page_title: Radiant heating and cooling
section_title: Types (ISO 11855)
hierarchical_section_title: Radiant heating and cooling / Hydronic radiant systems / Types (ISO 11855)
caption_attribution_description: This file represents hydronic radiant system type F as described in the standard ISO 11855 English: &#160;This file represents hydronic radiant system type F as described in the standard ISO 11855
context_page_description: Radiant heating and cooling is a category of HVAC technologies that exchange heat by both convection and radiation with the environments they are designed to heat or cool. There are many subcategories of radiant heating and cooling, including: "radiant ceiling panels", "embedded surface systems", "thermally active building systems", and infrared heaters. According to some definitions, a technology is only included in this category if radiation comprises more than 50% of its heat exchange with the environment; therefore technologies such as radiators and chilled beams are usually not considered radiant heating or cooling. Within this category, it is practical to distinguish between high temperature radiant heating, and radiant heating or cooling with more moderate source temperatures. Moderate temperature radiant heating and cooling is usually composed of relatively large surfaces that are internally heated or cooled using hydronic or electrical sources. For high temperature indoor or outdoor radiant heating, see: Infrared heater. For snow melt applications see: Snowmelt system.
context_section_description: The norm ISO 11855-2
  focuses on embedded water based surface heating and cooling systems and TABS. Depending on construction details, this norm distinguishes 7 different types of those systems (Types A to G)
  Type A with pipes embedded in the screed or concrete (“wet” system)
  Type B with pipes embedded outside the screed (in the thermal insulation layer, “dry” system)
  Type C with pipes embedded in the leveling layer, above which the second screed layer is placed
  Type D include plane section systems (extruded plastic / group of capillary grids)
  Type E with pipes embedded in a massive concrete layer
  Type F with capillary pipes embedded in a layer at the inner ceiling or as a separate layer in gypsum
  Type G with pipes embedded in a wooden floor construction
caption: Section diagram of radiant capillary system (ISO 11855, type F)
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