Energy-Saving Evaluation of SOFC Cogeneration Systems With Solar Cell and Battery

2014 ◽  
Vol 11 (6) ◽  
Author(s):  
Akira Yoshida ◽  
Koichi Ito ◽  
Yoshiharu Amano
Keyword(s):  
Solar Cell ◽  
Energy Saving ◽  
Energy Supply ◽  
Energy Savings ◽  
Optimization Theory ◽  
Maximum Energy ◽  
Planning Problem ◽  
Energy Supply System ◽  
Energy Demands ◽  
Cogeneration System

The purpose of this study is to evaluate the maximum energy-saving potential of residential energy supply systems consisting of a solid oxide fuel cell (SOFC) cogeneration system (CGS) combined with a solar cell (SC) and a battery (BT), compared with a reference system (RS). This study applies an optimization theory into an operational planning problem to measure actual energy demands over the course of 1 year. Eight different types of energy supply system were compared with each other by changing the components of the SOFC-CGS, SC, BT, and RS. Meaningful numerical results are obtained, indicating the maximum potential energy savings.

Energy consumption optimization for AC drives position control

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Branislav Ftorek ◽  
Milan Saga ◽  
Pavol Orsansky ◽  
Jan Vittek ◽  
Peter Butko
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Energy Savings ◽  
Position Control ◽  
Control Strategies ◽  
Content Type ◽  
Ac Drives ◽  
Energy Demands ◽  
Wide Range ◽  
Energy Consumption Optimization

Purpose The main purpose of this paper is to evaluate the two energy saving position control strategies for AC drives valid for a wide range of boundary conditions including an analysis of their energy expenses. Design/methodology/approach For energy demands analysis, the optimal energy control based on mechanical and electrical losses minimization is compared with the near-optimal one based on symmetrical trapezoidal speed profile. Both control strategies respect prescribed maneuver time and define acceleration profile for preplanned rest-to-rest maneuver. Findings Presented simulations confirm lower total energy expenditures of energy optimal control if compared with near-optimal one, but the differences are only small due to the fact that two energy saving strategies are compared. Research limitations/implications Developed overall control system consisting of energy saving profile generator, pre-compensator and position control system respecting principles of field-oriented control is capable to track precomputed state variables precisely. Practical implications Energy demands of both control strategies are verified and compared to simulations and preliminary experiments. The possibilities of energy savings were confirmed for both control strategies. Originality/value Experimental verification of designed control structure is sufficiently promising and confirmed assumed energy savings.

Parametric Study on Economic Feasibility of Microturbine Cogeneration Systems by an Optimization Approach

2005 ◽  
Vol 127 (2) ◽  
pp. 389-396 ◽  
Author(s):  
Satoshi Gamou ◽  
Ryohei Yokoyama ◽  
Koichi Ito
Keyword(s):  
Energy Demand ◽  
Unit Cost ◽  
Maximum Energy ◽  
Optimal Number ◽  
Economic Feasibility ◽  
Optimization Approach ◽  
Energy Demands ◽  
Equation Problem ◽  
Numerical Studies ◽  
Cogeneration System

Economic feasibility of microturbine cogeneration systems is investigated by analyzing relationships between the optimal number of microturbine units and the maximum energy demands under various conditions. For this purpose, a method to obtain the maximum energy demand at which the optimal number changes is proposed by combining a nonlinear equation problem and an optimal unit sizing problem hierarchically. Based on the proposed method, a map expressing the aforementioned relationships can be illustrated. Through numerical studies carried out on systems installed in hotels by changing the electrical generating efficiency and the capital unit cost of the microturbine cogeneration unit as parameters, the influence of the parameters on the economic feasibility of the microturbine cogeneration system is clarified.

Multiobjective Robust Optimal Design of a Gas Turbine Cogeneration Plant Under Uncertain Energy Demands

2001 ◽  
Author(s):  
Ryohei Yokoyama ◽  
Koichi Ito
Keyword(s):  
Optimal Design ◽  
Energy Saving ◽  
Gas Turbine ◽  
Energy Supply ◽  
Design Method ◽  
Primary Energy ◽  
Weighted Sum ◽  
Cogeneration Plant ◽  
Energy Demands ◽  
Robust Optimal Design

A multiobjective robust optimal design method based on the minimax regret criterion is proposed for sizing equipment of energy supply plants so that they are robust in economic and energy saving characteristics under uncertain energy demands. Equipment capacities and utility contract demands as well as energy flow rates are determined to minimize a weighted sum of the maximum regrets in the annual total cost and primary energy consumption, and satisfy all the possible energy demands. This optimization problem is formulated as a kind of multilevel linear programming one, and its solution is derived by repeatedly evaluating lower and upper bounds for the optimal value of the weighted sum of the maximum regrets. Through a case study on a gas turbine cogeneration plant for district energy supply, the trade-off relationship between the robustness in economic and energy saving characteristics is clarified.

413 Optimal Operation of an Energy Supply System Based on Prediction of Energy Demands

2006 ◽  
Vol 2006.16 (0) ◽  
pp. 344-347
Author(s):  
Ryohei Yokoyama ◽  
Kenichi Shimizu ◽  
Tetsuya Wakui ◽  
Koichi Ito ◽  
Kazuyuki Kamimura ◽  
...  
Keyword(s):  
Energy Supply ◽  
Optimal Operation ◽  
Supply System ◽  
Energy Supply System ◽  
Energy Demands

scholarly journals Analysis of the energy-saving potential for heating of double skin glass-glass façades

2020 ◽  
Author(s):  
Víctor Diez-Martínez ◽  
Roberto Getino-de-la-Mano ◽  
José Luis Falagán-Cavero ◽  
David Borge-Diez
Keyword(s):  
Energy Saving ◽  
Linear Relationship ◽  
Energy Savings ◽  
Heated Surface ◽  
Maximum Energy ◽  
Solar Irradiation ◽  
Outdoor Temperature ◽  
Annual Average ◽  
Energy Flows ◽  
Double Skin

The energy flows of the double skin, glass-glass façades have been analysed, establishing a mathematical model to determine the energy savings provided by this construction solution in 10 cities in Spain. It has been found that the two climatological variables that most influence energy savings are outdoor temperature, as it is directly related to the demand for heating, and solar irradiation, as it is the source of energy from which savings are extracted. Energy savings in winter vary between 11.1% and 20.5%, depending on the weather. A linear relationship between the annual average outdoor temperature and the useful energy provided by the double- skin façade has been determined. It was verified that the maximum energy saving occurs when the façade is offset a few degrees to the east from the pure south orientation. It deviates further east, the higher the annual average temperature. A linear relationship has been established between the outside temperature and the azimuth of the façade with which the maximum energy saving occurs. To obtain savings percentages greater than 20%, the ratio between the double-skin façade surface and the total heated surface of the building must be less than 7.

scholarly journals Penghematan Listrik Rumah Tangga dalam Menunjang Kestabilan Energi Nasional dan Kelestarian Lingkungan

2019 ◽  
Vol 20 (2) ◽  
pp. 263
Author(s):  
Arif Dwi Santoso ◽  
Muhammad Agus Salim
Keyword(s):  
Energy Saving ◽  
Energy Supply ◽  
Energy Savings ◽  
Electricity Consumption ◽  
Electrical Energy ◽  
Research Data ◽  
Electricity Supply ◽  
Air Conditioners ◽  
Great Saving ◽  
Electrical Devices

ABSTRACTThe government efforts to maintain national energy stability program through the increase energy supply and saving must be supported by all levels of society. Several energy observers and experts stated that the contribution of the domestic or household sector in the activities of energy saving program is quite significant because the percentage of household customers are relatively high. This paper analyzes the potential of providing research data on the percentage of electricity savings in the domestic or household sectors towards saving electricity nationally. The results of the study show that electrical devices commonly used in households still have the potential to be saved. Electrical devices that are often used at households and have great saving potentials are air conditioners and refrigerators. If each household customer saves 30% of electricity consumption, then the national electricity supply that can be saved will be around 5,679 GW, equivalent to 83.3 trillion rupiah. The saving program resulted in savings of electricity consumption of around 6% of all household consumers or around 2.9% of total national electricity consumption.Keywords: electrical energy, savings, households ABSTRAKUpaya pemerintah dalam menjaga kestabilan energi nasional melalui program peningkatan pasokan dan penghematan energi harus didukung oleh seluruh lapisan masyarakat. Para pengamat dan pakar energi menyatakan bahwa kontribusi sektor domestik atau rumah tangga dalam program penghematan konsumsi energi listrik cukup signifikan karena persentase jumlah pelanggan rumah tangga yang relatif tinggi. Penelitian ini menganalisis tentang potensi persentase penghematan energi listrik sektor domestik atau rumah tangga terhadap  penghematan listrik secara nasional. Hasil penelitian menunjukkan bahwa piranti listrik yang biasa digunakan pada rumah tangga masih memiliki potensi untuk dilakukan penghematan. Piranti listrik yang sering digunakan pada rumah tangga dan memiliki potensi penghematan yang besar adalah alat pendingin ruangan (AC) dan kulkas. Bila setiap pelanggan rumah tangga melakukan penghematan konsumsi energi listriknya sebesar 30%, maka pasokan listrik nasional yang dapat dihemat adalah sekitar 5.679 GW atau setara dengan 83,3 Trilyun rupiah. Upaya ini menghasilkan penghematan konsumsi listrik sekitar 6% dari seluruh konsumen rumah tangga atau sekitar 2,9 % dari total konsumsi energi listrik nasional.Kata kunci: energi listrik, penghematan, rumah tangga

Analysis of Heat Processes in the Energy Supply System of a Gas-Using Feed Boiler

2020 ◽  
Vol 67 (1) ◽  
pp. 71-77
Author(s):  
Anatoliy M. Shuvalov ◽  
Aleksey N. Mashkov ◽  
Dmitriy A. Tikhomirov
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Power Supply ◽  
Energy Efficient ◽  
Energy Supply ◽  
Power Supply System ◽  
Energy Savings ◽  
Self Regulation ◽  
Supply System ◽  
Energy Supply System

The energy audit conducted on the use of fuel and energy resources in agriculture in the Tambov region showed that energy costs in the cost of production of agricultural products, depending on the type of products produced (milk, meat, vegetables grown in greenhouses, etc.) and their production technology, reach 15-50 percent. On large livestock farms, forage shops and inter-district feed mills are being built for the feed production. Gas-fired cooking cauldrons of low capacity (of 40-250 kilogram per hour) are mainly used for small and private farms. Analysis of low-power cooking boilers has shown that it is possible to improve their energy supply system by applying a method of regulating gas in proportion to the consumed heat flow. Energy savings can reach 40-50 percent. (Research purpose) The research purpose is in designing an equation system for mathematical description of the heat and energy balance of a gas-using cauldron with self-regulation of power to identify energy-efficient modes of its operation. (Materials and methods) Methods of system analysis and synthesis has been used. of knowledge existing in the field of ongoing research on the development of a gas-using digester with self-regulation of power. The methods are based on the theory of heat and mass transfer. (Results and discussion) The article presents a theoretical analysis of heat and power processes occurring in the power supply system of a cauldron with self-regulating power. The authors have designed a heat balance equation describing the processes of heat and mass transfer in a cauldron to identify effective modes of operation of such a power supply system. The article presents derived formulas for determining the useful heat for heating the product in the cauldron, heat loss for heating metal structures, from the enclosing structures to the environment, with outgoing exhaust gases, and from chemical underburning. (Conclusions) The article presents a system of equations that allows to mathematically describe the processes of heat and mass transfer in a gas-using cauldron with self-regulation of power to identify the most energy-efficient modes of its operation. It was found that by improving the power supply system of cauldron by applying a method of regulating gas in proportion to the consumed heat flow, it is possible to achieve energy savings of up to 40-50 percent.

Energy Savings Opportunities of an Integrated Facility and Production Line

2013 ◽  
Author(s):  
Michael P. Brundage ◽  
Qing Chang ◽  
Dongmei Chen ◽  
Victor Yu
Keyword(s):  
Energy Saving ◽  
Production Line ◽  
Energy Demand ◽  
Energy Savings ◽  
Cost Savings ◽  
Maximum Energy ◽  
Manufacturing Plant ◽  
Hvac System ◽  
Modern Manufacturing ◽  
Integrated Facility

In modern manufacturing facilities there are many energy saving opportunities (ESO) that are wasted by the lack of integration between the facility and the production system. This paper deals with an integrated production line and the heating, ventilation, and air conditioning (HVAC) system and explores the different energy saving opportunities of the two largest energy consumers in the manufacturing plant. The energy opportunity window of each machine is utilized to allow for energy savings for the production line without throughput loss on the floor. This opportunity window is synced with the peak periods of energy demand for the energy demand of the HVAC system. The integration of these two systems allows for the maximum energy cost savings. These systems are modeled and tested using simulation case studies.

Techno-Economic Evaluation of a Tri-Generation Energy Supply System for a Non-Interconnected Island Using Single-Shaft Gas-Turbine

2010 ◽  
Author(s):  
A. L. Polyzakis ◽  
A. K. Malkogianni
Keyword(s):  
Gas Turbine ◽  
Energy Supply ◽  
Net Present Value ◽  
Cooling System ◽  
Evaluation Methodology ◽  
Prime Mover ◽  
Energy Supply System ◽  
Fuel Prices ◽  
Energy Demands ◽  
Absorption Cooling System

In this paper, is presented a realistic simulation of the techno-economic performance of a tri-generation power plant, helping the potential investor to evaluate the profits of his future investment. The paper includes an overall techno-economic analysis including the following steps: Firstly, the research concerns the energy demands of an energy autonomous island. The second part, deals with the prime mover (namely the Gas Turbine, GT) modeling and simulation. The technical part of the assessment includes the Design Point (DP) and Off-Design (OD) analysis of the GT. The third part includes the simulation of the absorption cooling system alone and/or in cooperation with the prime mover. Finally, an evaluation methodology of tri-generation plants is introduced taking into account, both technical facts and economic data helping the potential users to decide whether it is profitable to use such technology or not. The economic scene will include the basic economic facts such as initial cost, handling and operational cost (fuel prices, maintenance etc), using methodology based on Net Present Value (NPV). The results are valuated using suitable sensitivity analysis. The results of the analysis generally shown, that the tri-generation plant is more profitable than the conventional way of energy supply.

Parametric Study on Economic Feasibility of Microturbine Cogeneration Systems by an Optimization Approach

2003 ◽  
Author(s):  
Satoshi Gamou ◽  
Koichi Ito ◽  
Ryohei Yokoyama
Keyword(s):  
Energy Demand ◽  
Unit Cost ◽  
Maximum Energy ◽  
Optimal Number ◽  
Economic Feasibility ◽  
Optimization Approach ◽  
Energy Demands ◽  
Equation Problem ◽  
Non Linear Equation ◽  
Cogeneration System

Economic feasibility of microturbine cogeneration systems is investigated by analyzing relationships between the optimal number of microturbine units and the maximum energy demands under various conditions. For this purpose, a method to obtain the maximum energy demand at which the optimal number changes is proposed by combining a non-linear equation problem and an optimal unit sizing problem hierarchically. Based on the proposed method, a map expressing the aforementioned relationships can be illustrated. Through numerical studies carried out on systems installed in hotels by changing the electrical generating efficiency and the capital unit cost of the microturbine cogeneration unit as parameters, the influence of the parameters on the economic feasibility of the microturbine cogeneration system is clarified.

Sign in / Sign up

Export Citation Format

Share Document