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To reduce Amount of energy consumption and Energy cost,
  • It can be managed,
    by Factory total (whole factory) ---
    by Process Line ---
    by Facility (machine) individually ---
  • Management in small unit (facilities/machines) is more suitable for improvement of energy intensity than in large unit (factory total).
  • To be shown in Energy Intensity.
    because, it is easier to evaluate the result of operational/technical improvement comparing with before-improvement.

“Energy Intensity” (or “energy unit consumption”)
As the management of energy, “Energy Intensity” is widely accepted.

The definition is:

“Energy Intensity” can be applied for “whole factory”, “individual process line”, “each machines”.

“Energy consumption amount”
--- heat (J) and/or electric power (Kwh) (→ combined in crude oil equivalent)
--- can be represented by individual particular unit --- steam: ton, water: m3, fuel: Kl etc.

“Production amount”
--- unit: weight (tonnage), number of products, treated area(m2), working time (h), etc.

Example: energy intensity of boiler

  1. The condition of boiler operation
    1. steam production rate (without electric generation) 4,090 ton per month
    2. fuel consumption rate (LHV=41.7 GJ/k-litter) 300 kl per month (bunker-C)
  2. Calculation
    energy intensity of boiler = fuel consumption / steam production = 300,000 l / 4,090 ton
    = 73.3 l-Bunker-C / t-Steam = 3.06 GJ / t-Steam
    the price of Bunker-C is 34,000 Yen / kl, shown by energy cost : 2,492 Yen / t-Steam

Achieving energy management

How to find out targets (matters) should be managed
Example : Factor analysis < cause and effect diagram “fish bone chart” > --- 7tools

= View point of energy species =


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