Optimization of power and heat dual generation cycle of gas microturbines through economic, exergy and environmental analysis by bee algorithm

Daneshgar, Sareh; Zahedi, Rahim

doi:10.1016/j.egyr.2021.12.044

Cited by 34 publications

(14 citation statements)

References 21 publications

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“…The variables φ, rc, l2, l1, d, c2, c1, and a1 to a3 are the structural variables of the engine and have a constant value. Equations ( 1) and ( 2) relate these variables to b1 and b2 (the vertical distance of the semicircle axis at any time up to the crankshaft direction) [23].…”

Section: Mathematical Modelingmentioning

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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Section: Mathematical Modelingmentioning

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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“…Energy policy in recent years has become particularly important in terms of increasing the role of energy and the environment in the economic, political, and social activities of different societies [42]. However, in the past, after the oil shock of 1973, in which the Arab countries producing crude oil closed the oil valves on the Western world, there has always been concern about the recurrence of such a situation in developed countries and in recent years in developing countries such as China and India have existed.…”

Section: Strategic Policies For Renewable Energymentioning

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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“…In order to obtain a statement to calculate the initial airflow exergy rate, we assume that the surface temperature of the plates is constant throughout the length of the plate, which is a reasonable assumption for this type of cooler. The rate of production of primary exergies of such plates is as follows, which includes two parts: output and output [13,14].…”

Section: Analysis Of the Second Law For Indirect Plate Evaporative Co...mentioning

confidence: 99%

Theoretical analysis of the performance and optimization of indirect flat evaporative coolers

Asemi¹,

Zahedi²,

Daneshgar³

2022

fuen

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External-cooling indirect evaporative coolers with different configurations and working air sources are incomprehensively analyzed and compared so far. This paper investigates the mechanism and theory of operation of indirect flat-panel evaporative coolers based on X-analysis. Then, based on the second law of thermodynamics analysis, the entropy production rate of the flat-plate heat exchanger of the cooler is calculated. As a result of this analysis, the optimal energy efficiency-evaporation efficiency and cooling capacity values are presented in terms of effective parameters in the design.

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Optimization of power and heat dual generation cycle of gas microturbines through economic, exergy and environmental analysis by bee algorithm

Cited by 34 publications

References 21 publications

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

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

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

Theoretical analysis of the performance and optimization of indirect flat evaporative coolers

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