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2. Thermal efficiency - Wikipedia

   en.wikipedia.org/wiki/Thermal_efficiency

   A counter flow heat exchanger is the most efficient type of heat exchanger in transferring heat energy from one circuit to the other [citation needed]. However, for a more complete picture of heat exchanger efficiency, exergetic considerations must be taken into account. Thermal efficiencies of an internal combustion engine are typically higher ...

3. Industrial furnace - Wikipedia

   en.wikipedia.org/wiki/Industrial_furnace

   The floor of the furnace is mostly made of a different material from that of the wall, typically hard castable refractory to allow technicians to walk on its floor during maintenance. A furnace can be lit by a small pilot flame or in some older models, by hand. Most pilot flames nowadays are lit by an ignition transformer (much like a car's ...

4. Air changes per hour - Wikipedia

   en.wikipedia.org/wiki/Air_changes_per_hour

   Air changes are often cited as a means of preventing condensation in houses with forced ventilation systems often rated 3–5 ACH though without referencing the size of the house. However, where ACH is already greater than 0.75 a forced ventilation system is unlikely to be of use at controlling condensation and instead insulation or heating are ...

5. Turndown ratio - Wikipedia

   en.wikipedia.org/wiki/Turndown_ratio

   [citation needed] A thermal mass flow meter has a turndown ratio of 1000:1. An orifice plate meter has a practical turndown ratio of 3:1. A turbine meter has a turndown ratio of 10:1. Rotary positive displacement meters have a turndown ratio of between 10:1 and 80:1, depending on the manufacturer and the application.

6. Electric arc furnace - Wikipedia

   en.wikipedia.org/wiki/Electric_arc_furnace

   Industrial arc furnaces range in size from small units of approximately one-tonne capacity (used in foundries for producing cast iron products) up to about 400-tonne units used for secondary steelmaking. Arc furnaces used in research laboratories and by dentists may have a capacity of only a few dozen grams. Industrial electric arc furnace ...

7. How to safely restart your wall heater — and get help if needed

   www.aol.com/news/safely-restart-wall-heater-help...

   Renters don't need to send their landlord proof of the issue.But if there's visible damage to the heater, or if the gas company disconnects service and leaves a red tag on the furnace, take a ...