Naslov
Evaluation of integration of solar energy into the district heating system of the City of Velika Gorica

Autori
Andreu, Javier Felipe ; Schneider, Daniel Rolph ; Krajačić, Goran

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

Izvornik
Digital Proceedings of the 10th Conference on Sustainable Development of Energy, Water and Environment Systems - SDEWES / Ban, Marko .... [et al.] - Zagreb : International Centre for Sustainable Development of Energy, Water and Environment Systems (SDEWES), 2015

Skup
10th Conference on Sustainable Development of Energy, Water and Environment Systems – SDEWES Conference

Mjesto i datum
Dubrovnik, Hrvatska, 27.09.2015. - 02.10.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
District heating; solar energy; Photovoltaic-thermal collector; seasonal storage; solar water preheating

Sažetak
In the current situation the City of Velika Gorica (the “City”) faces several key issues regarding its thermal energy consumption. The thermal consumption in the City is 197.34 GWh where 20% is supplied by firewood, 2% by electricity, 15 % by fuel oil, 31% natural gas and 32% by the district heating system. In the district heating sector the main issue is the utilization of 14 small and distributed heat plants, each providing heat to a separate and individually disconnected heating grid. Of the fourteen installed plants only one is gas operated bearing 60.76% of the total installed capacity, while the rest use fuel oil resulting in a high level of CO2 emissions as well as the distribution losses due to a high-temperature district heating and an old distribution system. Other issues are the high thermal energy consumption of roughly 200 kWh/m2 in the residential sector and 190 kWh/m2 on average for public buildings. Reduction of costs and CO2 emissions can be reached with a high penetration of renewable sources and decreasing the energy consumption with better insulation. The aim of this paper is to evaluate the integration of solar energy into the district heating system of the City. There are three proposed scenarios for the use of solar energy in the City: (i) producing hot water for a residential-scale use ; (ii) preheating of a district heating plant ; and (iii) thermal energy storage in a solar plant for a district- scale use. In all aforesaid scenarios, the use of the new hybrid photovoltaic-thermal (PVT) collector has been evaluated. The future of the district heating system is concluded to be formed by the connection of the current fourteen small heating grids and operated by two heating plants, one solar plant and one biomass cogeneration plant. The system has been modeled as a low-temperature district heating system. The potential energy covered by solar is 40.4 GWh for hot water demand and 44 GWh for the district heating system.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA