Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), Building Energy and Environment Group, Barcelona, Spain.
Bioresour Technol. 2012 Nov;124:259-68. doi: 10.1016/j.biortech.2012.08.019. Epub 2012 Aug 14.
A cold climate, low cost, tubular digester is monitored and temperatures from different parts of the slurry, greenhouse, and adobe walls are presented, discussing the thermal performance of the digester. The slurry exhibits a vertical gradient of 6°C, with a mean value of 24.5°C, while the ambient temperature varies from 10°C to 30°C, showing the efficiency of the system as a solar heat collector with thermal inertia. A simple time-dependent thermal model is developed using inputs of solar radiation, wind velocity, ambient temperature, and digester geometry. The model outputs include temperatures of the slurry, the biogas, its holding membrane and the greenhouse air, wall and cover. Radiative, convective and conductive heat transfer phenomena are considered between all system elements. The model has 0.47°C (2%) standard error for the average slurry temperature. This model can be used to predict the influence of geometry and materials on the performance of the digester.
寒冷气候、低成本、管状沼气池得到了监测，展示了来自不同部分的浆料、温室和土坯墙的温度，讨论了沼气池的热性能。浆料呈现出 6°C 的垂直梯度，平均值为 24.5°C，而环境温度在 10°C 到 30°C 之间变化，显示出该系统作为太阳能集热器的效率具有热惯性。使用太阳能辐射、风速、环境温度和沼气池几何形状等输入参数，开发了一个简单的时变热模型。模型输出包括浆料温度、沼气、其保持膜以及温室空气、墙壁和覆盖物的温度。考虑了所有系统元件之间的辐射、对流和传导传热现象。该模型对平均浆料温度的标准误差为 0.47°C（2%）。该模型可用于预测几何形状和材料对沼气池性能的影响。
