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Copyright Valsir-Uneeq 2013
Valsir-Uneeq - 49 Brunton Circle, Foundersview South, Modderfontein - Gauteng - South Africa
Radiant system  Underfloor heating and cooling is a form of central heating and cooling which achieves indoor climate control for  thermal comfort using conduction, radiation and convection. The terms radiant heating and radiant cooling are  commonly used to describe this approach because radiation is responsible for a significant portion of the resulting  thermal comfort but this usage is technically correct only when radiation composes more than 50% of the heat  exchanged between the floor and the rest of the space.  Description  Modern underfloor heating systems use either electrical resistance elements ("electric systems") or fluid flowing in  pipes ("hydronic systems”) to heat the floor. Either type can be installed as the primary, whole-building heating system  or as localized floor heating for thermal comfort. Electrical resistance can only be used for heating so when space  cooling is also required, hydronic systems are used. Other applications for which either electric or hydronic systems are  suited include snow/ice melting for walks, driveways and landing pads, turf conditioning of football and soccer fields  and frost prevention in freezers and skating rinks.  Electric heating elements or hydronic piping can be cast in a concrete floor slab ("poured floor system" or "wet  system"). They can also be placed under the floor covering ("dry system") or attached directly to a wood sub floor ("sub  floor system" or "dry system"). Some commercial buildings are designed to take advantage of thermal mass which is heated or cooled during off peak  hours when utility rates are lower. With the heating/cooling system turned off during the day, the concrete mass and  room temperature drift up or down within the desired comfort range. Such systems are known as thermally activated  building systems or TABS. Hydronic systems  Hydronic systems use water or a mix of water and anti-freeze such as propylene glycol as the heat transfer fluid in a  "closed loop" that is recirculated between the floor and the boiler.  Various types of pipes are available specifically for hydronic underfloor heating and cooling systems and are generally  made from polyethylene including PEX, PEX-Al-PEX.   Hydronic systems require skilled designers and trades people familiar with boilers, circulators, controls, fluid pressures  and temperature. The use of modern factory assembled sub-stations, used primarily in district heating and cooling, can  greatly simplify design requirements and reduce the installation and commissioning time of hydronic systems.  Hydronic systems can use a single source or combination of energy sources to help manage energy costs. Hydronic  system energy source options are: Heatpumps or Solar / Heatpump combination.  Advantages  Greater energy saving as compared to traditional systems  Uniform distribution of room temperatures  Less heat loss as compared to traditional heating systems Greater thermal well-being  No limits to architectural design Great reliability and flexibility to all types of building and construction requirements  Elevated heating surfaces  No irritated throats due to optimum hygiene conditions  No dust deposits Residential A system designed for applications in residential buildings (flats, detached houses, etc.), which is so versatile that can  also be installed in offices or places of worship.  Industrial-commercial system This system uses a smooth panel with excellent compressive strength considering the major loads normally withstood  by industrial and commercial flooring. The pipe can also be laid on insulating cast concrete using clips paired to metal  mesh.
Radiant Systems