The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Daan Six - One of the best experts on this subject based on the ideXlab platform.
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flexibility of a combined heat and power system with thermal energy Storage for district heating
Applied Energy, 2013Co-Authors: Thomas Nuytten, Bert Claessens, Kristof Paredis, Johan Van Bael, Daan SixAbstract:Abstract The trend towards an increased importance of distributed (renewable) energy resources characterized by intermittent operation redefines the energy landscape. The stochastic nature of the energy systems on the supply side requires increased flexibility at the demand side. We present a model that determines the theoretical maximum of flexibility of a combined heat and power system coupled to a thermal energy Storage Solution that can be either centralized or decentralized. Conventional central heating, to meet the heat demand at peak moments, is also available. The implications of both Storage concepts are evaluated in a reference district. The amount of flexibility created in the district heating system is determined by the approach of the system through delayed or forced operation mode. It is found that the distinction between the implementation of the thermal energy Storage as a central unit or as a collection of local units, has a dramatic effect on the amount of available flexibility.
Bahman Shabani - One of the best experts on this subject based on the ideXlab platform.
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hydrogen as a long term large scale energy Storage Solution to support renewables
Energies, 2018Co-Authors: Subodh Kharel, Bahman ShabaniAbstract:This paper presents a case study of using hydrogen for large-scale long-term Storage application to support the current electricity generation mix of South Australia state in Australia, which primarily includes gas, wind and solar. For this purpose two cases of battery energy Storage and hybrid battery-hydrogen Storage systems to support solar and wind energy inputs were compared from a techno-economical point of view. Hybrid battery-hydrogen Storage system was found to be more cost competitive with unit cost of electricity at $0.626/kWh (US dollar) compared to battery-only energy Storage systems with a $2.68/kWh unit cost of electricity. This research also found that the excess stored hydrogen can be further utilised to generate extra electricity. Further utilisation of generated electricity can be incorporated to meet the load demand by either decreasing the base load supply from gas in the present scenario or exporting it to neighbouring states to enhance economic viability of the system. The use of excess stored hydrogen to generate extra electricity further reduced the cost to $0.494/kWh.
Gregorio Levis - One of the best experts on this subject based on the ideXlab platform.
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hydrogen as a long term large scale energy Storage Solution when coupled with renewable energy sources or grids with dynamic electricity pricing schemes
International Journal of Hydrogen Energy, 2020Co-Authors: Ahmad Mayyas, Max Wei, Gregorio LevisAbstract:Abstract One of the key challenges that still facing the adoption of renewable energy systems is having a powerful energy Storage system (ESS) that can store energy at peak production periods and return it back when the demand exceeds the supply. In this paper, we discuss the costs associated with storing excess energy from power grids in the form of hydrogen using proton exchange membrane (PEM) reversible fuel cells (RFC). The PEM-RFC system is designed to have dual functions: (1) to use electricity from the wholesale electricity market when the wholesale price reaches low competitive values, use it to produce hydrogen and then convert it back to electricity when the prices are competitive, and (2) to produce hydrogen at low costs to be used in other applications such as a fuel for fuel cell electric vehicles. The main goal of the model is to minimize the levelized cost of energy Storage (LCOS), thus the LCOS is used as the key measure for evaluating this economic point. LCOS in many regions in United States can reach competitive costs, for example lowest LCOS can reach 16.4¢/kWh in Illinois (MISO trading hub) when the threshold wholesale electricity price is set at $25/MWh, and 19.9¢/kWh in Texas (ERCOT trading hub) at threshold price of $20/MWh. Similarly, the levelized cost of hydrogen production shows that hydrogen can be produced at very competitive costs, for example the levelized cost of hydrogen production can reach $2.54/kg-H2 when using electricity from MISO hub. This value is close to the target set by the U.S. Department of Energy.
Thomas Nuytten - One of the best experts on this subject based on the ideXlab platform.
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flexibility of a combined heat and power system with thermal energy Storage for district heating
Applied Energy, 2013Co-Authors: Thomas Nuytten, Bert Claessens, Kristof Paredis, Johan Van Bael, Daan SixAbstract:Abstract The trend towards an increased importance of distributed (renewable) energy resources characterized by intermittent operation redefines the energy landscape. The stochastic nature of the energy systems on the supply side requires increased flexibility at the demand side. We present a model that determines the theoretical maximum of flexibility of a combined heat and power system coupled to a thermal energy Storage Solution that can be either centralized or decentralized. Conventional central heating, to meet the heat demand at peak moments, is also available. The implications of both Storage concepts are evaluated in a reference district. The amount of flexibility created in the district heating system is determined by the approach of the system through delayed or forced operation mode. It is found that the distinction between the implementation of the thermal energy Storage as a central unit or as a collection of local units, has a dramatic effect on the amount of available flexibility.
Subodh Kharel - One of the best experts on this subject based on the ideXlab platform.
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hydrogen as a long term large scale energy Storage Solution to support renewables
Energies, 2018Co-Authors: Subodh Kharel, Bahman ShabaniAbstract:This paper presents a case study of using hydrogen for large-scale long-term Storage application to support the current electricity generation mix of South Australia state in Australia, which primarily includes gas, wind and solar. For this purpose two cases of battery energy Storage and hybrid battery-hydrogen Storage systems to support solar and wind energy inputs were compared from a techno-economical point of view. Hybrid battery-hydrogen Storage system was found to be more cost competitive with unit cost of electricity at $0.626/kWh (US dollar) compared to battery-only energy Storage systems with a $2.68/kWh unit cost of electricity. This research also found that the excess stored hydrogen can be further utilised to generate extra electricity. Further utilisation of generated electricity can be incorporated to meet the load demand by either decreasing the base load supply from gas in the present scenario or exporting it to neighbouring states to enhance economic viability of the system. The use of excess stored hydrogen to generate extra electricity further reduced the cost to $0.494/kWh.
