METI/ECCJ/AOTS Training Program Vietnam

METI/ECCJ/AOTS Training Program

Vietnam

Energy cost ratio by industry type

Energy Conservation Guidebook for Factories, 2004-3 Edition

Number of audits

The one-day audits for the small and medium industries (SMEs) are handled by the Small Business Corporation.
The measurement diagnoses are those including measurements by brought-in instruments, recording and analysis, consisting of (1 day for instrument installation + 2 to 3 daysf data collection + 1 day for withdrawing). Subsequently, analysis and report preparation are done for which fees are charged (but the fees are taken care of by the Small Business Corporation).
The audits for large-scale factories (type 1 factories) are handled by NEDO. The pay audits are done exclusively by ECCJ. Business enterprises do not pay for software-type works.
In fiscal 2004, ECCJ conducted genergy conservation + management standardsh diagnoses for buildings.

Energy Conservation of Combustion
- air ratio and air preheating

Content
2 Optimization of air ratio
3 The air ratio is calculated from the O2 content (O2%) in the exhaust gas.
4 Larger air ratio leads to larger heat loss with the exhaust gas.
5 Fuel saving by air ratio improvement
6 Effect of air ratio reduction
7 Criteria for air ratio (standard values)
8 Criteria for air ratio (target value)
9 Energy conservation by air preheating
10 Utilization of waste heat of exhaust gas - air preheating
11 Criteria for exhaust gas temperature
12 Criteria for factories

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.

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