Capacity and efficiency of any refrigerating system diminish rapidly as the difference between the evaporating and condensing temperature is increased by a reduction in the evaporator temperature. The single stage vapour compression refrigeration system using various refrigerants are limited to an evaporator temperature of -40 0C. Below temperature of -40 0C the either cascade refrigeration sys...

Chilgoza (Pinus gerardiana) is one of the pine nuts among six species found in India which produce edible nuts. Because of the traditional handling of this nut by tribals, it lasts only for few weeks in the market. Studies were undertaken to compare the solar drying modes for drying of this nut and screen out the suitable packaging material for its storage. Extracted nuts were dried under three...

Bu çalışmada Sakarya son otuz altı yıllık meteorolojik veri seti ve geliştirilen yazılımlar kullanılmıştır. yazılımlarla yılın on iki ayı için dış hava sıcaklık dağılımları, aylık sezonluk ısıtma soğutma derece saat değerleri farklı Referans İç Ortam Sıcaklığı(RİOS)’na göre hesaplanmıştır. Hesaplama sonuçlarına göre; Sakarya’da Isıtma dönemi ekim ayında başlamakta nisan bulmakta, ise mayıs başl...

In the performed experiment, changes in microstructure of steels S265 and X6CrNiTi18-10 due to their chemical-thermal treatment by boriding were studied. The process was a Durborid powder at 900 0C. During this process, surface layers Fe-B borides formed both analyzed sorts steels. differed morphology composition different degree alloying matrix additive elements. showed high adhesive cohesive ...

This study aims to examine the operating pressure effect on manufacture of biodiesel from Palm Kernel Fatty Acid Distillate (PKFAD) by using para-Toluene Sulfonic (PTSA) catalyst. The pressures studied are vacuum 70 kPa, 80 90 and 100 which varied with PTSA concentrations 5%, 10%, 15%, 20%, 25%, molar ratios methanol PKFAD 5:1, 6:1, 7:1, 8:1, 9:1, 10:1. Biodiesel production is carried out react...