DEPARTMENT OF MECHANICAL ENGINEERING

  1. Introduction HVAC stands for Heating, Ventilation, and Air Conditioning . It is a technology used to maintain thermal comfort, indoor air quality (IAQ), and humidity control in residential, commercial, and industrial buildings. HVAC systems play a vital role in homes, hospitals, industries, schools, shopping malls, and automobiles. Without HVAC, modern living and working environments would be uncomfortable and unhealthy. 2. Basic Functions of HVAC An HVAC system performs three primary functions: 1. Heating Provides warmth during cold weather using: Furnaces Boilers Heat pumps Electric heaters 2. Ventilation Controls air circulation by: Removing stale air Supplying fresh outdoor air Eliminating pollutants Controlling moisture levels 3. Air Conditioning Maintains comfortable indoor temperature by: Removing heat from indoor air Controlling humidity Filtering dust and contaminants 3. Working Principle of HVAC System A. Heating System Working Heating systems operate using: Combus...

  1. Introduction Regenerative braking is an energy recovery mechanism used in Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs) . Unlike conventional vehicles, where braking energy is wasted as heat, EVs convert part of the vehicle’s kinetic energy back into electrical energy and store it in the battery. This improves: Energy efficiency Driving range Battery utilization Overall vehicle performance 2. Conventional Braking vs Regenerative Braking Conventional Braking System In Internal Combustion Engine (ICE) vehicles: When the driver presses the brake pedal, brake pads press against the disc. Kinetic energy → Converted into heat energy. Energy is completely wasted. This is known as friction braking . Regenerative Braking System In EVs: The electric motor operates in reverse mode. Kinetic energy → Converted into electrical energy. Energy is stored in the battery. 3. Working Principle of Regenerative Braking The principle is ...

  AI Glass What Are AI Glasses? AI glasses are wearable devices like Xreal Air or Vuzix Blade that use augmented reality (AR) displays, cameras, AI processors, and voice interfaces to deliver contextual data. They process inputs via onboard AI (e.g., similar to GPT models) for object recognition, measurements, and simulations without needing a separate computer. Polytechnic students can use them affordably with apps like Google Lens or custom AR software for mechanical tasks. ​ Key Features for Mechanical Students Real-Time Measurements : Scan parts with built-in cameras for instant dimensions, tolerances, and 3D models—ideal for reverse engineering projects using tools like Geomagic or Fusion 360 integration. AR Overlays : Visualize CAD assemblies (e.g., SOLIDWORKS models) superimposed on physical prototypes, aiding assembly verification and stress analysis demos. AI Guidance : Voice-activated tutorials for CNC programming, 3D printing setups, or IoT sensor troubleshooting during ...

  Turbochargers: Working Principle and Applications 1. Introduction A turbocharger is a forced-induction device used in internal combustion engines to increase engine power and efficiency. It works by using waste exhaust gas energy to compress the intake air supplied to the engine. By supplying more air (oxygen) into the combustion chamber, more fuel can be burned, resulting in higher power output without increasing engine size . Turbochargers are widely used in automobiles, marine engines, aircraft engines, locomotives, and power plants . 2. Need for Turbocharging In naturally aspirated engines: Only atmospheric pressure fills the cylinder Power output is limited by air density Efficiency drops at high altitudes Turbocharging helps to: Increase engine power Improve fuel efficiency Reduce emissions Compensate for altitude losses Enable engine downsizing   3. Main Components of a Turbocharger 1. Turbine Located on the...