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 a 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 a 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 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 efficiency air heating needs? Now offering new and improved with incredible warranty on heating elements. Please Contact MHI.
When comparing and 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 psig) 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). Please contact MHI for details.
LTA – Up to 900°C. LTA is a process heater for air which requires a compressed air input.
VTA – Up to 900°C. VTA is process gas heater with 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.
Large Flow MVTA. For 1000-1100°C. These are sealed process gas heater (THN or DNA class) with 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
| 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 measured at 1 atmosphere and 0°C. |
Airtorch Mode. Heat from cold to hot quickly.
Airtorch® Recuperator Mode. SH models accept inlet upto 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: Cubic meter/hour (m3/h) to cfm (cubic feet/minute)? Divide by 1.699.
Actual: 1 Cubic meter/second is equal to 2118.88 cfm
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Standard value 1 Nm^3/h is 0.62 SCFM
Or
1 SCFM =1.61 Nm^3/hr
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Air Flow Graph for Higher Temperatures
Temperature for Air Flow
Tips:
What are the best practices (oven use 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 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 become 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
New and improved with incredible warranty on heating elements
VTA900-10BL in use
(VTA900-10BL)
| The following table is provided as a tool to change back and forth between different pressure units. All values in each line and for their corresponding units are identical. For instance, in the first line of the table: 1 psi = 0.068947 bar = 68.947 mbar = 0.068046 atm … |
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