INVESTIGATION OF DRY KINETICS OF AGRICULTURAL PRODUCTS IN HEAT PUMP DRYER
Project no. 740 · Status: Kapanmış · 2016
Summary
In this research, a batch dryer assisted heat pump with dehumidifier is developed and designed for some agro-foods with high moisture. The cooling capacity of system was 3500 W with a compressor powered 1.3 kW used the R-404a refrigerant. Two condensers were used in heat pump dryer system. A heat exchanger is added as pre cooling unit thus it is provided heat recovering. Tomato was dried in this study. Experiments were carried in four different drying air temperatures (40oC, 45oC and 50oC ) and in two seperate air velocity (1.65,1.9 and 2.3 m/s. Measurements of relative humidity from three points and temperatures from eight points into system were recorded. The values of the energy consumptions and the mass of the apple were measured during the experiments. VIII Drying times for temperatures 40oC, 45oC ve 50oC were between22 and 38 hours. The relative humidity of the inlet air (at the same temperature) are found as 18 %, 17%, 19 % and the relative humidity for the outlet air are measured as 24%, 23%, 22%respectively. The values of the SMER (Specific Moisture Extraction Rate) for temperatures 40oC, 45oC ve 50oC were calculated between 0.13 and 0.23 . The MER (Moisture Extraction Rate) values for temperatures 40oC, 45oC ve 50oC were determined between 0.20 and 0.35 . The values of COP obtained from the heat pump for temperatures 40oC, 45oC ve 50oC were estimated between 1.55 and 1.94