Course Content
Energy conservation and energy efficiency -Part 1
This module is designed to equip hospitality engineers with the knowledge and skills necessary to understand the requirements of Energy Conservation and Energy Efficiency within the hospitality industry. It aims to support hotels in fulfilling their brand promises to achieve net-zero emissions by 2050, while providing guidance to help them reach this goal even earlier, by 2040. Key topics may include the importance of sustainable energy practices, assessment of current energy usage, implementation of energy-efficient technologies, and the development of strategies for reducing overall energy consumption. The module emphasizes practical approaches and solutions that can be integrated into hotel operations, thereby enhancing sustainability, lowering costs, and meeting emerging regulatory and consumer demands for environmentally conscious practices
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Energy conservation and energy efficiency module 12 , Energy -Part-1
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Energy conservation and energy efficiency module 12 , Energy -Part-1
Energy conservation and energy efficiency
About Lesson

The lecture you shared delves into the importance of energy efficiency through the use of speed control, specifically variable speed drives (VSDs). Here’s a brief summary of the key points discussed:

1. **Motor Operation**: Many motors operate at a constant speed, leading to energy waste when adjusting output via mechanical means (e.g., dampers for fans or valves for pumps). This inefficiency can be resolved through speed control.

2. **Affinity Laws**: The flow is proportional to shaft speed, pressure to the square of the speed, and power to the cube of the speed. This demonstrates how even small reductions in motor speed can result in significant energy savings. For example, halving the shaft speed reduces power consumption to 1/8th of its original value.

3. **Benefits of VSDs**: Using VSDs allows for smoother starting and stopping of motors, avoids in-rush currents, and provides better control of the motor speed, leading to significant energy savings. VSDs are particularly useful in applications such as pumps, fans, elevators, and conveyors.

4. **Motor Starting Methods**:
– **Direct Online (DOL)**: Simple but can cause large inrush currents and mechanical stress.
– **Star-Delta**: Reduces starting current but doesn’t offer complete control.
– **Soft Starters**: Provide smoother starts but don’t offer energy savings.
– **VSDs**: Offer energy savings and better control compared to the above methods.

5. **Energy Savings Example**: For applications like fans and pumps, using VSDs instead of mechanical methods (like dampers or valves) can lead to significant energy savings, sometimes as much as 70%. For instance, with 80% flow, a motor using a damper consumes nearly full power, while a VSD-equipped motor consumes only 50% of the power.

6. **Real-World Applications**: The video also highlights practical uses of VSDs in various systems, such as bottle conveyors, lift control panels, escalators, and water distribution systems. These systems benefit from smoother operation, better load control, and significant energy savings.

Overall, the video illustrates how adopting VSDs in motor-driven systems can drastically reduce energy consumption, extend equipment life, and improve operational efficiency.

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HOSPITALITY ENGINEERING