different values. The thermal testing asks for the maximum temperature, the width of the sample you want to test, and then it displays the internal and outer temperature while the test is running. When the test is complete, it will display Complete” and then show the K and R value. “Test Heat Transfer Model To properly assume one dimensional heat transfer with minimal errors, a cylindrical model would be utilized. The overall objective is to determine the k value (thermal conductivity) of the biochar cement cylinder to quantify its insulation abilities. To do this, an electric heater will be placed in the center of an aluminum cylinder, with the top and bottom thermally insulated, to ensure that uniformly heat power is applied. The model will then be calculated backwards for (thermal k conductivity) and R (thermal resistance). In this case, the refrigeration system can be eliminated thereby resulting in decreased complexity and cost while producing a scientific result simultaneously. In order to experimentally determine the and values, the following mathematical model is k R used: Q = Total Heat Transfer (heat supplied) L = Length of the cylinder k = Thermal conductivity R = Thermal Resistance T1 = Inner Temperature r1 = Inner Radius T2 = Outer Temperature r2 = Outer Radius Humidity Analysis Model In quantifying biochar as a housing material, its capabilities of controlling varying humidity levels in the ambient air needed to be tested. The most appropriate model to ensure uniform modelling was a half sphere with a uniform thickness. Testing Test Plan In testing the overall system, subsystems were tested first for feasibility and general usability. The components tested included: the Microcontroller (S1) and its ability to hold data (S2), the interface and corresponding buttons to control it (S3), the humidifier (S4), the fan and airflow production (S5), the heater (S11), temperature and humidity sensors (S6, S7), a calibration test for thermal conductivity (S8), overall thermal conductivity of biochar (S9), and a humidity test on biochar (S10). Please trial to , go to System Build and Test” and refer to the link for an overview “Integrated of the test plan. Procedure for Testing System
different values. The thermal testing asks for the maximum temperature, the width of the sample you want to test, and then it displays the internal and outer temperature while the test is running. When the test is complete, it will display “Test Complete” and then show the K and R value. Heat Transfer Model To properly assume one dimensional heat transfer with minimal errors, a cylindrical model would be utilized. The overall objective is to determine the k value (thermal conductivity) of the biochar cement cylinder to quantify its insulation abilities. To do this, an electric heater will be placed in the center of an aluminum cylinder, with the top and bottom thermally insulated, to ensure that uniformly heat power is applied. The model will then be calculated backwards for k (thermal conductivity) and R (thermal resistance). In this case, the refrigeration system can be eliminated thereby resulting in decreased complexity and cost while producing a scientific result simultaneously. In order to experimentally determine the k and R values, the following mathematical model is used: Q = Total Heat Transfer (heat supplied) L = Length of the cylinder k = Thermal conductivity R = Thermal Resistance T1 = Inner Temperature r1 = Inner Radius T2 = Outer Temperature r2 = Outer Radius Humidity Analysis Model In quantifying biochar as a housing material, its capabilities of controlling varying humidity levels in the ambient air needed to be tested. The most appropriate model to ensure uniform modelling was a half sphere with a uniform thickness. Testing Test Plan In testing the overall system, subsystems were tested first for feasibility and general usability. The components tested included: the Microcontroller (S1) and its ability to hold data (S2), the interface and corresponding buttons to control it (S3), the humidifier (S4), the fan and airflow production (S5), the heater (S11), temperature and humidity sensors (S6, S7), a calibration test for thermal conductivity (S8), overall thermal conductivity of biochar (S9), and a humidity test on biochar (S10). Please to , go to “Integrated System Build and Test” and refer to the link for an overview of the test plan. Procedure for Testing System trial
P16486_PaperPart2.docx