# US 9,752,815 B2 · Method of controlling heat source-side heat exchanger fan, and air conditioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,815 B2 - Document ID: US9752815B2 - Status: Granted - Kind: B2 - Application number: 13/698,014 - Filed: 2011-05-19 - Published: 2013-03-14 - Granted: 2017-09-05 - Earliest claimed: 2010-05-24 - Assignees: Daikin Industries, Ltd. - Applicants: Masashi Saitou; Junichi Shimoda; Tatsuya Makino - Inventors: Masashi Saitou; Junichi Shimoda; Tatsuya Makino - Web page: https://patentgrep.com/patent/US9752815B2 ## CPC - F25D 17/06: by forced circulation - 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 - F24F 11/63: Electronic processing - F24F 11/77: by controlling the speed of ventilators - F24F 11/871: by controlling outdoor fans - F25B 49/027: {Condenser control arrangements} - H05K 7/20836: {Thermal management, e.g. server temperature control} - F24F 2110/10: Temperature - F24F 2140/00: Control inputs relating to system states - F24F 2140/12: Heat-exchange fluid pressure - F25B 13/00: Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) - F25B 2313/02741: using one four-way valve - F25B 2313/0294: related to the outdoor fan, e.g. controlling speed - F25B 2313/0315: Temperature sensors near the outdoor heat exchanger - F25B 2500/19: Calculation of parameters - F25B 2700/1931: Discharge pressures - F25B 2700/2106: of fresh outdoor air - Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating - F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B) - 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) - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A heat source-side heat exchanger fan blowing air to a heat source-side heat exchanger performing heat exchange with refrigerant compressed in a compressor is controlled. A current detected temperature at a current time is converted to obtain a current converted high pressure value at the current time. The current converted high pressure is a pressure of refrigerant inside a high pressure-side pipe of the compressor. The current detected temperature is a temperature detected by a temperature detector attached to the heat source-side heat exchanger. A past detected temperature is converted to obtain a past converted high pressure value at the past time. A speed of the heat source-side heat exchanger fan is determined using a corrected converted high pressure value. The corrected converted high pressure value is obtained by correcting the current converted high pressure value based on the past converted high pressure value. ## Claims ### Claim 1 A method of controlling a heat source-side heat exchanger fan blowing air to a heat source-side heat exchanger performing heat exchange with refrigerant compressed in a compressor, the method comprising: converting a current detected temperature at a current time to obtain a current converted high pressure value at the current time, the current converted high pressure being a pressure of refrigerant inside a high pressure-side pipe of the compressor, and the current detected temperature being a temperature detected by a temperature detector attached to the heat source-side heat exchanger; converting a past detected temperature detected by the temperature detector at a past time before the current time to obtain a past converted high pressure value at the past time, the past converted high pressure being a pressure of the refrigerant inside the high pressure-side pipe; detecting an outdoor temperature of outdoor air that is an air-blowing target of the heat source-side heat exchanger fan; and determining whether the outdoor temperature is in a first temperature region or a second temperature region higher than the first temperature region, when the outdoor temperature is determined to be in the first temperature region, a corrected converted high pressure value being used to determine the speed of the heat source-side heat exchanger fan, the corrected converted high pressure value being obtained by obtaining a rate of change of the current converted high pressure value near the current time from the current converted high pressure value and the past converted high pressure value, and adding a product of the rate of change and a correction coefficient to the current converted high pressure value, and when the outdoor temperature is determined to be in the second temperature region, the current converted high pressure value being used instead of the corrected converted high pressure value to determine the speed of the heat source-side heat exchanger fan. ### Claim 2 (depends on 1) The heat source-side heat exchanger fan control method according to claim 1, wherein the rate of change of the current converted high pressure value is obtained by dividing a difference between the current converted high pressure value and the past converted high pressure value by an amount of elapsed time from the past time to the current time. ### Claim 3 (depends on 2) The heat source-side heat exchanger fan control method according to claim 2, wherein the amount of elapsed time is set to a constant value between 2 seconds and 10 seconds. ### Claim 4 (depends on 1) The heat source-side heat exchanger fan control method according to claim 1, wherein the corrected converted high pressure value closer to an actual pressure than the current converted high pressure value is used to determine the speed of the heat source-side heat exchanger fan.