Method of Heat transmission
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Conduction
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Convection
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Radiation |
In general, conduction and convection require heat-transmitting media such as solid, liquid, or gas. However, in the process of heat transmission by conduction and convection, most of heat is wasted. Radiation has higher thermal efficiency by directly transmitting the heat to the object without requiring any media.
Infrared radiation, one of the electromagnetic radiations, travels in a straight line at the speed of light from the heat source. In the process of travel, the energy of infrared radiation is not absorbed by air and directly transmits the heat to heated substance from the heat source; therefore infrared radiation is a very efficient source of radiant energy.
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Comparison
of Different Heating Source
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Hot Air
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Tubular Metal Heater
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Medium wave I.R. Quartz Emitter
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Short Wave I.R. Quartz Emitter
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Physical Strength
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medium
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high
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medium
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medium
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Accuracy of Temperature Control
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Low
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Medium
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Medium
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High
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Dust Pollution
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High
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Medium
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Low
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Low
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Radiant Efficiency
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Low
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Medium
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High
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High
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Max. Temperature of element surface
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400 °C
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700 °C
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600 °C
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750 °C
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Life
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2 year
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1-2 year
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1-2 year
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5000 hrs
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Heat Up
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very slow
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slow
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fast (1-2 mins)
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very fast (1-2 secs.)
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Infrared Emission
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Long Wave
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Long Wave
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Medium Wave
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Short Wave
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