3504 results about "Air velocity" patented technology

A method and system are provided for auditing, monitoring and controlling the energy consumption within a utility. Energy consumption data is obtained from a series of modules monitoring and controlling a variety of physical conditions, such as ambient light, temperature, pressure, air velocity, cooling, and heating, and devices. These modules transmit energy consumption and physical conditions data over a wireless personal area network (WPAN) through a transceiver. A central control station obtains the energy consumption data and stores it in an energy usage database. Energy management logic calculates and provides to the user an energy management solution, to reduce energy consumption and costs, by applying rule-based artificial intelligence to the stored energy consumption data in conjunction with information from the Internet. In one embodiment, the energy management solution can automatically control devices to effectively conserve energy.

Low-frequency bandwidth extension in the form of dynamic electrical equalization may be applied to loudspeakers so long as the excursion capability of their drive units as well as velocity limits of any port(s) or excursion limits of any associated passive radiator(s), and the power limits of the drive units are not exceeded. The bandwidth extension maximizes low-frequency bandwidth dynamically such that excursion is fully utilized over a range of drive levels, without exceeding the excursion limit. Additional limiting control is available for port air velocity or passive radiator excursion, and loudspeaker drive unit electrical power. The system applies to open back, closed box, vented box, and more complex box constructions consisting of combinations of these elements for loudspeaker designs using design parameters appropriate to each system.

A system and method for dispersing fluids from an agricultural vehicle includes a sprayer that dispenses the fluids and a controller cooperative with a plurality of sensors to sense vehicle travel speed, vehicle travel direction, wind speed, wind direction, and the heights of first and second nozzles from the ground surface. The controller includes a memory storing a look-up table having fan angles of the first and second nozzles, and a processor that computes first and second spray pattern on the ground surface based on the fluid dispensed through the respective first and second nozzles. The processor determines an overlap region between the first and second spray patterns, compares the determined overlap region with a pre-determined overlap, and takes corrective action automatically by changing travel speed of the vehicle or changing a duration of time the fluids are dispensed from the first and second nozzles.

An ejector, such as a venturi, facilitates the delivery of gaseous fuel to the combustion chamber of a burner. A blower forces air through the ejector, and the air flow produces a suction that draws fuel from a fuel inlet to produce a fuel-air mixture. The amount of fuel drawn from the fuel inlet is a function of the air flow such that a substantially constant fuel-air ratio is obtained over a range of air flow rates and temperatures without the need for a separate high-pressure fuel pump. The fuel-air mixture may be provided to a combustion chamber for combustion. Air from the blower may be pre-heated prior to entering the ejector, for example, using a heat exchanger that recovers some of the heat from the combusted fuel-air mixture. Air flow through the ejector may be conditioned, for example, by a swirler, to produce a tangential air flow that can increase fuel flow by increasing air velocity across the fuel inlet and/or produce a swirl-stabilized flame in the combustion chamber. The combusted fuel-air mixture may be provided to a thermal load, such as an external combustion engine. Blower speed may be controlled manually or automatically to control power output. Fuel flow to the ejector can be controlled manually or automatically to control fuel-air ratio. The burner can be configured to operate with multiple fuel types, for example, using a fuel selector with fixed or variable restrictors.

A compact mobile vacuum boring, and excavation method comprising a device which will create a vacuum condition within a vacuum container and having a vacuum conduit to air convey a liquid and or solid particles into the vacuum container. The vacuum container air inlet & outlet conduit arrangement may also facilitate the separation of solids from the vacuumed air flow by producing a cyclone effect within the vacuum container. A circular cyclone effect is created within the vacuum container by the arrangement relationship between the inlet and outlet vacuum air conduits and baffles. As the air velocity slows, the solids precipitate out of the air and settle in the vacuum container. A housing with filters disposed within it is also adjacently mounted near the vacuum container in order to reduce the quantity of connecting conduits and facilitate a compact, efficient and clean interaction between the vacuum container and the filter housing. The vacuum container access door and the filter housing access door may be adjacently placed in near proximity to each other for user friendly access to empty and clean the vacuum container and filter house or a common door may access both. A compressible seal and conduit arrangement may be used as a quick disconnect between the vacuum producing means and the filter housing. A reversing valve arrangement may be used to back flow air through the filter. Sensors, data gathering, data logging and documentation of a service event may be included. The above systems may be mounted on a variety of mobile platforms.

The invention discloses a multi-factor comprehensive simulation accelerated testing device for a climatic environment. The multi-factor comprehensive simulation accelerated testing device comprises a testing box in which a sample frame is arranged, a light source system, an intelligent spraying system, a temperature and humidity regulating system, a circulation air system and a control system. With the adoption of the device, an environmental effect with five environmental factors, such as illumination, corrosive medium, temperature, humidity and air speed can be simultaneously simulated or strengthened; actions, such as radiation power variation, atomizing (or spraying), heating (or cooling), air speed and the like of the light source can be controlled by using an PLC (programmable logic controller) or a singe-chip so as to simulate and strengthen a plurality of typical climate environments; drying and watering circulation on the surface of a sample in the test box can be controlled well through adopting intelligent atomizing (or spraying) control; and accelerated ratio and relevance are improved. The testing device can be used for developing two kinds of different light aging test and damp heat test so as to achieve the effect that one box has multi purposes.

A method and system for variable speed fan control for thermal management of a device includes disposing a first temperature sensor proximate a variable speed fan to measure an air temperature of inlet air T_air that cools the device by convection air flow. A controller is configured to compensate for changes in T_air by varying a convection coefficient (h) which is a strong function of air velocity to maintain the product of h*ΔT at a constant value, wherein ΔT is a temperature differential between the device (T_AD) minus T_air. Thus, h is varied by varying air velocity by varying a speed of the variable speed fan.

This invention relates to a personal air purifier having a housing with a filtering-and-purifying unit, a fan and an air-velocity-controlling unit therein. Under the control of the air-velocity-controlling unit, the fan can draw air through an air inlet into the housing and supply it via the filtering-and-purifying unit and a vent hole to the user, with comfortable air pressure and the filtering-and-purifying unit can purify most of the harmful substances from the air, making the air well purified. The vent hole is formed in the housing and connected with a duct that is extending to the user's nostril to supply the well purified air to the user. The personal air purifier is able to be carried on the shoulder or belt of the user anywhere, and is able to be activated by the solar energy when it is used outdoors.

A method for cleaning a stationary gas turbine unit during operation, wherein the unit comprises a turbine, a compressor driven by the turbine, the compressor having an inlet, an air inlet duct arranged upstream of the air inlet of the compressor, the inlet duct having a part of the duct adjoining the inlet of the compressor and having decreasing cross section in the flow direction in order to give the air flow a final velocity at the inlet to the compressor. A spray of cleaning fluid is introduced in the inlet duct. The cleaning fluid is forced through a spray nozzle with a pressure drop exceeding 120 bar to form a spray the drops of which have a mean size that is less than 150 μm. The spray is directed substantially parallel to and in the same direction as the direction of the air flow. The spray is introduced at a position in the duct section where the air velocity is at least 40 percent of the final velocity at the compressor inlet, so that the drops of the liquid spray are caused to acquire a slip ratio of at least 0.8 at the compressor inlet.

The invention relates to a low-ratio biomass circulating fluidized bed boiler and a combustion method thereof, relating to a circulating fluidized bed boiler and a combustion method thereof and solving the problems of difficult feeding, grate slagging, bed material coking, tempering and output reduction, and the like existing in the operation of traditional grate furnaces and circulating fluidized bed boilers. A middle air chamber corresponds to the middle of a dense-phase area at the lower part, lateral grid plates are arranged between a lateral air chamber and the dense-phase area at the lower part, and a medium-temperature steam-cooled cyclone separator is arranged at the joint between a flue shaft at the tail part and a health outlet of a boiler body, respectively communicated with the flue shaft and the health outlet and communicated with the dense-phase area at the lower part through a material returner. The method adopts a negative-pressure feeding manner so that the fluidization air velocity of a high-speed area of the dense-phase area at the lower part is 4-5 m/s, the fluidization air velocity of a low-speed area is 1.5-2.0 m/s, the temperature of the dense-phase area at the lower part is 650-780 DEG C, and the material circulation ratio is below 10. The invention is suitable for the biomass circulating fluidized bed boiler for an electric power plant.

The invention discloses an air capacity control method of an air purifying device. The air capacity control method includes the following steps: 1, the air purifying device is arranged, and a pressure sensor is arranged at the leeward position of a filter; 2, an air speed value is preset; 3, the pressure sensor detects pressure values, an anemoscope detects average air speed values, and a control system calculates scale values between the pressure values and squares of the average air speed values according to a preset program; 4, the pressure sensor feeds the pressure values back to the control system at set intervals, and the control system calculates current average air speed values according to the preset program, the received pressure values and the scale values in the previous step; 5, if the current average air speed values are smaller than the preset air speed value, the output power of a draught fan is automatically and gradually adjusted till the current average air speed values reach the preset air speed value, and therefore the air capacity is controlled to be stably output. The invention further discloses the air purifying device. The air capacity control method and the air purifying device have the functions of high-accuracy air capacity control and accurate filter-replacement reminding.

The invention relates to an intelligently controlled air purifier and a control method thereof. The intelligently controlled air purifier comprises a shell, a motor, an electrostatic adsorption device, a high-pressure generator, a wind wheel, a wind speed adjuster, a filter screen, a filter, an anion generator, a UV (ultraviolet) light source, a particulate matter sensor, a harmful gas sensor and a control system. The control system comprises a microprocessor control unit, a touch keyboard, an infrared remote controller, an LCD (liquid crystal display) and an information transmission system. The microprocessor control unit is used for controlling all parts including the high-pressure generator, the wind speed controller, the anion generator, the UV light source, the particulate matter sensor and the harmful gas sensor according to real-time or preset timing command information provided by touch keys or real-time command information provided by the keys of the infrared remote controller. The intelligently controlled air purifier and the control method thereof has the advantages that not only can real-time control and 24-hour four-period preset timing control be realized, but also PM2.5 real-time detection data can be digitally displayed.

The invention relates to an environmental monitoring system based on a wireless home-appliance network; the environmental monitoring system is characterized by comprising an outdoor photosensitive sensor, a rainwater sensor, an air velocity sensor, an outdoor temperature sensor, an outdoor air quality monitor, an indoor photosensitive sensor, an indoor temperature sensor, a human body sensor, an indoor air quality monitor and sensor control equipment; the outdoor environmental conditions are monitored by the outdoor photosensitive sensor, the rainwater sensor, the air velocity sensor, the outdoor temperature sensor and outdoor air quality monitor and the like; the indoor environmental conditions are monitored by the indoor photosensitive sensor, the indoor temperature sensor, the human body sensor and the indoor air quality monitor; according to the contrast result, the environmental monitoring system prompts users to open doors and windows when the outdoor environment is of good quality, so that the usage of home-appliances is reduced and the energy source is saved; the environmental monitoring system prompts users to close doors and windows and switch on the home-appliances when the outdoor environmental quality degrades. The environmental monitoring system based on the wireless home-appliance network is capable of improving the living environments and giving an alarm when the indoor harmful gases are out of limits.

The invention discloses an active power control method for wind power plant participated power grid frequency modulation. Wind turbine units are divided into a critical unit, a low air speed unit and a high air speed unit according to the operating conditions of the wind turbine units; the active dispatching power is modified according to the real-time frequency deviation and the active power adjustable value of the wind power plant to obtain active power modification values of the wind power plant participated power grid frequency modulation; and then the active power modification values are allocated to each wind turbine unit of each type according to the types of the wind turbine units to enable the wind turbine units of each type to participate in the frequency modulation based on a certain sequence. According to the active power control method, the wind power plant is taken as the object and the wind power plant participates in the power grid frequency modulation within a certain frequency deviation; the active power control method considers the reasonable distribution of the frequency modulation amount among the units according to the different operating conditions of the units and the active adjustable amount of the wind turbine units; and therefore, the wind power plant can make response rapidly, and the power grid frequency deviation can be reduced to the greatest extent.

The invention discloses an artificial light cultivating method of dendrobium candidum, belonging to the technical field of medical plant cultivation. The method comprises the following steps: naturalized young plants are transplanted to a nutrition pot or a potted tray containing base material and placed in a three-dimensional cultivating shelf of an artificial light closed plant factory; wherein cultivating conditions are as follows: the illumination intensity is 60-150 mu mol.m-2.s-1; the illumination time is 9-12h.d-1, the temperature is 24-27 DEG C; the relative humidity is 65-80%; the CO2 concentration is 400-800 mu mol.m-1; and the air velocity is 0.3-0.6 m.s-1; after the young plants are transplanted, atomizing keeps the humidifying state of leaf surfaces of the young plants before 2 weeks; after two weeks, the young plants are watered; according to the principle of keeping the humidification of the base material, macroelement nutrient solution is applied every 7 to 15 days; microelement nutrient solution is applied every 25 to 35 days; bottom surface is watered every 3 to 5 days; the young plants are harvested after being cultivated for 1.5 to 2 years and every half year is a picking time. The method shortens the production period, guarantees the uniform quality of the products, increases the yield, and is easy to realize standardization, industrialization and scale production.

The invention discloses a novel energy-saving environment-friendly numerical-control fume hood of a laboratory. The novel energy-saving environment-friendly numerical-control fume hood comprises a cabinet, a sliding window, a deflector and a numerical control system. The deflector is provided with a plurality of guide holes; air outside the fume hood flows into an inner cavity of the cabinet after the sliding window is opened; and under guiding of the deflector, gas generated in a testing area is exhausted from the guide holes of the deflector. The numerical control system comprises an automatic sliding window controller, a non-contact sliding window controller, a face velocity controller and a system controller. The automatic sliding window controller is used for detecting whether operators work in an operation area in front of the fume hood or not so as to automatically increase or decrease openness of the sliding window. The non-contact sliding window controller is used for the operators to open the sliding window to a required position in a non-contact way. The face velocity controller is used for regulating exhaust rate of the fume hood automatically according to the openness of the sliding window, and sending the exhaust rate and running states of the fume hood to the system controller so as to regulate running frequencies of an exhaust fan and an air supplement fan.

The invention discloses a fan frequency conversion control system and method for air pressure dynamic balance of a mine stope. The fan frequency conversion control system comprises an alternating-current frequency converter console, a counter rotating axial flow fan, carbon monoxide sensors, air speed sensors, a differential pressure sensor, an intrinsically safe power supply, and an intrinsically safe junction box, wherein the alternating-current frequency converter console has two sets of alternating-current frequency converters; the frequency converters, the counter rotating axial flow fanand the intrinsically safe power supply are arranged in an inlet alley; the air speed sensor 1 is arranged in the air inlet alley; the differential pressure sensor and the air speed sensor 2 are arranged in an air return alley; and the two carbon monoxide sensors are arranged in an air return corner region. Data such as carbon monoxide content, air quantity, air pressure and the like is real-timemonitored, ventilation quantity of a mining working surface is automatically controlled, so that the mining working surface and the environment air pressure automatically achieve dynamic balance, thus the safety production of the mining working surface is achieved when a plurality layers of mine goafs are communicated with each other, the working efficiency, the precision degree and the safety degree are improved; the fan is driven by frequency conversion, so that the fan has energy-saving effect, broad adaptability, social benefits and economic benefits.