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  • Modes
  • We also wanted to assess whether pulmonary artery pressures differed between children born prematurely with or without bronchopulmonary dysplasia (BPD) or between those randomized in the neonatal period to different ventilation modes. (readbyqxmd.com)
  • indoor air qua
  • Because ventilation reduces any pollutants that might have accumulated in the indoor air, this is helpful in improving indoor air quality (IAQ). (ca.gov)
  • In many instances, ventilation for indoor air quality is simultaneously beneficial for the control of thermal comfort. (wikipedia.org)
  • At these times, it can be useful to increase the rate of ventilation beyond the minimum required for indoor air quality. (wikipedia.org)
  • In other instances, ventilation for indoor air quality contributes to the need for - and energy use by - mechanical heating and cooling equipment. (wikipedia.org)
  • When a building design relies on environmentally driven circumstantial infiltration to maintain indoor air quality, this flow has been referred to as adventitious ventilation. (wikipedia.org)
  • One benefit of displacement ventilation is possibly the superior indoor air quality achieved with exhausting contaminated air out of the room. (wikipedia.org)
  • The benefit of using energy recovery is the ability to meet the ASHRAE ventilation & energy standards, while improving indoor air quality and reducing total HVAC equipment capacity. (wikipedia.org)
  • Design engineers reference a codified standard when determining ventilation set points in order for sensors or time schedules and control loops to achieve indoor air quality. (wikipedia.org)
  • Common reference standards for ventilation: ISO ICS 91.140.30: Ventilation and air-conditioning systems ASHRAE 62.1 & 62.2: The standards for Ventilation and Indoor Air Quality Timed schedules Motion sensors (various technologies including: Audible sound, inaudible sound, infrared) Gas detection (CO2) In a survey on Norwegian schools, using CO2 sensors for DCV was found to reduce energy consumption by 62% when compared with a constant air volume (CAV) ventilation system. (wikipedia.org)
  • ASHRAE
  • ASHRAE now recommends ventilation rates dependent upon floor area, as a revision to the 62-2001 standard, in which the minimum ACH was 0.35, but no less than 15 CFM/person (7.1 L/s/person). (wikipedia.org)
  • system
  • Heating and/or cooling systems in homes typically recirculate the same air after treating (heating or cooling) and are thus not part of an actual ventilation system because they do not bring in outdoor air. (ca.gov)
  • A mine's primary ventilation system is designed to dilute and control these accumulations. (cdc.gov)
  • However, increased production from larger longwall panels is challenging the limits of modern and accepted ventilation system designs to maintain safe working conditions. (cdc.gov)
  • In addition, ventilation models were used to investigate the effects of larger panels and increased production rates on bleeder ventilation system designs to control methane accumulations on the longwall face and at the tailgate corner. (cdc.gov)
  • However, use of this design can greatly increase the complexity of the ventilation system. (cdc.gov)
  • Research will continue to quantify the effect of ventilation system design on the control of methane, particularly at the longwall tailgate corner. (cdc.gov)
  • Work will also evaluate support methods to maintain the integrity of the tailgate entry closest to the gob and to assess the robustness of the ventilation system to handle fluctuations in gob gas emissions during periods of low barometric pressure. (cdc.gov)
  • It could be the ventilation system. (homeenergy.org)
  • Many mechanically ventilated buildings use a combination of both, with the ventilation being integrated into the HVAC system. (wikipedia.org)
  • Mechanical ventilation refers to any system that uses mechanical means, such as a fan, to introduce subaerial air to a space. (wikipedia.org)
  • The fan for the ventilation system may be located within the kitchen or in the duct system nearby. (wikipedia.org)
  • With this type of system, it is normal, during the cooling seasons, for the exhaust air to be cooler than the ventilation air and, during the heating seasons, warmer than the ventilation air. (wikipedia.org)
  • building's
  • In architecture, an airshaft is a small, vertical space within a tall building which permits ventilation of the building's interior spaces to the outside. (wikipedia.org)
  • HRV systems provide ventilation without the loss of heat or humidity, which could put stress on a building's heating, ventilating/ventilation, and air conditioning (HVAC) systems. (wikipedia.org)
  • alveolar
  • Excretion of carbon dioxide is also impaired, but a rise in the arterial partial pressure of carbon dioxide (paCO 2 ) is very uncommon because this leads to respiratory stimulation and the resultant increase in alveolar ventilation returns paCO 2 to within the normal range. (wikipedia.org)
  • Optimal PEEP is used to maintain alveolar inflation and promote ventilation-to-perfusion matching. (wikipedia.org)
  • airway
  • Due to the anatomy of the human pharynx, larynx, and esophagus and the circumstances for which ventilation is needed, additional measures are often required to secure the airway during positive-pressure ventilation in order to allow unimpeded passage of air into the trachea and avoid air passing into the esophagus and stomach. (wikipedia.org)
  • Non-invasive ventilation (NIV) is the use of airway support administered through a face (nasal) mask instead of an endotracheal tube. (wikipedia.org)
  • inhalation
  • Sends stimulatory impulses to the inspiratory area - activates and prolongs inhalations Overridden by pneumotaxic control from the apneustic area to end inhalation Ventilation is normally unconscious and automatic, but can be overridden by conscious alternative patterns. (wikipedia.org)
  • dilute
  • Properly designed ventilation can dilute particles and gases in indoor air and prevent contaminants from accumulating to levels that may cause health or comfort problems. (ca.gov)
  • infiltration
  • Dynamic pressure is the pressure exerted when the wind comes into contact with an object such as a hill or a building and it is described by the following equation: q = 1 2 ρ v 2 , {\displaystyle q={\tfrac {1}{2}}\,\rho \,v^{2},} where (using SI units): The impact of wind on a building affects the ventilation and infiltration rates through it and the associated heat losses or heat gains. (wikipedia.org)
  • HVAC
  • Energy recovery ventilation (ERV) is the energy recovery process of exchanging the energy contained in normally exhausted building or space air and using it to treat (precondition) the incoming outdoor ventilation air in residential and commercial HVAC systems. (wikipedia.org)
  • concentrations
  • Finally, monitoring of outgassing events from a large sealed gob was used to determine seal leakage rates and changes in gas concentrations in the ventilation air during periods of low barometric pressure. (cdc.gov)
  • ventilators
  • The adverse side effects noted during the use of high-frequency ventilation include those commonly found during the use of conventional positive pressure ventilators. (wikipedia.org)
  • systems
  • Adequate control of methane is particularly acute in longwall operations using bleeder ventilation systems, especially at the tailgate corner where methane accumulations are most likely to occur. (cdc.gov)
  • Mixed mode ventilation systems use both mechanical and natural processes. (wikipedia.org)
  • In many healthcare systems, prolonged ventilation as part of intensive care is a limited resource (in that there are only so many patients that can receive care at any given moment). (wikipedia.org)
  • buildings
  • Most offices and other larger buildings, and many schools, have mechanical ventilation. (ca.gov)
  • Exhaust-only ventilation is one of the most common strategies for single-family and multifamily buildings alike. (homeenergy.org)
  • The ventilation rate, for CII buildings, is normally expressed by the volumetric flowrate of subaerial air, introduced to the building. (wikipedia.org)
  • Nearly half of global energy is used in buildings, and half of heating/cooling cost is caused by ventilation when it is done by the "open window" method according to the regulations [define method and include citation]. (wikipedia.org)
  • involves
  • Mechanical ventilation is termed "invasive" if it involves any instrument penetrating through the mouth (such as an endotracheal tube) or the skin (such as a tracheostomy tube). (wikipedia.org)
  • Mechanical ventilation is termed "invasive" if it involves any instrument penetrating the trachea through the mouth, such as an endotracheal tube or the skin , such as a tracheostomy tube. (wikipedia.org)
  • Ventilation is a part of structural firefighting tactics, and involves the expulsion of heat and smoke from a fire building, permitting the firefighters to more easily and safely find trapped individuals and attack the fire. (wikipedia.org)
  • occurs
  • Buoyancy-driven ventilation occurs as a result of the directional buoyancy force that results from temperature differences between the interior and exterior. (wikipedia.org)
  • Tracheal
  • These adverse effects include: Pneumothorax Pneumopericardium Pneumoperitoneum Pneumomediastinum Pulmonary interstitial emphysema Intraventricular hemorrhage Necrotizing tracheobronchitis Bronchopulmonary dysplasia High-frequency jet ventilation is contraindicated in patients requiring tracheal tubes smaller than 2.5 mm ID. (wikipedia.org)