We present in this paper the results of experimental and numerical study of the thermal performances of a cook stove prototype intended for the parboiling of paddy rice. Thus, the experimental results show that the op...We present in this paper the results of experimental and numerical study of the thermal performances of a cook stove prototype intended for the parboiling of paddy rice. Thus, the experimental results show that the optimal mass of husk rice is M = 7.15 kg for a good combustion within the combustion chamber and got a maximum temperature at the level of the burners surface. This temperature is T<sub>cu1</sub>=304.78°C. The circulating air flow rate by forced convection is Q<sub>m</sub> = 0.09112 m<sup>-3</sup>·s<sup>-1</sup>. The vertical side walls temperature is T<sub>ple</sub> = 140.6°C and the water temperature and vapor is about 144.6°C in the stockpot. The gas combustion is composed of carbon dioxide (CO<sub>2</sub>), carbon monoxide (CO), methane (CH<sub>4</sub>) and the ratio of hydrogen to nitrogen (H<sub>2</sub>/N<sub>2</sub>). The results from the numerical modeling indicate T<sub>cu1</sub>=307.8°C, T<sub>ple</sub> = 144.55°C and a Q<sub>m</sub> = 0.09258 m<sup>-3</sup>.s<sup>-1</sup>. The average thermal efficiency of the cookstove is η = 46.6% and the power developed by the cookstove is about ≈6 kW. Despite the heat losses, the cookstove remains interesting for paddy rice parboiling activities.展开更多
文摘We present in this paper the results of experimental and numerical study of the thermal performances of a cook stove prototype intended for the parboiling of paddy rice. Thus, the experimental results show that the optimal mass of husk rice is M = 7.15 kg for a good combustion within the combustion chamber and got a maximum temperature at the level of the burners surface. This temperature is T<sub>cu1</sub>=304.78°C. The circulating air flow rate by forced convection is Q<sub>m</sub> = 0.09112 m<sup>-3</sup>·s<sup>-1</sup>. The vertical side walls temperature is T<sub>ple</sub> = 140.6°C and the water temperature and vapor is about 144.6°C in the stockpot. The gas combustion is composed of carbon dioxide (CO<sub>2</sub>), carbon monoxide (CO), methane (CH<sub>4</sub>) and the ratio of hydrogen to nitrogen (H<sub>2</sub>/N<sub>2</sub>). The results from the numerical modeling indicate T<sub>cu1</sub>=307.8°C, T<sub>ple</sub> = 144.55°C and a Q<sub>m</sub> = 0.09258 m<sup>-3</sup>.s<sup>-1</sup>. The average thermal efficiency of the cookstove is η = 46.6% and the power developed by the cookstove is about ≈6 kW. Despite the heat losses, the cookstove remains interesting for paddy rice parboiling activities.
