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1
Content available Thermodynamic analysis of medium pressure reciprocating natural gas expansion engines
Farzaneh-Gord M., Izadi S., Pishbin S. I., Sheikhani H., Deymi-Dashtebayaz M.
Polish Journal of Chemical Technology
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2015
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Vol. 17, nr 2
119-125
EN
Natural gas pressure has to be reduced from medium pressure of 1.724 MPa (250 psia) to lower pressure of 0.414 MPa (60 psia) at Town Border pressure reduction Station (TBS). Currently, the pressure reduction is carried out by throttling valves while considerable amount of pressure energy is wasted. One of the equipment which could be used to recover this waste energy is the reciprocating expansion engine. The purpose of this research is to simulate one-sided reciprocating expansion engine thermodynamically for TBS pressure range. The simulation is based on first law of thermodynamics, conversation of mass and ideal gas assumptions. The model could predict in-cylinder pressure and in-cylinder temperature at various crank angles. In addition, the effects of the engine geometrical characteristics, such as intake and exhaust port area and ports timing on the Indicated work per cycle output are investigated.
2
Content available Simultaneous thermodynamic simulation of CNG filling process
Deymi-Dashtebayaz M., Farzaneh-Gord M., Reza Rahbari H
Polish Journal of Chemical Technology
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2014
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Vol. 16, nr 1
7-14
EN
In CNG station, the fuel is usually stored in the cascade storage bank to utilize the station more efficiently. The cascade storage bank is generally divided into three reservoirs, commonly termed low, medium and high-pressure storage bank. The pressures within these reservoirs have huge effects on the performance of the stations. In the current study, a theoretical simulation based on mass balance and thermodynamic laws has been developed to study the dynamic fast fi lling process of vehicle’s (NGV) cylinder from the cascade storage bank. The dynamic change of the parameters within the storage bank is also considered. Natural gas is assumed to contain only its major component, methane, and so thermodynamic properties table has been employed for finding the thermodynamics properties. Also the system is assumed as a lumped adiabatic system. The results show that the initial pressure of the cascade storage bank has a big effect on the storage bank volumes for bringing up the NGV cylinder to its target pressure (200 bar). The results also showed that ambient temperature has effect on the refueling process, chiefly the final NGV cylinder and the cascade storage bank conditions.
3
Content available Optimizing Natural Gas Fueling Station Reservoirs Pressure Based on Ideal Gas Model
Farzaneh-Gord M., Deymi-Dashtebayaz M.
Polish Journal of Chemical Technology
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2013
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Vol. 15, nr 1
88-96
EN
At CNG fuelling station, natural gas is usually stored in a cascade storage system to utilize the station more efficient. The cascade storage system is generally divided into three reservoirs, commonly termed low, medium and high-pressure reservoirs. The pressures within these three reservoirs have huge effects on the performance of a CNG fuelling station and a fast filling process of natural gas vehicle’s (NGV) cylinder. A theoretical analysis is developed to study the effects of the reservoirs pressures and temperatures on the performance of the CNG station. The analysis is based on the first and the second law of thermodynamics, conservation of mass and ideal gas assumptions. The results show that as the reservoir temperature decreases, the fill ratio increases and the pressure within the filling station reservoirs has no effects on the fill ratio. The non-dimensional entropy generation and filling time profiles have opposite trends and as entropy generation decreases, the filling time increases. The optimized non-dimensional low and medium pressure-reservoir pressures are found to be as 0.24 and 0.58 respectively in thermodynamic point of view.
4
Content available Analytical solution for magnetohydrodynamic stagnation point flow and heat transfer over a permeable stretching sheet with chemical reaction
Rasekh A., Farzaneh-Gord M., Varedi S. R., Ganji D. D.
Journal of Theoretical and Applied Mechanics
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2013
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Vol. 51 nr 3
675--686
EN
This work deals with the problem of steady two-dimensional magnetohydrodynamic (MHD) stagnation point flow towards a permeable stretching sheet with chemical reaction. The fundamental equations of the boundary layer are transformed into ordinary differential equations, which are then solved analytically using the Optimal Homotopy Asymptotic Method (OHAM). Comparisons are made between the results of the proposed method and the numerical method (fourth-order Runge-Kutta) in solving this problem, and excellent agrement has been observed. Subsequently, effects of different involved parameters on the temperature profiles, concentration profiles, local Nusselt number, local Sherwood number and skin-friction coefficient are presented and discussed in detail.
5
Content available The effect of important parameters on the natural gas vehicles driving range
Farzaneh-Gord M., Rahbari H.R., Nikofard H.
Polish Journal of Chemical Technology
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2012
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Vol. 14, nr 4
61-68
EN
One of the most important issues regarding Natural Gas Vehicles (NGVs) is the Driving Range, chich is defi ned as capability of a NGV to travel a certain distance after each refueling. The Driving Range is a serious obstacle in the development and growth of NGVs. Thus the necessity of studying the effects of various parameters on the Driving Range could be realized. It is found that the on-board storage capacity and the natural gas heating value have the greatest effect on the Driving Range. The charge mass of NGV cylinders is varied due to the natural gas composition and the fi nal in-cylinder values (temperature and pressure). Underfi lling of NGV cylinders, during charging operations, is a result of the elevated temperature which occurs in the NGV storage cylinder, due to compression and Rother processes could be overcome by applying extensive over-pressurization of the cylinder during the fuelling operation. Here, the effects of the most important parameters on the Driving Range have been investigated. The parameters are natural gas composition, engine effi ciency and fi nal NGV on-board in-cylinder temperature and pressure. It is found that, the composition has big effects on the Driving Range. The results also show that as fi nal in-cylinder pressure decreases (or temperature increases), the Driving Range will be increased.
6
Content available Developing novel correlations for calculating natural gas thermodynamic properties
Farzaneh-Gord M., Rahbari H.R.
Chemical and Process Engineering
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2011
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Vol. 32, nr 4
435-452
EN
Natural gas is a mixture of 21 components and it is widely used in industries and homes. Knowledge of its thermodynamic properties is essential for designing appropriate processes and equipment. This paper presents simple but precise correlations of how to compute important thermodynamic properties of natural gas. As measuring natural gas composition is costly and may not be effective for real time process, the correlations are developed based on measurable real time properties. The real time properties are temperature, pressure and specific gravity of the natural gas. Calculations with these correlations are compared with measured values. The validations show that the average absolute percent deviation (AAPD) for compressibility factor calculations is 0.674%, for density is 2.55%, for Joule-Thomson coefficient is 4.16%. Furthermore, in this work, new correlations are presented for computing thermal properties of natural gas such as enthalpy, internal energy and entropy. Due to the lack of experimental data for these properties, the validation is done for pure methane. The validation shows that AAPD is 1.31%, 1.56% and 0.4% for enthalpy, internal energy and entropy respectively. The comparisons show that the correlations could predict natural gas properties with an error that is acceptable for most engineering applications.
7
Content available remote Numerical study of flow in a rotor-stator system with inward throughflow
Farzaneh-Gord M., Vazifedoost A., Khoshnevis A. B.
Archives of Mechanics
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2010
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Vol. 62, nr 3
195-214
EN
A numerical study has been carried out to study fluid flow within a rotor-stator system with an inward throughflow and pre-rotation. Furthermore, the effect of flow parameters on the flow structure has been investigated. The entrainment coefficient, beta, of the rotating fluid and the rotating disc moment coefficient have been calculated. A correlation has been found for predicting the place of stagnation point. The results show the Batchelor type of flow with two separated boundary layers on the rotating and stationary discs. The numerical results are compared with the available measured data and generally, a good agreement has been encountered.
8
Content available remote The first and second law analysis of a spark ignited engine fuelled with alternative fuels
Farzaneh-Gord M., Hajializadeh H., Khoshnevis A.
Archives of Thermodynamics
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2009
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Vol. 30, no. 1
73-92
EN
This paper presents a fundamental thermodynamic modelling approach to study spark ignited internal combustion engines. For simulating combustion and heat transfer, a one zone combustion chamber preserved together with zero dimensional and experimental models were used. By this analysis, in cylinder thermodynamic properties such as pressure and temperature of gases were achieved in each crank angle. The computations of the thermodynamic functions, especially availability, have been developed to seek better energy utilization, analyze engine performance and optimize design of spark ignition (SI) engines fuelled with fuels like methane, propane, methanol, ethanol and other fuels by using both the first and the second law analysis.
9
Content available remote Estimating recoverable work of an engine by utilizing the CO2 Brayton power cycle and capturing heat lost
Farzaneh-Gord M., Reza Behi M., Yahyaie A., Ali Akbar Mirmohammadi S.
Archives of Thermodynamics
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2009
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Vol. 30, no. 3
89-110
EN
The present work provided details of energy accounting of a natural gas powered internal combustion engine and recoverable work by utilizing a CO2 Brayton power cycle. Based on experimental performance analysis of a new designed IKCO (Iran Khodro Company) 1.7 liter natural gas powered ICE, full energy accounting of the engine was carried out on various engine speeds and loads. Further, two possible CO2 Brayton cycle configurations have been appointed to take advantages of engine heat lost. Based on thermodynamic analysis, the amount of recoverable work, obtainable by CO2 Brayton cycles have been calculated on various engine conditions. The results show that as much as 17 kW power could be generated by the power cycle which is a considerable amount of power especially if compared with the engine brake power.
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