through the optimization for both 1-column-2-user and 2-column-4-user DHNs.
An entransy dissipation-based method for global optimization of district heating networks
Xu, Yun-Chao (Autor:in) / Chen, Qun (Autor:in)
Energy and Buildings ; 48 ; 50-60
08.01.2012
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
An entransy dissipation-based method for global optimization of district heating networks
| Online Contents | 2012
An entransy dissipation-based method for global optimization of district heating networks
| Online Contents | 2011
| British Library Online Contents | 2013