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Öğe Biomass-fueled organic rankine cycles: state of the art and future trends(Multidisciplinary Digital Publishing Institute (MDPI), 2024) Heidarnejad, Parisa; Genceli, Hadi; Hashemian, Nasim; Asker, Mustafa; Al-Rawi, MohammadBiomass-fueled organic Rankine cycles (ORCs) are widely utilized technologies for power production because of their simplicity, low cost, and relatively high efficiencies. Furthermore, raw material availability and topographical independency make these systems preferable to other renewable-fueled power generation systems. A deep and comprehensive understanding of biomass-fueled organic Rankine cycles will provide researchers with a solid foundation to prioritize their investigations and assist future developments in this field. In this regard, feedstocks and their properties, biomass conversion mechanisms, and biomass-fueled power generation systems are discussed in this study. Power generation technologies based on coal and waste as feedstock have been widely investigated in the literature due to higher energy content and technological maturity. Additionally, depending on the type of biomass available, the scale of the power plant, and economic and environmental considerations, the most common technologies utilized for biomass conversion are combustion, gasification, and anaerobic digestion. Finally, the authors investigate various aspects of biomass-fueled organic Rankine cycles, including working fluids, analysis methods, and environmental issues. Since maximizing product yield is key in biomass-based power generation systems, technical assessment of these systems has been a primary focus of many studies. Further research is required on integrated environmental and socio-economic approaches, along with Machine Learning algorithms. Future advancements focusing on integration of feedstock with other renewable energy sources, efficient working fluids like nanofluids, and high-tech heat exchangers will drive the development of biomass-fueled ORC systems.Öğe Design of a cold storage with R507A refrigerant for the preservation of twenty-five tons of apples in the Ankara province(Istanbul Gedik University, 2023) Fenni, Berker Özün; Köse, Ali; Heidarnejad, ParisaIn the absence of proper humidity and temperature conditions, undried fresh foods will experience physiological and biological deterioration, resulting in mass loss and the development of mold. Thanks to this rationale, humanity has endeavored to keep food products from deteriorating. This can be observed through the use of cold rooms constructed by the Ancient Romans using clay and the cooling chambers known as "Yakhch?l" developed by the Persians. The advancement of refrigeration technology has persisted since the era of ancient civilizations. The advent of refrigeration cycles has significantly streamlined the implementation of containment technology. The presence of these systems in residential settings can be attributed to the development of the vapor compression refrigeration cycle and the compact nature of this technology, which enables convenient freezing or cooling of products for storage purposes. Vapor compression refrigeration cycles are still widely employed in various applications, such as office and automotive air conditioning systems, refrigerators, and industrial cold rooms. This study aims to develop an industrial cold room design tailored explicitly for storing and transporting apples, a perishable agricultural commodity. The primary objective is to ensure that the apples are maintained in optimal humidity and temperature conditions, thereby preventing any degradation, even when handling large quantities in Ankara.Öğe Dynamic simulation of the performance of a solar assisted heat pump in different climates(Istanbul Gedik University, 2024) Alipour, Bahareh; Karami, Maryam; Heidarnejad, ParisaOne method to reduce energy consumption in buildings is using solar assisted heat pumps, in which the combination of heat pump and solar collector is used to improve the thermal performance. In this paper, TRNSYS and EES software are used to simulate the performance of an indirect expansion solar assisted heat pump. Dynamic simulation of the system is performed by changing parameters such as mass flow rate of collector working fluid and the collector area in five climates including Hot/Dry, Cold/Dry, Moderate/Humid, Hot/semi-Humid, and Hot/Humid. The results show that, in January, the Cold/Dry climate had the lowest free energy ratio (FER) because of high space heating load. In this month, Hot/semi-Humid climate has the highest FER, because of the higher solar radiation and no need to space heating. The annual FER in Hot/Dry zone is 71% which is higher than that other zones. The lowest FER related to Moderate/Humid climate due to high humidity and cloudiness.Öğe The pandemic's sustainability windfall: a case study of COVID-19 restrictions on electricity demand patterns and sustainable development goals(Inderscience Enterprises Ltd, 2024) Heidarnejad, Parisa; Genceli, Hadi; Asker, Mustafa; Yumurtacı, ZehraIn this paper, the pattern of daily electricity demand mid- and post-pandemic eras relative to 2019 was investigated for Turkey and the total reduction of 9% in electricity demand from April to July 2020 in comparison to the same period in 2019 was monitored. Also, as a result of public behaviour changes, the electric demand of the service sector dropped by about 5.9%, 28.4%, 6.8%, and 5.8% during the first, second, third, and fourth quarters of 2020 in comparison to 2019. The electricity load was transferred from the service sector to the household sector in all four quarters of 2020. Eventually, the phasing out of measures on July 1, 2021, the electricity consumption of the service sector during the second half of the year improved to 31.11 TWh from 3.09 TWh during the same period in 2020. On the other hand, to comprehend the socio-economic effects of the pandemic, the variation of four indicators of sustainable development goals during the last 20 years was assessed and discussed for world, the UAS, OECD countries and Turkey.
