Energy, exergy, environmental, and economic modeling of combined cooling, heating and power system with Stirling engine and absorption chiller

Sheykhi, Mohammad Taghi; Chahartaghi, Mahmood; Balakheli, Mohammad Mahdi; Kharkeshi, Behrad Alizadeh; Miri, Seyyed Mahdi

doi:10.1016/j.enconman.2018.10.102

Cited by 65 publications

(25 citation statements)

References 29 publications

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“…Therefore, Equations( 29) and ( 30) can be presented. 34 where CO F 2 and CO W 2 are the carbon dioxide emission factors for fuel and network electricity, respectively.…”

Section: Environmental Analysismentioning

confidence: 99%

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Energy, exergy, economic, and environmental (4E) analyses and optimization of a CCHP system with steam turbine

Chahartaghi

Namdarian

Hashemian

et al. 2021

Energy Science & Engineering

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“…Therefore, Equations( 29) and ( 30) can be presented. 34 where CO F 2 and CO W 2 are the carbon dioxide emission factors for fuel and network electricity, respectively.…”

Section: Environmental Analysismentioning

confidence: 99%

“…The present net worth approach solves this by matching all costs at present. 34,35 The net present value of the investment cost (NPWC) is defined by Equation (32). 36 where C represents the cost of investment by the capacity for each element, and NC denotes the nominal element capacity.…”

Section: Net Present Value (Npv)mentioning

confidence: 99%

Energy, exergy, economic, and environmental (4E) analyses and optimization of a CCHP system with steam turbine

Chahartaghi

Namdarian

Hashemian

et al. 2021

Energy Science & Engineering

Self Cite

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“…In another study, Babaelahi and Sayyaadi [43] improved on the accuracy of the PSVL model [42], by coupling the polytropic heat losses from the expansion and compression spaces, to the energy balance equations of those spaces. Other studies deploying the second order model have been reported in the literature [44][45][46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

A new non-ideal second order thermal model with additional loss effects for simulating beta Stirling engines

Udeh

Michailos

Ingham

et al. 2020

Energy Conversion and Management

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In this paper, comprehensive governing differential equations of Stirling engines have been developed by coupling the effect of gas leakage through the displacer gap, gas leakage into the crank case and the shuttle loss rate into the traditional model. Instantaneous pressures and temperatures of the working fluid in the engine were evaluated at same time step.The present model was deployed for the thermal simulation of the GPU-3 Stirling engine and the obtained results were robustly compared to experimental data as well as results from previous numerical models. Then, parametric studies were conducted to assess the impact of geometrical and operating parameters on the performance of Stirling engines working with helium or hydrogen. Results suggest that the modifications made in this model led to better accuracy and consistency in predicting the experimental data of the prototype engine at all speeds, compared with most previous models. It was found that there exists a minimum dimensionless gap number, for every engine pressure below which mass leakage into the compression volume may not impact the brake power and energetic efficiency of the engine.In addition, an optimum mean effective pressure was found for maximum energetic efficiency of the engine. This optimum value is higher for helium gas than for hydrogen gas. Further results indicated that the brake power and energetic efficiency of the prototype Stirling engine can be significantly improved by 30% and 18%, respectively, provided that the heater temperature is raised to 850 ℃ while the cooler temperature is reduced to 0 ℃.

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“…The result showed that the maximum power output of the hybrid system was increased percentage in comparison with the stand‐alone Stirling engine system. Chahataghi et al 21 proposed using two beta‐type Stirling engines in a (CCHP). In addition to the Stirling engines, a single‐effect absorption chiller, a heat recovery system, and an electrical generator were added to the system.…”

Section: Introductionmentioning

confidence: 99%

A novel approach to improve the performance of solar‐driven Stirling engine using solar‐driven ejector cooling cycle

2020

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In this paper, a novel system to enhance the performance of a solar-driven finite speed alpha-type Stirling engine is proposed and evaluated. Part of the concentrated solar energy is used to drive an ejector refrigeration system. The cooling produced in the ejector cooling cycle is used to cool the Stirling engine to enhance its efficiency. Model equations to describe the systems are proposed and solved numerically. The results indicate that the new system produces averagely 3.3 times electrical power more than the conventional one. Moreover, the proposed system improves the Stirling engine efficiency by up to 46% in comparison with 19.15% for the conventional Stirling engine under solar radiation intensity of (1 kW/m 2). Also, the results showed that the solar radiation intensity and wind speed are the most influential parameters that affect the proposed system efficiency. The new system is recommended to use in desert climates where high average daily solar radiation intensity, low wind speeds, and water shortage exist. Economic analysis is carried out to determine the feasibility of the proposed system under different economic parameters. It is found that, for instance, the simple payback period is 4.64 years for the new system when the selling price of electricity is 0.35 $/kWh. K E Y W O R D S ejector cooling cycle, renewable energy, solar thermal utilization, Stirling engine 1 | INTRODUCTION Utilizing solar energy has become one of the priorities for many countries in the world because it is the key to energy security in the future. Unlike fossil fuels, solar energy is limitless and friendly to the environment. 1 The only challenge that faces us is to invite and develop new technologies that able to convert this free energy into useful forms of energy in a cost-efficient way. Over the last century, many solar energy systems were invented, manufactured, and developed, such as photovoltaic cells, solar collectors, solar desalination units, solar cooling cycles, and solar-driven Stirling engine. In 1819, Robert Stirling invited an engine that converts thermal energy into mechanical energy using a fixed amount of a compressible gas which compressed and expanded continuously in a closed cycle that is known later as Stirling

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Energy, exergy, environmental, and economic modeling of combined cooling, heating and power system with Stirling engine and absorption chiller

Cited by 65 publications

References 29 publications

Energy, exergy, economic, and environmental (4E) analyses and optimization of a CCHP system with steam turbine

Energy, exergy, economic, and environmental (4E) analyses and optimization of a CCHP system with steam turbine

A new non-ideal second order thermal model with additional loss effects for simulating beta Stirling engines

A novel approach to improve the performance of solar‐driven Stirling engine using solar‐driven ejector cooling cycle

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