Lennox International patented a method to prevent evaporator coil freeze in HVAC systems by adjusting compressor speed based on sensor data. The system operates in reheat dehumidification mode, ensuring efficient and reliable performance. GlobalData’s report on Lennox International gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Lennox International, was a key innovation area identified from patents. Lennox International's grant share as of February 2024 was 66%. Grant share is based on the ratio of number of grants to total number of patents.

Preventing evaporator coil freeze in hvac system

Source: United States Patent and Trademark Office (USPTO). Credit: Lennox International Inc

A recently granted patent (Publication Number: US11927362B2) discloses a method and system for preventing evaporator coil freeze in a heating, ventilation, and air conditioning (HVAC) system operating in re-heat dehumidification mode. The method involves determining a reference saturated suction temperature (SST) using sensors on the evaporator coil and adjusting the compressor speed based on the reference SST to prevent freezing. The system includes a controller coupled to the compressor, which modulates the compressor speed based on the reference SST to maintain optimal operation.

The patented method further includes determining whether the HVAC system is in re-heat dehumidification mode and adjusting the compressor speed accordingly. By utilizing multiple sensors on the evaporator coil and assigning them to different compressors, the system can effectively prevent evaporator coil freeze by dynamically adjusting the compressor speed based on the reference SST. This innovative approach ensures efficient operation of the HVAC system while avoiding potential issues associated with evaporator coil freeze.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.