Snow Melting
5) Calculating the Circuit Information
Tubing
(1/2" 5/8" 3/4")
6" Spacing
9" Spacing
12" Spacing
Fasteners*
6" Spacing
9" Spacing
12" Spacing
Divide
Snow Melt
Area (ft²)
Multiplier
Estimated
Amount
2.2
1.5
1.1
Snow Melt
Area (ft²)
Multiplier
Estimated
Amount
1.1
.75
.55
total tubing by max. circuit length (round up)
Snow Melting 6) Water/ Glycol Design
• Selecting the percentage of glycol
Freezing Point (°F)
Glycol Mixture
Ethylene
Glycol
Propylene
Glycol
30%
3.7
8.4
40%
-12.6
-6.7
50%
-35.0
-30.0
Snow Melting 7) Flow Rates (gpm)
gpm =
Btus
DT x 500
short form
for snow
melting
Btus
15,000
DT @ 30 F°



Calculate flow for each snow melting area
Divide by number of circuits in area to get gpm per circuit
Use flow per circuit to find pressure drop
Snow Melting 8) Pressure Drop
2 gpm through 5/8" PEX =
0.055 feet of head loss per
foot of tubing
Circuit length = 250’
Pressure drop = length x
loss per foot
2.0
250 x 0.055 =
13.75 ft. head
0.055
Snow Melting
9) Pressure Drop and Flow Rate Adjustments
•
Use the table to
adjust the
pressure drop
and flow rates
according to %
Glycol mixture
Glycol Effects on the System
% Glycol Mixture
Flow Rate
% Increase Multiplier
Pressure Drop
% Increase Multiplier
30%
5% (1.05)
20% (1.20)
40%
8.5% (1.085)
25% (1.25)
50%
12.5% (1.125)
31% (1.31)
Snow Melting10) Pump Sizing
•
•
•
•
Add gpm of all areas together
Take highest head loss in tubing
Add any additional head loss (other piping, valves, etc.)
Choose pump from manufacturer curves
Snow Melting Cross Sections
Slab on grade with insulation
Snow Melting Cross Sections
Pavers over sand or stone dust bed with
insulation
Snow Melting Cross Sections
Asphalt over sand or stone dust bed with
insulation
Snow Melting Cross Sections
Slab over structural slab
Snow Melting Construction
•
Utilize expansion joints as with a radiant slab (100 foot
perimeters, 25’ x 25’ max)
•
Use bend supports and sleeves to protect tubing at all
penetration points and expansion joints
•
Insulate under snow melt area
•
Insulate sides of slab (very high heat loss)
Snow Melting Tubing Layout: standard
DETAIL DRAWING A
DETAIL DRAWING B
DETAIL DRAWING C
DETAIL DRAWING D
DRAWING
DETAIL DRAWING E
DETAIL DRAWING F
TYP. PIPING SCHEMATIC
HEADER SCHEDULES
HEADER NO.:
CIRCUIT NO:
HM 1
F LOW RATE:
CIRC. LE NGTH (FT):
8 .2 gpm
PR. DROP: 7 .2 ft.hd.
TUB E SP ACING (IN):
COIL SCHEDULE
HEADER LEGEND
TUB E O.D (MM)
Snow Melting Tubing Layout: stairs
Snow Melting Selecting the Control Package
•
Basic Digital Snow Melting Control II package
– Economical system required
– Snow sensor cannot be mounted in the thermal mass
Snow Melting Basic Control Piping
Snow Melting Selecting the Control Package
•
Advanced snow melting control
package
– Slab protection
– Boiler protection
– Manual override
– WWSD (Warm Weather Shut
Down)
– CWCO (Cold Weather Cut Out)
– Test sequence
– Pump exercising
Snow Melting Advanced Control Piping Option 1
Snow Melting Advanced Control Piping Option 2
Snow Melting Advanced Control Piping Option 3
Climate Mat Header
Climate Mat Header after
finish pour
• Assembled header
• Pressurized
• 20’ leaders
Climate Mat being rolled out.
Kyle Busch Racing – Garage - Radiant
KYLE BUSCH GARAGE – HILLS SERVICE CO.
 Project location – Mooresville, North Carolina
 Contractor – Hills Service Company
 Viega employees assisted in the installation of the Viega Climate
Mat Radiant system for this 60,000 square foot race shop.
 The Viega Climate Mat was selected due to the functionality and
ease of installation in comparison to other radiant systems in the
market.
 This project will achieve a greater “GREEN” number or “LEAD
POINTS” due to the use of Geothermal and having it tied into the
Viega Radiant System.
Kyle Busch Racing – Garage - Radiant
Main garage area prior to install.
Main garage after Climate Mate install.
Jay & Kevin work diligently to find the
Climate Mates to place in the garage
and wash bay areas.
Example of the proper spacing and
install of Climate Mat.
Garry is busy hammering down the
Climate Mate.
Example of one of the connected
manifolds for the Kyle Busch garage.