Simulasi Cfd Ang Storage dengan Metana sebagai Adsorbat dan Karbon Aktif sebagai Adsorbennya

Increased air pollution and fuel price volatility to the attention of the world that began to study alternative energy sources. Natural gas is an alternative that can replace fuel, natural gas used was methane. There are 3 natural gas storage process LNG, CNG and ANG. LNG requires extremely low temperatures to liquefy the methane gas whereas CNG requires a very high pressure of 200 bar for storing methane, both of these processes require a very expensive cost, whereas ANG only requires a pressure of 4 bar for storing methane so that ANG is an excellent alternative possible. ANG process has been studied experimentally, while the simulation is still very rare. This study uses the simulation computational fluid dynamics (CFD) for the ANG. This modeling using Fluent. From this simulation can be obtained the distribution of temperature, pressure, adsorption capacity and adsorption rate of capacity during the adsorption process occurs. The study was conducted at a pressure of 30 bar and a temperature of 300 K, in order to obtain the result of pressure and temperature distribution are influenced by the UDF equation source terms and methane gas adsorption capacity at the time of 54000 seconds is 0.069797 kg/kg, and the rate of adsorption at the time of 54000 seconds is 5.1x10-9kg/kg.s

Adsorpsi Isothermal Hidrogen pada Karbon Aktif Berbahan Dasar Cangkang Sawit pada Temperatur 45 OC

Hydrogen is one of the promising renewable energy and potential subtitute for fossil fuels in the future. Hydrogen has short comings in its application as fuel is in storage. The study resulted in the capacity of hydrogen adsorption on activated carbon made from palm shells. Data were collected by volumetric method in the isothermal adsorption process. Adsorption isotherm temperature is performed at 45oC at pressures up to 30 bar. The maximum adsorption capacity at isotherm temperatures 45oC is 2.03x10-3 kg/kg mass of adsorbent at a pressure of 30.13 bar. Subsequently correlated the data obtained using the Langmuir model equation, Toth and Langmuir-Freundlich. Deviation from the Langmuir equation, Toth and Langmuir-Freundlich obtained was 16.72.77%, 15.97% and 9.79%

Modeling of a New Structure of Precision Air Conditioning System Using Secondary Condenser for Rh Regulation

A dynamic mathematical model for a new structure of precision air conditioning (PAC) has been developed. The proposed PAC uses an additional secondary condenser for relative humidity regulation compared to a basic refrigeration system. The work mechanism for this system and a vapour-compression cycle process of the system are illustrated using psychrometric chart and pressure-enthalpy diagram. A non-linear system model is derived based on the conservation of mass and energy balance principles and then linearized at steady state operating point for developing a 8th-order state space model suited for multivariable controller design. The quality of linearized model is analyzed in terms of transient response, controllability, observability, and interaction between input-output variables. The developed model is verified through simulation showing its ability for imitating the nonlinear behavior and the interaction of input-output variables

Adsorpsi Isotermal Co2 Bertekanan Tinggi Pada Karbon Aktif Dengan Metoda Volumetrik

High Pressure Adsorption Isotherm of CO2 on Activated Carbon using Volumetric Method. Adsorption system is ones of the most effective methods for CO2 separating with other substances that produced from the burning of fossil fuels. In the design for that application, beside of characteristics of porous material (adsorbent) data, CO2 adsorptiondata on the adsorbent (kinetic and thermodynamic) are also needed. The aim of this research is resulting isothermal adsorption data at pressures up to 3.5 MPa by indirect methods (volumetric method) at isothermal temperature of 300, 308, 318 and 338 K. Adsorbent that used in this research is activated carbon made from East of Kalimantan coals byphysical activation method (CO2) which is the surface area of activated carbon is 668 m2/g and pore volume is 0.47 mL/g. Carbon dioxide (CO2) that used in this research is high purity carbon dioxide with a purity of 99.9%. Data from the experiment results then correlated using the Langmuir and Toth equations model. The results showed that the maximum adsorption capacity is 0.314 kg/kg at 300 K and 3384.69 kPa. The results of regression of experiment data using Langmuir and Toth models were 3.4% and 1.7%