Danfoss Vineyards Frost Protection Application guide
Electric Heating
Vineyards
Frost Protection
Application guide
Intelligent solutions
with lasting effect
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Index
Our quality management
system
and compliances
Along with full compliance with EU
directives and product approvals
ISO 9001 TS 16949
ISO 14001 PED
1. Application overview 4
2. System description 5
3. System design 6
3.1 Heat loss calculation 6
3.2 System output 6
3.3 Product selection 7
3.3.1 Heating cable selection 7
3.3.2 Thermostats/controllers 9
3.3.3 Accessories 11
3.4 Installation guide 12
4. Safety instruction 13
4.1 DO's 13
4.2 DON'Ts 13
Solve the challenge of vine
growers with an Electric
Heating system
Electric Heating by Danfoss is a symbiosis of long history formed by 2 brands
DEVI and Danfoss united under 1 company umbrella.
It derives from DEVI brand that 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 air
conditioning. The Danfoss Group has more than 23.000 employees and serves
customers in more than 100 countries. The development of electric heating
systems takes place in Denmark, where the head office is situated while
heating elements (cables and mats) are manufactured by Danfoss in EU.
5. Case stories 14
6. Technical support 14
Electric Heating is an energy efficient system
using electric heating cables to protect vines
against frost damage
This design guide presents our recommendations for design and installation
of Vineyards Frost Protection system. It provides guidance for a heating cable
layout, electric data and system configurations.
Following our recommendations will ensure energy efficient,
reliable and maintenance free solution for constant wattage
heating cables with 20 year warranty.
1. Application
overview
Every year vine growers from
different regions face a problem
of late frosts. They often happen
in April - May when buds start
blossoming.Late spring frosts are
one of the greatest challenges vine
growers are facing. Non-heated vines
can suffer considerable inflorescence
damages (up to 50%), whilst heated
vines will have dramatically
improved protection of harvest loss
or damage and reduce the losses to
approximately 13-20%.
Worldwide, the grape and wine
industry rely on three main
alternatives for frost protection: frost
fans, sprinklers, and candles.
Electric Heating solves the challenge
with energy efficient systems using
Electric Heating cables to protect
vines against frost damage.
Benefits
• An energy-efficient solution with electric
heating cables.
• Easy, fast and reliable installation.
• A customized approach to meet client’s needs,
area of vinery and number of rows.
• Proven high saving compared to the existing
methods.
• A sustainable solution for a green and clean
future through low energy consumption during
the frost period.
• Tough cable outer sheath (resistant to weather
and UV)
A green (without CO2 emissions)
and sustainable lifetime solution.
Highly economic due to low energy
consumption during the frosts
period.
• Protected against chemical
fertilizers;
• Extremely-high pulling strength
(special tractors coward the
vineyards, while knocking the
fruits);
• Accurate power design (W)
according to requested needs;
• 5 or 20 years warranty.
Heating system can provide frost
protection ONLY in spring season
when the bud grows and NOT in
wintertime!
4 Application guide · Vineyards Frost Protection · ©DEVI
2. System description
The concept involves
installation of heating cable
along the main trellising wire
of grapevines.
• Frosts protection in
spring time (from 2 up to
7 days)
• The ambient
temperature is -2…-8 °С
• Most susceptible to frost
vineyards are located in
the lowlands/valleys (low
area of land)
50%
100%
40%
30%
20%
10%
Electric Heating solves the challenge
with energy efficient systems using
Electric Heating cables to protect
A dormant bud is reasonably frost
hardy, it can survive frost down to
-3,5 °С (Pinot Noir).
vines against spring frost damage.
The heating cables by DEVI are installed and fixed on metal wire along
the grapes. The system is controlled
automatically by temperature sensors
As the bud grows the water contents
raise in the bud and it becomes more
susceptible to frost -1,1 °С can damage it (Pinot Noir).
connected to the controller.
We offer an energy-efficient solution
Non-heated vines can suffer considerable inflorescence (bud) losses.
with our electric heating cables for
frost protection of the vines.
Number of berries can decrease by 3
times or completely disappear!
Different grape varieties can withstand frosts different.
Depending on heating level, vintage losses may be decreased
. . .
46%
Common view of electric heating system for vineyards
Vintage losses, %
0%
Non heated
Slightly
heated
28%
heated
Averagely
16%
13%
heated
Efficiently
Well-heated
5Application guide · Vineyards Frost Protection · ©DEVI
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