Exergy, economic and environmental evaluation of an optimized hybrid photovoltaic-geothermal heat pump system

Kavian, Soheil; Aghanajafi, Cyrus; Mosleh, Hassan Jafari; Nazari, Arash; Nazari, Ashkan

doi:10.1016/j.apenergy.2020.115469

Cited by 82 publications

(16 citation statements)

References 48 publications

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“…The detailed expression of the computational algorithm and the numerical model of GSHX, which is Type 557a, is in the previous research. 14…”

Section: Heat Pump System Modelingmentioning

confidence: 99%

“…One of the most pivotal factors that affect the environment is irreversibility or destroyed exergy, which is calculated via Equation (35). 14…”

Section: Exergy Analysis Of the Systemmentioning

confidence: 99%

“…To analyze both energetic and economic aspects of the system concomitantly, the definition of levelized cost of energy (LCOE) can be used 14 :…”

Section: Economic Analysis Of the Systemmentioning

confidence: 99%

“…The irreversibility of every component can be obtained via the equations mentioned in Table 1 in the previous study. 14 In fact, the subtraction of the outlet exergy from the inlet exergy is equal to the irreversibility of the PVT collectors. The outlet exergy of the PVT system contains electrical, collector, and thermal exergy losses, and the input exergy includes the absorbed irradiance through the PVT surfaces.…”

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confidence: 99%

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Numerical simulation of geothermal‐PVT hybrid system with PCM storage tank

Kamazani

Aghanajafi

2021

Intl J of Energy Research

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As the increase in greenhouse emissions, climate changes, and other irreversible repercussions stems from environmentally destructive energies such as fossil fuels, exploiting solar and geothermal energy as unlimited clean sources of energy in the renewable energy technologies can survive the planet earth, which is facing a catastrophe on a global scale. The main purpose of this research is to study Techno analysis of the combined ground source heat pump (GSHP) and photovoltaic thermal collectors (PVTs) with a "phase-change material" (PCM) storage tank to fulfill the energy demands of a residential building. In the first step of this study, in order to model the heat pump behavior in multi-usage operation modes (heating and cooling), a numerical transient simulation of a water-to-water GSHP, which includes a vertical U-type ground source heat exchanger (GSHX) and a variable speed drive (VSD) compressor, was conducted by developing a numerical code in Engineering Equation Solver software. To study the thermodynamic aspect of the hybrid system in terms of exergy and energy, a transient numerical simulation was accomplished using the TRNSYS program. Also, the impact of effective characteristics of ingredients such as areas of PVT panels and the volume of the storage tank of PCMs on the performance of the hybrid system are investigated. On top of that, the two types of the GSHP-PVT-PCMs and GSHP-PV from the energy and exergy points of view are compared. The obtained results demonstrate that the irreversibility of the solar modules of the GSHP-PVT-PCMs is 6.6% lower than that of the GSHP-PV. Furthermore, the calculation of the annual required load of the building for these two kinds of hybrid systems shows that the use of collectors in this combined system has reduced the total load of the building by 6.5%. The use of collectors in the GSHP-PVT-PCM gives rise to a difference in the value of solar factor (SF) of this system by 1.4% more than the one for the hybrid system without thermal collectors.

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“…The detailed expression of the computational algorithm and the numerical model of GSHX, which is Type 557a, is in the previous research. 14…”

Section: Heat Pump System Modelingmentioning

confidence: 99%

“…One of the most pivotal factors that affect the environment is irreversibility or destroyed exergy, which is calculated via Equation (35). 14…”

Section: Exergy Analysis Of the Systemmentioning

confidence: 99%

“…To analyze both energetic and economic aspects of the system concomitantly, the definition of levelized cost of energy (LCOE) can be used 14 :…”

Section: Economic Analysis Of the Systemmentioning

confidence: 99%

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confidence: 99%

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Numerical simulation of geothermal‐PVT hybrid system with PCM storage tank

Kamazani

Aghanajafi

2021

Intl J of Energy Research

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“…In order to filter these changes, battery energy storage systems have been widely accepted as one of the potential solutions to shift the electrical load from peak hours to off-peak hours (Yang et al, 2018a;Wali et al, 2021). The idea of combining power generation cycle and HP cycle has been extensively studied, such as solar collector -HP (Trillat-Berdal et al, 2007), PV-HP (Kavian et al, 2020), HP-thermal energy storage (TES) (Renaldi et al, 2017), organic Rankine cycle (ORC) -HP water heaters (Liang et al, 2018). However, due to the large differences in local weather conditions, occupancy, energy prices, government subsidies and building types, this optimisation must be done for each component (Renaldi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Optimal Sizing of a Grid Independent Renewable Heating System for Building Decarbonisation

Chen

Friedrich

2021

Front. Energy Res.

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As the use of fossil fuels has led to global climate change due to global warming, most countries are aiming to reduce greenhouse gas emissions through the application of renewable energies. Due to the distributed and seasonal heating demand, the decarbonisation of heating is more challenging, especially for countries that are cold in winters. Electrically powered heat pumps are considered as an attractive solution for decarbonising heating sector. Since grid-powered heat pumps may significantly increase the power demand of the grid, this paper considers using local renewable energy to provide power for heat pumps, which is known as the grid independent renewable heating system including photovoltaic, wind turbine, battery storage system and thermal energy storage. This paper investigates a complete renewable heating system (RHS) framework and sizing the components to decarbonise building heating. The relationship between the reduction of gas consumption and the requirement of battery storage system (BSS) under the corresponding installation capacity of renewable components is analysed with their technical requirements. Then, according to different investment plans, this paper uses the particle swarm optimisation algorithm for optimal sizing of each component in the RHS to find a solution to minimise CO2 emissions. The results verify that the RHS with optimal sizing can minimise CO2 emissions and reduce the operational cost of natural gas. This work provides a feasible solution of how to invest the RHS to replace the existing heating system based on gas boilers and CHPs.

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Optimization of Photovoltaic Energy Systems for Residential Customers in Hot Climate Areas Based on Seasonal and Average Daily Load Profile

Zubair

Awan

2021

Energy Tech

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Fixed tilted, single‐axis tracking, and dual‐axis tracking PV systems are compared for one‐way energy meters and net‐energy meters. Optimization of the tilt angle and azimuth angle based on the load profile in one‐way energy meters enhances the net present value. The higher energy demands of summer can be met by lower tilt angles while the PV energy peak can be shifted towards the higher load hours by adjusting the azimuth angle. The results show that the net‐energy system with single‐axis tracking outperforms dual‐axis tracking and fixed tilted systems for a residential PV system one‐way meter, the load curve can be used to optimize the tilt angle and azimuth angle of a fixed tilted system to achieve a higher net present value (NPV) with added advantages of lower building cooling loads and lower self‐shading losses of the PV system. The comparison between the base‐case PV system and the optimized system of a fixed tilted system on a one‐way energy meter in Islamabad and Lahore shows a 15% and 13.7% higher NPV, 3.5%, and 3.6% lower simple payback period respectively. The optimized PV energy system also achieved 28% and 25% more savings in the cooling load of the houses in Islamabad and Lahore, respectively.

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Exergy, economic and environmental evaluation of an optimized hybrid photovoltaic-geothermal heat pump system

Cited by 82 publications

References 48 publications

Numerical simulation of geothermal‐PVT hybrid system with PCM storage tank

Numerical simulation of geothermal‐PVT hybrid system with PCM storage tank

Optimal Sizing of a Grid Independent Renewable Heating System for Building Decarbonisation

Optimization of Photovoltaic Energy Systems for Residential Customers in Hot Climate Areas Based on Seasonal and Average Daily Load Profile

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