HITACHI : Environmental Saving Plan

1. Trends in Amount of Used Energy

We promote energy conservation and CO₂ output control in order to help prevent global warming.

CO₂ Emission per Unit Production

2. Recent Major Measures

1998

No	Reduction Item	No. of Cases
1	Improved insulation of large furnaces	2
2	Introduction of cogeneration equipment	1
3	Optimization of AC operation	16
4	Integration of heat treatment processes, etc.	20
Subtotal		39

1999

No	Reduction Item	No. of Cases
1	Pressure change of high-pressure air equipment, etc.	7
2	Improved power factor of electric power equipment, etc.	6
3	Control of pump inverter, etc.	7
4	Suitable adjustment of blowing capacity of AC, etc.	9
5	Suitable adjustment of clean room lighting, etc.	6
Subtotal		35

2000

No	Reduction Item	No. of Cases
1	Installation of inverter lighting equipment, etc.	4
2	Installation of energy saving AC, etc.	11
3	Installation of steam absorption refrigerators, etc.	3
4	Improved manufacturing equipment, etc.	9
Subtotal		27

3. Cogeneration system

(1) Outline

This is a system designed to reduce CO₂ emissions, a factor in global warming, by utilizing the waste heat generated simultaneously with electricity to generate steam and thereby improve overall energy efficiency.

(2) Features

	Energy efficiency: 80% (electrical power: 28.4%; steam: 51.6%) Note: In the case of commercial power generation: 35%
	Reduction in energy consumption: 12%
	Reduction in CO₂ emissions: 22% (470 t/month) Operation launch: September 1998

(3) Major specifications

Item	Specifications
Main equipment	Typhoon M
Power output	4,500kw class
Steam output	11.0ton/h
(All steam is used for production)
Steam pressure	10kg/cm²
Fuel	City gas 12A
NOx reduction method	Purified-water injection
Regulated NOx amount	30ppm