Electric Air Heater Sizing for Tunnel
Electric Air Heater Sizing for Tunnel
(OP)
I'm working on a tunneling project and trying to determine if we have rented an adequate size heater to raise the air temperature in the work area from 20 degrees F to 50 degrees F. The work area is an open top, vertical shaft bored through rock - 63 feet diameter by 250 feet deep. We have a 150KW electric heater, with a maximum airflow of 7020 cfm. Any guideance is much appreciated.





RE: Electric Air Heater Sizing for Tunnel
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RE: Electric Air Heater Sizing for Tunnel
Compressed air (if the air compressor is working at the top of the shaft, and the air is released down low at the working surface, will cool the air in the tunnel bottom as it expands (often using in mining to bring "new" air into the tunnel mouth). Other machinery will release energy at the working surface. Water will cool it, unless you it a hot spring. Massive amounts of concrete will heat it for a little bit, then will end up at the rock temperature after a few days.
How much fresh air are you blowing down there for safety and to clear dust out?
RE: Electric Air Heater Sizing for Tunnel
RE: Electric Air Heater Sizing for Tunnel
RE: Electric Air Heater Sizing for Tunnel
How many lights and other electrical loads do you have? (Each will heat a little, but IR heat is definitely the best idea I've heard) How much OSHA-safety ventilation do you need and where?
RE: Electric Air Heater Sizing for Tunnel
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RE: Electric Air Heater Sizing for Tunnel
RE: Electric Air Heater Sizing for Tunnel