Sökning: "light emitting diode"

Visar resultat 1 - 5 av 37 uppsatser innehållade orden light emitting diode.

  1. 1. Analysis of energy efficient heat and lighting systems in a subarctic greenhouse

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :William Sigvardsson; [2023]
    Nyckelord :Energy efficiency; Sub-arctic greenhouses; Energy measures; Greenhouse climate control; Greenhouse technology; CFD;

    Sammanfattning : This report studies a subarctic greenhouse located in Nikkala, Sweden called Nikkala handelsträdgård. Through a visit to the greenhouse coupled with the creation of two simulation models this study investigates the differences in energy demand with water-carried and air-carried heating systems, high pressure sodium lights and Light emitting diode lights and insulation in parts of the greenhouse without a active cultivation. LÄS MER

  3. 2. Investigation and evaluation of optical distance sensors

    Uppsats för yrkesexamina på grundnivå, Uppsala universitet/Signaler och system

    Författare :Olof Wigzell; [2022]
    Nyckelord :optics; radiometry; senssor; microcontroller; irradiance; circuit design; calibration; validation;

    Sammanfattning : Optical sensors are among the sensors that are often used for distance measurements. An optical distance sensor is basically made of a light emitter (Tx) such as a light emitting diode (LED), a light receiver (Rx) such as a photosensitive transistor, and a circuit supporting the operation of the Tx and Rx. LÄS MER

  4. 3. Performance Analysis of Li-fi Communication System

    Master-uppsats, Högskolan i Gävle/Avdelningen för byggnadsteknik, energisystem och miljövetenskap

    Författare :Katrun Nada; [2022]
    Nyckelord :;

    Sammanfattning : Li-fi is a promising technology in today’s communication system. It may bringup the many benefits over other communication technologies. Since light isthe main source to provide data, and this is available everywhere around, itmay compete with other technologies that use radio communication. LÄS MER

  5. 4. Optimization of Light Conditions in a Greenhouse Environment : Reducing energy consumption and increasing yield using mechatronics

    Magister-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Elias Mahjoub; [2022]
    Nyckelord :Indoor growing; Light-emitting diode; Mechatronics; Sustainability; Vertical Farming.; Inomhusodling; Lysdiod; Mekatronik; Hållbarhet; Vertikalt Jordbruk;

    Sammanfattning : The present thesis explores the possibilities of reducing electrical energy consumption in a greenhouse environment through the construction a demonstrator system. The demonstrator system is imagined to be used in a vertical farming setup and is fully automated. The system achieves two main actions. LÄS MER

  7. 5. Design of LED setup for measuring tandem solar cell subcell J-V behaviour

    Kandidat-uppsats,

    Författare :Kristina Bergström; Mohammed Nour Kamalmaz; Erik Lindvall; [2022]
    Nyckelord :Tandem solar cell; LED; background light; bias; arduino; processing; subcell;

    Sammanfattning : The need to accurately measure multi-junction (MJ) tandem solar cells' subcell current-voltage characteristics is increasing due to the vital information they provide about the efficiency, stability, and longevity of the cells. These measurements are rather difficult compared to their counterpart single-layer solar cell measurements. LÄS MER