DEVELOPMENT OF VOLUME TO MASS CONVERSION MODEL FOR NGV DISPENSING UNIT USING THERMODYNAMIC PROPERTIES

• Main Author: Abu Hassan, Nadiah
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi Petronas 2004
• Subjects: TP Chemical technology
• Online Access: http://utpedia.utp.edu.my/7140/1/2004%20-%20DEVELOPMENT%20OF%20VOLUME%20TO%20MASS%20CONVERSION%20MODEL%20FOR%20NGV%20DISPENSING%20UNIT%20USING%20THERMODYNAMIC.pdf; http://utpedia.utp.edu.my/7140/

This research project is initiated as one of the sub studies in the implementation of natural gas vehicle usage in Malaysia. Developing a natural gas refueling station at lower cost is a challenge that needs to be handled by the university. One of the areas of interest is in the metering system. Regulatory requirement states that natural gas must be measured in mass flow rate. Coriolis meter is the only available mass flow meter in the market. But this meter is too costly. Thus a study to develop a cheaper metering system is required. The best alternative is by measuring the flow rate of natural gas and then converts it to mass flow rate. This conversion can be done in various ways of calculations. Manual calculation using Equation of State, combination of several Equations of State and Activity Coefficient Method are the most commonly used method of calculation for natural gas component. The author used several equations of state in order to complete this research. But first, the properties of the natural gas such as its composition, vapor pressure and critical properties need to be determined first. The calculation starts with the study to find the variation in mass as pressure of the natural gas is changed. For this calculation purpose, the tank is considered as an isothermal system with temperature maintained at 30°C. The system that been studied is theNGV's tank which volume is constant (55 liters). The calculation is done using Soave Redlich Kwong EOS and Peng Robinson EOS. To compare the data with the ideal condition, a plot using ideal gas equation is done as well. The calculation is repeated at different composition to see how the variations in composition affect the behavior of the graph. Finally, the variation in mass as a function of temperature and pressure is done. At this stage, HYSIS is used to determine the data for the plot. The equations that been considered in the calculation are Soave Redlich Kwong EOS, Peng Robinson EOS and LeeKesler Plocker EOS. The graphs areplotted to seethe relationship.