Numerical and experimental simulation of gas-liquid two-phase flow in 90-degree elbow

Zahedi, Rahim; Rad, Ali Babaee

doi:10.1016/j.aej.2021.07.011

Cited by 45 publications

(12 citation statements)

References 54 publications

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“…In theory, it can be assumed that, given the abundance of oil and gas reserves, Iran is able to delay any effort to develop renewable energy [63]. However, environmental impacts play an important role in policymakers' decisions, and the continuous increase in the use of fossil fuels in Iran has had a detrimental effect on health and the environment.…”

Section: Background Potential and Rationale For Renewable Energy Deve...mentioning

confidence: 99%

Strategic Study for Renewable Energy Policy, Optimizations and Sustainability in Iran

Zahedi

Ahmadi

2022

Sustainability

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The present article includes studies on the importance of addressing strategic issues in the field of general policies adopted and strategies for the development of renewable energy in Iran. Considering that energy is one of the determining indicators in economic development and the development and optimization of renewable energy can play an effective role in economic growth and protection of environmental conditions, this article tries to introduce the types of renewable energy and general principles. They point to the policies that ultimately determine the priority and necessity of using some of them for the country and explain why and how to use them. The general principles discussed in this article include the advantages, disadvantages, potentials, and, most importantly, comparative comparisons with two neighboring countries. The results of these studies show that despite Iran’s diverse potentials in the field of renewable energy, wind energy has a higher priority than other cases in terms of economic justification and market competition, and domestic production rates. Other renewable energy sources for power generation and grid connection are less of a priority for short- or medium-term investment. However, for non-grid use in the country, they can also be very useful in the short term. In general, Iran can be a hub for renewable energy.

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Section: Background Potential and Rationale For Renewable Energy Deve...mentioning

confidence: 99%

Strategic Study for Renewable Energy Policy, Optimizations and Sustainability in Iran

Zahedi

Ahmadi

2022

Sustainability

Self Cite

View full text Add to dashboard Cite

show abstract

“…The principle of comparative judgment also refers to the binary comparison of elements in a level of hierarchical structure. In this way, in AHP, the elements of each level are compared in pairs, and according to (Table 1), their relative weight is calculated in relation to their corresponding element at a higher level [25]. These weights can be calculated individually or a combination of expert judgment, in which case the answers become a single answer using a geometric mean to combine different expert opinions.…”

Section: Analytic Hierarchy Process (Ahp)mentioning

confidence: 99%

Potential and Economic Evaluation of Biogas Resources and Location of its Power Plants with GIS in Iran

SF¹,

Zahedi²,

Hajinezhad³

2022

annagriccropsci

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Excessive consumption of fossil fuels has led to threats to energy reserves and environmental issues as two common concerns of today’s societies. On the other hand, renewable energy sources have been growing as alternative sources to reduce severe environmental problems such as global warming, climate change, and acid rain. As a result, it is necessary to assess the potential of renewable resources and the location of power plants related to them. Among renewable energies, biomass energy and biogas have a high status and importance, accounting for a significant share of energy production. Therefore, choosing a suitable location for biogas power plants in energy production and transmission, cost reduction, and environmental aspects. Today, the use of GIS has made it possible to integrate the information needed for location effectively. Therefore, in this study, while identifying the influential factors and criteria in the location of biogas power plants and the AHP hierarchical analysis process as one of the multi-criteria MCDSS decision-making methods to the location of biogas power plants in Iran, as one of the criticalroles in the production of agricultural biomass, livestock and poultry, and waste has been addressed. The results of the economic analysis showed that the construction of biogas power plants is justified in cities where the cost of the power plant is less than 0.098 USD per cubic meter of gas produced and the average cost of biomass is less than 0.0915 USD per cubic meter of synthetic gas.

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“…In their research, Hushang et al [11,12] improved the gas transfer motors in the solar Stirling engine to increase efficiency and also improved the gas displacement variables, including the amplitude, state, and frequency of the Stirling motor so that the heat efficiency and production capacity The engine increases. In order to ensure the calculations of the mathematical model, an experiment was designed and performed on a gamma-type Stirling engine using a thirdorder thermodynamic analysis program, during which the absolute fluid pressure, crankshaft angle, and velocity were read and recorded instantly [13]. Also, the generating power of the engine was measured using a generator, and the results of the mathematical model were compared with the measured values under the same test conditions and its performance was ensured, and the average error of the mathematical and experimental simulations was about 10%.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of gamma Stirling refrigerator to convert thermal to cooling energy utilizing different gases

Asemi¹,

Daneshgar²,

Zahedi³

2023

futech

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In recent years, combined cooling, heat, and power (CCHP) systems have attracted increasing attention worldwide. Owing to their advantages of high overall thermal efficiency, fuel flexibility, low noise and vibration, and low emissions, Stirling engines are promising candidates for micro-CCHP systems. The Stirling Cycle is one of the thermodynamic cycles that is close to the Carnot cycle in terms of theory, and these advantages cause to use of Stirling engines in wide industries. The main objective of this research is an experimental investigation of the Stirling Gamma engine for refrigeration. In this investigation, the effect of working fluid air and Helium, the operating pressure of the working fluid, and dynamo power on refrigeration generation have been investigated. Results show that using air fluid with a power of 520.8 Watts and operating pressure of 3 bar in 10 minutes could reach to the temperature of -23° Celsius and using Helium fluid with a power of 420 Watts and operating pressure of 6 bar and in 10 minutes could reach to temperature -21° Celsius. In the experimental implementation, it has been tried to reach lower than 10 % error results in various parts of the engine like insulation, leaking, belt lash, and measurement devices. Results show that increasing power supply, mean gas pressure, power supply turning on duration, and using fluids such as air and helium are effective in refrigeration. Also, by using helium instead of air, the amount of cooling output and engine output power decreases while engine efficiency increases.

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Numerical and experimental simulation of gas-liquid two-phase flow in 90-degree elbow

Cited by 45 publications

References 54 publications

Strategic Study for Renewable Energy Policy, Optimizations and Sustainability in Iran

Strategic Study for Renewable Energy Policy, Optimizations and Sustainability in Iran

Potential and Economic Evaluation of Biogas Resources and Location of its Power Plants with GIS in Iran

Experimental investigation of gamma Stirling refrigerator to convert thermal to cooling energy utilizing different gases

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