ForceRed Series
®
Infrared Heat To The 4th Power ™
Setting A New Standard For
Extra High Efficient, Infrared Tube Heaters
30% More Efficient Than Typical Models
Solutions For Commercial & Industrial Heating, Since 1949
NEXT GENERATION INFRARED TECHNOLOGY
Pull Through Tube Heater
Negative Pressure
Technology
®
Infrared Heat To The 4th Power
What Is ForceRed ®?
The ForceRed Series is Space-Ray’s next generation infrared tube heater
designed to provide the maximum Radiant Output at a fixed emitter tube
length, and can provide up to 30% more fuel savings than typical models.
This new series of tube heaters is especially engineered to take the efficiency of infrared tube heaters to the next level of fuel savings.
Space-Ray’s new ForceRed Series was designed by a team of engineers
using both computational heat transfer modeling and the advanced European Radiant Output measurement system. The next generation infrared
tube heater is here now. ForceRed Series is the future of extra high radiant
efficiency infrared tube heaters.
Why Is ForceRed The Next Generation Infrared Tube Heater?
The ForceRed Series pushes radiant energy delivery to the next level by
offering 30% more Radiant Output and 30% more fuel efficiency compared
to other typical tube heaters. ForceRed delivers more radiant energy to the
floor level thus helping maintain thermal mass in the floor which offers a
quicker recovery when the doors are opened and closed frequently.
For background, infrared tube heaters generate Radiant Output as well as
convective output and flue losses. The Radiant Output is the key to producing fuel savings. It is the usable heat that is transferred directly to the
floor level. Convective output rises first to the ceiling and will eventually
stratify down to the floor level, but there will be wasted heat trapped at the
building’s ceiling which is not useful or fuel efficient.
The remaining energy (i.e. products of combustion) is discharged outside
the building normally through the vent and is sometimes referred to as the
flue loss.
Infrared Comparison
Below is a depiction of how Space-Ray’s new ForceRed Series maximizes Radiant
Output while reducing the amount of heat energy lost to both convection and flue
losses.
Infrared Heat To The 4th Power ™
During the design process Space-Ray engineers considered each element of the theory
of radiant heat transfer and tested them to find
the best solution to optimize the radiated energy output for a series of fixed length (or surface area) heaters using the following formula:
Temperature (Ts4 – Tr4): Radiant Heat transfer is significantly influenced by temperature.
The multiplier is the absolute temperature of
the heat source (Ts) to the power of 4 minus
the absolute temperature of the receiver (Tr) to
the power of 4. In the case of radiant tube
heaters this means maximizing the temperature of the surface area of the emitter tubes.
Emissivity (ε): The emissivity of a black body
is 1.0 all other surfaces are less than this. In
the case of radiant tube heaters this means
selecting the most emissive material for the
operating temperature of the emitter tubes.
Geometric View Factor (F): This is the factor
for how well the receiver can “see” the energy
being transmitted from the emitter. In the case
of radiant tube heaters this means maximizing
the amount of energy directed in the infrared
wavelength from the heat source to the receiver.
Area (A): Surface area of the emitter tubes.
This means determining the best heat input to
provide the highest temperature for the length
and diameter of emitter tube selected.
* Holman, J.P., Heat Transfer,
McGraw-Hill Series in Mechanical
Engineering, 2010, P13
ForceRed Series is covered by one or
more U.S. patent applications.
2
ForceRed maximizes the Radiant Output and minimizes both the convective output and flue loss
to ensure more of the energy is received at the floor level as Radiant Output.
Technology
®
Infrared Heat To The 4th Power
A New Measurement:
Setting The Standard With The Infrared Factor (IF)
A new term called the Infrared Factor (IF) is part of a draft standard AHRI
1330P titled "Performance Rating Standard for Radiant Output of Gas Fired
Infrared Heaters". The Infrared factor is a linear scale of values from 7 to
15, where the factor is calculated from the measured Radiant Output of the
heater versus the gross energy input in the fuel.
The basis for the scale is that the minimum value of 7 represents the equivalent of the minimum permissible Radiant Output required in the ANSI
Standard Z83.20 that is needed to be classed as a radiant heater. Infrared
Factor values of 9 and 10 represent the average, typical heater values available on the market today.
How Do You Measure Radiant Output?
Until recent years there was no repeatable test methodology to determine
the Radiant Output of tube heaters. Two previous major efforts by tube
heater manufacturers and nationally recognized testing laboratories resulted in a test methodology with mixed results.
A new, reliable method has recently been developed in Europe which is
documented in the European Standard EN416-2. In this standard, the Radiant Output is measured from a distance of 4” (100mm) below the heater to
minimize transmission losses. Measurements are taken with a water
cooled thermopile in a grid with points of 4” x 4” (100mm x 100mm) across
the width of the heater as well as along the entire length of the heater.
The measurements are recorded using a computer data acquisition system.
The data points are then integrated to give measurements per square
decimeter and a calibration constant is applied to the measured mV values
to convert to w/dm2.
Great Got Even Better
In many applications typical infrared tube
heaters have saved building owners up to 50%
on their heating bills when compared to forced
air systems.
These typical models normally have an IR Factor
of 9 or 10.
ForceRed’s Infrared Factor Is Up To 14
When using the new draft standard AHRI
1330P titled “Performance Rating Standard for
Radiant Output of Gas Fired Infrared Heaters”,
Space-Ray’s new ForceRed Series sets the
standard with Infrared Factors as high as 14,
which is 30% greater and thus even more efficient than typical models.
How good Is The New ForceRed Series?
In fact, a review of other countries that currently
have a Radiant Output performance rating
shows the United Kingdom has been at the
forefront.
In the UK their policy is to offer carbon reduction
tax credits to infrared products that will meet an
IR Factor of at least 12 from the AHRI 1330P
scale.
The new Space-Ray ForceRed Series with an
IR Factor of up to 14 sets the new fuel efficiency
standard.
ForceRed® Infrared Output Compared To Typical Infrared Models
3
Technology
®
Infrared Heat To The 4th Power
Thanks to the precision of this measurement system, Space-Ray engineers
were able to use the results of experimentation with both heater design
and heat input to maximize the heat output and get the highest Radiant
Output for each model length.
Radiant Output Comparison Between ForceRed® And Typical IR Heater
Typical U-Tube IR Heater 200-50
LENGTH ON GRID (m)
LENGTH ON GRID (m)
RADIANT OUTPUT (W/dm2
ForceRed® NXU175-50
175,000 BTU/Hr 50 FT U-TUBE EMITTER LENGTH
200,000 BTU/Hr 50 FT U-TUBE EMITTER LENGTH
Shown above is the Radiant Output measured in watts per dm2 output along the length of the new ForceRed NXU175-50 tube heater compared to a
typical model U-tube heater rated at 200,000 Btu/Hr. at the same length. Based on Radiant Output, the new ForceRed Series heater generates as
much as 30% more Radiant Output when compared to typical models.
ForceRed® ”U” Tube Provides More Evenly Distributed Heat Than Typical ”U” Tube Models
Typical U-Tube IR Heater 200-50
LENGTH ON GRID (m)
LENGTH ON GRID (m)
RADIANT OUTPUT (W/dm2
ForceRed® NXU175-50
175,000 BTU/Hr 50 FT U-TUBE EMITTER LENGTH
4
200,000 BTU/Hr 50 FT U-TUBE EMITTER LENGTH
The above charts shows the temperature via a red line under firing tube, while the yellow line depicts the return tube (exhaust leg).
The principle differences are that both the red and yellow lines show significantly higher Radiant Output at the U Bend end of the heater which provides
a more even distribution of fuel saving radiant heat.
Technology
®
Infrared Heat To The 4th Power
What Does A High Radiant Output
Infrared Tube Heater Mean To The Building Owner?
The ASHRAE HVAC Systems & Equipment Handbook, Chapter 15 states
that the ASHRAE building heat loss can be reduced 15-20% when using
an Infrared heating system. Space-Ray utilizes the ASHRAE prescribed
method along with the heater installation height above the floor level to determine the Infrared Heat Loss Reduction Factor (IHLRF) to use when sizing an infrared heating system.
As an example an Infrared Heat Loss Reduction Factor (IHLRF) of 0.80
can be used when a Space-Ray infrared heater with infrared factor of 10 is
installed at 16’ above the finished floor. Based on the higher Radiant Output
of the ForceRed Series heater, HVAC Design Engineers are now able to
size a new ForceRed infrared heating system using an Infrared Heat Loss
Reduction Factor (IHLRF) significantly lower than 0.80 based on the improved Radiant Output.
This lower Infrared Heat Loss Reduction Factor (IHLRF) can mean lower
Btu/Hr inputs into a given building which can result in fuel savings of up to
30%. Additionally, this could also translate into more benchmark points for
LEED certified green building design.
What Is Different About ForceRed?
ForceRed is designed to maximize Radiant Output for a given emitter tube
length (15’, 20’, 30’, 40’ etc…) at maximum emitter tube temperatures.
ForceRed® Is Also Green
Typical infrared heaters currently fall within the
definition of being “Green” based primarily on
being a proven energy efficient space heating
method to reduce fuel consumption in today’s
modern buildings.
Space-Ray’s new ForceRed series provides
an unsurpassed Radiant Output level which
only underscores the building owner’s projected reduction in energy consumption and
fuel bills.
Combined with this reduced energy consumption comes reduced CO2 emissions which only
reinforces ForceRed’s carbon reducing ability
and “Green” footprint.
ForceRed is designed for maximize Radiant Output with the use of a
unique dual reflector system − individual Asymmetric Reflectors & Outer
Shield Reflector.
ForceRed is designed for Maximum Thermal Efficiency through the extensive use of special turbulators at the firing leg as well as exhaust leg.
ForceRed is designed to only be installed horizontally to maximize Radiant
Output radiant energy transfer to the floor level (as whenever tube heaters
are angle mounted, they increase their convective losses which reduces
the tube temperatures, and in turn reduces Radiant Output as much as 30%).
ForceRed is designed to produce lower levels of CO2 based on the lower
firing rates needed to heat equivalent sized buildings with a lower Btu/Hr
input.
Why Does ForceRed Use
Aluminum Reflectors With A Dual Reflector Design?
Aluminum reflectors are widely used by infrared heater manufacturers due
to their high reflectivity rating of 0.97*. We asked our Engineers to start with
a clean slate and consider other materials when designing the ForceRed
Series. They reviewed polished Stainless Steel (430 2BA) material which
has a lower reflectivity rating of 0.85*.
Results showed that when subjected 3 days of operation, the stainless steel
reflectors discolored and the Radiant Output declined by 3.1%. They also
explored the use of Aluminized Steel (aluminum silicate hot bonded steel)
reflectors with a reflectivity of 0.80 ** and on initial operation they found that
the Radiant Output was 6.3% lower than Aluminum reflectors. This solidified
our decision to incorporate only aluminum reflectors on the new ForceRed
series.
Given the decision to utilize aluminum reflectors due to their high reflectivity
*Sopp and Brandt, Reflectivity and Emissivity of Bare
and Coated Aluminum, Finishes Division of Alcoa
Research Laboratories, 1975, P10
**Atlas Steel Products, Aluminized Steel Type 1,
ASTM463-A. (www.atlassteel.com website article)
5
Specifications
®
Infrared Heat To The 4th Power
rating of 0.97, our Engineering determined via Radiant Output tests that an
air gap between the dual aluminum reflectors was superior to less reflective
materials (e.g. stainless steel or aluminized steel) with a rigid or rolled insulation material sandwiched between the two reflectors.
The result was a new, unique dual reflector design utilizing the insulating
properties of an air gap in between two highly efficient aluminum reflectors
which results in a substantial gain in overall Radiant Output.
Key Features For Space-Ray’s
New ForceRed High Efficiency Tube Heaters
Pull-Through System
HForceRed is a pull-through system − the products of combustion are pulled
through the combustion chamber for increased radiant efficiency and greater
safety.
HForceRed incorporates multiple special turbulators on both the firing leg
as well exhaust leg of to provide uniform energy distribution.
HForceRed can be vented vertically, horizontally or by means of a common
vent.
H ForceRed is CSA certified for 25 ft. horizontal sidewall venting.
H ForceRed offers an optional Condensate Control System.
H ForceRed’s draft inducer is equipped with permanently lubricated, totally
enclosed, fan cooled, heavy duty ball bearing motor for maintenance free
operation.
H ForceRed’s draft inducer assembly can be used for through-the-roof
venting or rotated 45 degrees or even 90 degrees for horizontal venting.
H ForceRed is CSA certified for both vented or indirect vented operation.
Aircraft Hangars
Burner & Control System
H ForceRed uses a one piece cast iron burner with stainless steel flame
retainer.
HForceRed has a 10 year limited warranty on burner.
HForceRed can use both inside or optional outside air for combustion.
HForceRed is CSA certified for 25 ft. of outside combustion air inlet duct.
HForceRed incorporates a burner inspection sight glass.
HForceRed uses a slow opening combination gas valve for quiet ignition.
HForceRed incorporates an Air Proving Switch for proof of venting before
gas flow and ignition.
HForceRed has Direct Spark ignition with 100% Gas Safety Shut-Off (30
second pre-purge).
H ForceRed includes a 36" stainless steel flexible gas connector with each
control box.
H ForceRed features 3 Monitoring Lights for on-line diagnosis: power on,
insufficient air flow, and ignition system operation for ease of maintenance
and troubleshooting.
6
Warehouses
Specifications
®
Infrared Heat To The 4th Power
Radiant Emitter Tube System
HForceRed features all calorized steel tubes for improved emissivity long
life and high radiant efficiency. The calorization process produces an
emitter tube which is highly radiant absorptive on the interior and highly
radiant emissive on the exterior − will not flake or peel, and is corrosion
resistant.
HForceRed includes special high temperature titanium alloy
AlumiTherm emitter tubes.
HForceRed features a 5 year limited warranty on all emitter tubes.
Reflector System
HForceRed’s dual aluminum reflector system maximizes downward
radiation and minimizes convective losses.
HForceRed features highly efficient aluminum reflectors with a
reflectivity rating of 97%.
HForceRed uses specially designed individual asymmetric reflectors
to maximize emitter tube temperatures and Radiant Output.
ForceRed features specially designed
and “patent pending” tube support brackets that use
stainless steel rollers to facilitate tube expansion
and contraction.
HForceRed’s reflector ends are enclosed for maximum radiant heat
output and minimum convective losses.
30% To 50% In Annual Fuel Cost Savings
A highly radiant efficient Space-Ray infrared heating
system can normally save a building owner 30% to 50% in
annual fuel costs compared to forced air heating systems.
In addition, the new ForceRed Series offers up to 30% more
fuel savings than typical infrared heating systems.
7
Models & Dimensions
®
Infrared Heat To The 4th Power
NXU Series
Next generation heaters offer 30% increased radiant efficiency and 30% more fuel efficiency when
compared to typical tube/reflector design IR heaters.
Designed for maximum Radiant Output for each given emitter tube
length / heater Input. Any incremental tube length can reduce the Radiant Output.
Designed for maximum thermal efficiency − extensive use of turbulators.
Specifically designed for horizontal mounting to maximize the Radiant Output at floor level.
Ideal for spot or area heating as well as complete building applications.
MODELS
SINGLE STAGE
BTU/HR INPUT
MODEL*
RADIANT EFFICIENCY
TWO STAGE
BTU/HR
HIGH INPUT
BTU/HR LOW INPUT
GROSS RADIANT
EFFICIENCY - USA
NET RADIANT
EFFICIENCY - EU*
IR FACTOR **
NXU 85
85,000
85,000
50,000
62.0
68.9
13
NXU 110
110,000
110,000
71,500
69.5
77.2
14
NXU 145
145,000
145,000
88,500
69.4
77.1
14
NXU 175
175,000
175,000
114,000
67.5
75.0
14
NXU 200
200,000
200,000
125,000
65.5
72.8
14
*Tested in accordance with EN416-2 **IR Factor information provided for single stage heaters only.
DIMENSIONS
INPUT BTU/HR
TOTAL TUBE LENGTH (FT)
OVERALL DIMENSION
"L" (FT)
REFLECTOR WIDTH
"W" (IN)
REFLECTOR HEIGHT
"H" (IN)
85,000
20'
13' 3"
28"
8
NXU 110-30
110,000
30'
18' 0"
28"
8
NXU 145-40
145,000
40'
23' 1"
28"
8
NXU 175-50
175,000
50'
28' 1"
28"
8
NXU 200-60
200,000
60'
33' 1"
28"
8
MODEL
NXU 85-20
BOTTOM & END VIEWS
CONTROL BOX / DRAFT INDUCER
DUAL REFLECTOR DESIGN
END VIEW
BOTTOM VIEW
Asymmetric
Inner Reflector
END VIEW
8
Outer
Reflector
Models & Dimensions
®
Infrared Heat To The 4th Power
NXS Series
Ideal for complete building applications.
Designed for maximum Radiant Output for each given emitter tube
length / heater Input.
Designed for maximum thermal efficiency − extensive use of turbulators.
Straight tubes are always hotter at the burner end than at the exhaust end.
The NXS Series is not recommended for spot or area applications.
MODELS
SINGLE STAGE
BTU/HR INPUT
MODEL*
NXS 50
50,000
RADIANT EFFICIENCY
TWO STAGE
BTU/HR
HIGH INPUT
BTU/HR LOW INPUT
GROSS RADIANT
EFFICIENCY - USA
NET RADIANT
EFFICIENCY - EU *
IR FACTOR **
50,000
32,500
50.6
56.2
11
NXS 85
85,000
85,000
50,000
64.4
71.6
13
NXS 110
110,000
110,000
71,500
60.4
67.1
13
NXS 145
145,000
145,000
88,500
65.0
72.2
13
NXS 175
175,000
175,000
114,000
62.4
69.3
13
NXS 200
200,000
200,000
125,000
61.3
67.1
13
*Tested in accordance with EN416-2 **IR Factor information provided for single stage heaters only.
DIMENSIONS
MODEL
INPUT BTU/HR
TOTAL TUBE LENGTH (FT)*
OVERALL DIMENSION
"L" (FT)
REFLECTOR WIDTH
"W" (IN)
REFLECTOR HEIGHT
"H" (IN)
NXS50-15
50,000
15'
17' 3"
13"
7"
NXS85-20
85,000
20'
22' 3"
13"
7"
NXS110-30
110,000
30'
33' 3"
13"
7"
NXS145-40
145,000
40'
42' 3"
13"
7"
NXS175-50
175,000
50'
52' 3"
13"
7"
NXS200-60
200,000
60'
63' 3"
13"
7"
*Additional 10' emitter tube lengths can increase the Radiant Output by only 1% or less (essentially acting as a flue pipe) with minimal benefits.
BOTTOM & END VIEWS
CONTROL BOX
DRAFT INDUCER
8½
"
L
9"
18"
CONTROL
BOX
DRAFT
INDUCER
6"
END VIEW
18"
13"
BURNER
SIGHT
GLASS
1/2" MPT GAS
PIPE
CONNECTION
OPENING FOR
ELECTRICAL CONNECTION
COMBUSTION
AIR INTAKE
CLEARANCE TO
COMBUSTIBLES
LABEL
ACCESS PANEL
JUNCTION
BOX
FLUE
RESTRICTOR
PLATE
LIGHTING & SHUTDOWN
INSTRUCTIONS
9
Control Options, Mounting Heights & Clearances
®
Infrared Heat To The 4th Power
CONTROL SUFFIX*
TYPE OF GAS
DESCRIPTION
N5 / L5
NATURAL / PROPANE
SINGLE STAGE GAS VALVE - SINGLE STAGE INPUT
N7 / L7
NATURAL / PROPANE
TWO STAGE GAS VALVE - MODULATING INPUT - HIGH/LOW FIRE
* Indicate model number based on Btu/hr input (e.g. 110,000 Btu/hr), emitter length (e.g. 30 ft.). Control suffix (e.g. Natural Gas single stage input ). The unit selection for a U-tube configuration would be
NXU110-30-N5 and NXS110-30-N5 for the straight tube configuration
GAS
TYPE
BURNER
PRESSURE
SUPPLY PRESSURE
MIN
MAX
NATURAL
3.5” W.C.
5” W.C.*
14” W.C.
PROPANE
10” W.C.
11” W.C. **
14” W.C.
GAS
CONNECTION
VOLTAGE
AMPS
IGNITION
TYPE
FLUE
CONNECTION
OUTSIDE COMBUSTION
AIR CONNECTION
1/2" MPT
120 VAC
60 HZ
2.6
DIRECT
SPARK
4" ROUND
4" ROUND
* 7” W.C. for NXU/NXS (145-200) **12” W.C. for NXU/NXS 200
NOTE: For all installations higher than 2000 ft. above sea level, please consult the factory regarding recommended derating of heaters.
MODEL
MINIMUM
MOUNTING HEIGHTS
NXS 50
12'
NXU / NXS 85
13'
NXU / NXS 110
15'
NXU / NXS 145
18'
NXU / NXS 175
19'
NXU / NXS 200
21'
This chart is intended as a guide only, as heaters may be mounted at various heights. Mount heaters as high as
possible. Minimums are shown as a guideline for human comfort and uniform energy distribution for complete
building applications. Please consult your local Space-Ray Representative for a detailed analysis of your particular
infrared heating requirements.
Minimum Recommended Mounting Heights
Minimum Clearances To Combustibles
MINIMUM CLEARANCES TO COMBUSTIBLES
END
END
SIDE
CEILING *
BELOW
END
NXS 50
32"
6"
56"
16"
NXU/NXS 85
34"
6"
87
16"
NXU/NXS 110
44"
6"
110"
20"
NXU/NXS 145
46"
6"
114"
20"
NXU/NXS 175
52"
6"
116"
20"
NXU/NXS 200
52"
6"
116"
20"
MODEL NO.
CEILING
SIDE
BELOW
SIDE
HORIZONTAL
*When used indirect vented, clearances to ceiling from top of exhaust hood must be 12” on NXU/NXS 85
and 18” on NXU/NXS110-200. Note: Consult factory if reduced clearances are required.
Combustion Air And Ventilation
Combustion air and venting requirements for all gas-fired heating equipment must be provided per the National Fuel Gas Code NFPA54 or the authority having jurisdiction
over the installation. In contaminated atmospheres or high humidity areas, optional outside air for combustion can be supplied. Heaters can be common vented, vented, or indirect vented. Refer to the Installation and Operation Instructions for further information. A vented installation must be vented to the outside of the building with a flue pipe. An
Indirect vented installation requires a minimum ventilation flow of 4 CFM per 1000 Btu/hr of total installed heater capacity on natural gas by either gravity or power ventilation
(4.18 CFM per 1000 Btu/hr for propane). For indirect vented applications, building exhaust openings must be located above the level of the heaters and inlet air openings must
be located below the level of the heaters.
For Your Safety
OPERATE SPACE-RAY GAS INFRARED HEATERS WITH PROPER CARE AND OBSERVE ALL SAFETY PRECAUTIONS. Installation and service must be performed by a
licensed contractor. The installation must conform to Manufacturer's Installation and Operating Instructions or local codes. In the absence of local codes, the installation must
conform to the National Fuel Gas Code ANSI Z223.1 (latest edition, also known as NPFA54) or CAN / CSA-B149 installation codes (latest edition).
A Division of Gas-Fired Products, Inc.
Solutions For Commercial & Industrial Heating, Since 1949
P.O. Box 36485  Charlotte, NC 28236  Telephone (800)438-4936  (704) 372-6391  Fax (704) 332-5843
www.spaceray.com  email: [email protected]
© Copyright 2014, GFP INC.
1401 FORM# S45400