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  2. Chlorodifluoromethane - Wikipedia

    en.wikipedia.org/wiki/Chlorodifluoromethane

    HCCl 3 + 2 HF → HCF 2 Cl + 2 HCl. An important application of R-22 is as a precursor to tetrafluoroethylene. This conversion involves pyrolysis to give difluorocarbene, which dimerizes: [3] 2 CHClF 2 → C 2 F 4 + 2 HCl. The compound also yields difluorocarbene upon treatment with strong base and is used in the laboratory as a source of this ...

  3. Condenser (heat transfer) - Wikipedia

    en.wikipedia.org/wiki/Condenser_(heat_transfer)

    The condenser coil of a refrigerator. In systems involving heat transfer, a condenser is a heat exchanger used to condense a gaseous substance into a liquid state through cooling. In doing so, the latent heat is released by the substance and transferred to the surrounding environment. Condensers are used for efficient heat rejection in many ...

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  5. Surface condenser - Wikipedia

    en.wikipedia.org/wiki/Surface_condenser

    Where cooling water is in short supply, an air-cooled condenser is often used. An air-cooled condenser is however, significantly more expensive and cannot achieve as low a steam turbine exhaust pressure (and temperature) as a water-cooled surface condenser. Surface condensers are also used in applications and industries other than the ...

  6. Compound engine - Wikipedia

    en.wikipedia.org/wiki/Compound_engine

    Note however that in the case of any steam engine, simple engine can also be used to mean one that does not use a condenser to generate negative pressure and so improve efficiency. Use of separate condensers for this purpose is one of the key features that distinguishes the Watt steam engine of 1765 from the Newcomen steam engine of 1712.

  7. Hackers find hole in Krispy Kreme Doughnuts' cyber-security

    www.aol.com/news/hackers-hole-krispy-kreme...

    Get some last-minute shopping done at the Kate Spade Outlet sale — up to 70% off plus an extra 25% off select gifts. AOL. The 20 best gifts to give someone you don't know very well. AOL.

  8. Fan coil unit - Wikipedia

    en.wikipedia.org/wiki/Fan_coil_unit

    These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.

  9. Trump transition team member says former Rep. Mike ... - AOL

    www.aol.com/trump-transition-team-member-says...

    Trump, 78, had planned if re-elected to fire FBI Director Christopher Wray, whom the 45th president picked for the job in August 2017, after investigators raided his Mar-a-Lago estate in August ...

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