MHI Airtorch® Design Graphs

The graphs below can be used for all MHI Airtorch® Models.

From 2 KW to 6 MW

Energy and Environment Improvement with an MHI Airtorch®.

The standard conditions flow rate (SCFM) vs. Temperature is shown below (per kW).   When the exit temperature required is greater than 925°C please choose the THN/DNA/SH or DPF models (the graphs may be used for all MHI Airtorch® models except for the very low KW such as LTA750-01 or 2 KW models).  In the graphs below please use the light blue ot black thin lines for continuous mode with typically encountered start-stop conditions. The thick blue line is experienced in instances where the units have been in service and retain heat before the next run. This also happens when the Airtorch® is in a recuperative mode.  For the graphs below, the inlet temperature is assumed as ~50C.  The Airtorch® is an energy-efficient device.  MHI can provide an Airtorch® unit for up to greater than 800°C in input temperature, Output up to 1200°C making the MHI DH add on an ideal component for all large ovens.

Why do hundreds of customers prefer MHI for their best energy-efficient air heating needs?  Now offering new and improved with an incredible warranty on heating elementsPlease Contact MHI.

When comparing Airtorch® against heat exchangers, please note that the MHI Airtorch® units often save considerable energy because of their low-pressure drop. This power loss could be substantial with heat exchangers.  For example, if a flow of 0.6 kg/s is driven with a 5 Bar (~90 psi) pressure, then almost ~200 kW of power could be wasted for just driving the flow when compared to the Airtorch® systems that offer an extremely low-pressure drop (~ 1 PSIG). Or 2000KW if the ultra-low pressure drop Airtorch® models are used for 0.1 psig.

Please contact MHI for details.

1kW Savings per year is $876 @10c  per kWh

10kW Savings per year is $8760 @10c  per kWh

100kW Savings per year is $87600 @10c  per kWh

Airtorch® Applications

Large Flow MVTA.  For 1000-1100°C. These are sealed process gas heaters (THN or DNA class) with a blower or inline capability. High KW – High Flow.

Large Flow GTA – For high-pressure vessel Airtorch use. Custom engineering. Please contact us directly for assistance.

Typical Conversion of Gas

LTA – Up to 900°C. LTA is a process heater for air that requires a compressed air input.

VTA – Up to 900°C. VTA is a process gas heater with a fan or blower with low flow sensor capability.

MTA925 and GTA – Up to 925°C/1100°C.  These are flow or inline sealed process gas heaters which can take compressed air or compressed gas input. New Models for MVTA-DPF-DNA Class.

DPF – Up to 1150°C-1250°C/~2200°F. DPF models can take fan or blower input as well as a compressed air/gas input.

N2 gas Weight Gas
pounds
(lb)
kilograms
(kg)
cubic feet
(scf)
cu meters
(Nm3)
1 pound 1.0 0.4536 12.83 0.36
1 kilogram 2.205 1.0 28.24 0.8
1 SCF gas 0.07245 0.03286 1.0 0.02832
1 Nm3 gas 2.757 1.2506 35.3 1.0
Scf (Standard cubic foot) gas measured at 1 atmosphere and 70°F.
Nm3 (Normal cubic meter) gas was measured at 1 atmosphere and 0°C.

Quick conversion mm H2O column difference to psi:

1 mm H2O column difference to psi = 0.00142 psi

50 mm H2O column difference to psi = 0.07112 psi

100 mm H2O column difference to psi = 0.14223 psi

Quick Conversion of bar to kPA

bar kPa
1 100
1.2 120
1.4 140
2.0 200

Parameters

Airtorch® Mode.  Heat from cold to hot quickly.

Airtorch® Recuperator Mode. SH models accept inlet up to 800°C.

Example-Air.  Use the blue-black line for steady state and cold start.

Use the purple line only in recuperator mode.

Conversions:

Actual: 1 m³= 35.31467 ft³

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Standard value (approximate Conversion)

1 Nm³/h is ~ 0.6 SCFM

Or

1 SCFM ~1.6 Nm³/hr.

_________________________________________

Power

1 MBH = 0.293 kW

The graphs below are for Air. Please contact MHI for N2, CO2, sCO2, CH4, Ar, He or other gases.
—————————————————————————————————–
1 cu.m=61023.8 cu.in
For cubic inch to cubic meter for an approximate result, divide the volume in cubic inches  by 61023.8
Air Flow Grapgh for Higher Temperatures

Air Flow Graph for Higher Temperatures


Temperature for Air Flow

Temperature for Air Flow

Psst: A very approximate way too calculate is SCFM = KW x 3193/∆T where ∆T is in °F.

Tips:

What are the best practices (oven use an example) for energy demand reduction and best uniformity with the Airtorch®?

Tips:  The graphs of temperature vs. SCFM/kW above are for air at the very lowest loss conditions. The position along with the SCFM/kW axis changes with the gas.  For nitrogen, it is almost the same.  Because of the range of inlet temperatures and power a range of steady-state temperatures becomes feasible with every Airtorch as long as used within the device limitations.  Please consult MHI on the correct system for your application.  MHI Airtorch® models also offer a low-pressure drop.  MHI Airtorch models are designed with high efficiencies in mind.  Please consult with MHI on the best solution for your industrial process gas or inline heating.  If the flow of 1~1.2 kg/s is driven with 10 Bar pressure as opposed to low pressure (Airtorch® type) then almost ~1 MW of power may be wasted for just driving the flow!  So please compare this power loss for pressure flow when comparing manufacturers.

Augmentation Ideation

Process Air Heaters

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Airtorch Infographic

New and improved with incredible warranty on heating elements

The following table is for converting between different pressure units.

1 psi = 0.068947 bar = 68.947 mbar = 0.068046 atmosphere.

psi bar mbar atm Kg/cm2 Pa kPa MPa ” H20 ft H20 cm H2O m H20 ” Hg mm Hg
(Torr)
cm Hg
1 0.068948 68.948 0.068046 0.070307 6,894.8 6.8948 0.0068948 27.680 2.3067 70.307 0.70307 2.0360 51.715 5.1715
14.504 1 1,000 0.98692 1.0197 100,000 100 0.1 401.46 33.455 1019.7 10.197 29.530 750.06 75.006
0.014504 0.001 1 0.0009869 0.001020 100 0.1 0.0001 0.40146 0.033455 1.0197 0.010197 0.029530 0.75006 0.075006
14.696 1.0132 1013.2 1 1.0332 10132 101.32 0.10132 406.78 33.899 1033.2 10.332 29.921 760.00 76.000
14.223 0.98066 980.66 0.96784 1 98066 98.066 0.098066 393.70 32.808 1,000 10 28.959 735.56 73.556
0.000145 0.00001 0.01 0.0000099 0.00001 1 0.001 0.000001 0.0040146 0.00033455 0.010197 0.00010197 0.000295 0.007501 0.00075
0.14504 0.01 10 0.0098692 0.010197 1,000 1 0.001 4.0146 0.33455 10.197 0.10197 0.29530 7.5006 0.75006
145.04 10 10,000 9.8692 10.197 1,000,000 1,000 1 4014.6 334.55 10197 101.97 295.30 7,500.6 750.06
0.036127 0.0024909 2.4909 0.0024583 0.00254 249.09 0.24909 0.0002491 1 0.083333 2.5400 0.025400 0.073556 1.8683 0.18683
0.43353 0.029891 29.891 0.029500 0.030480 2,989.1 2.9891 0.0029891 12 1 30.480 0.30480 0.88267 22.420 2.2420
0.014223 0.000981 0.98066 0.0009678 0.001 98.066 0.098066 0.0000981 0.39370 0.032808 1 0.010 0.028959 0.73556 0.073556
1.4223 0.098066 98.066 0.096784 0.1 9,806.6 9.8066 0.0098066 39.370 3.2808 100 1 2.8959 73.556 7.356
0.49115 0.033864 33.864 0.033421 0.034532 3,386.4 3.3864 0.0033864 13.595 1.1329 34.532 0.34532 1 25.4 2.54
0.019337 0.0013332 1.3332 0.0013158 0.001360 133.32 0.13332 0.0001333 0.53524 0.044603 1.3595 0.013595 0.039370 1 0.1
0.19337 0.013332 13.332 0.013158 0.013595 1,333.2 1.3332 0.0013332 5.3524 0.44603 13.595 0.13595 0.39370 10 1

New VSH Airtorch® Model

For 500Kw – 6 MW
New VSH Airtorch® Model