433 results about "Ventilation mode" patented technology

Systems and methods for configuring the operation of an alternating pressure ventilation mode are provided. According to one embodiment a configuration method includes monitoring gas flow between a patient and a ventilation system. Based on the monitoring, a peak expiratory flow rate (PEFR) is determined Information indicative of values of parameters of the ventilation mode are received, including a higher pressure setting, a lower pressure setting and a duration of the higher pressure setting. User input is also received indicative of a target percentage of PEFR at which the ventilation system should cycle from the lower pressure setting to the higher pressure setting. Based on the target percentage, a duration of the lower pressure setting is programmatically determined. Finally, the ventilation system is configured to automatically cycle between the higher and lower pressure setting at a predetermined flow based on the parameters and the duration of the lower pressure setting.

In order to select an optimal ventilation mode for mechanically ventilating a patient, from among a number of ventilation modes, a mathematical description of the patient's respiratory system is produced in a computer from measured parameters related to properties of the respiratory system, and in the computer the mathematical descriptions for different modes of ventilation are tested on the mathematical description to obtain simulated results. An operator can selected a mode of ventilation to be analyzed by comparing the simulated results with a therapeutic goal, so that an optimal ventilation mode can be selected. Alternatively, the computer can iteratively test a number of modeled ventilation modes to identify the ventilation mode which comes closest to the therapeutic goal.

An energy-reducing method and apparatus for retrofitting a constant volume HVAC system, with or without an economizer, that provides heating, cooling, and ventilation to occupants within a building space. The present invention includes the introduction of a programmable logic controller and variable frequency drive (VFD) that takes control of the existing fan, heating, cooling, and optional economizer operation. The controller is programmed for the reduction of fan speed in the heating and cooling modes. The reduction of the fan speed in the ventilation mode when the 100% operation is not needed saves significant energy of the existing constant volume HVAC system where the fan motor is designed to run 100% of the time. The fan speed may be further reduced upon a reduction in sensed occupancy levels of the space, such as with a CO2 sensor. Additionally, the fan speed may be reduced in the heating and / or cooling mode to further reduce energy consumption. The controller may also be programmed and equipped with sensors to allow simultaneous mechanical compressor cooling and economizer free cooling operation, for the operation of the economizer in response to the monitoring of outside air and return air to determine the preferred source for cooling operations, to keep the outside air damper closed during the unoccupied heating modes such as morning warm-up, and / or to provide fault detection. The retrofit method and apparatus may be employed in a stand-alone or networked version.

The invention relates to a control method of a variable frequency air conditioner. The variable frequency air conditioner comprises a compressor, a four-way change valve, an outdoor heat exchanger, an outdoor fan, a throttling element, an indoor heat exchanger and an indoor fan, wherein an exhaust outlet of the compressor is provided with a compressor exhaust temperature sensor; an outdoor environment temperature sensor and an outdoor heat exchanger temperature sensor are arranged on the outdoor heat exchanger; and an indoor environment temperature sensor and an indoor heat exchanger temperature sensor are arranged on the indoor heat exchanger. When more than one temperature sensor breaks down, the variable frequency air conditioner can be operated according to the following control method of defaulting the detection temperature of the indoor environment temperature sensor to be 26 DEG C under a refrigeration, dehumidification or ventilation mode when the indoor environment temperature sensor breaks down. The invention can ensure that the air conditioner can be still normally used when partial sensors break down so as to ensure that a consumer furthest uses the variable frequency air conditioner with faults and reduce troubles caused by the faults of the air conditioner to the consumer.

A cooling system that has a heat exchanger which is housed in one enclosure and is constituted of a plurality of heat exchange modes, and the heat exchanger includes a refrigerant forced circulation mode, a refrigerant natural circulation mode, and a ventilation mode. A temperature detector performs switching to an optimal mode, to thereby cool the inside of the enclosure of a housing accommodating equipment including a heat-generating component.

An energy-reducing method and apparatus for retrofitting a constant volume HVAC system, with or without an economizer, that provides heating, cooling, and ventilation to occupants within a building space. The present invention includes the introduction of a programmable logic controller and variable frequency drive (VFD) that takes control of the existing fan, heating, cooling, and optional economizer operation. The controller is programmed for the reduction of fan speed in the heating and cooling modes. The reduction of the fan speed in the ventilation mode when the 100% operation is not needed saves significant energy of the existing constant volume HVAC system where the fan motor is designed to run 100% of the time. The fan speed may be further reduced upon a reduction in sensed occupancy levels of the space, such as with a CO2 sensor. Additionally, the fan speed may be reduced in the heating and / or cooling mode to further reduce energy consumption. The controller may also be programmed and equipped with sensors to allow simultaneous mechanical compressor cooling and economizer free cooling operation, for the operation of the economizer in response to the monitoring of outside air and return air to determine the preferred source for cooling operations, to keep the outside air damper closed during the unoccupied heating modes such as morning warm-up, and / or to provide fault detection. The retrofit method and apparatus may be employed in a stand-alone or networked version.

The invention discloses a washing method for an air conditioner. The washing method comprises the following steps of: (S1) moisture condensation, namely forming condensate water on the surface of a heat exchanger by refrigeration of the air conditioner so as to wash the surface of the heat exchanger; (S2) frost formation, namely forming a frost layer on the surface of the heat exchanger by refrigeration of the air conditioner; (S3) heating, namely heating by using the air conditioner to realize defrosting so as to wash the surface of the heat exchanger, and sterilizing; and (S4) ventilation, namely making an indoor unit run in a ventilation mode so as to quick dry and cool the heat exchanger. The air conditioner comprises a control device, andoperations of the rotating speed of a fan and the running frequency of a compressor in the steps are preset in the control device. On one hand, the washing method for the air conditioner disclosed by the invention realizes two-step washing, also realizes sterilization, can be used for effectively cleaning the heat exchanger and maintains the heat exchanger to be sanitary and free of pollution; and on the other hand, the rotating speed of the fan and the running frequency of the compressor are set in each stage of the washing method so that the system of the air conditioner is utilized as far as possible, and thus the cleaning effect of theair conditioner is improved.

A method and apparatus for ensuring against explosion of the gaseous atmosphere of a closed chamber, such as the QDCD room of an internal turret of an offshore production and offloading buoy wherein the closed chamber has production risers and conduit connectors that represent a potential source of flammable gas. The method comprises mixing and diluting the oxidant content of the air by introducing within the closed chamber a sufficient quantity of inert gas to render the mixture of the air and any flammable gas non-combustible regardless of the flammable gas content of the mixture. The method includes removal of the non-combustible mixture of air and any flammable gas from the closed chamber by purging thereof to the natural atmosphere, while introducing inert gas, thereby leaving a substantially inert atmosphere within the closed chamber. The turret system provides for control of the gaseous atmosphere within the closed chamber at all modes of turret operation, including the idle, on-line and ventilation modes and also provides for gas pressure control to accommodate normal operating conditions and conditions of gas leakage into the chamber.

A method performed by a zone controller for a zone of a building for improving energy efficiency in a heating, ventilation, and air conditioning (HVAC) system is provided. The method includes operating in a ventilation mode. A temperature of the zone and outside air conditions for the building are monitored. A determination is made regarding whether to switch from the ventilation mode to an economizing mode based on a first set point for the temperature of the zone and based on the outside air conditions. The first set point is determined based on a second set point for the temperature that is different from the first set point. A determination is made regarding whether to activate the HVAC system based on the second set point.

The invention relates to a deodorant nitrogen-conserving conditioner. The using method comprises the following steps: evenly mixing pig manure and crushed straw or other crop straw in a ratio of 2-8:1, wherein the moisture content is between 60 and 65 percent; carrying out simple high-temperature composting by adding 25 to 40kg deodorant nitrogen-conserving conditioner in each 1,000kg compost rawmaterial; and adopting a pile-turning or a forced ventilation mode, wherein the temperature is not more than 70 DEG C during high-temperature composting. The deodorant nitrogen-conserving conditionercomprises 15 to 20kg calcium chloride, 10 to 15kg calcium superphosphate and 3 to 8kg zeolite. The compost becomes thoroughly decomposed after 30-day composting. The deodorant nitrogen-conserving conditioner is characterized in that: the conditioner can reduce odorous substances in the pig manure compost and ammonia volatilization and eliminates odour more than 10 days earlier; moreover, the conditioner increases the content of nitrogen nutrients in a compost product by over 20 percent and reduces nitrogen loss by over 70 percent in the composting process; and at the same time, the conditioner has the advantage of simple and easy operation and is suitable to be used in organic fertilizer factories and vast rural areas.

The invention discloses a road tunnel intercommunication type longitudinal ventilation mode. The road tunnel intercommunication type longitudinal ventilation mode is characterized in that: an underground fan room and a connection ventilation duct are arranged at an appropriate position between two adjacent tunnels; the underground fan rooms are used for installing ventilation fans; the connection ventilation ducts are used for connecting the air flow of two tunnels; the automobile tail gas, which is generated in sections from the underground fan rooms to outlets, of pure uphill tunnels or uphill-major tunnels (uphill tunnels for short) is diluted by using cleaner air in pure downhill tunnels or downhill-major tunnels (downhill tunnels for short); and the polluted air, which is generated in sections from inlets to the underground fan rooms, of the uphill tunnels is discharged through the outlets of the downhill tunnels. By adoption of the road tunnel intercommunication type longitudinal ventilation mode, ventilation equipment can be reduced, ventilation shafts, inclined shafts or electrostatic dust removal stations are eliminated, and ventilation power consumption in daily operation is low, so that civil engineering cost and operation cost are reduced.

The invention relates to a 'micro ventilation lime wood antrodia camphorate cultivation method', and belongs to the field of fungus cultivation. The method is characterized by comprising: inoculating a liquid strain onto a camphorwood section with the moisture content of 50 to 70 percent; and performing micro ventilation culture to culture fruit bodies at a temperature of 25 to 28 DEG C and a humidity of 85 to 95 percent. In the method, camphorwood is treated, the liquid strain obtained by liquid fermentation and reproduction is inoculated onto the surface of camphorwood, culture is performed in a micro ventilation mode by controlling culture temperature, humidity, light and other conditions, the growth period is 11 months, the biological conversion rate is 15 percent, the polysaccharide content is equal to that of wild antrodia camphorate, the antrodia camphorate cultivated on the lime wood has the same appearance, fragrance, bitter taste, medicinal effectiveness and the like as wild antrodia camphorate.

The invention discloses a rotating wheel moisture removal and cooling-plate radiation cooling combined air conditioning system and an air conditioning method thereof. The device comprises a rotating wheel moisture removing part and a cooling-plate radiation cooling part. A moisture-removing rotating wheel is used for removing the moisture load of the fresh air supplied to rooms, and then dry fresh air is supplied to air-conditioner rooms in a replacement ventilation mode; the cold medium generated by a refrigerating unit serves as the cold medium for the radiation cooling of an indoor cooling plate, and the radiated cold energy is used for removing the moisture and heat load in the rooms. The fresh air is supplied to the air-conditioner rooms in the replacement ventilation mode to keep the freshness of indoor air; meanwhile, the indoor air flow rate is low, so the blown feeling of the human body is eliminated, the majority of the cold load is eliminated by radiation heat exchange, the indoor temperature distribution is uniform and thus the indoor comfort degree is improved obviously. In the system, the moisture removal and cooling of an indoor environment are combined, both the indoor temperature and humidity are controlled accurately, and the indoor air quality is improved; meanwhile, due to the independent control of the humidity, the efficiency of a refrigerating unit is improved and energy is saved.

A method performed by a zone controller for a zone of a building for improving energy efficiency in a heating, ventilation, and air conditioning (HVAC) system is provided. The method includes operating in a ventilation mode. A temperature of the zone and outside air conditions for the building are monitored. A determination is made regarding whether to switch from the ventilation mode to an economizing mode based on a first set point for the temperature of the zone and based on the outside air conditions. The first set point is determined based on a second set point for the temperature that is different from the first set point. A determination is made regarding whether to activate the HVAC system based on the second set point.

A clean room unit which is equipped with a work room and a clean bench unit can be independently installed inside a building, can generate an air shower in the work room, and can realize miniaturization and cost reduction. The clean room has a work room, a clean bench unit which has a work opening and has the work opening installed to look onto the work room, an air conditioning system which can perform purification and pressure control of air inside the work room and the clean bench unit and can generate an air shower in the work room, and a control unit. The air conditioning system is controlled by the control unit to switch exclusively between the air shower mode, the ventilation mode, the positively-pressurized work mode, and the negatively-pressurized work mode.

The invention discloses a motor capable of realizing a stator closed and rotor open ventilation mode by adopting axial-flow ventilation. An adopted shaft is provided with an external circumferential spiral groove, and the spiral groove matches with axial-flow fans with two clingy ends and the same spiral directions to form an axial-flow combined ventilation apparatus; the apparatus is arranged in a rotor and at two ends of the rotor, and the extra axial space of the motor is not occupied, so that the motor is compact in structure; due to different steering directions, airflow directions are also different but the motor can be cooled; in combination with labyrinth seal, a combined cooling mode of stator closed ventilation cooling and rotor open ventilation cooling of the motor is realized, and the combined cooling mode enables the insulation reliability of a stator and the heat dissipation capability of a rotor to be both ensured and improves the motor efficiency; a stator cooling air duct consists of vent holes (2x), a stator air duct (2h) and an air duct section (6h); a rotor cooling air duct consists of vent holes (5y), gaps (9b), a spiral groove (4b) and gaps (10b); the two cooling air ducts are connected in series; and the spiral combined apparatus provides air pressures for the cooling air ducts.

A ventilator provides breathing support to a patient in an EMG controlled mode, and has an input that receives an EMG signal representative of breathing activity from the patient and a control unit for controlling the ventilation in dependence of said EMG signal. The ventilator has a registration unit that registers the actual breathing support provided from the ventilator to the patient, and the control unit determines if there is asynchrony between the EMG signal and the breathing activity and, in case of asynchrony, causes a switch from EMG controlled ventilation to a second ventilation mode not dependent on the EMG signal. If synchrony is detected the ventilator can return to EMG controlled ventilation.

The invention discloses a multifunctional door or a window with the functions of insulation, ventilation and purification, which can self-realize two-way ventilation in the closed state, namely discharge the indoor contaminated air out of a room and at the same time introduce purified air into the room. During the air exchanging process, the indoor air can fully carry out latent heat and sensible heat exchanges with the introduced air through an air exchange device arranged in the window or door frame, thus guaranteeing that indoor temperature and humidity do not change. Moreover, when influenza or SARS is epidemic, the invention can switch the two-way ventilation mode to an indoor air circulation mode which uses titanium apatite loaded by the air purification device in a bypass air chute and a visual light semiconductor diode catalyst to dynamically and actively sterilize and purify the indoor air so that various viruses and bacteria in the indoor air can be removed to protect human health. In addition, the invention can use a photovoltaic cell to provide power, thus saving energy and reducing emission.

The invention aims at providing an automatic demisting system for a front windshield inner surface of an automobile. The system aims at improving automobile comfortableness and safety. The system comprises a control unit connected with a power supply circuit, an automobile ignition signal detection circuit, a fan control circuit, an air conditioner control circuit, a front windshield inner surface humidity detection circuit and an automobile inside and outside temperature detection circuit. The control unit detects ignition time of an engine through the automobile ignition signal detection circuit. When the automobile inside and outside temperature detection circuit detects that temperature difference between the inside and the outside of the automobile exceeds a preset value and the front windshield inner surface humidity detection circuit detects that the front windshield inner surface humidity exceeds the preset humidity, the control unit changes an automobile inside ventilation mode into outer circulation and utilizes the fan control circuit to control a fan to conduct demisting if the ignition time of the engine exceeds the preset time length, otherwise, the control unit changes the automobile inside ventilation mode into inner circulation and utilizes the air conditioner control circuit to control an air conditioner to conduct demisting.

The invention provides an air conditioner control method and system and the air conditioner. The control method of the air conditioner in an automatic mode comprises the steps that the outdoor environment parameter value is detected; whether the outdoor environment parameter value is larger than or equal to a first preset threshold value or not is judged; when the outdoor environment parameter value is smaller than the first preset threshold value, a fresh air mode is started, the air conditioner enters a refrigeration or heating mode, and when the outdoor environment parameter value is no smaller than the first preset threshold value, the indoor environment parameter value is detected; whether the indoor environment parameter value is larger than or equal to a first preset threshold value or not is judged; when the indoor environment parameter value is smaller than the first preset threshold value, the air conditioner is controlled to enter the refrigeration or heating mode, and when the indoor environment parameter value is no smaller than the first threshold value, the outdoor environment parameter value and the indoor environment parameter value are compared; and according to the comparison result, the ventilation mode of the air conditioner is determined. Through the air conditioner control method, the effects that the indoor air quality and the outdoor air quality are monitored in real time and compared to determine the ventilation mode of the air conditioner are achieved, the good indoor air quality is ensured, and multifunctional selection requirement of a user for the air conditioner is met.

The invention discloses a ventilation system and a ventilation method for single-cavern large-section extra-long tunnel construction. The ventilation system comprises a construction ventilation temporary partition (2) arranged on one side of a center line of a tunnel; a ratio of a sectional area of a sealed roadway formed by the construction ventilation temporary partition (2) and one side wall of the tunnel to a sectional area of a sealed roadway formed by the construction ventilation temporary partition (2) and the other side wall of the tunnel is close to 2:1; the sealed tunnel with the smaller sectional area is taken as a fresh air intake airway (4); polluted air returned from a tunnel face is discharged out of the tunnel through a polluted air discharging roadway (5) with the larger sectional area; at the outlet of a tunnel portal, the construction ventilation temporary partition (2) extends out of the portal to separate fresh air from polluted air in an area close to the portal. A jet flow tunnel ventilation mode is adopted, the difficult problem of extra-long-distance air supply during the single-cavern large-section extra-long tunnel construction is solved, the air supply efficiency for the tunnel face is effectively improved, the cost is saved, and a better economic benefit is achieved.

The invention relates to a pig manure compost preparation method capable of reducing the loss of nitrogen. The prior method fails to effectively solve and control the volatilization loss of ammonia of pig manure compost. The method controls the loss of the nitrogen during the composting of pig manure by adding bamboo charcoal and bamboo vinegar, and comprises the following concrete steps: the pig manure produced by a large-scale hoggery, a filling material, mature pig manure compost, bamboo charcoal particles, and the bamboo vinegar are mixed and placed into a composting trough, a static forced ventilation mode is adopted for composting treatment, and the compost is mature in 30 to 49 days, thereby obtaining a pig manure compost product. The filling material is saw powder or straws, and the bamboo vinegar is a bamboo vinegar stock solution. The method can reduce the loss of the nitrogen during the composting, improve the effect of the compost, and can be used for basic fertilizers or top dressing of various vegetables, melons and fruits and grain crops such as rice, wheat.

The invention, which belongs to the psychological research filed of respiratory medicine, relates to an apparatus for actively simulating autonomous respiration of a human body in vitro and a gas analyzing method employing the same. The apparatus includes a circulating gas circuit formed by a driving respirator, a dual-cavity simulation lung device and a head dead space model; and the output end of the dual-cavity simulation lung device is connected with the head dead space model by a gas analyzing device. The gas analyzing method comprises the following steps that: data are collected; integration is carried out on results by multiplication of obtained real-time oxygen concentration inside the apparatus and inspiration / expiration flow rates so as to obtain oxygen fluxes and tidal volumes of expiration / inspiration in each respiratory cycle; and division operation is carried out on the oxygen fluxes and tidal volumes to obtain mean effective inspired oxygen concentration in inspiratory / expiratory phases. According to the invention, the apparatus having a compact structure can be applied to scientific research and training of various ventilation modes; and the applied gas analyzing method enables a detection result to be accurate and to approach a real one.

The invention provides a cooling tank which comprises a tank body, a ventilation system and a refrigeration system. The box body is an incubator with heat-insulating layer and provided with at least one air inlet and at least one air outlet, where the air inlet and the air outlet are communicated with the external environment and provided with openable / closable air inlet and outlet doors respectively. The ventilation system comprises a ventilating fan and a ventilating fan motor. The refrigeration system is the device which is powered by electric energy or solar energy and can supply cold energy to the interior of a refrigeration air-conditioning cabinet and discharge heat energy out of the refrigeration air-conditioning cabinet. The inventive cooling tank runs in ventilation mode, refrigeration mode or a combination thereof; provides ventilation and cooling effect under the condition of low environmental temperature; and can cool the tank body and equipment by electrical refrigeration under the condition of high environmental temperature. Compared with prior art, the invention has the advantages of good economic efficiency, low energy consumption, reliable operation, and convenient installation and maintenance.

The invention relates to a combined underground pipeline space fire safety research model device. The device is formed by freely combining a plurality of integrated pipe gallery modules which are of the same structure and detachably assembled together. The combined module includes a variable-frequency ventilation device, a fire source device, a slope adjustment device, a fire detection device anda fire fighting system. One end of main pipe galleries is fixed on a support frame, and the other end is supported by a jack and the slope thereof can be adjusted. A mobile trolley equipped with a burning oil pan and a cable rack can slide in the pipe galleries to change the position of the fire source. The pipe gallery modules can be disassembled and assembled freely. Combined modules can be combined to form a multilayer or multi-compartment pipe gallery. After the fire detection device issues a warning, corresponding fire extinguishing media (such as water or gas) can be provided for fires of different fire source power through the control on the fire fighting system. The device provides an integrated, convenient and flexible small-size comprehensive pipe gallery scale experimental model, which can realize arbitrary combination of different pipe gallery structures, fire fighting systems, fire detection devices, ventilation modes, fire source types and pipe gallery slopes and meet theneeds of experimenters to carry out simulation experiments on the fire conditions of various complex pipe galleries.

The invention relates to the field of small-section tunnel single-head long-distance ventilation, in particular to a small-section tunnel single-head long-distance ventilation construction method. The small-section tunnel single-head long-distance ventilation construction method includes the steps of A, analyzing a pollution source, and determining the ventilation standard; B, designing a ventilation system; C, calculating tunnel ventilation parameters, selecting a draught fan, and implementing the scheme. The ventilation system is specifically characterized in that during main tunnel construction, the draught fan is arranged at an outer opening of an inclined shaft, the pressed ventilation mode is adopted, an air pipe extends into a main tunnel and is branched in the advancing directions of the two working faces of the main tunnel, jet fans are arranged on the two sides of an inner opening of the inclined shaft, and the jet directions of the jet fans face the inner opening of the inclined shaft. The small-section tunnel single-head long-distance ventilation construction method is good in ventilation effect and low in cost, and brings convenience to device maintenance and device replacement.

A ventilation flow path through which air present in an internal space at an instrument panel is drawn and discharged to the outside of the cabin as a blower fan operates is formed in a ventilation mode without forming an air-conditioning flow path for blowing inside air or outside air into the cabin and the air-conditioning flow path is formed without forming the ventilation flow path in a mode other than the ventilation mode.

An air conditioning unit includes a passage having a heat exchanger; a blower for blowing air through the passage; a blower motor driving the blower in response to a drive signal; an energy recovery ventilator (ERV), the blower drawing outside air from the ERV; and a controller for adjusting the drive signal in a ventilation mode to reduce power used by the blower motor.

The invention discloses a composite ventilation cooling system of a main transformer room, including the main transformer room, an integrated oil-immersed transformer located in the center of the maintransformer roomroom, an air inlet system located below the integrated oil-immersed transformer and near the bottom of the main transformer room, an exhaust system located at the top of the main transformer room and a control system for intelligent control, the integrated oil-immersed transformer comprises a transformer body and radiators located on both sides of the transformer body, an air inlet is arranged at the bottom of one side wall of the main transformer room and an air outlet is arranged at the top of the main transformer room. The invention makes full use of external environmentalconditions to strengthen a ventilation effect, According to the operation of transformer and indoor ventilation condition, the ventilation mode can be adjusted dynamically, the indoor air flow can flow from bottom to top orderly, the utilization efficiency of cooling air can be improved, the service time of a mechanical fan is reduced, and the ventilation energy consumption can be reduced while the ventilation heat exchange effect of the transformer room can be improved.