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2. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

3. Automotive air conditioning - Wikipedia

   en.wikipedia.org/wiki/Automotive_air_conditioning

   A regular, professional hygiene check of a vehicle's air conditioning system includes checking the drain lines for the condensation water, annual cleaning of the air conditioning system evaporator and changing the interior air filter (pollen filter). In particular, the unhindered drainage of the condensation water from the air conditioning ...

4. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   This is partly because ice forms on the outdoor unit's heat exchanger coil, which blocks air flow over the coil. To compensate for this, the heat pump system must temporarily switch back into the regular air conditioning mode to switch the outdoor evaporator coil back to the condenser coil, to heat up and defrost. Therefore, some heat pump ...

5. 3 Winter Sleep Problems & How to Fix Them - AOL

   www.aol.com/3-winter-sleep-problems-fix...

   A humidifier emits water vapor to keep the air moist, which will help alleviate the symptoms of dryness and irritation. It may even help you sleep better and curb your risk of getting the flu .

6. Switchgear - Wikipedia

   en.wikipedia.org/wiki/Switchgear

   High-voltage switchgear A section of a large switchgear panel. Tram switchgear This circuit breaker uses both SF 6 and air as insulation.. In an electric power system, a switchgear is composed of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment.

7. Ohio corrections officer killed on Christmas Day in 'inmate ...

   www.aol.com/ohio-corrections-officer-killed...

   A corrections officer at an Ohio prison was killed Christmas day when an inmate attacked him, authorities said Wednesday. The assault occurred Wednesday morning at the Ross Correctional ...

8. Radio Host Rescued from River After Trying to Save Dog from ...

   www.aol.com/radio-host-rescued-river-trying...

   A British radio host has been dubbed a hero without a cape after attempting to save a dog from a river. Jordan North, who hosts Capital Breakfast, was running along the banks of the River Thames ...

9. Circuit breaker - Wikipedia

   en.wikipedia.org/wiki/Circuit_breaker

   This increases the availability, since open-air disconnecting switch main contacts need maintenance every 2–6 years, while modern circuit breakers have maintenance intervals of 15 years. Implementing a DCB solution also reduces the space requirements within the substation, and increases the reliability , due to the lack of separate disconnectors.