Danfoss Asphalt application. Ice & Snow Melting Application guide

Asphalt application. Ice & Snow Melting

Asphalt application. Ice & Snow Melting

Application manual

Intelligent solutions with lasting effect

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Index

1. Application Briefing	4
2. System Description	5
3. Products	7
4. System Design	9
5. Installation	12
6. Cases	16

Our quality management system and compliances

ISO 9001	TS 16949
ISO 14001	PED

Along with full compliance with EU directives and product approvals

Let DEVI do the work

DEVI - an abbreviation of Dansk El-Varme Industri – was established in Copenhagen, Denmark, in 1942. As from January 1st 2003 DEVI has become a part of the Danfoss Group - Denmark’s largest industrial Group. Danfoss is one of the world’s leading companies within heating, cooling and airconditioning. The Danfoss Group has more than 23.000 employees and serves customers in more than 100 countries.

DEVI is Europe’s leading brand of electrical cable heating systems and electric pipe heating systems with over 70 years of experience. The production of heating cables takes place in France and Poland while the head office is situated in Denmark.

The value of experience

We have installed literally thousands of systems across the globe, in every conceivable setting. This experience means that we can offer you practical advice about precisely which components you need to get the best results at the lowest cost.

Asphalt application. Ice & Snow Melting

This design guide presents DEVI’s recommendations for design and installation of ice and snow melting systems for asphalt application.

It provides guidance for heating cable positioning, electrical data and system configurations.

Following DEVI’s recommendations will ensure energy efficient, reliable and maintenance free solution for constant wattage heating cables with 20 year warranty.

1. Application

Briefing

Winter weather costs

In recent years there have been plenty of new stories about human and financial costs caused by increasingly harsh winter weather. Property damage, increased maintenance expenses, lost productivity, rising insurance premiums, personal injuries and even worse. Installation of DEVI Ice & Snow Melting System ensures a steady solution to address cold weather related problems.

Asphalt Ground solution – with a first class product range

The DEVIasphalt™ Snow Melting System is a system installed directly in asphalt ensuring instantaneous relief from snow build up and ice forming.

DEVIasphalt™ series introduces completely new standards for highperformance cables used for ice and snow melting in asphalt areas outside.

DEVI recommends the DEVIasphalt™ cables and mats for asphalt installations as they provide shortterm resistance to temperatures

of 240 °C. With this type of cables and mats the sand bed over the cable is not required. This reduces

Benefits

•Efficient snow removal

•Safe traffic and working areas for people

•Quick installation directly in asphalt, no need to cover cables with a sand bed or concrete

•Up to 20% Energy saving comparing to heating elements installation in a sand bed

•Cost saving for asphalt repair after winter

•Environment is protected against salting and antifreeze related damages.

•Automatic ”Around the Clock” snow clearing service.

•Smart 2-zone control with low energy consumption

•PVC free, twin conductors heating cables and mats (IEC 60800 and IEC 62395)

•A maintenance free system with 20 year full warranty on cables and heating

time and installation costs. To avoid cable damage heavy machinery (rollers or asphalt laying machines)

should not be used. Asphalt cover should be at least 5 cm thick from the top of the DEVIasphalt™ heating cables. An electrician should ensure of cable and insulation resistance measurements both before and after asphalt is applied.

By using DEVIasphalt™ heating cables and mats controlled by electronic thermostats with moisture sensors, you can cost-effectively protect large areas such as parking areas, ramps

or pedestrian accesses to buildings. Giving you convenience and safety while saving a lot of tiring and timeconsuming manual work.

One of the greatest advantages of this system is a prompt response and as a result, the most energy efficient solution for the ground ice & snow melting applications.

4 Application manual · Asphalt application. Ice & Snow Melting · VGLUC102 · ©DEVI

2. System Description

The most common DEVI ice and snow melting applications on ground are car parks, driveways, pavements, outdoor steps, loading platforms and bridges.

Main purpose of the application is to melt snow or slippery ice on asphalt surfaces.

Like for any other outdoor areas during winter, snow and ice needs to be removed from asphalt surfaces to secure safe access to buildings.

It can be done manually or in a smart way – by means of electrical ice & snow melting system with thermostat control and moisture and temperature sensors that can control 2 zones simultaneously. Inactive during cold but dry weather 2 zone control saves energy and reduces costs.

The automatic regulation of the snow melting system keeps areas free of snow and passable at all times – night and day.

Another great advantage of the system installed directly in asphalt is a prompt response or warm up time compared to other installations.

Two types of asphalt applications are used most frequently: Mastic asphalt and Road/concrete asphalt.

Important: if DEVIasphalt™ cable or mat is embedded in asphalt

•2 layers of asphalt must be always ensured

•DEVIasphalt™ cable must be installed in the first asphalt layer (max. 8 mm stone fraction)

•If road asphalt is used, first layer must be rolled by a hand drum

•First layer must be cooled down to max 80 °C before laying the second layer

•The second layer can be rolled with up to 500 kg

When installing ice and snow melting systems on steep slopes it may be necessary to provide some drainage for melted water at the slope bottom. The drain system should also be protected against ice formations.

The diagram below shows the warm-up time values for 2 different driveways constructions. The heating cable that is installed directly into asphalt (red line) can warm up the surface approx. 4 times quicker comparing to the cable that is installed in sand bed with pavement blocks (blue line).

Warm-up time for 2 applications, 300 W/m² in -3 °C air temperature

<![if ! IE]> <![endif]>temperature [°C]	0,5
	-1,5
	0
	-0,5
	-1
								Driveway with sand bed &
<![if ! IE]> <![endif]>Surface	-2,5							80 mm pavement blocks
								mastic asphalt
	-2							Car park with 60 mm
	-3
	0		1	2		3		4		5

Hours [hrs]

Fig. 1 - DEVIasphalt™ heating cable under the first layer of Road asphalt rolled by a hand drum.

Fig. 2 - The cables are protected by concrete prior to further asphalt arrangement.

Application manual · Asphalt application. Ice & Snow Melting · VGLUC102 · ©DEVI 5