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

Autori
Felipe Andreu ; Javier

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Escuela de Ingeniería y Arquitectura

Mjesto
Zaragoza

Datum
04.09

Godina
2015

Stranica
62

Mentor
Schneider, Daniel Rolph

Ključne riječi
Integration ; solar energy ; district heating

Sažetak
In the current situation the City of Velika Gorica (the “City”), located in Croatia, faces several key issues regarding its thermal energy consumption. The thermal consumption of its 31, 500 inhabitants is 197.34 GWh where 20% is supplied by firewood, 2% by electricity, 15 % by fuel oil, 31% by 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 project is to evaluate the integration of solar energy into the district heating system of the City. The first part of this project contains an analysis of the current situation in the City and a studio of the thermal and electricity needs of the City. Second, a studio of the available solar resources and possible technologies to use is presented (concentrating solar power, CSP, photovoltaic, PV, thermal, photovoltaic-thermal, PVT, seasonal thermal energy storage, STES, heat pumps, HP, and biomass boiler). Third, three proposed scenarios for the use of solar energy in the City have been analyzed: (i) producing domestic hot water, DHW, for a residential-scale use ; (ii) water preheating in a district heating plant ; and (iii) a Central Solar Heating Plant with Seasonal Storage for a district-scale use. In all aforesaid scenarios, an economic assessment is made. The potential energy savings in the production of domestic hot water with solar energy for buildings no connected to the district heating system, were 12.96 GWh in the entire City. Its production has been shown to be profitable and its solar heat cost was 0.0458 €/kWh, cheaper than the current production energy prices. The water preheating of a district heating plant has been shown to be feasible and its solar heat cost was 0.027 €/kWh, cheaper than the energy prices in the current production system. The solar heat cost of a solar heating plant with seasonal thermal storage has been shown to be lower than the current energy price in the district heating system, 55.8 €/MWh. A district heating system centralized is better than distributed, a low-temperature district heating system is better than a high-temperature district heating system and the feasible and profitable scenario of the solar introduction in the City were the main conclusions in this project.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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