Abstract: A first module for a fluid cooling system may have a control unit, a first communication unit, a pump for a cooling fluid, and a first heat exchanger. The first communication unit may be configured to receive signals from at least one second module, the signals having an identification feature of the second module. The control unit, on the basis of the identification feature, is designed for identifying the second module, checking whether the second module is system-compatible or authorized, and switching on the pump and/or the first heat exchanger depending on the presence of the system-compatible or authorized second module. A cooling fluid system may have the first module and a second module.

Abstract: Systems and methods for cooling a datacenter are disclosed. In at least one embodiment, a first three-way flow controller is associated with a single-phase fluid and a second three-way flow controller is associated with a two-phase fluid, with a first three-way flow controller to enable a first flow path of a single-phase fluid from a coolant distribution unit to a cold plate or to enable a second flow path to a heat exchanger to cool a two-phase fluid to be used in a cold plate, and with a second three-way flow controller to enable a third flow path of a two-phase fluid to a cold plate or to enable a fourth flow path to a heat exchanger.

Abstract: Disclosed is an immersed cabinet, which includes a cabinet body and a heat sink assembly, wherein the heat sink assembly is in sealed connection with the cabinet body and configured to seal an opening of the cabinet body. The cabinet body accommodates a plurality of devices to be cooled, and cooling liquid is put in the cabinet body and used for immersing the plurality of devices to be cooled. The cooling liquid absorbs heat generated by the plurality of devices to be cooled and then is vaporized. The heat sink assembly exchanges heat with the vaporized cooling liquid, so that the vaporized cooling liquid condenses and flows back to the cabinet body for circulation, and the heat sink assembly dissipates the heat into the atmosphere. Therefore, the heat dissipation structure design of the immersed cabinet is effectively simplified.

Abstract: Systems and methods for rack-based management of leaks in liquid cooled Information Handling Systems (IHSs) are described. In an illustrative, non-limiting embodiment, an IHS configured as head node of a rack may include a processor and a memory coupled to the processor, the memory having program instructions stored thereon that, upon execution, cause the IHS to: receive an indication of a leak from a compute node; identify a location of the compute node in the rack; and respond to the indication based, at least in part, upon the location.

Abstract: A sensor assembly including a housing having an inlet an outlet and an interior space generally closed from an environment external to the sensor assembly. The interior space of the housing can include an inlet zone, a central zone and an outlet zone. A baffle can be disposed within the central zone of the interior space of the housing and be located between the inlet zone and the outlet zone and nearer to the inlet zone than to the outlet zone. The baffle can extend downwardly from an upper side of the housing. A gas sensor that can be operable to detect a presence of a lower GWP refrigerant can be disposed in the outlet zone of the interior space of the housing. The housing includes a door in a lower side of the housing in the central zone of the housing.

Abstract: In one aspect, a heat exchanger system is provided that includes a cooling system and a sensor configured to detect a variable of the cooling system. The heat exchanger system includes processor circuitry configured to provide the variable and a plurality of potential operating parameters of the cooling system to a machine learning model representative of the cooling system to estimate at least one of energy consumption, water usage, and chemical usage for the potential operating parameters. The processor circuitry is further configured to determine, based at least in part on the estimated at least one of energy consumption, water usage, and chemical consumption, for the potential operating parameters, an optimal operating parameter of the cooling system to satisfy a target optimization criterion.

Abstract: An air conditioning system has: an indoor fan that sends air into a room through an air-blowing flow path; a heat pump unit that air-conditions the room with a vapor compression refrigerant circuit; and a separate heat source unit that air-conditions the room with a furnace that heats air by burning fuel or an electric heater that heats air with heat generated by energization. As a refrigerant, a flammable refrigerant is sealed in the refrigerant circuit. A controller controls an operation of the indoor fan, the heat pump unit, and the separate heat source unit. When starting air conditioning in the room with the separate heat source unit, the controller brings a state where the indoor fan is in operation before causing an operation for burning fuel in the furnace.

Abstract: The disclosure provides a system, for designing and developing immersion cooling in data centers. The system includes multiple aisles that perform different functions. One of the aisles includes space for housing immersion tanks in which components of the data center may be positioned to be cooled. A second aisle allows the immersion tanks to be placed in the other aisle and for backside access. A third aisle transfers vapor from the aisle housing the immersion tanks to a vapor return unit to condense the vapor. A distribution unit distributes the coolant to cool the components of the data center is designed at the second aisle. The aisles and other units can be modularized to allow for deployment to meet different types of data center requirements.

Abstract: A portable display apparatus for conveying vehicle-related information using thermal and haptic touch is provided. The portable display apparatus includes circuitry communicatively coupled to a temperature control unit of the portable display apparatus. The circuitry receives from one or more first sensors associated with a vehicle, first temperature information associated with an interior space of the vehicle or an ambient environment of the vehicle and determines a temperature setting based on received first temperature information. The circuitry detects a physical-contact between the portable display apparatus and one of a skin portion or a cloth portion worn by a user. Thereafter, the circuitry controls the temperature control unit based on the determined temperature setting and the detected physical-contact.

Abstract: A vehicle communication system includes an optical cable, a centralized hub device, and an antenna hub device. The centralized hub device is connected to a first end of the optical cable and is configured to receive radio frequency (RF) signals from multiple end devices. The centralized hub device is configured to convert the RF signals to respective optical carrier signals and transmit the optical carrier signals along the optical cable at different, non-overlapping wavelength bands of a combined optical signal. The antenna hub device is connected to a second end of the optical cable. The antenna hub device is configured to receive the combined optical signal and to convert the optical carrier signals thereof to RF signals, amplify the RF signals, and transmit the RF signals to one or more antennas.

Abstract: In one aspect, a heat exchanger system is provided that includes a cooling system and a sensor configured to detect a variable of the cooling system. The heat exchanger system includes processor circuitry configured to provide the variable and a plurality of potential operating parameters of the cooling system to a machine learning model representative of the cooling system to estimate at least one of energy consumption, water usage, and chemical usage for the potential operating parameters. The processor circuitry is further configured to determine, based at least in part on the estimated at least one of energy consumption, water usage, and chemical consumption, for the potential operating parameters, an optimal operating parameter of the cooling system to satisfy a target optimization criterion.

Abstract: The present disclosure relates to the field of air conditioning technology. In particular, it involves a control method and control system based on a variable speed AC compressor.

Abstract: A plurality of thermal areas (11a, 11b, 11c, and 11d) of different thermal environments are formed in a room (11). When it is determined that a person (13) riding on a movable object (20) is feeling uncomfortable in the thermal area (11d), the movable object (20) is remotely operated to move toward the thermal area (11a) where the person (13) feels comfortable.

Abstract: An air conditioning device is provided. The air conditioning device includes an image sensor, and a processor configured to identify an object based on edge information included in an image acquired through the image sensor, and control an operation of the air conditioning device based on the type information of the identified object.

Abstract: A heat exchanger unit includes: a first heat exchanger including a first header, a second header, and a first flat pipe group that includes first flat multi-hole pipes connected to each of the first header and the second header; and a second heat exchanger: disposed in parallel with the first heat exchanger on an air downstream side, from the first heat exchanger, of air flow generated by a fan; and including a third header, a fourth header, and a second flat pipe group that includes second flat multi-hole pipes connected to each of the third header and the fourth header. The fourth header causes a refrigerant that flows in from the third header to flow out to the first header.

Abstract: A vehicle control method is disclosed. A vehicle control method according to an embodiment of the present disclosure can determine a drowsy state of a driver through AI processing of state information of the driver acquired from a sensor included in a vehicle. A processor can control a carbon dioxide concentration, a carbon monoxide concentration, a fine dust concentration and cooling efficiency inside the vehicle by causing the outside air to enter the vehicle or circulating the air inside the vehicle upon determining that the driver is in a drowsy state. The processor outputs a second warning and controls driving of the vehicle according to the second warning upon determining that the driver is continuously in the drowsy state. Accordingly, occurrence of accidents due to drowsiness of the driver can be reduced.

Abstract: A compressed air drying system is provided for removing moisture from compressed air. The dryer operates in two modes in response to the demand for compressed air. In a first mode of operation, a refrigeration compressor runs continuously and the speed of a condenser fan is varied to maintain a constant cooling temperature. In a second mode of operation, the refrigeration compressor runs intermittently between on and off periods. As result, the cooling temperature fluctuates during the second mode of operation.

Abstract: A liquid supply device adapted to a liquid cooling system includes a casing, a cover, a plunger, a driving unit and a sensing unit. The casing has a liquid outlet. The cover is connected to the casing. A chamber is formed between the casing and the cover and contains a cooling liquid. The chamber communicates with the liquid outlet. The plunger is movably disposed in the chamber. The driving unit is disposed in the chamber and used for driving the plunger to move. The sensing unit is selectively disposed on one of the casing and the plunger. The sensing unit senses a liquid level of the cooling liquid and outputs a sensing signal with a predetermined status as the liquid level is equal to or lower than a predetermined height.

Abstract: Computer program products, devices, systems, and operations for early detection of poor performance and failure of a climate control system. The invention provides operations for computing an actual run time percentage (ART) from operational data of the climate control system, and operations for computing an estimated run time percentage (ERT) of the climate control system from temperature data of an uncontrolled climate. The invention also provides operations for issuing one or more alerts if the ART deviates from the ERT or a range thereof.

Abstract: A system for heat exchange and leak detection is generally provided, the system including a heat exchanger including a first wall defining a first passage containing a first fluid. A leak detection enclosure containing a leak detection medium is defined between the first wall and a second wall surrounding the first wall.

Abstract: Cooling control systems described herein detect decreased operation of a cooling system of a vehicle, restrict movement of the vehicle without stopping movement responsive to decreased operation of the cooling system, and restrict movement of the vehicle by preventing the vehicle from traveling at a speed and/or power output for a non-zero designated period of time. This can allow for the vehicle to continue moving for a temporary period of time to avoid blocking traffic. Other control systems determine predicted distances and/or times that the vehicle can continue moving before coolant in the cooling system decreases below a designated threshold. Movement of the vehicle can be changed responsive to an upcoming distance and/or time that the vehicle is to travel exceeding the predicted distance and/or time. Other control systems modify a coolant flow rate based on differences between designated and ambient conditions.

Abstract: A cooling water flow control device of a cooling system for a vehicle can shorten a warm-up time of a cooling water being supplied to an exhaust gas recirculation (EGR) cooler. The cooling water flow control device includes: the EGR cooler that cools an exhaust gas supplied to an intake system of an engine using cooling water and includes an EGR cooler outlet through which the cooling water is discharged; a water pump to circulate the cooling water to the EGR cooler and the engine at an engine startup; and a direct flow path connected to a vent hole formed in the engine to guide the cooling water from the vent hole to a downstream side of an EGR cooler outlet.

Abstract: A multi-floor data center can include a data center building having a plurality of floors, a single centralized air intake module spanning each of the plurality of floors, a number of cooling coil modules, a centralized liquid cooling system, and a number of IT modules. Each of the floors includes at least one of the cooling coil modules configured to receive external air from the single air intake module to cool a cooling coil. The centralized liquid cooling system is configured to circulate cooling liquid to the cooling coil for each of the cooling coil modules. Each of the floors includes one of the IT modules configured to house computing systems, and internal air is cooled at each of the cooling coil modules and introduced into each of the IT modules to cool the computing systems. Each floor can be equipped with different modular cooling systems with different cooling capacities.

Abstract: A method for operating an air inlet in a vehicle includes setting, via a touch-sensitive operator control unit in an air stream of the air inlet, a temperature and/or a volume flow of air flowing into an interior of the vehicle through the air inlet. The method also includes controlling a color of one or more luminous elements of the operator control unit depending on the setting of the temperature and/or of the volume flow. An apparatus for an inflow of air includes an air inlet, the air inlet configured to provide an inflow of an air stream into a vehicle interior, and a touch-sensitive operator control unit positioned in front of the air inlet such that the touch-sensitive control unit is disposed in the air stream, the touch-sensitive control unit being configured to set first and second operating parameters of the air inlet.

Abstract: A method of operating a heating, ventilation and air conditioning (HVAC) system includes determining a first heating or cooling demand for a first zone of a space and determining a second heating or cooling demand for a second zone of the space. The method determines that the first demand requires operation of the HVAC system in a first mode, and that the second demand requires operation of the HVAC system in a second mode opposite the first mode, and a simultaneous heat/cool algorithm is operated to alternatingly operate the HVAC system in the first mode to condition the first zone and the second mode to condition the second zone.

Abstract: A vehicle thermal management system includes an Integrated Thermal Management Valve (ITM) for receiving engine coolant through a coolant inlet connected to an engine coolant outlet of an engine, and for distributing the engine coolant flowing out toward a radiator through a coolant outlet flow path connected to a heat exchange system. The heat exchange system includes at least one among a heater core, an Exhaust Gas Recirculation (EGR) cooler, an oil warmer, an Auto Transmission Fluid (ATF) warmer, and the radiator. The thermal management system includes a water pump positioned at the front end of the engine coolant inlet of the engine and a coolant branch flow path branched at the front end of an engine coolant inlet to be connected to the coolant outlet flow path.

Abstract: An air conditioning system for an occupiable structure having a plurality of regions includes a plurality of air condition sensors, an air conditioning unit, and a programmable controller. The air condition sensor assemblies are each located in a respective region of the plurality of regions. The air conditioning unit is adapted to condition air in the occupiable structure. The controller is configured to receive a plurality of condition signals from each one of the plurality of air condition sensor assemblies and output an activate command that facilitates activating the air conditioning unit. The activate command is based on any one of the condition signals and a preprogrammed condition threshold. Each one of the condition signals is associated with a respective programmed time interval of a plurality of programmed time intervals.

Abstract: A system for determining the relative space heating energy contribution of different tenant spaces in a multiple tenant building that is heated via a central steam piping distribution system. A steam piping distribution system is connected to a central heat source such as a steam boiler plant or a local utility district steam service. The steam distribution system includes terminal units located throughout the building which deliver heat to different spaces. Data collected at regular intervals from sensors located throughout the building are analyzed by a computer in order to calculate the fraction of the overall building's steam use that is delivered to particular tenant spaces over a given interval in time.

Abstract: A heat exchanger is disclosed, having a vessel for containing a refrigerant, the vessel having a chamber bounded by a surface of a vessel wall, the vessel including an inlet and an outlet for transport of a refrigerant into and out of the chamber. At least one tube portion is inside the chamber, to enable fluid communication into and/or out of the tube portion through a first orifice and a second orifice. This at least one tube portion has an average diameter. The chamber has a space for the refrigerant, with the space having a volume, and the at least one tube portion has an outer surface in contact with the space for the refrigerant, this surface having an area. The volume divided by a product of the area and the average diameter is smaller than or equal to a constant.

Abstract: An air-conditioning apparatus includes a heat pipe, which performs heat exchange. The air-conditioning apparatus provides supply air in a set state (temperature, humidity) through a change in the flow passage of ventilation air and outside air by the selective opening/shutting of dampers, cooling the outside air by spraying mist, and cooling and humidifying the supply air. The cooling temperature and humidity of the supply air is controlled at a ratio of the ventilation air passing through a cooling coil and the ventilation air passing through a bypass passage. Using a bypass passage, ventilation air can directly move to an air supply block without the intervention of the cooling coil within a heat exchange block through which a ventilation air passes.

Abstract: Methods, devices, and systems for managing energy in a multi-dwelling unit are described herein. One method includes determining an energy consumption of each of a plurality of heating, ventilation, and air conditioning (HVAC) units, wherein each of the plurality of HVAC units is associated with a different space of a multi-dwelling unit having a plurality of spaces, normalizing the energy consumption of each of the plurality of HVAC units, and ranking the normalized energy consumptions.

Abstract: There is provided an information processing apparatus among a plurality of information processing apparatuses included within an information processing system, the information processing apparatus including a memory, a processor coupled to the memory and configured to perform information processing, and a controller configured to acquire a plurality of sensor data items output from each a plurality of sensors arranged in a liquid cooling system cooling the plurality of information processing apparatuses and abnormality information relating to the liquid cooling system stored by another information processing apparatus among the plurality of information processing apparatuses, detect an abnormality of the liquid cooling system based on the acquired sensor data items and the abnormality information, obtain a range of influence of the detected abnormality of the liquid cooling system based on the detected abnormality, and control the information processing apparatus based on the range of influence.

Abstract: An air conditioning system includes: an air conditioner to regulate a state of air in a room; a sensor device including at least one detector to detect an amount of an odor-causing substance included in the air in the room; and a control device to control operation of the air conditioner. The control device includes: a first acquisition unit to acquire a detected value of each of the at least one detector at a first timing when a person is present in the room; a second acquisition unit to acquire a detected value of each of the at least one detector at a second timing later than the first timing; a difference calculator to calculate a difference between the detected value at the first timing and the detected value at the second timing; and an instruction unit to control operation of the air conditioner based on the difference.

Abstract: The present invention involves using either liquid nitrogen, dry ice, a gel-like solution of water and alcohol in an ice pack, or a combination of these in a method or device for rapidly lowering the temperature of multiple food and beverage products at the same time. The gel-like ice pack may be shaped around the food or beverage product to increase the surface area resulting in faster cooling. The device may also contain a scale, infrared temperature sensor, and bar code scanner for determining the initial weight, temperature, density, and type of food or beverage product to be cooled.

Abstract: A system for detecting a connector failure associated with an agricultural apparatus is disclosed. The system comprises a first supply source that is configured to supply a quantity of air at a first pressure into the hydraulic fluid line arranged on the agricultural apparatus. A second supply source is configured to supply a quantity hydraulic fluid to the hydraulic fluid line at a second pressure that is less than the first pressure. A protection device is coupled to the hydraulic fluid line and is configured to inhibit flow of the hydraulic fluid supplied by the second supply source when a pressure differential across an inlet of the protection device exceeds a predetermined threshold.

Abstract: A battery-powered power unit is provided in which a state of charge parameter is used to determine whether to shut off the battery-powered power unit, and an adjustment parameter is used to determine when to shut off the battery-powered power unit closer to a predetermined state of charge value for the battery. The state of charge parameter may be voltage across the battery, and the adjustment parameter may be current leaving the battery-powered power unit. The parameters may be values that are internal to the battery-powered power unit. The battery-powered power unit can be used in, for example, tractor auxiliary power units.

Abstract: A device for maintaining the internal temperature of a pressure vessel. The device includes a pressure vessel equipped with a main heater for heating test water to a predetermined test temperature and for maintaining the predetermined test temperature, a preheater for primarily heating the test water to the predetermined test temperature before the main heater heats the test water, and a heat exchanger including an feed pipe for feeding the test water heated by the preheater to the pressure vessel and a discharge pipe for transporting the test water discharged from the pressure vessel, in which the feed pipe is disposed inside the discharge pipe.

Abstract: Techniques for operating a data center include providing at least one fan coil unit operable to circulate a cooling airflow to a human-occupiable workspace of the data center; providing a plurality of computer racks arranged in one or more rows in the human-occupiable workspace; forming one or more warm air aisles between the one or more rows of the plurality of computer racks that are in fluid communication with an inlet of the fan coil unit through a warm air plenum, and also with an outlet of the fan coil unit through the human-occupiable workspace and the plurality of computer racks arranged in one or more rows; adjusting the associated electrical power density of one or more of the plurality of computer racks; and based on the adjustment, adjusting a characteristic of the data center.

Abstract: The present disclosure provides an air conditioner system that includes a plurality of air-conditioners, and a management server configured to receive air-conditioner data from the plurality of air-conditioners, and to analyze the received air-conditioner data to diagnose a state of the air-conditioners. The management server is configured to perform a first or short term diagnosis of the state of the air-conditioners. The management server to perform a second or long term diagnosis of the state of the air conditioners during a certain period, based on a result of the first diagnosis.

Abstract: The present disclosure relates to the field of air conditioning technology. In particular, it involves a control method and control device based on a DC variable speed AC compressor.

Abstract: An air cleaner is provided that may include at least one blowing device including a main fan that generates air flow and a first discharge outlet through which air passing through the main fan is discharged; a flow controller movably provided at one side of the at least one blowing device, the flow controller including a sub-fan that generates air flow and a discharge grill through which air passing through the sub-fan is discharged; and a display provided in the discharge grill, the display device displaying operation information.

Abstract: A vehicle front structure includes a grille opening disposed in a front end of a front compartment of a vehicle, a radiator disposed rearward of the grille opening in the front compartment; and an air guide having a folded wall shape and extending along a length of the vehicle between an outward side of the grille opening in a vehicle width direction and an outward end of the radiator in the vehicle width direction. The air guide includes a protruding part extending from the outward side of the grille opening in the vehicle width direction toward a center in the vehicle width direction and including a tip end portion extending to an outward end of the radiator core in the width direction of the vehicle when viewed in a front view of the vehicle.

Abstract: Various aspects and embodiments of automation in tenancy transitions are described. Among other aspects or features of the embodiments, a computing device in an automation or gateway hub receives and stores automation settings from an automation management service environment over time. The automation settings can include different settings for various states of occupancy of a rental unit or dwelling. For example, the automation settings can include a first set of tenant-defined automation settings, which can be defined by a tenant while the dwelling is occupied by the tenant, and a second set of property-manger-defined vacancy automation settings for use after the tenant vacates the dwelling. The automation or gateway hub can determine whether a transition in tenancy has occurred for the dwelling (e.g., when the tenant moves out) and, in response to the transition, load the vacancy automation settings into one or more home automation devices of the dwelling.

Abstract: Systems and methods are provided and include a variable-capacity compressor operable in a first capacity mode and in a second capacity mode that is higher than the first capacity mode. A control module is configured to switch the variable-capacity compressor between the first capacity mode and the second capacity mode based on a demand signal from a thermostat and an indoor relative humidity sensed by an indoor relative humidity sensor. The control module determines whether the indoor relative humidity is greater than a predetermined humidity and operates the variable-capacity compressor in the second capacity mode in response to receiving the demand signal from the thermostat and the indoor relative humidity exceeding the predetermined humidity.

Abstract: The need to clean dirty condenser coils in an operating refrigeration appliance is performed by connecting a temperature monitor to the coil to signal when a predetermined rise in temperature has occurred from a baseline temperature that exists when the coil structure is clean. The temperature monitor can merely provide the actual temperature reading or it can be programmed for the selected temperature rise to light up or display an appropriate message that coil cleaning needs to be done.

Abstract: An HVAC controller receives signals from a plurality of sensors positioned in different spaces. The HVAC controller includes a housing and a user interface that is accessible from an exterior of the housing. A controller is configured to control the HVAC system using a control temperature that comprises a weighted combination of two or more of the current temperatures reported by the plurality of sensors. The controller tracks which of the different spaces are currently occupied and how long each of the currently occupied spaces have been occupied, and as a currently occupied space remains occupied for a longer period of time, the controller provides increasing weight over time to the current temperature reported by the sensor of the plurality of sensors that is in that currently occupied space, and controls the HVAC system in order to drive the control temperature towards a temperature set point.

Abstract: The disclosure relates to methods, systems, and apparatuses, including computer programs on a computer storage medium, for generating a dynamic user interface and playing a video within the dynamic user interface. A dynamic computer user guidance system includes a user interface generation module that causes a display of a dynamic user interface. The dynamic user interface provides a plurality of instructions via one or more dynamic elements. The user interface generation module generates a user interface status indicator. The system includes a video control module that an integrated video to play in the dynamic user interface in response to receipt of the user interface status indicator. The video control module generates a video status indicator. A synchronization module communicably coupled to the user interface generation module and the video control module synchronize a state change in one or more dynamic elements in response to receipt of the video status indicator.

Abstract: A heating, ventilation, and air conditioning (“HVAC”) system and a method for controlling the HVAC system. The HVAC system includes a compressor and a variable speed discharge fan. The method includes determining, with a controller, a low fan capacity setting based on an operation of the compressor. The method also includes maintaining a discharge fan capacity at the low fan capacity setting, and varying a coil discharge air temperature between a low discharge air temperature limit and a high discharge air temperature limit. The method further includes when the coil discharge air temperature reaches the low discharge air temperature limit, varying the discharge fan capacity between the low fan capacity setting and a high fan capacity setting so as to maintain a space temperature at a space temperature setpoint, while maintaining the coil discharge air temperature at the low discharge air temperature limit.

Abstract: An air-conditioning system of a vehicle for air-conditioning a vehicle interior compartment may include a channel system which is flowed through by air and a sensor device for detecting at least one property of air. The sensor device may include at least one analysis channel through which air is flowable during operation, and a generating device configured to generate and emit electromagnetic waves. The sensor device may also include a diverting device configured to divert the electromagnetic waves emitted by the generating device at least partially into an interaction section of the at least one analysis channel, through which interaction section the diverted electromagnetic waves may pass and interact with air flowing through the at least one analysis channel. The sensor device may also include a detector which detects the diverted electromagnetic waves after the interaction with the air.

Abstract: A method is provided for cleaning an optical entry window (1) of a fire detector (2), wherein an intermittent gas stream is discharged from at least one gas exit opening (7) onto the surface of the optical entry window (1) of the fire detector (2), wherein the intermittent gas stream having a number of pressure pulses (14) is discharged onto the optical entry window (1), and to an apparatus for cleaning an optical entry window. The method has the advantage that the optical entry window of a fire detector can be cleaned from contamination intermittently and corresponding to the intensity of contamination with a matched and low consumption of gas.