Naslov
Hourly multi-objective optimization of district heating and cooling systems for a one-year time horizon

Autori
Dorotić, Hrvoje ; Pukšec, Tomislav

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Digital Proceedings of the 3rd South East European Conference on Sustainable Development of Energy, Water and Environment Systems / Ban, Marko - , 2018

Skup
3rd South East European Conference on Sustainable Development of Energy, Water and Environment System Conference (SEE SDEWES 2018)

Mjesto i datum
Novi Sad, Srbija, 30.06.2018. - 04.07.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
District heating and cooling ; multi-objective optimization ; mixed integer linear programming ; thermal storage ; Pareto front

Sažetak
Besides lowering supply temperatures, the concept of the Fourth generation of district heating (4DH) also includes integration of heating, cooling and power sector. Due to their high interconnectivity, number of involved technologies and relatively long, but at the same time detailed, time scale, optimization of such system presents a challenging task. So far, only hourly district heating multi- objective optimization for a whole year period has been carried out, where detailed district heating and cooling multi-objective optimization has been reserved only for small scale utilization and short temporal scale, usually covering specific days or weeks. The main objective of this paper was a development of hourly based multi-objective optimization model which is capable of defining supply capacities, including thermal storage size, and their operation for a whole year period. The objective functions are minimization of a total system cost, which includes discounted investment and operational costs, and minimization of environmental impact in terms of early carbon dioxide emissions. In order to deal with multi-objective optimization, weighted sum and epsilon constraint methods were used. The model is able to choose between different supply technologies such as: heat- only boiler, electrical heater, compression and absorption heat pumps, cogeneration, solar thermal and daily, i.e. seasonal thermal storage. In addition to this, the result is the optimal level of integration of heating, cooling and power sector through utilization of absorption and compression heat pumps and cogeneration. Besides presenting obvious benefits of heating and cooling integration in terms of smaller greenhouse gasses emissions, investment and operational cost, this paper defines configuration and technology in order to satisfy boundary conditions put on economic feasibility and environmental impact of the system. These two criteria are usually in contradiction but when integrating heating and cooling sector through 4DH systems this potentially won’t be the case. By using multi- objective optimization, this paper confirmed that for equal level of carbon dioxide emission, combined district heating and cooling systems have lower total discounted cost when compared to the district heating and cooling systems which operate separately.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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