RADIANT TUBE SEMINAR

Principles in Radiant Heating

Properties of radiant energy

• Emitted by hot surfaces• Travels in straight lines• Passes through the air without

heating it• Absorbed by cooler solid objects

on which it falls, heating them

Understanding Radiant Heating

• Heaters which utilize infrared energy can heat objects and people directly without having to directly heat the air.

• Warms the air near the objects and floor via convection.

• Is reradiated to occupants and other surfaces of the space.

• Minimizes stratification to ceiling, lowering roof losses.

• Eliminates exfiltration caused by moving air across exterior surfaces & out through openings

Air Temp 90°F

68°F75°F

Warm Air Heating

High Temperature Air = High Stratification & Increased Roof LossMoving Air Increases Surface Losses & ExfiltrationResulting In: Higher operating costs, Uneven heat distribution, Not easily zoned & Slow recovery - warm-up

60F

.

55 - 65°F

61°F

Radiant Heating

No or Minimal Stratification and Decreased Roof LossNo Moving Air Decreases Surface Losses & ExfiltrationResulting In: Lower Operating Costs, Comfortable Even Heat Distribution, Easily Zoned & Much Faster Recovery - Warm-Up

61°F

Why Radiant Tube Heating?

Drop Degree Day Base with Radiant, Typically 5 Degrees F for Added Savings over air transfer systems, with lower thermostat setting.

Easier “Zone” heating (ex. docks vs warehouse areas)

Lower Energy Cost Typical 25-65% Vs Warm Air Systems.

Depending On Competitive System, Significantly Lower Electrical Requirements

Over 45 Years of Proven Savings & Effectiveness in Many Applications

Why Radiant Tube Heating?

Greater Comfort “sandwiched” between a warm floor below and low intensity span above, when properly designed.

Increased Efficiency, heat “work zone level” not ceiling. Radiant does not increase heat transfer by “scrubbing” building envelope with moving air. With forced air heat stratification increases roof and exfiltration losses.

Faster Recovery in Applications with Active OHD’s, due to heat “reservoir” in the mass of the floor.

Test Have Shown Equal Comfort Is Maintained With RadiantTube Heaters, Over Warm Air Systems, At A 5 Deg F Lower Temperature Setting: Assuring Real Savings By Means Of ALower Degree Day Base.

Approx 65F With Warm Air Is Equal To 61F With Radiant Tubes For Comfort

Types of Radiant Heating

Low Intensity

“Passive”

Examples: In-Floor or Panels Above

High Intensity

“Spot” Of Heat

•Open Flame – Added Ventilation Required

Medium Intensity

“Span” of Heat

•Enclosed Flame & Vented

• Fast Heat Recovery When OHDs Open-Close and/or Cold Mass Enters Bldg• More Effective & Easier To Zone Heat• Much Lower Initial Cost – Easier Construction Coordination• Service Issues Easy To Address – No Potential Major Repair Cost• Warm Floor & warm Span of Heat Above Offers “Sandwiched” Comfort• Easy Approach For Retrofit Applications• Within Certain Parameters, A Design Error Is Easy To Correct With Minor Change Outs & Adjustments To Burners To Increase or Decrease BTUs• No Added “Boiler Room” Floor Space Required

Radiant Tube

Radiant In Floor

Evolution of Radiant Tube Heaters Original concept “little suns” many burners in series to common vent

Larger BTUs came along, with end burner to common vacuum pump

“Unitary” heaters in various BTU’s and lengths; “Push” or Vacuum Vented

As numerous mfgrs entered (and some left) many variations of the above.

Dual firing rate heaters introduced.

Modulating firing rates tube heaters.

Ambi-Rad’s Ultra high efficiency heaters (>75% Radiant Efficiency).

Ambi-Rad’s Vision of the Future Is Now

Full range of product selection includes:

• VPlus “Push Tube” unitary heaters,• VPlusHL - Hi-Low Series, both gas & air is modulated for true 2 stage• VS Series Vacuum Vented unitary heaters• VSHB Series Multi-Heaters – Common Vented• VSX Series, ultra efficient, low NOx, high radiant output, heat recuperation, double shielded• VSXHB, double shielded, no heat recuperation, multi heaters to common vacuum pump• ARC Series Burners, common vented – Std & Modulation systems, long lineal design, 90%+

A leader worldwide in radiant tube products and experience..

New advanced burner technology

Choice of burner ratings from 40,000 to 200,000 BTU’s

Lengths from 10ft to 80ft, Straight & “U” Configurations

All units are CSA certified and conform to the most stringent environmental requirements of building services design

New slim-line burner head provides a super- long evenly distributed flame that dramatically improves temperature distribution along the entire length of the heater, delivering more heat spread across the floor

New low turbulence burner head with:

• Improved heat distribution

• Lower noise

• Lower NOx

On All Vision Models –

VPlus, VS, VSHB, VSX

Improved combustion performance – improving environmental impact

Flame length

Standard radiant heater has Short, Intense Flame: 150,000 BTU

2ft

Up To 15ft + Vision heater: 150,000 BTU

Burner

Burner

Visions Staged Combustion: Center Flame is Primary Gas/Air Combustion & Around Outside Secondary Air Completes Combustion & Lowers NOx. Reduced Turbulence = Low Noise.

Much Longer Flame Length Offers Added, Effective Comfort – Plus

15 ft +

Vision heater: 150,000 BTU

Burner

Noise

• 47dB(A) - 15dB(A) lower than typical standard radiant tubes

NOx

• 55ppm – NOx levels 40% lower than standard tubes

Flue gas loss16%

Convective heat31%

Radiant output53%

Typical standard heater

Standard heater with insulated double skin reflectors:

Flue gas loss16%

Convective heat16%

Radiant output68%

OK – What’s The Rest

of the Story?

AmbiRad’s solution…

The new high efficiency Vision

VSXUS heat exchanger

The inclusion of a recuperative heat exchanger and double skin reflector on VSXUS models (patent pending on both burner and heat exchanger), increases thermal efficiencies to 88% and radiant efficiency up to 65%

Fresh air

Products of combustion

Firing tube

Products of combustion to flueRecuperated Air Approx 250+F

Radiant output78% vs Std 53%

Recuperative heat exchanger

Flue gas loss10% vs Std 19%

Convective heat12% vs Std 31%

VSX Advantages Double Reflector Canopy Long Throw Burner Flame Heat Recouperation Dual Turbulators Extra Deep Reflectors Dual Tubes Under Canopy

VSX SERIES

• This means fuel savings as great as % can be achieved when compared to two stage or 30% vs standard radiant tubes

Standard heater

Fu

el c

on

sum

ptio

n

Vision VSX heater

30% reduction

Modulating heater

Vision combustion efficiencies

4 ER44 150,000 BTU’s

5 ER44 100,000 BTU’s

Traditional

radiant heater

ER44

Modulating radiant heater

Vision

VSXUS

High fire4 Low fire5

Combustion Efficiency1 82 82 83 90

Radiant Efficiency2 53 53 52 78

VSXUS efficiency and coverage

• AmbiRad Vision VSXUS improves temperature distribution along the entire length of the heater

Vision HB SERIES

Multi Vision VS Series BurnersManifolded To A Common Vacuum

Pump (Vent Point).Less Roof/Wall Penetrations

More BTUs “Milked” Into Space, Prior To Venting To The Outside.

Vision Hi-Low SeriesTrue Two Stage

• Both air and gas is modulated• Ensures maximum thermal

and radiant efficiencies• Shares Vision Long Flame

Technology with Greater Heat Distribution Down the Tube, Quiet, Low NOx Operation

The Better Dual/Hi-Low Option• With the SmartCom Controller a given % of heaters in a facility can be

programmed to fire based on a “normal” heat recovery scenario that is set within the SmartComs logic.

• If that recovery rate is not “on target”, a second set of heaters are activated to help achieve that given recovery rate and/or extreme, prolonged low outside temperatures.

• Dual Rate or Hi-Lows typically only do about 33% differential in firing rates, with lower emissivity at the lower rate.

• “Phased” firing can offer 50% High-Low effectiveness, PLUS all burners operate at full input – assuring maximum emissivity!

• Example: Expo halls and hangars

Hangar Example

50 % High-Low, Ideal For Mega Hangar. Low Fire Most Of The Time, All Fire When Large Hangar Door(s) Open And/Or Extreme Cold Weather Occurs.

14 Systems – 6 – 130MBH Burners Per System = 84 Burners All Fire When Required (High).

Low Fire Only 42 Burners Fire.

Expo Hall ExampleHigh Low Performance of 45% While Maintaining High Emissivity

10 Heaters Designed To Operate On “Low” Fire, 8 Additional Operate When “High” Fire Required

Summary of Vision

Increased combustion efficiency up to 90%

Increased radiant efficiency up to 78%

Fuel savings as great as 30% plus when compared to Std RT heaters

Super-long evenly distributed flame for Added Comfort

Reduced noise levels of 50%

Up To 40% reduction in NOx levels

ARC Series SystemsStd & Modulation

Std: Fixed Firing Rates 40-157 MBH BurnersStd. Controls On-Off

Modulation Controls Vary Outputs Between 60% - 100%

Spec SmartCom ControlsFor Added Comfort & Savings

ARC Modulation

Simple-Effective Modulation:Minimal Added Wiring

Required with ARC Modulation“Price Effective Cost Add”

Modulation Installation Fast/Easy

Multi Zoning Possible per VP

ARC ModulationBenefits with ARC Modulation:

Reduce On-Off Cycles

Tighter Temp. Control

Improved Comfort

Lower Energy Cost

Simplification Means AddedReliability-Lower MtncLow Voltage Wiring Above – Line Voltage Below

”Bolt in Place” Welded Brackets for safe secure reflector & tubing installation.Lower cost suspension system, still offers “Lock-In-Place” installation.

For Added Reflector Robustness, add either AlumaSteel or Stainless Steel reflectors.

Sports/Ball Grills For Added Stiffness.Ideal in any application where a secure system is required, such as –• Any place students are.• High wind load areas.

Wet – High Humidity Environments? Ambi-Rad Offers Corrosion Resistant Components.

Options: Rugged, Durable, Safe Construction

SmartCom Controls Self Adapting Optimised Start Up

Exp. Anticipates Bldg Needs AM, Saves Run Time Self Adapting Optimised Shut Down

Exp. Anticipates Bldg Needs PM, Saves Run Time Black Bulb Sensor (Lower Right Photo)

Measures Radiant Temp, Via Surface Sensing Intuitive Controls Simplicity no training required 7 Day Programming- Holidays Three On/Off Periods Easy Set Overtime Password Protection Battery Back-Up

Radiant Tube Design Considerations Mounting Heights vs BTUs – Application Always Matters

Coverage/Placement – Area Heat vs Wall to Wall.

Reflectors: Std 45 Degs Center, With Side Approx 60

OHDs on 1 or 2 Sides or Big Hangar Door (wall)

Venting – Roof Wall, Individual vs Common

Gas/Electrical/Vents – Easiest Install vs Better Coverage

Too Long Vs BTUs? U Tube vs Straight Tube vs Series

Acceptable Heat Recovery Considerations

Budget, LEED & Non Mechanical Design Mandates

• Additional Design Consideration– When heating with standard efficiency radiant

heat, input load requirements are reduced by 15%. With the highest efficiency equipment this can reach as much as a 30% reduction in input.

Example: – BTU Load For Forced Air – 1,000,000 Btu/Hr– Forced Air (Front Range) 1,200,000 +/- – Std Performance Radiant Tubes .85 = 850,000*– High Performance Radiant Tubes .7 = 700,000*

* This has a positive effects not only energy savings, but front end cost of gas pipe sizing and related installation cost!

• Hanging Height– General rule of thumb is for every 1’ of hanging height the unit

“footprint” will equal 2’.– Low bay applications

» Require more equipment to spread heat evenly in the space.– High bay applications

» Fewer units at higher btu outputs are required.

Contrary to common perception, it is typically not required that all floor space in an area be “blanketed” by the radiant system to achieve acceptable

comfort levels.

Perimeter applicationsSystems in low heat loss per square foot requirements such as new construction factories and warehouses typically utilize systems surrounding the perimeter with lower concentrations of heat in the center of the building where only roof load exist.

EQUIPMENT SELECTION GUIDELINESCommonly Driven By A&E/Owner Directives

Such As:

Is Budget VPlus or VSX/ARC Project?

Comfort – Coverage Major or Side Consideration?

Performance Mandates – Need 90%+?

Appearance – Long Lineal vs Compact “U”s?

Penetrations Qty & Roof or Wall?

Zoning - Control Requirements?

Robustness (Wind Exposure-Wash Bay)?

Mounting Heights - High Radiant Output?

Heat Recovery Rates Called Out?

Brief Overview Of Our Other Primary Product Lines

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