Abstract
The radiation and total efficiencies, the amount of gas radiation from vapour and carbon dioxide and contribution from convective heat transfer for different operating conditions have been measured and modelled in an industrial gas heated IR dryer. Instrumentation to facilitate the measurement of the spectral distribution of the radiation heat fluxes in industrial infrared equipment has been developed. The radiation efficiency ranges between 35 to 39 % and the total energy efficiency has been calculated as 28-31 %. This is in good agreement with previous measurements. The emitter radiosity was measured as 101 kW/m(2) which is in reasonable agreement with the calculated value of 115 kW/m(2). The total efficiency can be much improved if the excess air factor is reduced or the preheating temperature of the combustion air is increased. More work could be directed towards improvements of the gas flow behaviour between emitter and web, contributing to increased convective heat transfer to the web. (Less)
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