Dual Power Generation Research Articles

Energetic/economic/scalability assessment of active solar energy and waste heat utilization in urban environments for H2/freshwater production: A CSP-centered multigeneration system with dual-loop power generation

The imperative to reduce greenhouse gas emissions has intensified the need for sustainable thermal energy systems. This study addresses this exigency by harnessing solar energy and exploiting waste heat to augment energy efficiency in urban settings. The proposed system integrates a concentrated solar power-based Brayton cycle with dual power generation, water desalination, and hydrogen production capabilities. Comprehensive technical and economic evaluations affirm the feasibility of this system. Additionally, transient codes have been utilized to ascertain the performance of the proposed configuration. The investigation reveals that the tower and receiver are the primary sites of exergy destruction, accounting for 48.1 % of the total, with the heliostat field, reverse osmosis, and proton exchange membrane electrolysis contributing 24 %, 8.8 %, and 6.9 %, respectively. The findings show that increasing the pressure ratio in the Brayton cycle leads to improved exergy efficiency and increased power output, but also leads to higher overall costs. A thorough economic evaluation shows that the solar unit, which includes the receiver, heliostat field, compressor, and gas turbine, is the main factor influencing costs, representing 62.6 % of the total system cost rate. The dynamic study conducted to forecast the annual system capacity in San Francisco indicates that electricity production peaks during summer at 242.15 MWh. Conversely, winter exhibits the lowest contribution at 17.3 % with 143.11 MWh.

Dual power generation modes for thermally regenerative electrochemical cycle integrated with concentrated thermal photovoltaic and phase change material storage

A dual power stroke system that generates electricity during the day and night is proposed. The model consists of concentrated thermal photovoltaic (CPV/T), thermally regenerative electrochemical cycle (TREC), and phase change material (PCM) storage. During the daytime, the concentrated thermal photovoltaic generates electricity directly and supplies hot water to raise the charging temperature of the thermally regenerative electrochemical cycle. To reduce the discharging temperature of the thermally regenerative electrochemical cycle and to avoid losing heat to the environment, a phase change material storage is used to store the heat. During the nighttime, the stored heat in the storage is used back to raise the charging temperature of the regenerative cycle. The discharging temperature is reduced using a finned heat sink. Raising the charging temperature of the regenerative cycle and reducing the discharging temperature will generate electricity during the day and night. An analytical model is developed and validated to investigate the effect of different parameters like solar radiation intensity, water mass flow rate, and temperature in the concentrated thermal photovoltaic and ambient temperature on efficiency and the power produced. The solar radiation, water inlet temperature, and mass flow rate impact the system's performance during the daytime. The ambient temperature is a primary influencer during the nighttime. The efficiency of the regenerative cycle and photovoltaic cells can reach 7.11 % and 15.74 % during the daytime. During the nighttime, the regenerative cycle is the only source of electricity and has an efficiency of up to 6.13 %. Using the proposed model presents a powerful solution for the energy problem in remote areas during the day and night times.

Dual Power Generation from Solar Energy and Wind Energy

Now days, for the human being electricity is most facility. All the conventional energy resources are depleting day by day. So we have to shift from conventional to non-conventional energy resources. In this the mixture of two energy resources happens for example wind and solar energy. This process reveals the sustainable energy resources without causing any harm to the nature. By using dual energy system, we can give uninterrupted power. Essentially this system includes the incorporation of two energy system that will provide constant power. Wind turbines are used for converting wind energy and Solar panels are used for converting solar energy and into electricity. This electrical power can be utilized for various purposes. Generation of electricity will be happens at moderate expense. This paper bring about the generation of electricity by utilizing two sources combine which prompts create electricity with affordable cost without harming the nature balance. Keywords: LPSP, solar panels, wind/solar system

Design and Development of Dual Power Generation Solar and Windmill Generator

The fast depletion of conventional energy resources and the issue of global warming have encouraged researchers worldwide to come up with the best energy solution. Renewable energy resources such as wind and solar energy have been widely adopted as an alternative source of energy. In this work, an integrated solar and wind energy system were implemented aiming to produce the maximum possible output power from the available renewable energy resources such as solar irradiance and wind energy. The proposed system comprised two solar modules and horizontally rotating wind blades. An energy storage system plus a charge controller were also used aiming to improve the overall energy conversion efficiency. The results showed that this system demonstrated superior performance compared with the solar modules and wind system when they had worked individually. The proposed system was generating an average energy of 61.729 Wh daily. Therefore, it was estimated that the system can generate an annual output power of about 207.4 kWh. During the conducted experiments, the solar panels worked as the main source of the generated energy while the wind system acted as a secondary source of energy during the solar absent times. Moreover, the safety factor was calculated to be within the limits of 2 that shows the proposed system can work according to the industrial safety limits of Malaysia.

Prospects of binary energy generation systems based on the joint use of traditional sources of energy and wave motion energy

Electricity consumption of offshore oil and gas drilling platforms is usually provided by gas generator installations. However, such installations are expensive in operation and emit significant amounts of carbon dioxide and nitrogen oxides. Electricity consumption from the main grid is the best option, but expensive for platforms located far from the coast and with limited environmental benefits, if not supported by environmentally friendly production. Offshore wave energy technology, which is currently being developed for deep-water areas, can be connected directly to the platforms and work in parallel with gas turbines. Wave power station will save fuel and reduce carbon dioxide emissions, while there is no need for a long and expensive connection to the coastal grids. Operational strategies and fuel savings and emissions, depending on the size of the wind farm, are quantified by the example of the offshore oil and gas platform in the Far East shelf. In this paper, an assessment is made of the prospects of using the approach of dual power generation systems, which in turn will provide a significant reduction in fuel consumption and emissions, especially if we consider starting and stopping gas turbines. The main task is to find the optimal work strategy that balances the number of starts and stops of gas turbines with dissipative energy and fuel economy.

Evaluation of the performance of combined cooling, heating, and power systems with dual power generation units

The benefits of using a combined cooling, heating, and power system with dual power generation units (D-CCHP) is examined in nine different U.S. locations. One power generation unit (PGU) is operated at base load while the other is operated following the electric load. The waste heat from both PGUs is used for heating and for cooling via an absorption chiller. The D-CCHP configuration is studied for a restaurant benchmark building, and its performance is quantified in terms of operational cost, primary energy consumption (PEC), and carbon dioxide emissions (CDE). Cost spark spread, PEC spark spread, and CDE spark spread are examined as performance indicators for the D-CCHP system. D-CCHP system performance correlates well with spark spreads, with higher spark spreads signifying greater savings through implementation of a D-CCHP system. A new parameter, thermal difference, is introduced to investigate the relative performance of a D-CCHP system compared to a dual PGU combined heat and power system (D-CHP). Thermal difference, together with spark spread, can explain the variation in savings of a D-CCHP system over a D-CHP system for each location. The effect of carbon credits on operational cost savings with respect to the reference case is shown for selected locations.

Combined heat and power systems with dual power generation units and thermal storage

The objective of this paper is to study the performance of a combined heat and power (CHP) system that uses two power generation units (PGU). In addition, the effect of thermal energy storage is evaluated for the proposed dual-PGU CHP configuration (D-CHP). Two scenarios are evaluated in this paper. In the first scenario, one PGU operates at base-loading condition, while the second PGU operates following the electric load. In the second scenario, one PGU operates at base-loading condition, while the second PGU operates following the thermal load. The D-CHP system is modeled for the same building in four different locations to account for variation of the electric and thermal loads due to weather data. The D-CHP system results are compared with the reference building by using conventional technology to determine the benefits of this proposed system in terms of operational cost and carbon dioxide emissions. The D-CHP system results, with and without thermal storage, are also compared with that of single-PGU CHP systems operating following the electric load (FEL), following the thermal load (FTL), and base-loaded (BL). Results indicate that the D-CHP system operating either FEL or FTL in general provides better results than a single-PGU CHP system operating FEL, FTL, or BL. The addition of thermal storage enhances the potential benefits from D-CHP system operation in terms of operational cost savings and emissions savings. Copyright © 2013 John Wiley & Sons, Ltd.

Evaluation of combined heat and power (CHP) systems performance with dual power generation units for different building configurations

SUMMARY This paper evaluates the economic, energetic, and environmental feasibility of using two power generation units (PGUs) to operate a combined heat and power (CHP) system. Several benchmark buildings developed by the Department of Energy simulated using the weather data for Chicago, IL, are used to analyze the proposed configuration. This location has been selected because it usually provides favorable CHP system conditions in terms of cost and emission reduction. For the proposed configuration, one PGU is operated at base load to satisfy part of the electricity building requirements, whereas the other is used to satisfy the remaining electricity requirement operating following the electric load. The dual-PGU CHP configuration (D-CHP) is modeled for four different scenarios to determine the optimum operating range for the selected benchmark buildings. The dual-PGU scenario is compared with the reference building using conventional technology to determine the benefits of this proposed system in terms of operational cost, primary energy reduction, and carbon dioxide emissions. The D-CHP system results are also compared with a CHP system operating following the electric load (FEL) and base-loaded CHP system. For three of the selected buildings, the proposed D-CHP system provides comparable or greater savings in operating cost, primary energy consumption, and carbon dioxide emissions than the optimized conditions for base loading and FEL. In addition, the effect of operating the D-CHP system only during certain months of the year on the overall operational cost is also evaluated. Results indicate that not operating the D-CHP system for the months where the thermal load is too low is beneficial for the overall system performance. Copyright © 2012 John Wiley & Sons, Ltd.