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    Decreasing the Cooking Time of the Dry Beans Without Lowering the Quality
    (Gazi Univ, 2015) Aktas, Mustafa; Ceylan, Ilhan; Sevik, Seyfi; Dogan, Hikmet
    The aim of this study is to decrease the cooking time of the dry beans without lowering the quality. A second soaking was applied to the dry beans after drying, which were cooked for 2 hours following the first cooking. The dry beans were dried at 40 degrees C drying air temperature after the soaking. The volume of the beans was increased by about 16% through these procedures. Cooking period after the second drying was decreased by 1 hour. Results also showed that there was no split skin on the outer layers of the dry beans, which is a notable quality criterion, owing to the method used while soaking and, soaking and drying operations on the dry beans before packaging decreased the pre-cooking soaking and cooking period. Thus, energy and time saving can be obtained during cooking.
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    DESIGNING, MANUFACTURING AND PERFORMANCE EXPERIMENTS OF HEAT PUMP RED PEPPER DRYER ASSISTED SOLAR ENERGY
    (Turkish Soc Thermal Sciences Technology, 2010) Aktas, Mustafa; Ceylan, Ilhan; Dogan, Hikmet; Aktekeli, Zuelfikar
    In this study, redpeppers were dried in a heat pump dryer assisted solar energy. Redpeppers have been dried from initial moisture content (10.81 g water/g dry matter) to final moisture content (0.16 g water/g dry matter) by using heat pipe solar collector and air to air heat pump system. In the drying system, 24 h drying period was provided heat pump support. In PID controlled dryer, air velocity changed according to the temperature value which is set in process control device. Redpeppers were dried at 50 degrees C dry bulb temperature and average 0.4 m/s air velocity in a period of 210 min. According to experiment results, average heating coefficient performance (COPwh) and specific moisture extraction rate (SMERws) were calculated for whole system as 2.24 and 0.209 kg/kWh respectively.
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    Development and Analysis of a Multi-evaporator Cooling System with Electronic Expansion Valves
    (Springer Heidelberg, 2017) Atas, Safak; Aktas, Mustafa; Ceylan, Ilhan; Dogan, Hikmet
    In this study, a vapor compression cooling system with three evaporators and electronic expansion valves was designed, manufactured and tested experimentally. Compressor of this system was converted to be inverter driven which enabled it to run at variable speeds. Temperature values of cold rooms were controlled more sensitive by using electronic expansion valves. Energy analysis was done by comparing the operating parameters of the system with constant and variable speeds. Programmable logic control (PLC) and cold room controls were used to control the system. The PLC device provided the variable operation of the system by determining the required operation frequency of the compressor according to the changes at the suction line. Using this program, the desired values are set on the PLC screen and the multi-evaporator cooling system was tested at various conditions. The desired conditions are determined for the system at 0,+5 and -5 degrees C temperatures. Calculations on the experimental results revealed that the cooling coefficient of performance is 1.86 for the constant frequency operation and 2.22 for the variable frequency operation. Besides, it was determined experimentally that the system running on variable frequency consumed 20% less electrical energy than the constant frequency system.