4E analysis of an underfloor heating system integrated to the geothermal heat pump for greenhouse heating
Ünal, Fatih | Demir, Bünyamin | Yaman, Kaan
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 m2 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 dollar/h, the unit exergy cost as 0.826 dollar/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 environm...
Comparison of spray nozzles in terms of spr zzles in terms of spray coverage and dr age and drop distributionuniformity at low volume
Demir, Bünyamin
This study was conducted to compare the spray coverage rate and spray uniformity of seven different types of hydraulic nozzles (standard flat fan nozzles, ST; multirange nozzles, LU; air induction nozzles, IDK; twinjet air-induction nozzles, IDKT; narrow cone-angle standard nozzles, STD; hollow cone nozzles, DC; and antidrift nozzles, AD) commonly used in pesticide applications at low application volumes. All spray applications were carried out at a constant operating pressure of 300 kPa and a low application volume of 80 L/ha. The experiments were carried out in a closed facility under controlled conditions. Spray applications were carried out with the aid of a 12-m-long linear, automatic speed-controlled spray simulator. Water-sensitive paper was used for drop sampling. The greatest spra...
Application of data mining and adaptive neuro-fuzzy structureto predict color parameters of walnuts (Juglans regia L.)
Demir, Bünyamin
Quality is the primary factor designating consumer satisfaction and the market price of agricultural commodities. Color and general appearance are the basic quality indicators for agricultural products. Surface colors are assessed through colorimetric measurements including L*, a*, and b* color parameters. In the present study, L*, a*, and b* color parameters of Bilecik, Fernette, Fernor, Kaman-1, Maraş-12, Maraş-18, Sunland, Şen-2, Yalova-1, and Yalova-3 walnut cultivars (color parameters of 100 randomly selected walnuts from each cultivar) were measured with a chroma meter (CR-5 Konica Minolta). Based on L*, a*, and b* measurements, equations from which color index (CI), chroma (C*), and hue (h*) angle parameters could be calculated were developed with the Find Laws algorithm of PolyAnal...
Effects of position angles in twin-jet spray applications on droplet penetration of hydraulic nozzles
Demir, Bünyamin
This study was conducted to determine the effects of different position angles in twin-jet spray applications on droplet penetration of different nozzle types. Seven different nozzle types (standard flat fan, ST; narrow flat fan, STN; multirange, LU; low-drift potential, AD; air-induction, IDK; twin-jet air-induction, IDKT) were used and nozzles were positioned +15° along the forward direction, perpendicular to ground surface 0? and reverse direction of forward -15°. Spray experiments at 100 L/ha constant application volume were conducted under controlled conditions of a closed facility. Water sensitive paper (WSP) was used as sampling surface. WSP samples were placed vertically and horizontally over both the metal frames and root collar of artificial plants. The present findings revealed ...
Determination of some physicomechanical and biochemical parameters of hazelnut (Corylus avellana L.) cultivars
Demir, Bünyamin
Hazelnut is one of the most popular nuts consumed by people; it has different cultivars in Turkey. The aim of the current study was to characterize some physicomechanical characteristics, shape features, color, and biochemical properties of 6 standard and 3 local hazelnut cultivars grown in Turkey. The shape and size properties of the samples were determined using image processing techniques as an alternative to conventional measurement methods. Additionally, principal component analysis (PCA) was used to classify the hazelnut samples in terms of the biochemical parameters of the hazelnut cultivars. According to the findings, the highest crude oil (63.25%) and lowest protein contents (13.63%) were observed in the Kalınkara cultivar. Oleic and linoleic acids were the major fatty acids for a...