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 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. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Drying of High Moisture Paddy by Two-Dimensional Spouted Bed Technique) ผู้เขียน:Somboon Wetchacama, Somchart Soponronnarit, Thanit Swasdisevi, Somkiat Prachayawarakorn, Jinda Panich-ing-orn, Suchart Suthicharoenpanich สื่อสิ่งพิมพ์:pdf AbstractThe objectives of this research were to design and construct a two-dimensional spouted bed dryer with draft plates, to study drying kinetics of paddy, paddy quality and specific primary energy consumption. Experimental drying conditions were as follows: initial paddy moisture contents (Mi) of 31.1-45.6% dry basis (d.b.), inlet air temperatures (Ti) of 130, 140 and 150?C, hold-ups (H) of 20, 25 and 30 kg. Experimental results showed that minimum spouting velocity of drying air at the inlet of drying chamber was 15.4-16.4 m/s equivalent to velocity through the draft plates of 3.9-4.1 m/s. The operating parameters affecting drying rate and specific primary energy consumption were drying temperature and specific air flow rate or hold-up. Those affecting head rice yield and rice whiteness were initial and final moisture contents of paddy and drying air temperature. The entrance height directly affected energy consumption of the fan. The suitable entrance height was 10 cm as it resulted in minimum energy consumption. The first order polynomial equation was accurate and appropriate for predicting drying rate. |
หัวเรื่อง:แนวทางการอบแห้งต้นหอมสับ ผู้เขียน:Manit Sukjindasatean, Somchart Soponronnarit, Somkiat Prachayawarakorn สื่อสิ่งพิมพ์:pdf AbstractThe object of this paper was to investigate strategies for drying spring onion by considering both experimental and simulated results. Product quality, drying capacity and energy consumption were taken into consideration. It was concluded that drying should be devided into 3 stages. In the 1st stage, drying air temperature was 80?C, specific air flow rate was 33.9 m3/min.kg dry matter and drying time was 0.5 h. In the 2nd stage, drying air temperature and drying time were kept unchanged but specific air flow rate was decreased to 13.5 m3/min.kg dry matter. In the final stage, drying air temperature was decreased to 72?C, specific air flow rate was also decreased to 6.8 m3/min.kg dry matter. Following these three stages, specific primary energy consumption was 6.17 MJ/kg H2O evap., drying time was 2.65 h and product quality was maintained. |
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: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:การอบแห้งข้าวโพดด้วยเครื่องอบแห้งแบบหมุน : แบบจำลองทางคณิตศาสตร์และแนวทางการอบแห้ง ผู้เขียน:Paiboon Rodviboonchai, Somchart Soponronnarit สื่อสิ่งพิมพ์:pdf AbstractThe objectives of this study are to investigate appropriate operating conditions and to develop a mathematical model for corn drying by a rotary dryer. Experimental results showed that if feed rate, rotating speed, tilt angel of drum or air velocity increased, residence time decreased. Residence time obtained from a developed equation was agreeable with experimental result. A thin layer drying equation confirmed by equations of mass and energy balance could predict drying rate relatively well. Energy consumption varied inversely with hold-up and moisture content of corn. A volumetric heat transfer coefficient depended on hold-up, rotating speed and air velocity. To dry corn with a rotary dryer, a relatively high air temperature and high value of hold-up should be practiced. Drying at a range of low moisture content of corn should be avoided. |
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: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:ไม่มีชื่อไทย (ชื่ออังกฤษ : Study of Parameters Affecting Drying Kinetics and Quality of Corns) ผู้เขียน:Somboon Wetchacama, Somchart Soponronnarit, Somkiat Prachayawarakorn, Adisak Pongpullponsak, Wuttitat Tuntiwetsa, Suprarat Kositcharoeankul สื่อสิ่งพิมพ์:pdf AbstractThe objectives of this research are to investigate factors affecting on drying rate of high moisture corn at high temperature with fluidisation technique and to develop a mathematical model for predicting drying rate. There were three following steps of drying process: 1) rapid drying using fluidised bed dryer at inlet drying air temperature of 130-170?C, 2) corn tempered for period of 40-180 minutes under the same temperature as drying from the step 1 and 3) drying with ambient air. Drying kinetic shows the inlet air temperature and the specific airflow rate significantly affecting the drying rate. Amongst three semiempirical drying equations (Wang and Singh, Page and Lewis), Page’s equation provides the best prediction. This study also aims to study the quality of corn dried in each step. Corn qualities in terms of aflatoxin content, percentages of breakage and stress crack, and colour change have been considered. Experimental results show that aflatoxin content in dried corn does not change. Breakage and cracking depend strongly on final moisture content and are relatively dependent to temperature. Tempering provides the improvement of colour while inlet air temperature has no effect. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Mathematical Simulation of Longan Fruit Drying) ผู้เขียน:Aree Achariyaviriya, Somchart Soponronnarit, Jirawan Tiansuwan สื่อสิ่งพิมพ์:pdf AbstractThe objectives of this study were to develop a mathematical model and to simulate longan drying for evaluating the optimum conditions. The specific energy consumption and average drying rate were used for the verification of the model. It was found that the simulated results agreed with some of those experiments. The effects on the specific energy consumption of drying air temperature, fraction of air recycled, and specific air flow rate were described. It was found that the specific air flow rate, drying air temperature and fraction of air recycled affect significantly on specific energy consumption. However, the effects of specific air flow rate and drying air temperature on specific energy consumption were small when fraction of air recycled was big. Additionally, it was also concluded that the optimum specific energy consumption of 3.3 MJ/kg-water occurred at fraction of air recycled of 95%, specific air flow rate of 28 kg-dry air/h-kg dry longans, drying air temperature of 75?C and drying time of 33 h. |
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: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 : คุณภาพผลิตภัณฑ์ ผู้เขียน:Somchart Soponronnarit, Petchara Preechakul สื่อสิ่งพิมพ์:pdf Abstract This paper described the experiments on in Store and batch drying of paddy under tropical climate like Bangkok. It was found that in-store drying was technically feasible and the quality of paddy after drying was very good. Its quality was also attractive when it was dried in batch providing that drying air temperature was appropriate. |
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:การชะลอความเสียหายของกองข้าวเปลือกชื้นโดยการระบายอากาศ ผู้เขียน:Athaporn Apivathananukul, Somchart Soponronnarit, Tipaporn Ouvithaya, Adisak Nathakaranakule สื่อสิ่งพิมพ์:pdf AbstractThe delay of deterioration of wet paddy by ventilation with cool air (15+8?C) and ambient air (30?8?C) was determined. Ventilation was applied in two forms, continuously and intermittently. The initial moisture content of paddy was 21.0, 22.2 and 26.0% wet-basis. Air flow rate used was 0.35 m3/min-m3 of paddy. Paddy could be cooled down to 20?C and to near ambient air temperature within one day by cool air and ambient air ventilation, respectively. The quality of paddy could be maintained at an acceptable level more than one month, either by cool air ventilation or ambient air ventilation. The quality of paddy in terms of whiteness was better for paddy ventilated with cool air. |