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 หัวเรื่อง:การศึกษาพารามิเตอร์สำหรับวิเคราะห์การอบแห้งสับปะรดแช่อิ่ม ผู้เขียน: Aree Teanchai, Somchart Soponronnarit สื่อสิ่งพิมพ์:pdf AbstractThe objectives of this study are to determine experimentally some properties of pineapple glace such as equilibrium moisture content, moisture diffusion coefficient, density and specific heat. These parameters are useful and necessary for drying analysis. The equations describing these parameters were found out by curve fitting using least square technique. The equilibrium moisture content was determined by static method using saturated salt solution. It was found that equilibrium moisture content decreased with the temperature for relative humidity range from 0-35 percent, but increased with the temperature for relative humidity higher than 45 percent. The equation of Iglesias & Chirife, 1978 was found to be accurate to describe the experimental results. The results of the drying of pineapple glace showed that moisture diffusion coefficient increased exponentially with drying temperature and the effect of air velocity was not significant. The temperature range from 55-65oC was suitable for drying pineapple glace regarding to good quality. For other parameters such as density and specific heat, it was found that the density increased linearly with moisture content in dry basis and specific heat increased linearly with moisture content in wet basis. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effect of Temperature on Soybean Quality Using Spouted Bed Technique) ผู้เขียน:Songchai Wiriyaumpaiwong, Somchart Soponronnarit, Somkiat Prachayawarakorn สื่อสิ่งพิมพ์:pdf AbstractThe effect of temperature on moisture reduction rate and soybean qualities using a two-dimensional spouted bed dryer has been studied. Air velocity was varied in a range of 15.86-20.50 m/s, with a fixed holdup of 25 kgs. The soybeans with initial moisture levels varying between 28 and 32% dry basis were dried to 12-17% dry basis using inlet air temperatures of 120-150?C. The experimental results indicate that higher temperatures provide faster moisture reduction rate. The qualities of soybean have also been considered in terms of stress cracking, breakage, urease activity and protein solubility in 0.2% KOH. It is shown that the percentages of cracking and breakage depend on temperature, final moisture content and degree of collision of kernel with deflector. The percentages of stress crack and breakage lie in the range of 50-60% and of 3-24%, respectively. The urease activity and protein solubility are accepted with slightly changing in the protein quality. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Parameters for Mango Glace? Drying Simulation) ผู้เขียน:Somboon Wetchacama, Somchart Soponronnarit, Thanit Swasdisevi, Sakrin Ratsie สื่อสิ่งพิมพ์:pdf AbstractThe objective of this research was to investigate parameters affecting drying rate of mango glace?, i.e., diffusion coefficient, equilibrium moisture content, specific heat and density of mango glace?. The equilibrium moisture content was determined by static method at temperature of 45-70?C and relative humidity of 10-90%. Saturated salt solutions and an oven were used for controlling relative humidity and temperature, respectively. It was found that equilibrium moisture content decreased with temperature for relative humidity ranging from 10-60%. The BET equation was found accurate to describe the experimental results. The results obtained from drying experiment indicated that diffusion coefficient increased exponentially with drying temperature. It was further found that density and specific heat of mango glace? decreased and increased linearly with moisture content, respectively. |
หัวเรื่อง:ระบบอบแห้งข้าวเปลือกในโรงสีข้าว ผู้เขียน:Wathanyoo Rordprapat, Somchart Soponronnarit, Montri Wangji สื่อสิ่งพิมพ์:pdf AbstractAppropriate paddy drying systems in large rice mills was investigated to reduce paddy moisture content from 20 %wet-basis to 14 %wet-basis. Rice after milling was also in good quality. In this study, the performance of paddy drying systems in three rice mills with the same types of dryers but different installation and drying operation were investigated. Paddy quality and energy consumption of each dryer in each system were studied. The results obtained were used to find appropriate paddy drying condition and then to design high efficient paddy drying system. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Development of a Commercial Scale Vibro-Fluidized Bed Paddy Dryer) ผู้เขียน:Somboon Wetchacama, Somchart Soponronnarit, Wuttikon Jariyatontivait สื่อสิ่งพิมพ์:pdf AbstractThe objectives of this research were to design, construct and test a prototype of vibro-fluidized bed paddy dryer with a capacity of 2.5–5.0 tons/h. Experimental drying conditions were: air flow rate 1.7 m3/s (1.9 kg/s), bed velocity 1.4 m/s, average drying air temperature 125–140?C, residence time of paddy approximately 1 minute, bed height 11.5 cm, fraction of air recycled 0.85 (1.6 kg/s) and vibration of intensity 1 (frequency 7.3 Hz and amplitude 5 mm.). It was found that moisture content of paddy was reduced from 28 to 23 % d.b. at a feed rate of 4821 kg/h. Electrical power consumption and average diesel oil consumption were 9646 W and 17.6 1/h, respectively. Specific primary energy consumption was 6.15 MJ/kg-water evap. Electrical power of blower motor and vibrator motor was 55 % as compared to electrical power of blower motor used in fluidized bed drying without vibration. For operation of 12 hours/day and 90 days/year, paddy drying cost was 1.50 baht/kg-water evap. (fixed cost 0.50 baht/kg-water evap. and operating cost 1.00 baht/kg-water evap., US$ 1 = 40 baht). |
หัวเรื่อง:การทดสอบการอบแห้งข้าวเปลือกแบบในถังเก็บและแบบเป็นงวด : ความสิ้นเปลืองพลังงาน ผู้เขียน:Somchart Soponronnarit, Somchai Chimsakolthanakorn สื่อสิ่งพิมพ์:pdf AbstractThe objective of this paper was to study the energy consumption patterns in drying paddy under various drying air conditions and drying strategies. It was found from the experiment that ambient air drying with low air flow rate consumed final energy about one half of that drying with high air flow rate. However, they were about the same when primary energy was considered except the ambient air drying with high air flow rate which consumed primary energy much greater than the others. Ambient air low flow rate should be used in slow drying. Ventilation at particular times when relative humidity of drying air was not too high or continuous ventilation with controlled relative humidity should be practiced. If fast drying was required, warm air with high flow rate should be used. |
หัวเรื่อง:การออกแบบและทดสอบการอบแห้งข้าวเปลือกในถังเก็บ ผู้เขียน:Somkiat Prachayawarakorn, Somchart Soponronnarit, Prasai Chalidapongs, Adisak Nathakaranakule สื่อสิ่งพิมพ์:pdf AbstractThe objective of this paper was to design and test of in-store pady drying. Both energy consumption and grain quality were taken into consideration. Economic analysis was also conducted. Experimental results indicated that uniform air flow through paddy bed was achieved. Pressure drop through the grain bed was the most significant. When paddy was dried from 16% to about 14% wet-basis, using an air flow rate of 2.03 m3/min-m3 of paddy, energy consumption was 19 bath/ton, head yield was 11% higher conpared with direct sun drying. Benefit gained from higher head yield was 160 baht/ton. Dry paddy in storage should be ventilated periodically by ambient air, at least one hour each time. Mathematical simulation of paddy drying indicated that energy consumption was 35 baht/ton when paddy was dried from 18% to 14% wet-basis, using an air flow rate of 1.3 m3/min-m3 of paddy. Economic analysis based on mathematical model data showed that in-store drying system yielded higher rate of return compared with interest rate and short pay back period. |
หัวเรื่อง:การอบแห้งโดยใช้ปั๊มความร้อนในระดับอุตสาหกรรม ผู้เขียน:Thanid Madhiyanon, Somchart Soponronnarit, Thanit Swasdisevi สื่อสิ่งพิมพ์:pdf AbstractThe prototype of an industrial-scale heat pump dryer (HPD) was designed, constructed and evaluated for performance. Drying chamber contained four trolleys with product capacity of 600-700 kg. In the experiments, papaya glace' was dried in closed system at an average temperature of 55?C, specific air flow rates of 25-32 kg dry air / h - kg dry papaya glace' and the evaporator by-pass air of 81%. The papaya glace' with initial moisture content of 83-86% dry basis was dried to final moisture content of 12-14% dry basis within approximately 32 hours. No significant variation of the average final moisture gradient along horizontal and vertical of dryer was observed (due to uniform air distribution within drying chamber). The results of experiment indicated that drying rate decreased rapidly with time, while total power consumption remained nearly constant. At high initial moisture content, the rate of moisture removal was higher than that of low initial moisture content. (The maximum average drying rate and SMER were 9.34 kg water evap/h and 0.782 kg water evap/kWh, respectively. The maximum average MER is 9.21 kg water cond/h, and the relative lowest average specific energy consumption is 4.92 MJ/kg water evap. The (COPhp)sys varied from 4.2 to 4.9 which was higher than (COPhp)used obtained by the internal condenser load which varied from 3.3 to 3.8. This attributed to the excess heat rejected to atmosphere through the external condenser.) The quality of dried papaya glace' in terms of color was acceptable due to low drying temperature. In conclusion, HPD achieved high energy efficiency, and it was feasible to be commercialized, particularly in food drying industry. |
หัวเรื่อง:การอบแห้งเมล็ดในมะม่วงหิมพานต์ด้วยเครื่องอบแห้งแบบถาดหมุน ผู้เขียน:Thanit Swasdisevi, Somchart Soponronnarit, Adisak Nathakaranakule, Pieamsin Thongthip สื่อสิ่งพิมพ์:pdf AbstractThe objective of this research is to investigate a suitable condition for drying cashew kernel with rotating tray dryer. Criterion used to consider are as follows: quality of product after drying, drying time and specific energy consumption. Experimental results showed that the drying time decreased when drying air temperature increased. The appropriate drying condition is at drying air temperature of 90?C, recycled air fraction of 0.45 and specific air flow rate of 70 kg dry air/h-kg dry cashew kernel (air velocity 0.07 m/s). The product quality after drying is acceptable while drying time is low. The specific energy consumption is 68.22 MJ/kg water evap. or 6.85 MJ/kg cashew kernel. Drying cost analysis is reported at 260 baht/kg water evap. or 26.13 bath/kg cashew kernel. |
หัวเรื่อง:การรักษาคุณภาพข้าวเปลือกโดยการระบายอากาศเป็นระยะๆ ผู้เขียน:Somkiat Prachayawarakorn, Somchart Soponronnarit, Adisak Nathakaranakule, Sittichai Inchan สื่อสิ่งพิมพ์:pdf AbstractThe effect of different storage conditions to paddy quality was observed Chacherngsao Agricultural Cooperative. The ambient air flow rate of 1.6 m3/min-m3 was ventilated through the paddy bulk every month, once a month for 2 hours. The results indicated that the ventilation decreased the temperature in paddy bulk. The quality of paddy stored with intermittent ventilation was better in terms of whiteness but was approximately the same in terms of head yield compared to paddy stored without ventilation. |
หัวเรื่อง:การอบแห้งข้าวเปลือกโดยเทคนิคฟลูอิไดเซชัน เพื่อการเพิ่มปริมาณข้าวเต็มเมล็ด ผู้เขียน:Adithap Taweerattanapanish, Somchart Soponronnarit, Somboon Wetchacama, Ngamchuen Kongseree, สุนันทา วงศ์ปิยชน สื่อสิ่งพิมพ์:pdf AbstractExperimental result of fluidized bed paddy drying by high air temperature (140 and 150?C) at various initial and final moisture contents showed that head rice yield could be increased to a maximum value at the range of final moisture content of paddy of 19-22 % wet-basis. The factors affecting the increase of head rice yield were the initial and final moisture content of paddy and the tempering process. |
หัวเรื่อง:การศึกษาเปรียบเทียบแบบจำลองทางคณิตศาสตร์ของการอบแห้งข้าวโพด ผู้เขียน:Adisak Nothakoranakule, Somchart Soponronnarit สื่อสิ่งพิมพ์:pdf AbstractThe comparison among the results obtained from two corn drying mathematical models: non-equilibrium model and near-equilibrium model and the one obtained from the experiments was studied. The experiments comprised three strategies: 1) Low air flow rate, high temperature, LFHT (5.5-26.0 m3/min-m3 of corn, 60-90oC) 2) Low air flow rate, low temperature, LFLT (5.5-26.0 m3/min-m3 of corn, 45-55oC) 3) High air flow rate, Low temperature, HFLT (30.0-45.0 m3/min-m3 of corn, 45-55oC). Results are described. The simulated moisture contents obtained from the non-equilibrium model were close to those of experiments in case of LFLT but they were not agreeable very well in cases of LFHT and HFLT. The simulated moisture contents obtained from the near-equilibrium model were a little bit lower than those obtained from the non-equilibrium model in cases of LFHT and LFLT and were nearly the same in case of HFLT. The temperatures calculated from both models were nearly the same but were higher than those of experiments for all drying strategies. The near equilibrium model was more interest to use than the non-equilibrium model because of small difference of results and much less computer time spending about 5 times. |