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천연가스의 음속, 비열, 엔탈피 계산

Calculations of Sonic Velocity, Specific Heat, Enthalpy for Natural Gas

하영철^† 이철구

Youngcheol Ha^† Cheolgu Lee

한국가스공사 연구개발원 유체유동연구실, 안산 425-150

Fluid Flow Research Lab., R&D Training Center, KOGAS, Ansan 425-150, Korea

fractals@kogas.or.kr

HWAHAK KONGHAK, December 2001, 39(6), 678-684(7), NONE

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Abstract

본 연구는 천연가스 관련 업계에 필요한 음속, 비열, 엔탈피의 정확한 계산방법을 제시하고자 수행하였다. 이를 위해 실제 가스에 대한 이들 물성의 계산식을 유도하였고, 계산에 필요한 이상기체 물성과 천연가스 밀도는 Macfall 식(불확도 ±0.05%)과 AGA 8-DC('94)(불확도 ±0.1%)식을 각각 사용하여 구하였다. 계산값의 불확도를 확인하기 위해, 음속의 경우 실험값과 비교하였고 비열과 엔탈피는 상대민감도를 이용하여 불확도 분석을 하였다. 그 결과 천연가스가 사용되는 대부분의 조건에서 ±0.1% 내외로 이들 물성값을 예측할 수 있음을 확인하였다.

This study was conducted to suggest the highly accurate calculation method of sonic velocity, specific heat and enthalpy widely used in the natural gas industry. The equations of these properties for natural gas were derived, Macfall's eqs. (uncertainty ±0.05%) and AGA 8-DC('94) eqs. (uncertainty ±0.1%) were used for predicting the ideal gas properties and compressibility of natural gas needed to solve the equations. To verify the uncertainty of the calculated values, the sonic velocity was compared to the experimental data and the uncertainty analyses using the relative sensitivity method were performed for specific heat and enthalpy. The results showed that these properties were accurately predicted near ±0.1% in most flow conditions of natural gas.

Keywords

Natural Gas Sonic Velocity Specific Heat Enthalpy

References

Zimmerman RH, Par Research Project NX-19, American Gas Association (1962)
Lueptow RM, Scott P, GRI Report No. 94/0135, Gas Research Institute, U.S.A. (1994)
Grimley TA, GRI Report No. 96/0291, Gas Research Institute, U.S.A. (1996)
Savidge JL, International Gas Research Conference, Tokyo, Japan 989 (1989)
AGA Report No. 8, American Gas Association (1994)
Ha Y, Her J, chang S, HWAHAK KONGHAK, 37(4), 582 (1999)
Park KA, Korea Research Institute of Standards and Science, Daejon City, Private Communication (1999)
ISO 12213, International Organization for Standardization, Geneva (1997)
Thomas JB, GRI Report No. 93/0396, Gas Research Institute, U.S.A. (1993)
Perry RH, "Perry's Chemical Engineers' Handbook," 6th ed., McGraw-Hill, Company, 5-5, 4-66 (1987)
Aly FA, Lee LL, Fluid Phase Equilib., 6, 169 (1981)
McFall RL, Master Thesis, University of Oklahoma, Oklahoma, U.S.A. (1984)
ISO/TR 5168, International Organization for Standardization, Geneva (1998)
Younglove BA, Frederick NV, McCarty RD, NIST Monograph 178, National Institute of Standards and Technology, U.S.A. (1993)
"Daily Report for Gas Analysis," Korea Gas Corporation (1999)
Her JY, Lee YC, Kogas Project No. 00-KA-PI-수시-031-00, Korea Gas Corporation (2000)