![]() In thermal radiation, heat is transferred by electromagnetic waves that travel in straight lines and can be reflected. Radiant heating and cooling applications are classified as panel heating or cooling if the panel surface temperature is below 300☏ (150☌), and as low-, medium-, or high-intensity radiant heating if the surface or source temperature exceeds 300☏ (150☌). HVAC Applications Ch 55: Radiant Heating and Cooling More information about infrared heating can be found in Chapter 16 of the same volume. Detailed information about slab heating can be found in Chapter 6 of the 2012 ASHRAE Handbook-HVAC Systems and Equipment. This chapter covers three types of snow-melting and freeze protection systems: (1) hot fluid circulated in slab-embedded pipes (hydronic) (2) embedded electric heater cables or wire and (3) overhead high-intensity infrared radiant heating. HVAC Applications, Ch 52: Snow Melting and Freeze Protection The energy source may be liquid, solid, gaseous, or electric. In-space heaters may be either permanently installed or portable and may transfer heat by a combination of radiation, natural convection, and forced convection. In-space heating equipment differs from central heating in that fuel is converted to heat in the space to be heated. (Equipment with source temperatures starting from below the indoor air temperature to 300☏ is classified as panel heating and cooling equipment, discussed in Chapter 6.) ![]() Infrared radiant heating principles discussed in this chapter apply to equipment with thermal radiation source temperatures ranging from 300 to 5000☏ (150 to 2760☌). HVAC Systems & Equipment, Ch 16: Infrared Radiant Htg Chapter 16 covers high-temperature panels over 300☏ (150☌), which maybe energized by gas, electricity, or high-temperature water. For snow-melting and freeze-protection applications, see Chapter 51 of the 2011 ASHRAE Handbook-HVAC Applications. This chapter covers temperature-controlled surfaces that are the primary source of sensible heating and cooling in the conditioned space. HVAC Systems & Equipment, Ch 6: Radiant Heating & Cooling The ASHRAE Handbook is published in a series of four volumes, one of which is revised each year, ensuring that no volume is older than four years. Devin Abellon is the current Handbook Sub-committee Chair, please get in touch with him directly if you have questions regarding the handbook chapters or would like to volunteer to work on the content for upcoming chapter revisions.
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