# US 10,871,107 B2 · Method of running an air inlet system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,107 B2 - Document ID: US10871107B2 - Status: Granted - Kind: B2 - Application number: 15/738,974 - Filed: 2016-06-23 - Published: 2018-11-08 - Granted: 2020-12-22 - Earliest claimed: 2015-06-24 - Assignees: Aaf Ltd. - Applicants: AAF Ltd - Inventors: Charles Melvin Owen - Web page: https://patentgrep.com/patent/US10871107B2 ## CPC - F02C 7/057: Control or regulation (conjointly with fuel supply control F02C9/50, with nozzle area control F02K1/16) - F02C 7/052: with dust-separation devices - F02C 7/1435: {by water injection} - F24F 5/0035: {using evaporation} - F24F 11/30: for purposes related to the operation of the system, e.g. for safety or monitoring - F24F 11/46: Improving electric energy efficiency or saving - F01P 7/167: {by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed} - F01P 2070/04: using electrical heating elements - F05D 2270/16: to control water or steam injection - F05D 2270/3015: differential pressure - F05D 2270/311: Air humidity - G05D 23/30: Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature - G05D 23/32: with provision for adjustment of the effect of the auxiliary heating device, e.g. a function of time - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES ## Abstract The present embodiments disclose a method of running an air inlet system upstream of one or more inlet air filters of a device protected by air filtration, wherein the method comprises: regulating the relative air humidity of the inlet air at the one or more inlet air filters in dependence of the inlet air filters differential pressure. ## Claims ### Claim 1 A method of running an air inlet of a device protected by air filtration, wherein the relative air humidity is set by means of a cooling system, wherein the cooling system includes two cooling stages, wherein the first cooling stage of the cooling system comprises a first stage fogging system upstream of one or more inlet air filters that provides inlet air cooling, and wherein the second cooling stage of the cooling system comprises a second stage fogging system downstream of the one or more inlet air filters that provides supplemental cooling to the first stage fogging system, wherein the method comprises: regulating the relative air humidity of the inlet air by the first stage fogging system at the one or more inlet air filters in dependence of the differential pressure of the respective inlet air filter, and regulating supplemental cooling by the second stage fogging system to the wet bulb temperature of the inlet air. ### Claim 2 (depends on 1) The method of claim 1, wherein the relative air humidity of the inlet air by the first stage fogging system is set to between 70% and 90%. ### Claim 3 (depends on 2) The method of claim 2, wherein the relative air humidity of the inlet air by the first stage fogging system is set to about 80%. ### Claim 4 (depends on 1) The method of claim 1, wherein the cooling system includes an evaporative cooling system. ### Claim 5 (depends on 4) The method of claim 4, wherein the evaporative cooling system includes a fogging system. ### Claim 6 (depends on 5) The method of claim 5, wherein the fogging system includes at least one rotary atomiser. ### Claim 7 (depends on 1) The method of claim 1, wherein the second cooling stage regulates the relative air humidity to be about 100%. ### Claim 8 (depends on 1) The method of claim 1, wherein the relative air humidity of the inlet air by the first stage fogging system is set by means of a heating system. ### Claim 9 (depends on 8) The method of claim 8, wherein the heating system provides heat by means of warm air delivered into the inlet air. ### Claim 10 (depends on 9) The method of claim 9, wherein the warm air includes compressor bleed air. ### Claim 11 (depends on 9) The method of claim 9, wherein the warm air includes exhaust air of a turbine enclosure. ### Claim 12 (depends on 9) The method of claim 9, wherein the warm air includes turbine exhaust air. ### Claim 13 (depends on 8) The method of claim 8, wherein the heating system provides heat by means of a heater. ### Claim 14 (depends on 1) The method of claim 1, wherein the device is selected from a group consisting of a gas turbine, diesel engine, process blower, other motive force, general ventilation, or clean room. ### Claim 15 A system for reducing inlet air temperature of a device protected by air filtration by means of one or more inlet air filters, comprising: a cooling system including two cooling stages, wherein the first cooling stage of the cooling system comprises a first stage fogging system upstream of one or more inlet air filters that provides inlet air cooling, wherein a first control system controls cooling at the one or more inlet air filters in dependence of the inlet air filters differential pressure to achieve a set relative humidity of the inlet air; and wherein the second cooling stage of the cooling system comprises a second stage fogging system downstream of the one or more inlet air filters that provides supplemental cooling to the first stage fogging system, wherein a second control system controls supplemental cooling to the wet bulb temperature of the inlet air. ### Claim 16 (depends on 2) The method of claim 2, wherein the relative air humidity of the inlet air by the first stage fogging system is set to between 75% and 85%. ### Claim 17 (depends on 11) The method of claim 11, wherein the motive device enclosure comprises a turbine enclosure. ### Claim 18 (depends on 13) The method of claim 13, wherein the heater comprises an electrical heater or a burner.