Evaluation of feasibility analyses for different hub heights of a wind turbine

In this study, techno-economic and environmental feasibility analyses of a wind turbine for different hub connection heights were investigated using RETScreen Expert energy analysis program. Çerkezköy district of Tekirda? province was chosen as the region in which the wind turbines will be constructed. According to the analysis of hourly wind speed data recorded by a meteorology station established in Çerkezköy, it can be easily said that the annual average wind speed for 10 m altitude is 5.305 m/s and the directions of the prevailing winds are between NE (45o) and ENE (67.5o). The model of the wind turbine chosen in the present study is the Sinovel 1500/77, and techno-economic and environmental evaluations were made for the hub connection heights of 65, 80 and 100 m. In accordance with the study results, when the payback period is evaluated in terms of energy production cost and greenhouse gas reduction potential, the wind turbine with 100 m hub connection height exhibits better results than others with 65 and 80 m. It is thought that this study will guide selecting a suitable hub height for wind power plants and wind turbines that are planned to be established in Çerkezköy, one of the largest industrial regions of Turkey to obtain cost-effective and environment-friendly conditions. © 2022

Assessment of CO2Emissions Reduction Based on Different Insulation Materials in Residential Buildings: Example from Turkey

2021 11th International Conference on Future Environment and Energy, ICFEE 2021 -- 28 January 2021 through 30 January 2021 -- -- 170060In this study, the reduction of CO2 emissions caused by energy savings due to thermal insulation materials applied to the exterior of buildings was investigated. The study includes the evaluation of four different insulation materials including XPS, EPS, PUR and Rock Wool in terms of the reduction potential of CO2 emissions for all city centers in Turkey. Moreover, the optimum insulation thicknesses of the buildings that have both heating and cooling needs were determined for these insulation materials by means of Life Cycle Cost Analysis. The annual energy needs per unit area of the external walls of the buildings, which are insulated according to their optimum insulation thickness were determined and correspondingly the amount of fuel needed to meet this energy was calculated. In the study, CO2 emission values released from buildings to atmosphere were compared in terms of fuel amounts obtained from total energy demands during heating supplied from natural gas and cooling supplied from electricity of the residential buildings insulated with diverse insulation materials. Consequently, when CO2 reduction potentials of the buildings insulated with materials in the optimum insulation thickness are compared with those of the uninsulated buildings, insulation material providing highest potential in CO2 emission mitigation was to be found as Rock wool. © Published under licence by IOP Publishing Ltd

Investigation of the Effects of Using Plastic Instead of Aluminum in Tractor Engines, Intercooler Tanks on Engine Performance

In recent years, researchers have been working on more environmentally friendly engine systems and the efficient use of depleting fuel resources. One of these research topics is intercoolers used in turbocharged engines. Intercooler tanks are generally made of aluminum due to their good heat transfer coefficient. In this study, the suitability of the use of plastic tanks was investigated by examining the engine performance changes as a result of using plastic instead of aluminum, which is the traditional material, in the intercooler tanks of an 81 kW Perkins tractor engine. For this purpose, experiments were carried out at 1400 and 2200 rpm for intercoolers with both materials. According to the results obtained from the experiments, a 0.62%25 torque increase was obtained at 1400 rpm in the engine with a plastic tank material intercooler compared to the engine with an aluminum material intercooler. According to the data obtained from the experiments carried out at 2200 rpm, a power increase of 0.74%25 was determined. Similarly, it was determined that the effects of parameters such as radiator upper and lower hose temperatures, turbo inlet and outlet air temperatures, and intake manifold inlet temperature on engine performance were negligible. According to these findings, it has been determined that if the tanks of the intercoolers are plastic, there will be a negligible performance loss compared to the traditional material aluminum. Plastic is lighter, cheaper, and easier to manufacture than aluminum. Considering the production and operating conditions, it was concluded that such materials should be researched and developed by manufacturers

AN APPLICATION TO ERROR AND UNCERTAINTY ANALYSIS IN INDUSTRIAL TYPE DRYER EXPERIMENTS

In this study, information is given about the driers commonly used in the industry and the experimental errors anduncertainties that will be encountered in the experiments using these driers are tried to be explained by using the dataobtained from the experiments carried out in an 8 chambers hot oil heated stenter, which is a conveyor type convectiondryer. The fabric used in the experiments is the Thessaloniki type fabric, containing 67% cotton and 37% polyester. Theexperiments were carried out at a drying air temperature of 160 ºC and a fabric advance rate of 23 m/h (0.383 m/s). Thus,the example of error analysis in such experimental studies is provided and criteria that may cause an error for drying systemsare discussed. As a result of the uncertainty analysis, the largest uncertainty in the system occurred in temperaturemeasurements at ±0.367 - ±0.568 ºC values and the error rate for the whole system was found to be 4.08%. In terms ofconducting the experiments in real production conditions and the materials and methods used in the experiments, this studyis thought to will be help researchers that working on drying systems in their experimental studies

Classification of Pulmonary Nodules by Using Hybrid Features

Early detection of pulmonary nodules is extremely important for the diagnosis and treatment of lung cancer. In this study, a new classification approach for pulmonary nodules from CT imagery is presented by using hybrid features. Four different methods are introduced for the proposed system. The overall detection performance is evaluated using various classifiers. The results are compared to similar techniques in the literature by using standard measures. The proposed approach with the hybrid features results in 90.7% classification accuracy (89.6% sensitivity and 87.5% specificity)

INVESTIGATION OF EFFICIENCY OF R717 REFRIGERANT SINGLE STAGE COOLING SYSTEM AND R717/R744 REFRIGERANT CASCADE COOLING SYSTEM

This study is an adaptation of ammonia cascade cooling systems using carbon dioxide on ice cream production machinesand includes thermodynamic analysis of R717/R744 cascade refrigeration system with R717 refrigerant single-stagerefrigeration system and investigation of its efficiency. As a result of the analyses, the COP value of the single-stage systemwas 3.67, the Carnot efficiency was 0.57, the second law efficiency was 0.19 and the power required to operate thecompressor was 27.55 kW. In the cascade cooling system, the COP value was 4.46, the Carnot efficiency 0.59 and thecompressor power 22.7 kW in the high-temperature part, while the COP value was measured as 14.65, the Carnot efficiency0.58 and the compressor power 6.4 kW in the low-temperature part. For the whole cascade system, the COP 3.24 and thesecond law efficiency were found to be 0.43. When the results were compared, it was concluded that although the COPvalue of the cascade cooling system was 0.43 points lower than the single-stage ammonia system, when our country'sclimate conditions and the thermophysical properties carbon dioxide gas were considered together, one of the most suitabledesigns was the cascade cooling system

Contraception knowledge status of marriage applicants couples in the Van city

This study was performed to determine ofcontraception knowledge levels and planning contraceptionmethods after marriage that couples have applied tofamily planning center in the Van city.Methods: Study has planned as descriptive manner. Thisstudy was performed on 255 couples who have appliedfor official wedding procedure to Van maternal and childhealth and family planning center between September2010 - January 2011. Participants were determined on avoluntary basis. Questionnaires were filled out by familymedicine face to face with couples.Results: Totally, 21.3% percent of women, 23.5% percentof men have primary school degree. 18% of women,93.4% of men have a profession. 12.1% percent of womenand 12.9% percent of men does not have any knowledgeabout contraceptive and 43% of couples do not consideruse any contraceptive method after marriage. The resultshas shown that when evaluate the couples, in terms ofthe distribution of contraception information, the coupleshave more information about condoms, pills, coil, injectionand withdraw methods then tube ligation, implants,spermicides, vasectomy and the calendar methodsConclusion: Van region has a low socio-economic status.The couples should be informed about family planningbefore marriage, to talk about advantages of collaborationbetween the couples about birth control methodchoice.Key words: Reproductive health, family planning, contraceptio

4E analysis of an underfloor heating system integrated to the geothermal heat pump for greenhouse heating

In this study, 4E (energy, exergy, exergoeconomic, and exergoenvironmental) analysis of an underfloor heating system integrated with the geothermal heat pump of a greenhouse with a usage area of 90 m(2) has been made. When the results of the 4E analysis applied to the system and its elements were examined, the energy efficiency of the heating system in the winter months has been determined to be 77.85% and the exergy efficiency 30.61%. According to the results of exergoeconomic analysis, the levelized energy cost of the system has been determined as 0.894 $/h, the unit exergy cost as 0.826$/h, and the exergoeconomic factor value as 51.12%. According to the results of the exergoenvironmental analysis, the part-based environmental impact of the system was 0.0910 mPts/s, the environmental impact value due to exergy was 0.1823 mPts/s, and the exergoenvironmental factor value was 37.77%. In addition, the equivalent CO2 emission value that will occur if the heating requirement of the greenhouse is met with a natural gas boiler instead of a geothermal heat pump was investigated and a comparison was made between the two systems. Accordingly, it has been determined that the emission of 909.75 kg equivalent carbon dioxide to the environment will be prevented in the 4-month period, which is considered the heating season, by using the heat pump. As a result, the examined heating system has been evaluated as the effective system for heating the greenhouse, reducing energy consumption, and reducing emissions that cause environmental pollution

EDİRNE İKLİM ŞARTLARINDA ÇEVRE SICAKLIĞI VE RÜZGAR HIZININ POLİKRİSTAL FOTOVOLTAİK PANEL ÇIKIŞ GÜCÜNE ETKİLERİNİN İNCELENMESİ

Bu çalışmada, Edirne ilinde kurulu bir polikristal fotovoltaik panelli güneş enerjisi sisteminin performansının çevre sıcaklığı ve rüzgar hızı ile değişimi araştırılarak, bu unsurların fotovoltaik sistem performansı üzerine etkileri incelenmiştir. Bu amaçla 1 Ağustos – 30 Eylül 2020 tarihleri arasında yapılan deneyde kullanılan sensörler aracılığı ile ölçülen iklimsel veriler ile panel çıkış gücü ve akım değerleri, sisteme bağlı bulunan Arduino Mega mikro işlemci karttaki yazılım vasıtasıyla hafıza kartına (SD kart) 10 dakika aralıklarla aktarılması sonucu elde edilmiştir. Çalışmadan elde edilen bulgulara göre, ortam sıcaklığındaki artışın fotovoltaik panellerin sıcaklığını arttırdığı, güneş radyasyonu miktarının ise üretilen elektriği doğru oranda etkilediği tespit edilmiştir. Fotovoltaik panel performansına rüzgâr hızının etkileri değerlendirildiğinde ise, rüzgâr hızının artan değerlerinde panel sıcaklıklarının düştüğü tespit edilmiş, fakat incelenen bölge için belirlenen nominal rüzgar hızlarının sayısının çok düşük değerlerde olduğu bu sebeple panellerin soğutulmasında rüzgarın direkt soğutucu olarak kullanılmasının yetersiz olacağı, panellerin soğutulması için yardımcı soğutma sistemlerinin kullanılması durumunda panellerin çıkış gücünün artacağı sonucuna varılmıştır

Evaluation of resistance of Turkish bread wheat (Triticum aestivum) varieties to recently emerged Puccinia striiformis f. sp. tritici races

Using genetic diversity has made significant contribution to stripe rust resistance to improve wheat production. However, rapid evolution of the Puccinia striiformis f. sp. tritici (Pst), and emergence of virulent races can negatively affect the wheat genotypes with race-specific resistance gene(s). In this study, reactions of 130 bread wheat varieties, released from 1931 to 2014, were evaluated to recently emerged Pst races in Turkey, PSTr-6 and PSTr-23, at seedling and adult-plant stages. 65.4% and 67.7% of wheat varieties showed susceptible reaction to PSTr-6 and PSTr-23 at seedling stage, respectively. Moreover, coefficient of infection (CI) values generated by infection type (IT) and disease severity (DS) data demonstrated that PSTr-23 (59.78) was more virulent than PSTr-6 (57.93) at adult-plant stage. In addition to these, the presence of important yellow rust (Yr) genes in these varieties was investigated at molecular level. It was determined that the frequencies of three Yr genes, Yr5, Yr10 and Yr15, among these varieties were 1.5, 6.2 and 3.8%, respectively. However, none of them had Yr36 and only one variety had Yr5+Yr10 combination with frequency of 0.7%. In conclusion, most varieties have not these Yr genes and possess a moderately resistance/susceptible reaction to both races in general. © 2022 Elsevier Lt