The lower heating value is the basic unit to calculate annual energy in estimating an energy gain factor. Reliability of an energy gain factor depends on the accuracy of the lower heating value. However, the deviation of heating value is large, and there is no common standard. Thus, the present methods of estimating the lower heating value (calorimeter method, ultimate analysis method, etc.) are inferior in accuracy. Besides, the conventional estimation method cannot reflect the waste's inhomogenous properties or seasonal effect. Hence, this study estimated the lower heating value on the basis of relation between heat input and heat output in equilibrium state by using the law of conservation of energy and the first law of thermodynamics for industrial waste incineration facilities (57 facilities) currently in operation. In the case of self-contained boilers, the lower heating value was an average of kcal/kg (1,984-6,476 kcal/ kg), and in case of separable boilers, the lower heating value was estimated to be an average of 3,787 kcal/kg (1,621- 486 kcal/kg).

I. 서 론
 II. 연구방법 및 내용
  1. 조사대상 시설 및 조사항목
  2. 저위발열량(Lower calorific value) 산정방법
 III. 결과 및 고찰
  1. 저위발열량 산정 예제
  2. 저위발열량(Lower calorific value) 산정 결과
 IV. 결 론
 References

• 권영현(국립환경과학원 폐자원에너지연구과) | Young-Hyun Kwon
• 손준익(국립환경과학원 폐자원에너지연구과) | Jun-Ik Son
• 김기헌(국립환경과학원 자원순환연구과) | Ki-Heon Kim Corresponding author