Özet:
In first part of thesis, modular hybrid renewable energy systems (HRES) comprising of
biogas and solar photovoltaic (PV) are designed for various dairy cattle barns located
in Konya, Erzurum and İzmir provinces of Turkey. The design also included technical
and economic analyses. It is found that the grid-connected system including PV and
biomass are more feasible than the stand-alone biomass system in terms of net present
cost (NPC), return on investment (ROI), cost of energy (COE) and annual worth (AW).
Among the different regression models, ridge regression gives the highest coefficient of
determination (R2
) of 0.92, and the lowest root mean squared error (RMSE) value of
0.463 (million $). Consequently, it is found that total installed cost of solar energy has
the strongest effect on the share of electricity generation in terms of the effect on the
GDP, which is calculated as 97%.
In second part of thesis, a HRES composed of solar photovoltaic and biogas co-firing is
designed for a hazelnut cracking plant (HCP) in Ordu province of Turkey. Technical
and economic analysis are carried out based on the change in government incentives
on renewable sources before (Option A) and after 2021 (Option B) based on NPC and
COE. It is found that Option A has the lowest NPC and COE values, which are estimated
as 3.00 M USD and 0.098 USD/kW, respectively. In the sensitivity analysis of HRES
configuration, total NPC and COE values between nominal discount rate and biomass
price generally increase, while the values between expected inflation rate and sellback
rate are on a downward trend. Consequently, Scenario-4 has the lowest NPC and COE
values, and the highest renewable fraction (RF) at around 73.6%, whereas carbon
dioxide (CO2) and nitrogen oxides (NOx)emissions are lowest in Scenario-2.
