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  2. Daikin - Wikipedia

    en.wikipedia.org/wiki/Daikin

    As of April 2014, Daikin Hydraulics marketed a line of piston pumps, vane pumps, manual pumps, solenoid valves, and flow and control valves, claiming their pump technology to be 50–70 percent more energy efficient than conventional technology. [20]

  3. Air handler - Wikipedia

    en.wikipedia.org/wiki/Air_handler

    Run around coil: Two air to liquid heat exchanger coils, in opposing airstreams, piped together with a circulating pump and using water or a brine as the heat transfer medium. This device, although not very efficient, allows heat recovery between remote and sometimes multiple supply and exhaust airstreams. Heat recovery efficiency up to 50%.

  4. Heat pump and refrigeration cycle - Wikipedia

    en.wikipedia.org/wiki/Heat_pump_and...

    Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. [1] A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature. [2]