Güneş Enerji Destekli Mikrodalga Konveyör Kurutucu Kullanılarak Kuruma Davranışının Modellenmesi

In this study, a solar cavity heat receiver for a 36 m² two-axis parabolic dish collector has been designed, analyzed by employing computational fluid dynamics (CFD), manufactured in a local workshop and then tested experimentally on site. The receiver is an open type with a diameter of 624mm and a depth of 665mm and has a steel pipe spiral tubing with a helical tubing at the bottom. The diameter of the concentrated sunlight at the focal point was found to be 200 mm as a result of optical analysis with perfect mirror surface approach. The CFD model of the receiver, assuming the actual boundary conditions such as volumetric flow rate, input temperature of circulating water and line pressure showed that analyses approached the actual process, and also the process indicated that the analyses can be improved by taking into account the thermal radiation. Since for a period of approximately 30 minutes the system showed a steady-state characteristic during the daytime, a set of experimental measurements were carried out. It was found that the analytical outlet temperature was 1.07% higher than the experimentally measured outlet temperature and the numerical temperature was 0.15% higher than the experimental result.

Section: Introductionmentioning

confidence: 99%

An Improved Design and Analysis of a Solar Receiver

Ersöz¹,

Çerçi

Ekin

2021

“…Microwaves are parts of the electromagnetic spectrum and are located between visible light and radio waves. Wave length ranges from 10-3 m to 1 m and frequencies range from 0.3 GHz to 300 GHz [13]. Microwave drying differs markedly from conventional drying methods.…”

Section: Introductionmentioning

confidence: 99%

Mikrodalga Metodu Kullanılarak Kurutulan Havucun Bazı Kuruma Parametrelerinin Belirlenmesi

Çelen¹,

Moralar²

2020

Self Cite

In this study, moisture content, drying time, the diffusion coefficient, activation energy, drying rate, drying efficiency and the energy consumed during the drying of carrot were determined by using the designed microwave supported conveyor drier. In the experiments, the carrot slices of 4 mm, 7 mm and 10 mm thickness were dried at a power of 1050 W, 1500 W and 2100 W microwave power. The conveyor drier has the conveyor speed of 0.245 m min -1 for drying process. At the end of drying process, it was found that the effective diffusivity coefficients, energy consumption, drying rate and drying efficiency have increased as the microwave power increased. We concluded that 1050 W is the optimum value for carrot drying in terms of drying time and energy consumption.Öz: Bu çalışmada nem içeriği, kuruma süresi, difüzyon katsayısı, aktivasyon enerjisi, kuruma hızı, kuruma etkinliği ve havuçun kurutulması sırasında tüketilen enerji, tasarlanan mikrodalga destekli konveyör kurutucu kullanılarak belirlenmiştir. Deneylerde, 4 mm, 7 mm ve 10 mm kalınlığındaki havuç dilimleri, 1050 W, 1500 W ve 2100 W mikrodalga gücünde kurutuldu. Konveyör kurutucusu, kurutma işlemi için 0.245 m min -1 konveyör hızına sahiptir. Kurutma işleminin sonunda, mikrodalga gücü arttıkça efektif difüzyon katsayısı, enerji tüketimi, kuruma hızı ve kuruma verimliliğinin arttığı bulunmuştur. Kurutma süresi ve enerji tüketimi açısından havuç kurutma için 1050 W gücün en uygun değer olduğu sonucuna varılmıştır.

“…The best models were the Henderson and Pabis model for dill, the two-term model for parsley, and the logarithmic model for sweet basil [11]. Çelen et al carried out modelling of drying behaviour using microwave conveyor dryer assisted solar energy [12].…”

Section: Introductionmentioning

confidence: 99%

Drying Behaviors of Mint Leaves in Vacuum Freeze Drying

Kovacı

Dikmen

Şahin

2020

In this study, the drying behaviour of mint, which is one of the medicinal plants in freeze-drying, was investigated. The products were dried at three different temperatures (40, 50, 60 o C) and three different pressures (30, 50, 80 kPa) in a freeze-drying system designed as a prototype. Drying time is decreased with increasing cabin pressure. Optimal working conditions in the freeze-drying of mint leaves were determined as 30 kPa chamber pressure and 50°C drying temperature. Four thin layer drying models, namely Newton model, Tow term exponential model, Logarithmic model, and Wang and Singh model are tested to predict the drying behaviour. The Wang and Singh model has presented the best prediction that has an R 2 value of 0.99687.