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Boosting Air Handling Unit Efficiency at Global Hotels Chain with LoRaWAN Differential Pressure Sensor

Achieving Energy Efficiency and Net Zero Goals in Hotel Cooling Systems with LoRaWAN Technology

For leading global hotel brands like Intercontinental Hotels, achieving energy efficiency and moving towards net zero emissions are top priorities. A significant part of this effort involves optimizing the performance of air handling units (AHUs), which play a crucial role in maintaining comfortable environments for guests while consuming substantial energy. One of the most overlooked aspects of energy efficiency in cooling systems is the performance of air filters. When air filters in AHUs become clogged, the system must work harder to maintain airflow, driving up energy use and costs.

According to the International Energy Agency (IEA), the hospitality industry accounts for nearly 1% of global emissions, with HVAC systems representing up to 50% of a hotel's energy use. Effective energy monitoring and management can reduce hotel energy consumption by up to 30%, a crucial step in meeting net zero targets and improving operational efficiency.

Intercontinental Hotels was facing this challenge: how to monitor filter performance effectively and ensure optimal system efficiency, without disrupting operations or undergoing costly infrastructure upgrades. The solution came in the form of Ellenex’s PDT2-L differential pressure sensor, paired with LoRaWAN technology, which enables continuous, real-time monitoring of filter performance and easy integration into the hotel’s existing Building Management System (BMS).



Boosting Air Handling Unit Efficiency at Global Hotels Chain with LoRaWAN Differential Pressure Sensor
Boosting Air Handling Unit Efficiency at Global Hotels Chain with LoRaWAN Differential Pressure Sensor

Why Air Filter Performance Monitoring Matters for Hotel Cooling Systems

The air handling units in hotels are responsible for circulating conditioned air throughout guest rooms, lobbies, conference centers, and other public spaces. However, when air filters become clogged, the cooling system’s energy consumption rises significantly as it struggles to maintain proper airflow. This leads to:

  • Increased energy bills due to reduced efficiency

  • Inconsistent cooling in guest areas, impacting comfort

  • Premature wear and tear on equipment, leading to costly repairs

  • Higher carbon emissions, contradicting sustainability goals


By implementing real-time air filter performance monitoring, Intercontinental Hotels can ensure their cooling systems operate at peak efficiency, reducing both energy costs and carbon footprints. This is where the PDT2-L sensor, combined with LoRaWAN technology, offers a smart and cost-effective solution.


LoRaWAN Technology: A Game Changer for Monitoring and Integration

LoRaWAN (Long Range Wide Area Network) is a wireless communication protocol designed for low-power, long-range IoT devices. For large facilities like hotels, this technology offers several advantages over traditional monitoring systems, particularly when integrating with existing Building Management Systems (BMS). Here’s how LoRaWAN helps streamline filter performance monitoring:

  1. Long-Range Coverage for Large Hotel Complexes: LoRaWAN’s long-range capabilities make it ideal for sprawling hotel complexes where air handling units may be located far from the central control system. With LoRaWAN, the PDT2-L sensors can transmit data from AHUs located in different sections of the hotel, across multiple floors, or even in distant wings, all to a central monitoring station.

  2. Low-Power, Low-Maintenance Sensors: The PDT2-L sensor, designed to monitor low-range pressure differentials (up to 500 pascals), consumes very little power thanks to LoRaWAN’s low-power design. These sensors can operate for extended periods on a single battery, significantly reducing maintenance costs and minimizing disruptions. This is especially important for hotels, where minimizing downtime is crucial to maintaining guest satisfaction.

  3. Seamless Integration with Existing BMS: One of the major advantages of LoRaWAN technology is its ability to integrate seamlessly with existing BMS systems without requiring any significant changes to the operational infrastructure. The PDT2-L sensor can be easily retrofitted to monitor pressure drops across air filters, and the data it collects can be transmitted wirelessly to the hotel’s BMS. This allows hotel operators to monitor air filter performance in real time and make data-driven decisions to enhance system efficiency.

  4. Retrofit-Friendly with Minimal Disruption: For older buildings or hotels where AHU systems were not originally designed with advanced monitoring in mind, LoRaWAN offers a retrofit-friendly solution. Because it is wireless, it requires no extensive cabling or structural changes, meaning it can be installed in existing systems with minimal disruption to the hotel’s operations. This makes it an ideal solution for hotels that want to upgrade their monitoring capabilities without the cost and downtime associated with traditional wired systems.

  5. Cost-Effective Solution for Energy Efficiency: Compared to traditional monitoring systems that require extensive wiring and expensive installation, LoRaWAN offers a cost-effective solution. By reducing installation complexity and allowing long-range communication without the need for additional infrastructure, LoRaWAN enables hotels to implement advanced monitoring at a fraction of the cost.


Case Study: Intercontinental Hotels Optimizing AHU Filter Performance with Ellenex’s PDT2-L and LoRaWAN differential pressure sensor

Intercontinental Hotels, known for their commitment to sustainability and guest comfort, faced a challenge common to large hospitality chains: maintaining optimal cooling performance while keeping energy costs down. As part of their drive towards net zero, they sought a way to monitor the pressure drop across air filters in their AHUs, which, when clogged, were driving up energy use and reducing the overall efficiency of the cooling system.

To address this, they partnered with Ellenex to deploy the PDT2-L differential pressure sensors. These sensors were installed to measure the pressure differential across the air filters in each AHU, providing real-time data on filter performance. LoRaWAN technology was used to connect the sensors wirelessly to the hotel’s Building Management System, enabling seamless data transmission over long distances without the need for new cabling or extensive infrastructure changes.

By using LoRaWAN, Intercontinental Hotels was able to:

  • Optimize filter replacement schedules: Rather than relying on time-based filter replacements, the hotel now replaces filters only when necessary, based on actual performance data, reducing waste and maintenance costs.

  • Reduce energy consumption: With clean, efficient filters, the AHUs can operate at optimal performance, reducing the energy required to cool guest rooms and public areas.

  • Achieve sustainability goals: By improving energy efficiency and cutting unnecessary energy use, the hotel is moving closer to its net zero emissions targets.


IP rated battery operated differential pressure sensor to monitor AHU filter performance monitoring
PDT2-L, IP rated battery operated differential pressure sensor to monitor AHU filter performance monitoring

Simplifying Monitoring and BMS Integration with LoRaWAN

The PDT2-L sensor with LoRaWAN technology doesn’t just improve filter performance monitoring—it also simplifies integration into existing Building Management Systems. By wirelessly transmitting data from the sensors to the BMS, hotel operators can gain real-time insights into the performance of their air handling units without the need for complex and costly wiring installations.

Additionally, the flexibility of LoRaWAN means that these sensors can be easily retrofitted into existing systems, making it an ideal solution for hotels looking to improve energy efficiency without undergoing expensive renovations. With low power consumption and the ability to penetrate through walls and floors, LoRaWAN ensures reliable communication across even the largest hotel facilities.


Driving Energy Efficiency and Sustainability with Ellenex’s LoRaWAN Solution

For hotel brands like Intercontinental, where guest comfort and operational efficiency are paramount, Ellenex’s PDT2-L sensor combined with LoRaWAN technology offers a powerful solution to optimize air handling unit performance. By monitoring filter performance in real time and integrating seamlessly with existing BMS systems, this solution helps hotels enhance their energy efficiency, reduce operational costs, and move towards net zero goals.

Whether you’re retrofitting an existing system or implementing new monitoring capabilities, LoRaWAN technology ensures a cost-effective, scalable, and sustainable solution for improving HVAC performance in hotels.


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