scholarly journals Modeling On-Site Combined Heat and Power Systems Coupled to Main Process Operation

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 218 ◽  
Author(s):  
Cristian Pablos ◽  
Alejandro Merino ◽  
Luis Felipe Acebes
Keyword(s):  
Power Systems ◽  
Electricity Generation ◽  
Optimization Problem ◽  
Combined Heat And Power ◽  
Main Process ◽  
Operational Cost ◽  
System Behavior ◽  
Dynamic Optimization Problem ◽  
Process Operation ◽  
Plant Configuration

Many production processes work with on-site Combined Heat and Power (CHP) systems to reduce their operational cost and improve their incomes by selling electricity to the external grid. Optimal management of these plants is key in order to take full advantage of the possibilities offered by the different electricity purchase or selling options. Traditionally, this problem is not considered for small cogeneration systems whose electricity generation cannot be decided independently from the main process production rate. In this work, a non-linear gray-box model is proposed in order to deal with this dynamic optimization problem in a simulated sugar factory. The validation shows that with only 52 equations, the whole system behavior is represented correctly and, due to its structure and small size, it can be adapted to any other production process working along a CHP with the same plant configuration.

scholarly journals Power Points

2007 ◽  
Vol 129 (08) ◽  
pp. 22-24
Author(s):  
Jeffrey Winters
Keyword(s):  
Energy Storage ◽  
Power Systems ◽  
Electric Vehicles ◽  
Electricity Generation ◽  
Lithium Ion ◽  
Combined Heat And Power ◽  
Power Supplies ◽  
Solar Panels ◽  
Uninterruptible Power Supplies ◽  
Uninterruptible Power

This article discusses various aspects of nanoscale materials that are seen to revolutionize energy storage. Teams of researchers working around the globe are finding that as the materials in batteries and capacitors become more finely engineered, they increase their energy storage capabilities. Within a decade, nanomaterial-based batteries and capacitors could find themselves not just in power tools and cell phones, but in uninterruptible power supplies, electric vehicles, and even the electric grid, to help handle wind and solar energy. The new lithium-ion battery relies on nanoparticles in its electrolyte to provide greater energy density and longer cycle life than conventional batteries. As batteries are playing such a prominent role, researchers are working hard to improve them, eliminating such headaches as recharge memory and packing more energy into each cubic inch. Studies show that distributed electricity generation from solar panels or combined heat and power systems could be backed up with a refrigerator-size capacitor unit that could store excess energy. The promise of nanotechnology-enhanced energy storage is enough to make anyone see a limitless future. A123’s Fulop cautions that nano-based storage systems ought to be looked at with optimism tempered by caution.

scholarly journals Complementarity between Combined Heat and Power Systems, Solar PV and Hydropower at a District Level: Sensitivity to Climate Characteristics along an Alpine Transect

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4156 ◽  
Author(s):  
Handriyanti Diah Puspitarini ◽  
Baptiste François ◽  
Marco Baratieri ◽  
Casey Brown ◽  
Mattia Zaramella ◽  
...  
Keyword(s):  
Power Systems ◽  
Electricity Generation ◽  
Combined Heat And Power ◽  
District Level ◽  
Energy Sources ◽  
Seasonal Temperature ◽  
Generation Process ◽  
Solar Photovoltaic ◽  
Solar Pv ◽  
Heat Demand

Combined heat and power systems (CHP) produce heat and electricity simultaneously. Their resulting high efficiency makes them more attractive from the energy managers’ perspective than other conventional thermal systems. Although heat is a by-product of the electricity generation process, system operators usually operate CHP systems to satisfy heat demand. Electricity generation from CHP is thus driven by the heat demand, which follows the variability of seasonal temperature, and thus is not always correlated with the fluctuation of electricity demand. Consequently, from the perspective of the electricity grid operator, CHP systems can be seen as a non-controllable energy source similar to other renewable energy sources such as solar, wind or hydro. In this study, we investigate how ‘non-controllable’ electricity generation from CHP systems combines with ‘non-controllable’ electricity generation from solar photovoltaic panels (PV) and run-of-the river (RoR) hydropower at a district level. Only these three energy sources are considered within a 100% renewable mix scenario. Energy mixes with different shares of CHP, solar and RoR are evaluated regarding their contribution to total energy supply and their capacity to reduce generation variability. This analysis is carried out over an ensemble of seventeen catchments in North Eastern Italy located along a climate transect ranging from high elevation and snow dominated head-water catchments to rain-fed and wet basins at lower elevations. Results show that at a district scale, integration of CHP systems with solar photovoltaic and RoR hydropower leads to higher demand satisfaction and lower variability of the electricity balance. Results also show that including CHP in the energy mix modifies the optimal relative share between solar and RoR power generation. Results are consistent across the climate transect. For some districts, using the electricity from CHP might also be a better solution than building energy storage for solar PV.

Fuel Optimization for Power, Heat and CHP Systems Including Emissions Regulations and Ambient Conditions

2005 ◽  
Author(s):  
Manuel-Angel Gonzalez-Chapa ◽  
Jose-Ramon Vega-Galaz
Keyword(s):  
Power Systems ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Fossil Fuel ◽  
Good Practice ◽  
Combined Heat And Power ◽  
Ambient Conditions ◽  
Gas Emissions ◽  
The World ◽  
Fuel Optimization

Combined Heat and Power systems have been used all around the world due to their effective and viable way of transforming energy from fossil fuel. Indeed, the advantage of lower greenhouse gas emissions compared to those obtained in conventional power or conventional heat generation systems have been an important factor giving CHP systems an advantage over these conventional ones. Certainly CHP has been, and continues to be, a good practice while renewable technologies become more economically. While these technologies emerge it is important to continue minimizing these greenhouse gas emissions from conventional and CHP units as much as possible. This paper deals with the fuel optimization of power, heat and CHP systems including emissions and ambient conditions constraints. Ambient conditions variations are evaluated before solving the optimization and then introduced to the problem to consider their effects.

Energy management of renewable energy-based combined heat and power systems: A review

2022 ◽  
Vol 51 ◽  
pp. 101944
Author(s):  
Oon Erixno ◽  
Nasrudin Abd Rahim ◽  
Farah Ramadhani ◽  
Noriah Nor Adzman
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Energy Management ◽  
Combined Heat And Power

scholarly journals Optimal robust operation of combined heat and power systems with demand response programs

2019 ◽  
Vol 149 ◽  
pp. 1359-1369 ◽  
Author(s):  
Majid Majidi ◽  
Behnam Mohammadi-Ivatloo ◽  
Amjad Anvari-Moghaddam
Keyword(s):  
Power Systems ◽  
Demand Response ◽  
Combined Heat And Power ◽  
Demand Response Programs

Real-time price-based demand response model for combined heat and power systems

Energy ◽  
2019 ◽  
Vol 168 ◽  
pp. 1119-1127 ◽  
Author(s):  
Manijeh Alipour ◽  
Kazem Zare ◽  
Heresh Seyedi ◽  
Mehdi Jalali
Keyword(s):  
Power Systems ◽  
Real Time ◽  
Demand Response ◽  
Combined Heat And Power ◽  
Response Model ◽  
Time Price

scholarly journals Current status of fuel cell based combined heat and power systems for residential sector

2015 ◽  
Vol 293 ◽  
pp. 312-328 ◽  
Author(s):  
Harikishan R. Ellamla ◽  
Iain Staffell ◽  
Piotr Bujlo ◽  
Bruno G. Pollet ◽  
Sivakumar Pasupathi
Keyword(s):  
Fuel Cell ◽  
Power Systems ◽  
Combined Heat And Power ◽  
Current Status ◽  
Residential Sector
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