In order to evaluate the time response of the effidur floor system WP 1000 a heating-up chart has been recorded showing the time dependent behaviour of the surface temperatures and the heat flow density of the underfloor heating area.

Based on a non-operating state of the effidur floor system with 20 °C, the heat water flow has been activated and the flow temperature has been increased to 32 °C in order to reach an average surface temperature of approximately 28 °C. The results are shown in the charts.

It became apparent that already 19 minutes after activating the heat water flow 63.2 % of the total licit output had been reached as requested for comparing. Hereby the effidur floor system requires a two-minute initiation period (T_t) and 17 minutes pure heating-up time (T₁).

thermal resistivity of flooring R λ,B in m²K/W 0,00 0,05 0,1 0,15 characteristic curves of floor system q = KH × δϑ KH in W/m²K 7,089 5,294 4,224 3,514 limit of specific thermal output for residential areas ϑF,max - ϑi = 9 K qG1 in W/m² 83,1 86,2 89,6 93,2 ΔϑG1 in K 11,72 16,29 21,21 26,53 limit of specific thermal output for border areas ϑF,max - ϑi = 15 K qG2 in W/m² 145,7 151,2 157,1 163,5 ΔϑG2 in K 20,56 28,57 37,2 46,53 heat transfer coefficient underfloor heating » αF = 10,8 W/m²K Klima WP 1000 including 5 mm system screed (SFM) overlap, heating pipe 8 x 1,1 mm, pipe distance 120 mm

Example calculations» at 20 °C room temperature

MAXIMUM FLOOR SURFACE TEMPERATURES acc. to DIN EN 1264

In order to avoid excessive surface temperatures, the flow temperature of floor systems with integrated heating needs to be set accordingly.

• lounge areas up to 29 °C
• bath rooms up to 33 °C
• border areas up to 35 °C

Time-dependent heat spreading (data in minutes) – tested and confirmed by MFPA Leipzig [Leipzig Institute for Materials Research and Testing].

thermal resistivity of flooring Rλ,B in m²K/W 0,00 0,05 0,1 0,15 characteristic curves of floor system q = KK × δϑ KK in W/m²K 4,98 4,04 3,39 2,91 cooling flow densitiy at δϑ = 8 K qG in W/m² 39,9 32,3 27,1 23,3 heat transfer coefficient underfloor cooling» αF = 6,50 W/m²K Klima WP 1000 including 5 mm system screed (SFM) overlap, heating pipe 8 x 1,1 mm, pipe distance 120 mm

Example calculation»
thermal resistivity R _λ,B = 0 m² K/W; room temperature 26 °C

The cooling flow density has been determined based on the basic characteristic curve according to draft DIN EN 1264-5.

• Basic material and protection layer are made of PE-RT DOWLEX 2344.
• innovative synthetic, that does not require cross-linking; excellent features at high pressures and temperatures; extremely aging resistant.
• highly flexible and easy to handle.

• high-barrier material poly-ethyl-vinyl-alcohol (EVOH).
• firmly affiliated to one unit with the pipe material PE-RT.
• avoiding oxygen diffusion until + 80 °C (requirement of DIN 4726 only until + 40 °C)
• oxygen permeability of approximately 0,1 mg / m²d) (many times better than required by DIN 4726)

• protection of the oxygen barrier from mechanical damage, humidity and other environmental influences.
• protection of the oxygen barrier from aging.
• Increase of the resistence to internal pressure – with the effidur heating pipe the oxygen barrier improves the pipe stability (EVOH has excellent mechanical strength properties).
• Shrinkage is avoided; effidur pipes hardly show shrinkage (< 1,5 %; shrinkage known from PE-X does not occur).
• ideal for press fittings: protection of the oxygen barrier from ripping.

Flexible fully synthetic 5-layer compound pipe made of PE-RT 80 (Dowlex 2344) according to DIN 16833 and application standard DIN 4726. Oxygen impermeable according to DIN 4726 oxygen barrier protected between two PE-layers.

The pipe is approved as PEOC-SYSTEM with the corresponding fittings through DIN CERTCO, approval mark 3V217 PE-RT. The effidur heating pipe meets the requirements of ISO 10508: category 4 (underfloor heating, 6 bar).

NO WORRIES!

The service life of a heating facility is essentially determined by the service life of the used metallic and non-metallic materials. The service life of metals is significantly distinguished by generating and preserving a thin protection layer of metal oxides. This surface layer inhibits corrosion so that a service life according to VDI 2067 is achieved. Nevertheless, chemical and physical processes can damage the protection layer.

For a long time the diffusion of oxygen through the pipes used in an underfloor heating was deemed negligible in comparison to other input possibilities. Experience shows that this factor shouldn’t be underestimated. The diffusing oxygen enhances the corrosion of the used metal parts that could lead to unintentional deposits within the heating system. This way the efficiency and functionality of the facility is lowered.

Therefore, the use of oxygen impermeable pipe, in the case of synthetic pipe with a reliably protected oxygen barrier, is indispensible in closed, technically gas proof heating systems. This also requires the regulation VDI 2035 sheet 2.

Effidur heating pipes have an organic oxygen barrier (EVOH) that limits the oxygen diffusion to approximately 0,1 mg / (m²d) and so undercuts the requirements of DIN 4726 (0,32 mg / (m²d)) many times.

The oxygen barrier is reliably protected from damage and humidity by the internal structure of the 5-layer compound pipe. Therefore externally sealing fittings can be used without problems.

When integrating an effidur floor heating or cooling system into an existing heating facility we recommend a hydraulic decoupling or the use of suited conditioning systems for the heating water (protection from lime and corrosion according to VDI 2035). The use of a flow filter additionally protects the heating system.

Pressure loss determination for an underfloor heating in order to calculate the required pump performance when connecting to an existing heating system. Since all heating loops are installed parallel and have the same length, the pressure loss for one loop per sub-manifold needs to be determined.

The heating pipes can be connected through effidur single plug connectors, 2-port or 4-port sub-manifolds or with effidur multi-port manifold units. These manifolds can individually be equipped with control elements. You find a wide range of manifolds and pre-assembled control units at the chapter COMPONENTS/SUB-DISTRIBUTION resp. COMPONENTS/CONTROL UNIT. All manifolds of the effidur floor system have push connections with the John Guest principle. The manifolds might be installed in a wall recess or behind a dry wall in a distribution box. Pay attention to keep a minimum height of 200 mm between the distribution box and the floor.

When connecting the underfloor heating to an existing heating system we recommend the use of a flow filter or sludge collector for the entire heating system or for the underfloor heating only. Depending on the project it might be more favorable to install the filter or sludge collector directly at the flow (example 2) instead of shown in our example 1. This way contaminations of the existing facility from the installation, dirt or similar can’t get into the loops of the underfloor heating. Pay attention to the manufacturer’s instructions.

For existing heating facilities it might be useful for hydraulic reasons to separate the underfloor heating from the existing radiator heating. The underfloor heating needs then to be hydraulically separated from the rest of the facility through a heat exchanger. This way the underfloor heating can ideally be run with a separate pump. Pay attention to the manufacturer’s instructions.