Smart Food Delivery Box with Peltier-Based Cooling and Heating System

Author

Prof. Mangesh R. Shelke, Saksham Lande, Mayuri Maske, Malhar Gore, Ashish Padole, Vansh Gujar


Abstract

 Food that travels from a kitchen to a customer rarely arrives at the temperature at which it left, and insulated boxes can only slow that drift, not correct it. This paper presents the design, construction and testing of a smart food delivery box with two independent zones, a hot zone and a cold zone, each served by Peltier modules. Two NTC thermistors measure the zone temperatures, and an ESP32 microcontroller switches the modules through a ULN2003A driver and a relay stage using hysteresis thresholds that the user can change from a Wi-Fi web dashboard. The dashboard also offers manual relay control, and the readings and relay states are uploaded to the ThingSpeak cloud platform for remote monitoring. Heat sinks and fans carry the rejected heat away, a 12 V, 10 A switched-mode power supply feeds the power circuits, and a 7805 regulator provides the 5 V logic rail. A 16×2 I²C LCD shows both temperatures, the relay status and the operating mode. The insulated enclosure measures 45 cm × 35 cm × 21 cm. A first-order heat-load model gives estimated coefficients of performance of about 0.30 for cooling and 0.41 for heating, and these figures are discussed alongside the results of a baseline Peltier food-box study. The completed prototype was tested for cooling, heating and temperature regulation. The work shows that a compact, quiet and compressor-free unit can hold a hot and a cold zone at once, and it also brings out the power-supply and heat-rejection limits that later versions will need to address.


Keywords

thermoelectric cooler, Peltier module, food delivery, ESP32, NTC thermistor, hysteresis control, IoT monitoring, coefficient of performance.



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References


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