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  2. Direct exchange geothermal heat pump - Wikipedia

    en.wikipedia.org/wiki/Direct_exchange_geothermal...

    DX system being drilled in the 1980s. A direct exchange (DX) geothermal heat pump is a type of ground source heat pump in which refrigerant circulates through copper tubing placed in the ground unlike other ground source heat pumps where refrigerant is restricted to the heat pump itself with a secondary loop in the ground filled with a mixture of water and anti-freeze.

  3. DX - Wikipedia

    en.wikipedia.org/wiki/DX

    dx, in calculus, a differential in Leibniz's notation of a variable x Direct exchange (DX), direct exchange geothermal heat pump , an energy-efficiency environmental control cooling technology Yamaha DX Series , FM synthesizers produced by Yamaha Corporation

  4. U.S. Dollar Index - Wikipedia

    en.wikipedia.org/wiki/U.S._Dollar_Index

    The U.S. Dollar Index (USDX, DXY, DX, or, informally, the "Dixie") is an index (or measure) of the value of the United States dollar relative to a basket of foreign currencies, [1] often referred to as a basket of U.S. trade partners' currencies. [2] The Index goes up when the U.S. dollar gains "strength" (value) when compared to other ...

  5. DXing - Wikipedia

    en.wikipedia.org/wiki/DXing

    DXing, taken from DX, the telegraphic shorthand for "distance" or "distant", [1] is the hobby of receiving and identifying distant radio or television signals, or making two-way radio contact with distant stations in amateur radio, citizens band radio or other two-way radio communications.

  6. 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 ...

  7. List of optometric abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_optometric...

    Dx Diagnosis dDx Differential diagnosis DR Diabetic retinopathy: ERM ... Unit of permeability DW Daily wear EW Extended wear FOZD Front optic zone diameter FVP

  8. Diffusion current - Wikipedia

    en.wikipedia.org/wiki/Diffusion_current

    where D is the diffusion coefficient for the electron in the considered medium, n is the number of electrons per unit volume (i.e. number density), q is the magnitude of charge of an electron, μ is electron mobility in the medium, and E = −dΦ/dx (Φ potential difference) is the electric field as the potential gradient of the electric potential.

  9. TV and FM DX - Wikipedia

    en.wikipedia.org/wiki/TV_and_FM_DX

    TV DX and FM DX is the active search for distant radio or television stations received during unusual atmospheric conditions. The term DX is an old telegraphic term ...