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ESIDENZIALE

Underfloor systems are certainly the best known radiant

systems.

They can be realised with different types of products that,

depending on their characteristics, result in systems that are

more or less efficient systems in terms of thermal output and

are more or less practical to install.

However, one important parameter that characterises these

systems has always been poorly analysed, to the extent that

UNI EN 1264-3 standard says it is not necessary to take into

account: thermal inertia.

However, regulatory developments in terms of energy savings

and technical evolution in terms of products for screeds have

now made thermal inertia a critical parameter; in fact, as early as

the design stage it is worth taking it into consideration in order

to choose the system that best fits the needs of the building.

On this basis, we distinguish radiant underfloor systems

primarily based on their thermal inertia, grouping them in the

following pages of this chapter into three large families, which

we will now analyse.

Low-inertia residential systems

Today, new buildings and well-renovated buildings have a

common fundamental characteristic: low thermal loads in the

winter season. These are the so-called buildings in class B, A

or higher.

Often the only relevant loads remain those of the summer

season, due to the presence of the sun, or the people who

occupy the building, and the electrical equipment that is used.

These loads are characterised by a high variability, being able

to change very quickly.

A building with low winter loads requires a heating system that

can be controlled efficiently and quickly, in order to prevent

the building from overheating once the condition of comfort is

reached.

In turn, a building with highly variable summer loads requires

an air conditioning system that can be controlled efficiently and

quickly, in order to quickly cool a space in which the loads are

quickly increased.

To do this, the heating and/or cooling system must have low

thermal inertia.

Underfloor systems that are able to meet this need are either

dry systems or those that can exploit the new materials made

available by technical evolution in the construction industry.

These are products that are compatible with screeds with a

single centimetre of thickness over the pipe and that, given their

recent evolution, are not yet considered by the UNI EN 1264

standard that, while it considers the use of special products,

in fact, remains written for systems with traditional sand and

cement screeds.

The thermal response of these systems, starting from the

system turned off, is on the order of tens of minutes to reach

full capacity.

The Chemidro systems that allow realising low-inertia systems

are the RENOVA and RENOVA ULTRA systems.

These systems are applicable to residential buildings, offices,

commercial spaces, schools and health facilities.

LOW-INERTIA RESIDENTIAL SYSTEM

Screed of 31 mm

Screed 31 mm

Renova Panel

Multilayer pipe

Adhesive expansion edge strip H150

SISTEMA RESIDENZIALE A BASSA INERZIA

2. Types of underfloor radiant

systems

16

Underfloor Radiant Systems - Product Guide

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