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  2. Patio heater - Wikipedia

    en.wikipedia.org/wiki/Patio_heater

    This article relies largely or entirely on a single source. ... Electric heaters 4 sq ft 1 foot 10,000 BTUs 1,000 Watts 16 sq ft 2 feet 36 sq ft 3 feet 64 sq ft

  3. Regenerative heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Regenerative_heat_exchanger

    A large amount of heat transfer area can be provided in each unit volume of the rotary regenerator, compared to a shell-and-tube heat exchanger - up to 1000 square feet of surface can be contained in each cubic foot of regenerator matrix, compared to about 30 square feet in each cubic foot of a shell-and-tube exchanger. [4]

  4. Infrared heater - Wikipedia

    en.wikipedia.org/wiki/Infrared_heater

    Medium-wave (MWIR) and carbon infrared heaters operate at filament temperatures of around 1,000 °C (1,830 °F). They reach maximum power densities of up to 60 kW/m 2 (5.6 kW/sq ft) (medium-wave) and 150 kW/m 2 (14 kW/sq ft) (carbon). Far infrared emitters (FIR) are typically used in the so-called low-temperature far infrared saunas. These ...

  5. British thermal unit - Wikipedia

    en.wikipedia.org/wiki/British_thermal_unit

    In the United States and Canada, the R-value that describes the performance of thermal insulation is typically quoted in square foot degree Fahrenheit hours per British thermal unit (ft 2 ⋅°F⋅h/Btu). For one square foot of the insulation, one Btu per hour of heat flows across the insulator for each degree of temperature difference across it.

  6. Ground-coupled heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Ground-coupled_heat_exchanger

    A ground-coupled heat exchanger is an underground heat exchanger that can capture heat from and/or dissipate heat to the ground. They use the Earth's near constant subterranean temperature to warm or cool air or other fluids for residential, agricultural or industrial uses.

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