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  2. Heat recovery ventilation - Wikipedia

    en.wikipedia.org/wiki/Heat_recovery_ventilation

    Heat recovery ventilation (HRV), also known as mechanical ventilation heat recovery (MVHR) is a ventilation system that recovers energy by operating between two air sources at different temperatures. It is used to reduce the heating and cooling demands of buildings.

  3. Dedicated outdoor air system - Wikipedia

    en.wikipedia.org/wiki/Dedicated_outdoor_air_system

    DOAS air handling unit with heat recovery wheel and passive dehumidification. A dedicated outdoor air system (DOAS) is a type of heating, ventilation and air-conditioning system that consists of two parallel systems: a dedicated system for delivering outdoor air ventilation that handles both the latent and sensible loads of conditioning the ventilation air, and a parallel system to handle the ...

  4. How to keep your cool under pressure, according to experts

    www.aol.com/news/keep-cool-under-pressure...

    By working on resonance frequency breathing, a slow diaphragmatic breathing that is usually three to seven breaths per minute and synchronizes with your heart rate, the HRV will increase, which ...

  5. Thermal wheel - Wikipedia

    en.wikipedia.org/wiki/Thermal_Wheel

    Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...

  6. Heart rate variability - Wikipedia

    en.wikipedia.org/wiki/Heart_rate_variability

    Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat ...

  7. What Is Heart Rate Variability & How Does it Relate to Weight?

    www.aol.com/lifestyle/heart-rate-variability...

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  8. HRV - Wikipedia

    en.wikipedia.org/wiki/HRV

    Honda HR-V, a sport utility vehicle; HRV, a Rockwell scale of materials' hardness; See also. All pages with titles beginning with HRV; All pages with titles ...

  9. Trump to issue executive order defining sex as ‘male and ...

    www.aol.com/news/trump-executive-order-define...

    President Trump will on his first day in office Monday issue an order defining a person's sex as "male or female" — requiring government agencies to use the "immutable" designation on forms and ...