EPS@ISEP | The European Project Semester (EPS) at ISEP

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report [2019/06/23 15:45] – [3.10 Sprint Outcomes] team2report [2019/06/26 18:54] (current) – [7.6 Tests and Results] team2
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 In Figure {{ref>solidworksmodel}}, some renders from the SolidWorks model are proposed. In Figure {{ref>solidworksmodel}}, some renders from the SolidWorks model are proposed.
  
-At the bottom are some sloping holes where the fresh air can enter the solar catcher. +At the bottom are some holes with slopes where the fresh air can enter the solar catcher. 
 After this, the solar catcher heats the fresh air. The transparent front plate is bent for over 180°. This way, the Sun shines on the solar catcher during the whole day without a rotation system. After this, the solar catcher heats the fresh air. The transparent front plate is bent for over 180°. This way, the Sun shines on the solar catcher during the whole day without a rotation system.
 The warm air will rise to the top. The form is conical upwards to increase the airspeed as compensation for the reduced temperature at the top.  The warm air will rise to the top. The form is conical upwards to increase the airspeed as compensation for the reduced temperature at the top. 
-The chimney is provided sloping holes so the warm air can escape but the rain can’t come in. +The chimney is also provided with holes with slopes so that the warm air can escape but the rain can’t come in.
  
 <WRAP centeralign> <WRAP centeralign>
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 </WRAP> </WRAP>
  
-On Figure {{ref>trays}}, it is visible that the solar dehydrator has four trays. In total, there is a space of 5 cm by 5 cm to place the fresh food to dehydrate. +On Figure {{ref>trays}}, it is visible that the solar dehydrator has four trays. In total, there is a space of 50 cm by 50 cm to place the fresh food to dehydrate. 
 They are made out of wood and a metal mesh.  They are made out of wood and a metal mesh. 
 Through a hinged door, it is easy to place the food on the trays. Through a hinged door, it is easy to place the food on the trays.
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 </WRAP> </WRAP>
  
-Figure {{ref>fandetail}} gives a detailed view of the fan. Through the closing lid, pushed by a servo motor, the air flow is optimized. The position of the servo motor depends on the humidity and temperature inside the cabinet. These two parameters are measured by sensors. This controlling system, in combination with the fan, ensure the optimal conditions to dehydrate the food.+Figure {{ref>fandetail}} gives a detailed view of the fan. Through the closing lid, pushed by a servo motor, the air flow is optimized. The servo motor is turned on or off depending on the humidity and temperature inside the cabinet. These two parameters are measured by sensors. This controlling system, in combination with the fan, ensure the optimal conditions to dehydrate the food.
  
 <WRAP centeralign> <WRAP centeralign>
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 ³ = while turning, with a delay of 20 ms per 1° angle (most power efficient) ³ = while turning, with a delay of 20 ms per 1° angle (most power efficient)
  
-When knowing that the total calculated power consumption of the device will be roughly about 1.65 W, you can calculate the total run time of the device during the night. So when no power comes from the solar panel the battery can provide power to the DryFoo for roughly 5 and a half hours. This is calculated by dividing the power consumption by the battery voltage to get the discharge current needed from the battery. By dividing the nominal capacity of 2400 mAh with the discharge current of 430 mA, the time will roughly be 5.48 hours. +When knowing that the total calculated power consumption of the device will be roughly about 1.65 W, the total running time of the device during the night can be calculated. So, when no power comes from the solar panel the battery can provide power to the DryFoo for roughly 5 and a half hours. This is calculated by dividing the power consumption by the battery voltage to get the discharge current needed from the battery. By dividing the nominal capacity of 2400 mAh with the discharge current of 430 mA, the time will roughly be 5.48 hours. This is calculated with both the servo motor and the fan running constantly.
  
 ==== - Functionalities ==== ==== - Functionalities ====
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 </WRAP> </WRAP>
  
 +The team tested the prototype by inserting food to dehydrate. Figure {{ref>foodbefore}} shows the state of the different food before starting the dehydrating process.
 +
 +<WRAP centeralign>
 +<figure foodbefore>
 +{{ :testfoodbefore.jpg?direct&250 |}}
 +<caption>Food before drying</caption>
 +</figure>
 +</WRAP>
 +
 +Figure {{ref>foodafter}} shows their status after approximately seven hours.
 +
 +<WRAP centeralign>
 +<figure foodafter>
 +{{ :testfoodafter.png?direct&700 |}}
 +<caption>Food after drying seven hours</caption>
 +</figure>
 +</WRAP>
 +
 +Besides the kiwi, all other types of food tested showed visible signs of dehydration. In the case of the cherries, mushroom, and bananas, these signs were significant. In the case of the apples, the drying process is about half-way done, as expected, according to Table {{ref>typeoffood}}. The reason the kiwi hadn't yet shown much change is due to the fact that kiwi is made at 83 % of water.
 ==== - Conclusion ==== ==== - Conclusion ====
  
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   * Internet of Things: allowing the user to be connected and to control the dehydrator at any time and from anywhere.   * Internet of Things: allowing the user to be connected and to control the dehydrator at any time and from anywhere.
   * Rotating system: having the system rotate according to the radiation of the Sun, to always catch the maximum amount of sunlight.   * Rotating system: having the system rotate according to the radiation of the Sun, to always catch the maximum amount of sunlight.
 +  * Increasing the angle of the solar heat catcher to increase solar energy capture.
 +  * Touchscreen instead of LCD and buttons as the user interface.
 +  * Maritime plywood for the straight parts of the product for being definitely waterproof.
 +  * higher precision components, low power fan,arduino nano (lower power consumption)
 ===== Appendices ===== ===== Appendices =====
 === 1. Sponge Experiment === === 1. Sponge Experiment ===

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