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  2. Steam cracking - Wikipedia

    en.wikipedia.org/wiki/Steam_cracking

    This degrades the efficiency of the reactor, so reaction conditions are designed to minimize this. Nonetheless, a steam cracking furnace can usually only run for a few months at a time between de-cokings. Decokes require the furnace to be isolated from the process and then a flow of steam or a steam/air mixture is passed through the furnace coils.

  3. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    After the control of air flow and temperature was standardized, the use of electromechanical relays in ladder logic to switch dampers became standardized. Eventually, the relays became electronic switches, as transistors eventually could handle greater current loads. By 1985, pneumatic controls could no longer compete with this new technology ...

  4. Time to first fix - Wikipedia

    en.wikipedia.org/wiki/Time_to_first_fix

    The TTFFs for a cold start is typically between 2 and 4 minutes, a warm start is 45 seconds (or shorter), and a hot start is 22 seconds (or only a few seconds). [2] In older hardware where satellite search is slower, a cold start may take more than the full 12.5 minutes.

  5. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Clean air delivery rate (CADR) is the amount of clean air an air cleaner provides to a room or space. When determining CADR, the amount of airflow in a space is taken into account. For example, an air cleaner with a flow rate of 30 cubic metres (1,000 cu ft) per minute and an efficiency of 50% has a CADR of 15 cubic metres (500 cu ft) per minute.

  6. Cold start (automotive) - Wikipedia

    en.wikipedia.org/wiki/Cold_start_(automotive)

    A cold start can be difficult for an engine due to higher viscosity of oil and fuel in cold temperatures. Generally speaking, diesel engines have more difficulty starting at low outside temperatures than gasoline engines, and electric engines have the most problems. Diesel engines do not use spark plugs to ignite the air fuel mixture and rely ...

  7. 6 of the Most Common Home Renovations — Are They Worth It ...

    www.aol.com/finance/6-most-common-home...

    If you’re planning to stay in the home, a smart thermostat or security system can make life easier and even save money in the long run. But for resale value, it’s not usually a make-or-break ...

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