Development of Fundamental Equation of State for Thermodynamic Properties of Dimethyl Ether

• Main Author: Inarwan, Hanifianto
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/37938
• Institution: Institut Teknologi Bandung

Dimethyl ether is a widely known substance that is used as refrigerant, alternative fuel, propelan, and also as raw material for some chemical substances. Thermodynamic properties of dimethyl ether undoubtly become very important for using and producing dimethyl ether. Thermodynamics properties can be predicted by using equation of state. The existing equation of state of dimethyl ether has low accuration in the caloric properties hence a development of the equation of state is needed to predict thermodynamic properties with a better accuration. Helmholtz equation is used as a basic equation in developing a new equation of state. Theoritical aspects and thermodynamic consistency are also used as a reference to get a better equation of state. Combination of genetic algorithm and least square regression is used in optimation process of the equation of state. The equation of state in this study has absolute average deviation of 0.06% for isobaric ideal gas heat capacity, 0.58% for saturated vapor pressure, 0.20% for saturated liquid density, 3.31% for saturated vapor density, 0.06% for liquid density, 0.83%for vapor density, 0.24% for supercritical density, 0.36%, 2.65%, dan 1.38% for isochoric, isobaric, and saturated heat capacity respectively. The equation of state has absolute average deviation of 5.72%, 1.79%, and 4.62% for liquid, vapor, and supercritical speed of sound respectively. This equation also can be extrapolated rationaly up to 100 MPa in pressure and 600 K in temperature to predict thermodynamic properties of dimethyl ether.