Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(115)
- Kaya, Yunus(50)
- Ayata, Ümit(48)
- Şahin, Engin(48)
- İspirli, Hümeyra(46)
- Bayraktar, Bülent(42)
- Şenay, Volkan(41)
- Can, Zehra(39)
- Özen, Soner(37)
- Bayram, Sinan(35)
- Pat, Suat(35)
- Öztürk, Mesut(35)
- Ecem Bayram, Nesrin(34)
- Esmer, Yusuf(34)
- Battal, Fetullah(33)
- Artar, Musa(32)
- Öner, Erdal(32)
- Korkmaz, Şadan(31)
- Yilmaz, Mustafa Tahsin(31)
- Ertugrul, Mehmet(30)
- Mercan, Emin(30)
- Hasar, Ugur Cem(29)
- Kutlu, Naciye(28)
- Özdemir, Akın(27)
- Kul, Murat(26)
- Cuce, Erdem(25)
- Kamiloğlu, Aybike(25)
- Bayram, Ozkan(24)
- Sefali, Abdurrahman(24)
- Sert, Durmuş(24)
- Çolak, Murat(24)
- Ayazoglu, Rabil(22)
- Gıdık, Betül(22)
- Maden, Sedat(22)
- Ustabulut, Mete Yusuf(22)
- Uçurum, Metin(22)
- Akeren, Zahide(21)
- Dirican, Ebubekir(21)
- Kara, Yakup(21)
- Abdioglu, Murat(20)
Yayınlar
- MakaleYalnız künye2018Scopus SJRQ2Levitation and guidance force relaxations of the single−seeded and multi−seeded YBCO superconductors
Abdioglu, M.; Ozturk, K.; Kabaer, M.; Ekici, M.
The stable levitation and guidance forces at higher force levels are important parameters for technological applicability of high temperature superconductors (HTSs) in Maglev and Flywheel energy storage systems. In this study, we have investigated the levitation and guidance force relaxation of both the single-seeded and multi-seeded YBCOs for different (HTS)−permanent magnetic guideway (PMG) arrangements in different cooling heights (CH). The measured saturated force values of Halbach PMG arrangements are bigger than the maximum force values of other PMGs. It is determined that the normalized magnetic levitation force (MLF) and normalized guidance force (GF) relaxation rate values decrease while the relaxation rates increase with increasing magnetic pole number and the effective external magnetic field area for both the single−seeded and multi−seeded YBCO. Also it can be said that the force stability at the higher force value of Halbach PMG arrangement indicates that the relaxation quality of Halbach PMG is better than that of the others. Additionally, it can be said that both the MLF and GF relaxation qualities of the multi−seeded YBCOs are better than that of the single−seeded ones. This magnetic force and relaxation results of the single−seeded and multi−seeded YBCOs are useful to optimize the loading capacity and lateral reliability of HTS Maglev and similar magnetic bearing systems.
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İncele - MakaleAçık Erişim2018Scopus SJRQ2Effect of the number of cycles on the optical and structural properties of Mn3O4 nanostructures obtained by SILAR technique
Bayram, Ozkan; Simsek, Onder; Guney, Harun; Igman, Erdal; Murat Ozer, Mustafa
In this study, nanostructured Mn3O4 (manganese oxide) thin films were successfully obtained by successive ionic layer adsorption and reaction (SILAR) method on the soda lime glass substrates using Manganese Nitrate (Mn(NO3)2) and Ammonium hydroxide (NH4(OH)) as cationic and anionic precursors respectively. Structural and morphological characterizations of the Mn3O4 films obtained at different cycles were determined using X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The crystal structure of the thin films were also confirmed by RAMAN spectroscopy. Optical properties such as absorption, transmission, reflection, extinction coefficient and optical band gap of nanostructured Mn3O4 thin films were determined by UV–Vis spectroscopy. SEM images showed that the manganese oxide nanosheets formed uniformly on substrate surface. As the deposition cycles increased, nano-sheets structure deteriorated. The optical band gap of Mn3O4 thin films varied from 2.12 to 2.59 eV, depending on the increase in number of cycles. From contact angle measurements of thin films, it was determined that thin films had hydrophilic character.
AtıfScopus14WoS14OpenAlex16İncele - MakaleYalnız künye2018Scopus SJRQ1Thermoeconomic analysis and optimization of a Re-compression supercritical CO2 cycle using waste heat of Gaziantep Municipal Solid Waste Power Plant
Tozlu, Alperen; Abuşoğlu, Ayşegül; Özahi, Emrah
This paper presents thermodynamic and thermoeconomic analyses as well as optimization of a re-compression supercritical CO2 cycle. A gas turbine cycle (GT) is adapted as a model to an existing plant to generate additional power in Gaziantep Municipal Solid Waste Power Plant (GMSWPP). The total capital cost rate and total cost rate of the GT cycle are found to be 20.47 $/h and 77.14 $/h, respectively utilizing SPECO by using the exhaust gas of 16 kg/s with 1.9 bar and 566.7 °c. The net power, the energy and exergy efficiencies, the total cost and the total capital cost rates of the GT cycle are optimized by +1.73%, +3.21%, +2.45%, −1.11% and −1.64%, respectively using NSGA-II in MATLAB in the range of 2.5≤PR≤4, 200≤P6≤216, 16≤T0≤23 and 9.1≤LMTD≤12.9. This paper provides an originality such that optimization as well as thermodynamic and thermoeconomic analyses is performed simultaneously for an existing MSW power plant, which can be stressed that there are scarce amounts of studies related on this field. Moreover, as another novelty, it can be emphasized that net power output of such like plants which have similar capacity can be improved using the developed model and NSGA-II optimization method.
AtıfScopus47WoS43OpenAlex48İncele - MakaleYalnız künye2018Scopus SJRQ1Determination of powder flow properties of skim milk powder produced from high-pressure homogenization treated milk concentrates during storage
Mercan, Emin; Sert, Durmuş; Akın, Nihat
The aim of this study was to determine effects of high-pressure homogenization (HPH) treatment to milk concentrates on powder flow properties of skim milk powders (SMP). For this purpose, SMP samples were produced from skim milk concentrates which were HPH treated at 0 (control), 50, 100 and 150 MPa. SMP samples were stored 180 days at 20 and 40 °C and caking, cohesion and powder flow speed dependency test (PFSD) were performed using a Powder Flow Analyzer. HPH treatment decreased cohesion and caking properties of SMPs. At the 0. day, cake strength of SMPs from HPH treated concentrates varied from 0.43-2.70 mN.m, whereas cake strength of SMP-0 (control) was 8.20 mN.m. Cohesion index (CI) of samples ranged from 6.80-15.74 mm during storage. Based on CI, SMPs from HPH treated concentrates showed free and easy flowing flow behavior during storage at 20 and 40 °C. In addition, cohesion index at four speeds indicated that SMP from HPH treated concentrates were more flowable at even lower flow speeds then SMP-0. PFSD test verified that all SMP samples showed more free-flowing characteristics with increasing flow speeds. Flow stability of samples ranged from 0.95-1.15 and also flow stability of SMP-0 increased during storage at both 20 and 40 °C. The results revealed that HPH treatment to milk concentrates could improve powder flow properties of skim milk powders.
AtıfScopus47WoS41OpenAlex51İncele - MakaleAçık Erişim2018Primary school teachers' practices and troubles with the students who they think have undiagnosed difficulties in verbal communication, reading and writing
Ergen, Yusuf; Elma, Cevat
The primary school Turkish program was basically built on three learning domains. These are the learning domains of verbal communication, reading and writing. The purpose of the present study is to determine primary school teachers’ practices and difficulties related to students considered to have undiognosed verbal communication, reading and writing difficulties. The study used the phenomenological research design, one of the qualitative research designs. The sample of the study was composed of a total of 21 primary school teachers servicing in the province of Bayburt during the 2016-2017 educational year. The sample of the study was determined by using the maximum variation sampling method, one of the purposeful sampling methods. The study data was collected through using the semi-structured interview form. In the analysis of the data, the content analysis method was used. Based on the study results, it was concluded that the primary school teachers more frequently carried out the practices of 'speaking in front the class about daily events' for the students having speaking difficulties, 'using the smart board' for the students with listening difficulties, 'one-to-one reading with the teacher' for the students with reading difficulties and 'one-to-one dictation work' for the students with writing difficulties; they more frequently had problems related to the 'timid behaviors' of the students with speaking difficulties, 'losing attention' of the students with listening difficulties and the 'poor time management skills' of the students with reading and writing difficulties; they also expected help from families in all the learning domains.
AtıfScopus2OpenAlex2İncele - MakaleYalnız künye2018Scopus SJRQ2The interactions of cephalosporins on polyol pathway enzymes from sheep kidney
Şengül, Bülent; Beydemir, Şükrü
Context: Cephalosporins are derived from the fungus Acremonium. Due to their strong bactericidal ability, these drugs have to a wide usage in medicine. Objective: An investigation of the effects on sheep renal aldose reductase (AR) and sorbitol dehydrogenase (SDH) of cefoperazone, cefazolin, cefuroxime, ceftazidime and ceftriaxone as cephalosporin drugs was carried out in the present study. Methods: AR and SDH were purified from sheep kidney by ion exchange, gel filtration and affinity methods with approximately 219- and 484-fold, respectively. Some kinetic properties of the enzymes were determined such as optimal pH, optimal ionic strength, optimal temperature, stable pH, Km and Vmax. IC50 values of the drugs were found for each enzyme. Results: While the AR was inhibited by all drugs, SDH enzyme was inhibited by only CXM (IC50 8.10 mM). Interestingly, CZO activated SDH enzyme. This result was evaluated as important for the flow of the polyol reactions. Ki values and inhibition types were determined for AR. However, these values could not have determined for SDH, due to insufficient inhibition. Conclusions: From these results, it was concluded that cephalosporins may have an important effect on flow of the polyol metabolism.
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İncele - MakaleAçık Erişim2018Scopus SJRQ3The anti-genotoxic effect of some lichenic acids
Kizil, Hamit Emre; Ceker, Selcuk; Capik, Ozel; Agar, Guleray
Four lichen secondary metabolites; diffractaic acid, lecanoric acid, lobaric acid and vulpinic acid were evaluated for the anti-genotoxic effects on human lymphocytes in vitro using single cell gel electrophoresis (SCGE) or comet assay. Carbon tetrachloride, a known mutagenic agent was used as the positive control in the comet test system. The results revealed that at all concentrations, the tested compounds mediated a significant decrease in total DNA damage (comet assay) as compared with positive controls (p > 0.05). The most effective doses of lichen acids were found to be 100 μgmL-1 of diffractic acid, lobaric acid and vulpinic acid, and 50 μgmL-1 of lecanoric acid. In addition, it was determined that the most effective among the tested compounds was vulpinic acid.
AtıfScopus4WoS2OpenAlex2İncele - MakaleAçık Erişim2018Scopus SJRQ2Chemical characterization of 64 propolis samples from hakkari, Turkey
Bayram, Nesrin Ecem; Sorkun, Kadriye; Öz, Gül Cevahir; Salih, Bekir; Topçu, Gülaçtı
Propolis is a resinous substance produced by honey bees from various plants they visit. Sixty-four propolis samples were collected from different localities of four districts (Merkez, Yüksekova, Şemdinli, and Çukurca) in Hakkari territory. Ethanol extracts of the propolis samples were prepared, and their chemical contents were determined by gas chromatography–mass spectroscopy (GC–MS). Flavonoids were generally found in a high concentration in Şemdinli samples of Turkey. Twenty-seven coumarins were identified in the 28 propolis samples among studied 64 ones. Except suberosin, the coumarins were never reported before in any propolis sample with Turkish origin. The propolis samples belonging to Yüksekova were found to be richer in coumarins than the others, and the most richest one among the Yüksekova apiaries, was found to be Akocak sample (Y2) with 41.99% total yield, followed by Akçalı sample (Y5) (30.86%). This is a first comprehensive and original report about the chemical profile of propolis samples from Hakkari. The propolis samples from Hakkari exhibited a chemical content rich in flavonoids including coumarins and furocoumarins.
AtıfScopus16WoS14OpenAlex23İncele - MakaleAçık Erişim2018Scopus SJRQ1A novel strategy for probiotic bacteria: Ensuring microbial stability of fish fillets using characterized probiotic bacteria-loaded nanofibers
Ceylan, Zafer; Meral, Raciye; Karakaş, Canan Yağmur; Dertli, Enes; Yilmaz, Mustafa Tahsin
Nanoencapsulation of probiotic bacteria (L. rhamnosus) into poly(vinyl alcohol) & sodium alginate-based nanofibers (VSPBe) and also the production of poly(vinyl alcohol) & sodium alginate-based nanofibers (VS) were successfully obtained. VSPBe and VS nanofibers were used to limit the Total Mesophilic Aerobic Bacteria (TMABc), Psychrophilic Bacteria (TPBc) and also Yeast and Mold count (TYMc) growth in the fish fillet. Dispersion stability (ζ potential −6.29 mV and −7.74 mV, for VS and VSPBe, respectively), thermal decomposition (a reduction in mass of VS and VSPBe at temperatures 50 °C, corresponding to <5% and >5%, respectively) and morphological properties of nanofibers (diameters between 60 nm and 580 nm) were revealed by characterization analysis. Microbiological tests demonstrated that VS and VSPBe were effectively delayed the TMABc and TPBc growth in fish fillets up to 38%. However, the antimicrobial effects of nanofibers were not pronounced for TYM growth in the fish fillet. The viability of probiotic bacteria could be provided after electrospinning process and the use of L. rhamnosus-loaded nanofibers for delaying microbial growth in the fish fillets could be evaluated as a natural/novel technique.
AtıfScopus108WoS95OpenAlex108İncele - MakaleAçık Erişim2018Scopus SJRQ2A study on the optical, chemical and dielectric properties of PPCIN thin films derived from essential oil compounds using RF plasma polymerisation technique
Bayram, Ozkan; Simsek, Onder
Polymer-based nanostructured films were produced on various substrates using Radio Frequency (RF) plasma polymerization technique from Cinnamaldehyde monomer which is an organic compound. To fabricate polymer thin film, the pressure, the deposition time and RF power were set to 480 mTorr, 30 min and 15, 20 and 30 W, respectively. The effect of RF power on the optical, morphological and chemical properties of thin films were investigated. The optical, morphological and chemical properties were determined by UV–Vis spectroscopy, Atomic Force Microscopy (AFM) and FTIR spectroscopy, respectively. The average surface roughness of thin films was detected as 5.7 nm, 3.9 nm and 11.7 nm using AFM depending on the increase in RF power. Using FTIR spectroscopy, the chemical structure of the polymer thin films was compared with that of the monomer material, and it was found that the majority of the functional groups belonging to the monomers also appeared in the thin films. Optical band gap of thin films increased with RF power and these values were determined as 2.83 eV, 3.05 eV and 2.98 eV, respectively. The extinction coefficients and refractive indices of the thin films were measured at 500 nm between 0.00183–0.00522 and 2.40–2.78, respectively.
AtıfScopus14WoS14OpenAlex16İncele - MakaleYalnız künye2018Scopus SJRQ2Determination of the optical and chemical properties of aniline doped plasma polymerized cineole thin films synthesized at various RF powers
Bayram, Ozkan
Aniline-doped plasma polymerized cineole (PPCin) thin films were produced on glass substrates by plasma polymerization technique under varying Radio Frequency (RF) power levels. PPCin thin films were produced at 30 min deposition time and at 50, 75 and 100 W RF energies. Surface morphologies of pure and aniline-doped PPCin thin films obtained on glass substrates were investigated by AFM. It was found that the average surface roughness of pure PPCin thin films increased from 0.19 to 30.6 nm due to the dopant effect and RF energies. The optical band gap for pure polymer thin film was 3.65 eV, but with the effect of doping, these value was found to be 3.54, 3.29 and 3.93, respectively, with increasing RF energy. The extinction coefficient and refractive indices of PPCin thin films were calculated as between 0.065 and 0.92 and between 1.24 and 1.57 respectively, at the wavelength of 400 nm. Wettability analyzes of PPCin thin films were also determined using the water contact angle (WCA) measurement and all thin films were found to have hydrophilic character.
AtıfScopus8WoS7OpenAlex9İncele - MakaleYalnız künye2018Scopus SJRQ3DIFFERENT LAND USE INFLUENCES ON AMINO ACID, ORGANIC ACID, HORMONE AND MINERAL NUTRIENT CONTENTS OF DRY BEANS
Erdogan, Ummugulsum; Kitir, Nurgul; Günes, Adem; Tuan, Metin; Tasci, Sinem; Yildirim, Ertan; Karaman, Mehmet Rustu; Mokhtari, Negar Ebrahim Pour; Ozlu, Ekrem; Firildak, Gulay
Dry bean (Phaseolus vulgaris L.) is a widely grown and important food legume which is a major source of mineral nutrition. The present study digs in determining differences in nutrients, organic-amino acid and hormone concentrations of Ispir bean genotypes under different land use conditions. The study sites (32 locations) were identified according to the stratified sampling method in the Ispir district, Erzurum, Turkey, under consideration of bean-cultivated lands and the number of villages. The seed weights were higher for genotype no. 4 (137.5 g) than for genotype no. 14 (131.5 g) and following by all other genotypes. Moreover, values for crude protein content were significantly higher for genotype no. 14 (263.1 g/kg) in comparison to genotype no. 4 (256.9 g/kg) and other genotypes. Therefore, it is concluded that land use impacts seed weight, nutrient, crude protein, amino acid, organic acid and hormone contents of Ispir dry bean. Land use can result economic improvements in crop yields and yield components. Dry bean seed weights were impacted by other crop yield components such as amino acid, organic acid and hormone contents of dry bean.
- MakaleAçık Erişim2017The Effect of Wrestling Training and Sauna Practice on Cortisol and Insulin Hormones
Aggon, E; Kiyici, F; Ucan, I; Colak, M; Agirbas, O; Hackney, AC
AtıfOpenAlex1İncele - MakaleAçık Erişim2017Bağdad’da İlhanlı Dönemi İdarecileri (1258-1280)
Dayı, Özkan
İlhanlılar hâkim oldukları coğrafyalarda özellikle uyguladıkları yeni idari sistemlerle dikkat çekmektedirler. Bu yeni dönem tüm ülkede kuruluş aşamasında kendini daha çok hissettirmekteydi. Bu bağlamda Moğollar tarafından zapt edilen yeni bölgelere yapılan atamalar ile yöneticiler yoğun bir faaliyet içerisine girmişlerdir. Bu yeni idari kadro istilanın getirdiği yıkıcı sonuçları ortadan kaldırmak için büyük bir çaba sarf etmiştir. Bu dönemin bürokratları; gerek merkezi teşkilat içerisinde olsun, gerek taşra mekanizmasında olsun büyük yıkımın etkilerini ortadan kaldırmak ve ekonomik canlılığı yeniden sağlamak için uğraşmışlardır. Bu doğrultuda İlhanlı ülkesinin her yerine atanan idari kadrolar gibi Bağdad’a atanan yetkililerin de faaliyetleri reform niteliğinde- dir. Zira Bağdad 1258 tarihinde büyük bir felakete uğramıştı. Şehri yeniden mamur ve bayındır hale getirmek ise, istila sonrasında İlhanlı merkezinden şehre atanan kadroların en büyük ve sorunlu vazifesi haline gelmişti. Bu sebeple çalışmamızda, dönem içerisinde Bağdad şehrine tayin edilen devlet adamlarının siyasi faaliyetlerine ve çalışmalarına değinmeye çalışacağız.
AtıfOpenAlex1TR Dizin2
İncele - MakaleYalnız künye2017Terör Olaylarının Finansal Piyasalar Üzerine Etkisi
Korkmaz, Özge; Erer, Elif; Erer, Deniz
Bu çalışmada, Türkiye'de meydana gelen terör olaylarının İstanbul Altın Borsası, BIST100 ve alt sektör endeks getirileri üzerindeki oynaklık etkisi incelenmiştir. Çalışmada, negatif ve pozitif olayların oynaklık üzerindeki etkilerinin farklı olması nedeniyle EGARCH ve GJR-GARCH modelleri kullanılmıştır. Çalışmanın sonucunda, Türkiye'de yaşanan terör olaylarının BIST 100, alt sektör ve İstanbul Altın Borsası endeks oynaklığı üzerinde istatistiksel olarak anlamlı bir etkiye sahip olmadığı görülmüştür. Ayrıca altın, hizmet ve teknoloji sektör endekslerinin sadece pozitif yönlü; sınai ve mali sektör endekslerinin ise hem negatif hem de pozitif yönlü haberlerden etkilendiği tespit edilmiştir
AtıfTR Dizin5İncele - MakaleYalnız künye2017Manufacture of fired clay bricks containing an industrial waste (bottom ash)
Gökçe, Mehmedi Vehbi; Uçurum, Metin; Bilgil, Ahmet; Yeşilyurt, Ergün; Fener, Mustafa
Bottom ash is an industrial waste produced by the combustion of coal in industrial plants. These wastes are still under discussion as an environmental issue because of the very restricted field of use. Therefore, numerous studies have been getting performed to reduce the amount of wastes and to reuse the current residues produced by the coal-powered plants. It is a known fact that, there are hopeful developments on usability of industrial wastes in construction technology. In this study, use of bottom ash-obtained at Bor Sugar Factory as by-product, Niğde-Turkey, which contains unburned carbon by about 20% in production of brick as an additive was investigated. The results showed that bottom ash could be used as an additive in producing bricks and this process was found to be a good alternative for recycling such wastes.
AtıfTR Dizin1İncele - MakaleYalnız künye2017Türkiye’de kamu sektöründe risk odaklı iç denetim yaklaşımı: kamu iç denetçilerine yönelik bir araştırma
Kurnaz, Ersin; Karcıoğlu, Reşat
Bu çalışma ile Türkiye'de kamu sektöründe risk odaklı iç denetim yaklaşımının uygulamada hangi düzeyde olduğunun belirlenmesi amaçlanmıştır. Bu kapsamda kamu iç denetçilerine bir anket uygulanmıştır. Uygulamaya ilişkin veriler Kruskal-Wallis Testi ve Mann-Whitney U Testi ile analiz edilmiştir. Sonuç olarak riski tanımlama ve değerlendirme sürecindeki eksiklikler nedeniyle, kamu kurumlarında risk odaklı iç denetim yaklaşımının uygulanma düzeyinin düşük olduğu tespit edilmiştir. Ayrıca iç denetim farkındalık seviyesi, risk olgunluk durumu, iç denetime bakış açısı ve iç denetimin odak noktası gibi değişkenlerle, kamu kurumlarında risk odaklı iç denetim yaklaşımının uygulanma düzeyi arasında istatistiki anlamda bir farklılığın olduğu sonucuna ulaşılmıştır
AtıfTR Dizin3İncele - MakaleYalnız künye2017Firma değerlemesinde indirgenmiş nakit akımları yönteminin kullanımı: bıst bilişim endeksinde yer alan firmalar üzerinde bir uygulama
Yalçın, Selçuk; Elmas, Bekir; Yılmaz, Hakan
Bu çalışmada, BIST bilişim sektöründe yer alan iki önemli firmanın şirket değerleme yöntemlerinden biri olan indirgenmiş nakit akımları yöntemine göre değerlemesi yapılmıştır. Firmalar indirgenmiş nakit akımları yöntemine göre değerlenirken, firmaya göre nakit akımları ve öz sermayeye göre nakit akımları olmak üzere iki yöntem kullanılmıştır. Bu çalışma bahsedilen yöntemlerin BIST bilişim sektörü üzerinde anlamlı ve uygulanabilir sonuçlar verip vermediğini araştırmak amacıyla yapılmıştır. Yapılan çalışmalar sonucunda, öz sermayeye göre indirgenmiş nakit akımları yönteminin, firmaya göre indirgenmiş nakit akımları yöntemine göre daha tutarlı sonuçlar verdiği tespit edilmiştir
AtıfTR Dizin4İncele - MakaleYalnız künye2017Determinants Of Innovation: A Cross-Country Data Analysis
Pabuçcu, Hakan; Imamoglu, Ilyas Kays
In this study investigates, whether competitiveness, gross domestic product (GDP), labor market efficiency, patent applications and technology readiness level are the determinants of innovation by using regression analysis and the data belong to the countries examined in the global competitiveness report. In addition to regression analysis, by using the variables, that have a statistically significant relationship between innovation, it is constructed a neural network (NN) model. In both models, the results are consistent each other and NN model determined as the best to explain the ability of relationship between variables for innovation estimates. The relationship between innovation and other explanatory variable is statistically significant except patent application. The patent applications variable doesn't provide an assumptions related with statistical methods. It excluded from the analysis for this reason. The relationship between variables found positive as expected. But the coefficient of GDP is very low near zero, so the effect is very weak as surprisingly.
AtıfTR Dizin2İncele - MakaleYalnız künye2017Exergy Analyses of Half-Effect, Single-Effect and Double-Effect Absorption Cooling Cycles
Karaali, Rabi
This work presents exergy and energy analysis of a half effect parallel flow, single effect and double effect absorption systems for comparison. For the thermodynamic properties of lithium bromide-water solutions a computer program is developed by the author in FORTRAN codes for th e energy and exergy analysis. It is found that the coefficient performance (COP) and the exergetic coefficient performance (ECOP) of the double effect parallel flow absorption systems are higher than the single effect and the half effect cycles. For the do uble effect cycle COP and ECOP are found as 1.196 and 0.284, and for the single effect cycle COP and ECOP are found as 0.68 and 0.254, respectively. For the half effect cycle COP and ECOP are found as 0.455 and 0.24, respectively. The exergy loss is calculated for each component. Most of the irreversibilities are found in the evaporator and in the absorber. It is concluded that the performance of the absorber and the evaporator is crucial for the three cycles. Improving and better design of the evaporator and the absorber will directly affect positively and improve the performance and the working conditions of the three cycles