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  2. NTU method - Wikipedia

    en.wikipedia.org/wiki/NTU_Method

    The number of transfer units (NTU) method is used to calculate the rate of heat transfer in heat exchangers (especially parallel flow, counter current, and cross-flow exchangers) when there is insufficient information to calculate the log mean temperature difference (LMTD).

  3. How much more will it cost to heat your home this winter? - AOL

    www.aol.com/much-more-cost-heat-home-222057750.html

    On average, spending on home heating this winter is projected to increase by 8.7% to $941, up from $866 last winter. The increased costs are attributed in part to both expected colder temperatures ...

  4. District heating substation - Wikipedia

    en.wikipedia.org/wiki/District_heating_substation

    Heat exchanger - to split primary and secondary side of the system; Control valve - to regulate the flow through the heat exchanger; Heat meter - to measure energy consumption and allocate costs; Strainer - to remove particles that could block heat exchanger or control valve; Shutdown valve - to stop the flow on primary side in case of service ...

  5. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    External heat exchanger of an air source heat pump. An air source heat pump can be used to air condition the building during hot weather, and to warm the building using heat extracted from outdoor air in cold weather. Air-source heat pumps are generally uneconomic for outdoor temperatures much below freezing.

  6. Heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Heat_exchanger

    Tubular heat exchanger Partial view into inlet plenum of shell and tube heat exchanger of a refrigerant based chiller for providing air-conditioning to a building. A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. [1]

  7. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    By comparison, most modern "warm air" furnaces typically use a fan to circulate air to the rooms of house and pull cooler air back to the furnace for reheating; this is called forced-air heat. Because the fan easily overcomes the resistance of the ductwork, the arrangement of ducts can be far more flexible than the octopus of old.