COMPARATIVE ANALYSIS OF COMBINED THERMAL POWER AND REFRIGERATION SYSTEMS UTILIZING SOLAR ENERGY / OKEMENA JERRY ORUDE; SUPERVISOR: ASST. PROF. DR. ALI SHEFIK; CO-SUPERVISOR: ASST. PROF. DR. HUMPHREY ADUN

Yazar: Katkıda bulunan(lar):Dil: İngilizce 2022Tanım: x, 94 sheets; 31 cm. Includes CDİçerik türü:
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Konu(lar): Tez notu: Thesis (MSc) - Cyprus International University. Institute of Graduate Studies and Research Energy Systems Engineering Department Özet: ABSTRACT In the present study, 3 solar thermal powered electricity and cooling cogeneration systems are analysed and compared. The first system uses thermal energy from a parabolic trough collector (PTC) to generate electricity using an organic Rankine cycle (ORC) and portion of the produced power is used to provide cooling using a vapor compression refrigeration cycle. In the second cycle, the energy from the PTC is used to simultaneously generate electricity and provide cooling using a vapor ejector cogeneration cycle. In the third system, the energy from the PTC is used to simultaneously generate electricity and provide cooling using a vapor absorption cogeneration cycle. The 3 systems are analysed based on thermodynamic and exergy viewpoints. Energy, exergy, and exergy cost rates are calculated for all cycle streams. The results showed that system 2 has the highest energy efficiency of 16.33% compared to 14.47% for system 1, and 12.37% for system 3. Similarly, system 2 has the highest exergy efficiency of 63.54% compared to 56.29% for system 1, and 48.15% for system 3. From the exergoeconomic analysis, the total production unit cost is lowest in system 2 which has 73.02 $/GJ compared to 75.33 $/GJ in system 3, and system 1 has 291.7 $/GJ. From the exergoenvironmental analysis, system 2 has the highest amount of fuel and CO2 emission savings followed by system 1 and then system 3. The CO2 emission savings in system 2 is 198 tons/yr compared to 168 tons/yr in system 1, and 134 tons/yr in system 3. The exergoenvironmental impact factor and exergoenvironmental impact index also show that system 2 has the most suitable impact of the 3 systems. The 3 systems all reacted positively to an increase in solar radiation as more energy will be available to power each of the systems. However, for an increase in the cooling load, system 1 was negatively affected while system 2 and system 3 were positively affected. This shows that system 1 will have a better performance when it is predominantly used for power generation than for cooling. Overall system 2 was shown to have the best results of the 3 systems. Keywords: Cooling, Exergoeconomics, Exergoenvironmental, Exergy, Power, Solar thermal.
Materyal türü: Thesis
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Materyal türü Geçerli Kütüphane Koleksiyon Yer Numarası Durum Notlar İade tarihi Barkod Materyal Ayırtmaları
Thesis Thesis CIU LIBRARY Tez Koleksiyonu Tez Koleksiyonu YL 2814 O78 2022 (Rafa gözat(Aşağıda açılır)) Kullanılabilir Energy Systems Engineering Department T3153
Suppl. CD Suppl. CD CIU LIBRARY Görsel İşitsel YL 2814 O78 2022 (Rafa gözat(Aşağıda açılır)) Kullanılabilir Energy Systems Engineering Department CDT3153
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Thesis (MSc) - Cyprus International University. Institute of Graduate Studies and Research Energy Systems Engineering Department

Includes bibliography (sheets 84-94)

ABSTRACT
In the present study, 3 solar thermal powered electricity and cooling cogeneration
systems are analysed and compared. The first system uses thermal energy from a
parabolic trough collector (PTC) to generate electricity using an organic Rankine cycle
(ORC) and portion of the produced power is used to provide cooling using a vapor
compression refrigeration cycle. In the second cycle, the energy from the PTC is used
to simultaneously generate electricity and provide cooling using a vapor ejector
cogeneration cycle. In the third system, the energy from the PTC is used to
simultaneously generate electricity and provide cooling using a vapor absorption
cogeneration cycle.
The 3 systems are analysed based on thermodynamic and exergy viewpoints. Energy,
exergy, and exergy cost rates are calculated for all cycle streams. The results showed
that system 2 has the highest energy efficiency of 16.33% compared to 14.47% for
system 1, and 12.37% for system 3. Similarly, system 2 has the highest exergy
efficiency of 63.54% compared to 56.29% for system 1, and 48.15% for system 3.
From the exergoeconomic analysis, the total production unit cost is lowest in system
2 which has 73.02 $/GJ compared to 75.33 $/GJ in system 3, and system 1 has 291.7
$/GJ. From the exergoenvironmental analysis, system 2 has the highest amount of fuel
and CO2 emission savings followed by system 1 and then system 3. The CO2 emission
savings in system 2 is 198 tons/yr compared to 168 tons/yr in system 1, and 134 tons/yr
in system 3. The exergoenvironmental impact factor and exergoenvironmental impact
index also show that system 2 has the most suitable impact of the 3 systems.
The 3 systems all reacted positively to an increase in solar radiation as more energy
will be available to power each of the systems. However, for an increase in the cooling
load, system 1 was negatively affected while system 2 and system 3 were positively
affected. This shows that system 1 will have a better performance when it is
predominantly used for power generation than for cooling. Overall system 2 was
shown to have the best results of the 3 systems.
Keywords: Cooling, Exergoeconomics, Exergoenvironmental, Exergy, Power, Solar
thermal.

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