- Local Authority Approval
- The formal consent granted by regional government bodies to conduct specific industrial activities or building modifications. Securing this approval is a necessary prerequisite to ensure local compliance with zoning and environmental health regulations.
- Local Edge Gateway
- A physical hardware device or software program that aggregates, processes, and filters data locally at the machine level before transmitting it to the cloud. This reduces latency, saves bandwidth, and improves security for real-time industrial monitoring.
- Local Edge Gateways
- Hardware devices situated close to physical machinery that aggregate, filter, and securely transmit local sensor data to centralized databases or cloud platforms. They reduce data latency and insulate critical thermal control loops from wider corporate networks.
- Local Outlier Factor
- Local Outlier Factor (LOF) is an unsupervised anomaly detection algorithm that identifies data points with a significantly lower density than their neighbors. In process engineering, it is used to detect subtle, localized deviations in sensor data that signal early-stage equipment degradation or process drift.
- Local Store And Forward
- A data buffering method where edge devices temporarily store process data during network outages and transmit it once connectivity is restored. It ensures data integrity and prevents loss of critical operational history in industrial monitoring systems.
- Location Based Method
- A carbon accounting methodology that calculates Scope 2 emissions based on the average grid emission intensity of the physical location where electricity is consumed. This helps industrial operators understand the actual physical impact of their local energy grid on operations.
- Location-Based Method
- A greenhouse gas accounting method that calculates Scope 2 emissions based on the average emissions intensity of the local grid where the energy is physically consumed. This method provides industrial facilities with an accurate reflection of the actual physical grid emissions associated with their geographic operations.
- Logarithmic Mean Temperature Difference
- A mathematical formulation used to determine the temperature driving force for heat transfer in flow systems, particularly in heat exchangers. It allows engineers to accurately size heat transfer equipment by accounting for non-linear temperature profiles along the length of the exchanger.
- Logical Unidirectionality
- The use of software configurations and firewalls to restrict data transmission to one direction. It allows thermal engineers to safely export real-time sensor data to corporate networks without exposing the physical control systems to inbound attacks.
- Long-Term Cyclic Capacity
- The ability of an energy storage system to undergo thousands of charge and discharge cycles without significant degradation in performance. For concrete storage, high cyclic capacity ensures a decades-long operational lifespan aligned with infrastructure durability.
- Long-Wave Thermal Radiation
- Electromagnetic radiation in the infrared spectrum emitted by the Earth and warm objects back into the atmosphere. Managing long-wave emission is critical for optimizing radiative cooling systems and preventing heat accumulation in industrial structural envelopes.
- Loop Breaking
- The systematic elimination of closed heat-load loops within a heat exchanger network design. This process reduces network complexity and capital cost by removing redundant exchangers, though it may slightly increase utility consumption.
- Loop Breaking Techniques
- Systematic methods used to simplify heat exchanger networks by identifying and eliminating closed loops of heat load. This process helps engineers trade off minor energy savings for a simpler, less expensive, and more operable network design.
- Loss On Ignition
- A test used to measure the weight loss of a sample after heating it to a high temperature to burn off volatile and organic compounds. In waste-to-energy plants, it is used to assess the efficiency of the combustion process and the quality of the resulting ash.
- Low Carbon Technologies
- Equipment, processes, or systems—such as industrial heat pumps and electric steam generators—that produce significantly fewer greenhouse gas emissions than traditional fossil-fuel-based systems. Implementing these technologies is the primary pathway for industrial facilities to transition toward net-zero operations.
- Low Pressure Carburising
- A vacuum heat-treatment process where carbon is introduced into the surface of a steel component at low pressures to increase surface hardness and wear resistance. This method reduces thermal distortion and eliminates intergranular oxidation compared to conventional gas carburizing.
- Low Temperature Range
- Typically defined as temperatures below 120°C (248°F), this range contains low-grade waste heat often used for district heating, feed preheating, or absorption cooling. Utilizing this range is vital for reducing a facility's primary fuel consumption and carbon footprint.
- Low-Carbon Technology
- A class of industrial technologies designed to significantly minimize or eliminate greenhouse gas emissions compared to standard fossil-fuel systems. In industrial thermal engineering, adopting these technologies—such as waste heat recovery and electrification—is vital for meeting regulatory decarbonization standards and reducing operational carbon footprints.
- Low-NOx Burners
- Specialized industrial burners engineered to control fuel-air mixing and flame temperature, thereby minimizing the formation of thermal nitrogen oxides. They are essential for meeting stringent environmental regulatory limits on air pollutants.
- Low-Pass Butterworth Filter
- A signal processing filter designed to have a flat frequency response in the passband, blocking high-frequency noise. It is used to clean up industrial sensor readings, ensuring stable and reliable input data for control algorithms.
- Low-Pressure Carburising
- A vacuum heat treatment process that diffuses carbon into the surface layer of steel parts to increase hardness and wear resistance. This technique is critical for producing high-strength components with minimal thermal distortion.
- Low-Temperature Accumulator
- A storage vessel that holds cool or lower-temperature fluid within a thermal energy storage system. It acts as a sink to receive returned fluid after heat extraction, ensuring balanced fluid inventory and consistent source temperatures for heat pumps.
- Lower Explosive Limit
- The Lower Explosive Limit (LEL) is the minimum concentration of a flammable vapor or gas in air that can ignite in the presence of an ignition source. Monitoring LEL in industrial ducts and oxidizers is critical to preventing catastrophic explosions by keeping concentrations well below explosive levels.
- Lunar Regolith
- The layer of loose, fragmented rock and dust covering the bedrock of the Moon, which contains significant deposits of Helium-3 from the solar wind. It is highly valued as a potential resource for future, clean aneutronic fusion reactors.