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 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: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:การพัฒนาแบบจำลองทางคณิตศาสตร์สำหรับการอบแห้งผลไม้โดยใช้ปั๊มความร้อน ผู้เขียน:Waraporn Rattanongpisat, Somchart Soponronnarit, Thanit Swasdisevi สื่อสิ่งพิมพ์:pdf AbstractA mathematical model for papaya glace' drying using heat pump has been developed. It comprises of drying rate equation, mass and energy balance equations, thermo-physical property of papaya glace' equations and heat exchanger equations. Successive substitution method was used for finding the solution. It was found that the model was fairly accurate for predicting final moisture content, air temperature at various parts in the system and temperature of refrigerant especially at low moisture level of papaya glace'. The mathematical model was then used to find out strategy for drying papaya glace' with a specific air flow rate of 29.8 kg/h-kg dry papaya glace'. Simulated results showed that drying time and energy consumption was decreased when the drying air temperature was increased. In addition, the appropriate bypass air ratio was in the range of 86-90 %. |
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: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: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: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:ผลของอุณภูมิและความชื้อสัมพันธ์ที่มีต่ออัตราการเหลืองของข้าวเปลือกชื้น ผู้เขียน:Nirachara Srisubati, Somchart Soponronnarit, Tipaporn Yoovidhya สื่อสิ่งพิมพ์:pdf AbstractThe effects of temperature and relative humidity in storage chambers on yellowing rate of paddy were investigated and then an empirical equation for predicting the yellowing rate was developed. Paddy was conditioned using saturated salt solutions at relative humidities from 80 to 95 % and temperatures 35, 45, 55, 60, and 65?C. The yellowing rate was found to follow the zero order kinetics. The yellowing constant values (k) increased exponentially with temperature while increased linearly with water activity. The magnitude of activation energy varied from 130-145 kJ/mol. A predictive equation for determining yellowing rate was ln k = ? - ?aw - ?/T + (?aw)/T where aw is water activity (valid from 0.80 to 0.95), T is absolute temperature (valid from 308 to 338 K) and ?, ?, ? and ? are constants. The results of variance analysis showed that temperature, water activity and their interaction significantly influenced the yellowing rate of paddy. |
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. |
หัวเรื่อง:แนวทางการอบแห้งสับปะรดแช่อิ่มที่เหมาะสมที่สุด ผู้เขียน:Marina Nuimeem, Somchart Soponronnarit, Boosya Bunnag สื่อสิ่งพิมพ์:pdf AbstractA mathematical model for pineapple glace' drying based on thermal equilibrium between the drying air and the product was developed. The effect of temperature on product quality was observed. The effect of temperature, air flow rate and traction of air recycled on drying time and energy consumption were also observed. The criteria for optimum drying of pineapple glace' in a cabinet dryer were product quality, drying time and energy consumption. Experimental and simulated results showed that a drying temperature of 65?C, a specific air flow rate of about 11 kg dry air/h-kg dry pineapple glace' and about 0.75 of air recycled should be used. |
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 : 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:ไม่มีชื่อไทย (ชื่ออังกฤษ : Continuous Drying of Paddy in Two-Dimensional Spouted Bed) ผู้เขียน:Thanid Madhiyanon, Somchart Soponronnarit, Warunee Tia สื่อสิ่งพิมพ์:pdf AbstractAn industrial–scale prototype of spouted bed paddy dryer with a capacity of 3,000 kg/h was constructed and tested. The prototype was shown to be a desirable feature of spouted bed as well as capability of continuous drying and offering consistent results through the testing period. Experimental results showed that the prototype performed well on moisture reduction and milling quality. Head rice yield and whiteness were not significantly changed regardless of using inlet air temperature up to 146?C. At present, feed rate is limited to not exceed 1,000 kg/h and thermal energy consumption is relatively high, i.e. in range of 5.9-8.6 MJ/kg water evaporated. This could be attributed to using of improper blower. The relative results of increasing air velocity and pressure should be studied. |