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.

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.

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 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.

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 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 discloses a mine working face simulation experimental device. The device comprises a simulate roadway, an underground simulate apparatus, a simulate dust source, a dust removing fan, a spraying water supply device, an air velocity sensor and a dust concentration sensor. The simulate roadway is adopted for the mine working face simulation experimental device, and the airflow, dust and spray conditions of the mine working face are simulated in the simulate roadway by use of the underground simulate apparatus, the simulate dust source, the dust removing fan and the spraying water supply device and then related data in the simulate roadway are measured by use of the air velocity sensor and the dust concentration sensor, and consequently, the rules of migration, coupling and settling of air, dust and fog in different ventilation modes are determined and the optical effects of dust removal by ventilation and spraying dust suppression of the mine working face are obtained so as to provide reliable technical support for scientifically and reasonably arranging ventilating and spraying dust suppression systems, determining the optimal spraying pressure, controlling the air velocity to realize the optimal spraying effect and detecting the dust suppression effect of the spraying device, and developing a high-efficiency nozzle.

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 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.