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1-7.Energy cost ratio by industry type
1-7.Energy cost ratio by industry type
Energy Conservation Guidebook for Factories, 2006.3
1-8.Number of audits
1-8.Number of audits
2. Energy Conservation Technology
– combustion control
and heat insulation
  • Contents
    2-1 Optimization of air ratio
    2-2 The air ratio is calculated from the O2 content (O2%) in the exhaust gas.
    2-3 Larger air ratio leads to larger heat loss with the exhaust gas.
    2-4 Fuel saving by air ratio improvement
    2-5 Effect of air ratio reduction
    2-6 Criteria for air ratio (standard values)
    2-7 Criteria for air ratio (target value)
    2-8 Energy conservation by air preheating
    2-9 Utilization of waste heat of exhaust gas – air preheating
    2-10 Criteria for exhaust gas temperature
    2-11 Heat Insulation
    2-12 Criteria for factories
2-1.Optimization of air ratio
  • The excess air for combustion such as that in a boiler contributes only to an increase in heat loss with the exhaust gas.
  • The degree of excess air is expressed by air ratio. The air ratio at 1 (one) represents the theoretical combustion.
  • The air ratio is expressed by 21/(21-O2%) where O2 is oxygen content in the exhaust gas.
  • The Criteria of the Law for Rational Use of Energy set both standard and target values of air ratios for boilers and industrial furnaces.
2-1.Optimization of air ratio
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