:: Glossary
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Technical Recommendation |
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Authorized by the CSTB, which validates the suitability
for use of a product, component or system destined for the
construction industry. The following do not require Technical
Recommendations: Boilers, Thermodynamic Generators, and Underground
Sensors. The following require Technical Recommendations:
Radiant floor pipes, ground installation system (the ground
cannot be dissociated from the generator and the sensor).
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Underground sensor |
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A network of underground pipes in a garden which make it possible
to take natural energy from the ground.
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Refrigerant circuit |
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An enclosed circuit which contains refrigerant liquid. The
4 main components of a refrigerant circuit are the compressor,
the condenser, the pressure regulator and the evaporator.
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Collector |
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A distribution device which regulates the different circuits
of a radiant floor system.
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Compressor |
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The mechanical component of the refrigerant circuit which
makes it possible to transfer the energy from the ground outside
towards the interior of the building.
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Condensation |
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A change of state of the refrigerant liquid, which passes
from the gaseous to the liquid state, giving off energy at the
place which it is desired to heat.
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Condenser |
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An exchanger in which the refrigerant liquid condenses.
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Coefficient
of Performance (C.O.P.) |
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This is the relation between the power supplied and the power
absorbed. It is a measurement of the efficiency of a generator.
A COP of 3.7 means that a generator supplies 3.7 times more
energy than it consumes.
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C.S.T.B.
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The Scientific and Technical Centre for the Building Industry.
This is a public establishment of an industrial and commercial
nature. One of the roles of the CSTB consists of assisting the
public authorities in the preparation of technical regulations.
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Degree - days (DJU) |
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The sum of the products “difference in temperature x number
of days at this temperature”, and which characterizes the rigour
of a climate.
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Losses or leakages |
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The total of heat losses from a house. In general:
- 30 % through the roof,
- 15 % through the walls,
- 15 % through the doors and windows,
- 15 % through the floor,
- 20 % through changes of air
- 5 % through heat bridges
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Pressure regulator |
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Regulates the flow of refrigerant liquid in the refrigerant
circuit.
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Direct pressure regulator |
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An underground sensor in the form of a copper tube with a
polyethylene sleeve, which makes up the evaporator, and through
which the refrigerant liquid flows.
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Unified Technical Document (U.T.D.) |
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The Unified Technical Document defines the rules that must
be respected for carrying out the work. For thermal floor systems,
the relevant U.T.Ds bear the following code numbers:
65-6 or 52-301
65-8 or 52-303
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The water-table |
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Water contained in the sub-soil, in general at a temperature
of between 10° and 14°, and which in some cases replaces the
underground sensor.
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Glycol water |
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Water mixed with glycol-based antifreeze which fills an underground
sensor, and makes it possible to cool the ground to negative
temperatures.
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Water-water system |
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A system that takes the energy from the water of the water-table,
from a horizontal sensor or from thermal probes, and which uses
heating with hot water inside the home.
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Thermal study |
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A detailed study of the insulation applied in a particular
home and the definition of the heating power to be installed,
and of the consumption levels.
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Evaporator |
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An exchanger in which the refrigerant liquid evaporates.
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Evaporation |
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A change of state of the refrigerant liquid, which passes
from the liquid to the gaseous state, taking energy in the area
which needs to be cooled down.
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Refrigerant liquid |
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Liquid which fills the refrigerant circuit and enables heat
to be transferred from a zone to be cooled to a zone to be heated.
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Ice |
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It is only the change of state from water to ice that is most
apparent. However heat can be extracted from ice at temperatures
as low as -273.15°c.
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Cycle reverser |
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An underground sensor in the form of a copper tube with a
polyethylene sleeve, which makes up the evaporator, and through
which the refrigerant liquid flows.
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Cold wall |
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In a heated building, the cold wall is a wall the temperature
of which is lower than that of the general temperature of the
building. The radiant floor system makes it possible to eliminate
the only cold wall with which the occupants of a house are in
contact.
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Low temperature floor |
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A radiant floor characterized by the fact that the floor temperature
is between 22¾ and 25¾, with a maximum of 28¾.
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