scholarly journals The application of the TES technology in CHP heating system with Chinese demand profiles——A techno-economic feasibility case study

2019 ◽  
Vol 111 ◽  
pp. 06010
Author(s):  
Ruoyu Zhang ◽  
Haichao Wang ◽  
Xiaozhou Wu ◽  
Xiangli Li ◽  
Lin Duanmu
Keyword(s):  
Mathematical Model ◽  
Heating System ◽  
Combined Heat And Power ◽  
Economic Benefits ◽  
Economic Feasibility ◽  
Electricity Pricing ◽  
Peak Shaving ◽  
Optimum Type ◽  
Chp System

The thermal energy storage (TES) technology is an effective method to enhance the planning and the economy of the combined heat and power (CHP) plants, while it has still not been broadly promoted in China. In this paper we firstly establish a mathematical model for a Chinese CHP plant with TES. Then the EnergyPRO software is used to find the optimum type of the TES tank in a three-tariff electricity pricing market and the operation strategy of the CHP plant with the selected TES tank is studied. Thirdly, the economic benefits of the system with/without TES is evaluated. The results show that adding a TES tank with volume of 24000m3 can significantly increase operational profits of the CHP system and reduce the use of peak-shaving heat source.

scholarly journals Thermodynamic and Exergoeconomic Analysis of a Supercritical CO2 Cycle Integrated with a LiBr-H2O Absorption Heat Pump for Combined Heat and Power Generation

2020 ◽  
Vol 10 (1) ◽  
pp. 323 ◽  
Author(s):  
Yi Yang ◽  
Zihua Wang ◽  
Qingya Ma ◽  
Yongquan Lai ◽  
Jiangfeng Wang ◽  
...  
Keyword(s):  
Heat Pump ◽  
Supercritical Co2 ◽  
Waste Heat ◽  
Unit Cost ◽  
Heating System ◽  
Combined Heat And Power ◽  
Economic Benefits ◽  
Ammonia Water ◽  
Absorption Heat Pump ◽  
Comparison Results

In this paper, a novel combined heat and power (CHP) system is proposed in which the waste heat from a supercritical CO2 recompression Brayton cycle (sCO2) is recovered by a LiBr-H2O absorption heat pump (AHP). Thermodynamic and exergoeconomic models are established on the basis of the mass, energy, and cost balance equations. The proposed sCO2/LiBr-H2O AHP system is examined and compared with a stand-alone sCO2 system, a sCO2/DH system (sCO2/direct heating system), and a sCO2/ammonia-water AHP system from the viewpoints of energy, exergy, and exergoeconomics. Parametric studies are performed to reveal the influences of decision variables on the performances of these systems, and the particle swarm optimization (PSO) algorithm is utilized to optimize the system performances. Results show that the sCO2/LiBr-H2O AHP system can obtain an improvement of 13.39% in exergy efficiency and a reduction of 8.66% in total product unit cost compared with the stand-alone sCO2 system. In addition, the sCO2/LiBr-H2O AHP system performs better than sCO2/DH system and sCO2/ammonia-water AHP system do, indicating that the LiBr-H2O AHP is a preferable bottoming cycle for heat production. The detailed parametric analysis, optimization, and comparison results may provide some references in the design and operation of sCO2/AHP system to save energy consumption and provide considerable economic benefits.

The Impact of Australia’s Carbon Price on the Optimisation and Selection of Gas Turbine CHP System

2013 ◽  
Author(s):  
Chanel A. Gibson ◽  
Mehdi Aghaei Meybodi ◽  
Masud Behnia
Keyword(s):  
Gas Turbine ◽  
Carbon Price ◽  
Combined Heat And Power ◽  
Present Worth ◽  
Dual Connection ◽  
Chp System ◽  
The Impact ◽  
Optimum Working ◽  
Selection Of

This paper aims to indentify the impact of Australia’s carbon pricing mechanism on the optimization of a gas turbine combined heat and power (CHP) system using a thermo-economic approach. Three economic scenarios were considered: no carbon price (case one); carbon price and not liable (case two); and a carbon price and liable (case three). With the intention of demonstrating the methodology used and to identify the impact of the carbon price quantitatively, a case study was utilized. Pricing data sourced from an ongoing investigation at this institution was employed to facilitate the three economic scenarios in addition to the yearly price fluctuations. The system was permitted to operate at off-design conditions in order to determine the optimum working conditions for each month. The analysis drew on the economic indicators of net present worth and payback period. Two connection modes to the grid were considered: a single connection that allowed only for the purchasing of supplementary electricity from the grid and a dual connection which allowed both purchasing and selling of electricity.

Optimization of a Small Size CHP System by Means of a Fully Transient Numerical Approach

2017 ◽  
Author(s):  
Luigi Chiantera ◽  
Massimo Milani ◽  
Luca Montorsi ◽  
Matteo Stefani
Keyword(s):  
Energy Efficiency ◽  
Ad Hoc ◽  
Electric Energy ◽  
Numerical Approach ◽  
Combined Heat And Power ◽  
Battery Capacity ◽  
Energy Conversion Systems ◽  
One Year ◽  
Chp System

The paper investigates the performance of a combined heat and power system by means of a fully dynamic numerical approach. An ad-hoc library for the simulation of energy conversion systems is developed under the OpenModelica open source platform; the library includes the main components that usually equip a Combined Heat and Power (CHP) system and they can be connected as they are logically connected in the real plant. Each component is modelled by means of equations and correlations that calculate their performance on a time dependent basis. Therefore, many configurations can be evaluated not only in terms of cumulative annual results or average performance, but the instantaneous behavior can be investigated. The numerical library is constructed using the lumped and distributed parameter approach and it is validated by comparing the numerical results with the measured values over a one-year time period. The prediction capabilities of the proposed numerical approach are evaluated by simulating a case study of a health spa. This case study is selected since it is characterized by significant requirements of both thermal and electric energy. The comparison demonstrated that the calculated results are in good agreement with the measurements in terms of both annual values and distribution over the reference period. Furthermore, an optimization algorithm is adopted and linked to the developed library in order to estimate the best size of different components of the CHP system according to a number of constraints. This feature is particularly important when addressing the energy efficiency of a complete system that is depending on a number of interdependent variables. Therefore, the case study is investigated by accounting also for additional technologies that can be further enhance the performance of the system both in terms of energy consumption and economic investment. In particular, the numerical model is used to optimized the CHP energy efficiency by estimating the best trade-off between the reduction of the energy purchased and the overall cost of the system. The application of PV panels and electric energy accumulators is also investigated and the simulation demonstrates that the size of the cogeneration unit equal to 48 kW, the number of PV panels of 299 and the battery capacity of 45 kWh provide the lowest amount of energy purchased, while the best return of investment is obtained by the CHP unit of 40 kW along with 109 PV panels and a battery of 40 kWh.

scholarly journals Leveraging the 4th Industrial Revolution Technology for Sustainable Development of the Northern Sea Route (NSR)—The Case Study of Autonomous Vessel

2021 ◽  
Vol 13 (15) ◽  
pp. 8211
Author(s):  
Sung-Woo Lee ◽  
Jisung Jo ◽  
Sewon Kim
Keyword(s):  
Industrial Revolution ◽  
Winter Season ◽  
Measurement Data ◽  
Economic Benefits ◽  
Economic Feasibility ◽  
Working Environment ◽  
Environmental Benefits ◽  
Fuel Oil ◽  
The Arctic

The Fourth Industrial Revolution (4IR) technology has been applied to various industrial areas not only to improve economic efficiency but also to obtain environmental and safety benefits. We paid attention to the unresolved issues of Arctic development to establish a balance between economic feasibility and social values and suggest the 4IR technologies as the solution for this. The master concept of application of the 4IR technology to NSR sailing is presented. Further, we conducted a case study for autonomous vessels. A cost breakdown structure model is specified to compare the total costs of traditional and autonomous vessels. Then, we conducted scenario analysis to investigate the economic and social effects of autonomous vessels by season and route. The results show that autonomous vessels have economic benefits compared to the traditional vessel even in the winter season, and if we realize autonomous vessels in the NSR, there are more cost saving effects than in the Suez Canal Route (SCR) in any season. As for the environmental benefits, autonomous vessels have lower gas emissions and reduced water disposal compared to the traditional vessel. Further, autonomous vessels could be a solution to provide a better crew working environment by minimizing the number of people on board. The contribution of this research is that, first, we utilize real fuel oil consumption measurement data to estimate the voyage expenses, and, second, this is a novel attempt of applying the 4IR technology as a solution for the Arctic development issue. In this respect, this research is expected to serve as a cornerstone for future research, and it will help to establish Arctic development strategies in Arctic or non-Arctic countries.

scholarly journals Techno, Economic and Environmental Assessment of a Combined Heat and Power (CHP) System—A Case Study for a University Campus

Energies ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 1133 ◽  
Author(s):  
Khuram Amber ◽  
Tony Day ◽  
Naeem Ratyal ◽  
Adnan Kiani ◽  
Rizwan Ahmad
Keyword(s):  
Environmental Assessment ◽  
Combined Heat And Power ◽  
University Campus ◽  
System A ◽  
Chp System

The Energy Efficiency and Economic Feasibility Analysis of the Distributed Absorption Cooling Combined With District Heating System

2009 ◽  
Author(s):  
Qunli Zhang ◽  
Lin Fu ◽  
Lihua Li ◽  
Hongfa Di
Keyword(s):  
Energy Efficiency ◽  
District Heating ◽  
Heating System ◽  
Economic Feasibility ◽  
Utilization Efficiency ◽  
Coefficient Of Performance ◽  
District Heating System ◽  
Absorption Cooling ◽  
Energy Efficiency Evaluation ◽  
Chp System

The distributed absorption cooling based district heating system was investigated in order to utilizing the reject heat from the combined heat and power (CHP) plant in summer. Compared with the electric compressor cooling, the energy efficient and cost-effectiveness of the distributed absorption cooling were furthermore analyzed by the Fuel Energy Saving Ratio (FESR) method. The sensitivity of some variables, such as the average electric efficiency, heating and electric generation efficiency of the CHP system, and the coefficient of performance (COP) of the chiller, were analyzed. The marginal heating price of the distributed absorption cooling can be obtained. According to the evaluation results, the applicability of the distributed cooling with district heating system is limited by the lower energy efficiency and economical benefits. The approaches to increase the energy efficiency were suggested in this paper. The improved distributed absorption cooling combined with liquid desiccant dehumidification which has higher heating utilization efficiency was put forward and analyzed, and the energy efficiency evaluation results showed that the improved distributed cooling has higher energy efficiency and economical benefits, and great applicability.

Economic, Emissions, and Energy Benefits From Combined Heat and Power Systems by Location in the United States Based on System Component Efficiencies

2013 ◽  
Author(s):  
Amanda D. Smith ◽  
Pedro J. Mago
Keyword(s):  
Energy Consumption ◽  
Energy Savings ◽  
Heating System ◽  
Primary Energy ◽  
Combined Heat And Power ◽  
Operating Costs ◽  
Electrical Efficiency ◽  
Potential Benefits ◽  
Chp System ◽  
Electrical Generation

A graphical evaluation is performed for combined heat and power (CHP) systems using screening parameters for optimized performance with respect to operating costs, emissions, and energy consumption. CHP systems have the potential to reduce operating costs, emissions, and primary energy consumption when compared with electricity purchased from the grid and thermal energy produced from a boiler, and these benefits have been shown to depend on the location where the system is to be installed as well as the characteristics of the system itself. A CHP system is analyzed in 9 U.S. cities in different climate zones which differ in both the local electricity generation fuel mix and local electricity prices. Its potential to produce economic, emissions, and energy savings is quantified based on the concepts of required spark spread, emissions spark spread, and primary energy spark spread. The corresponding parameters for cost ratio, carbon dioxide emissions ratio, and primary energy ratio are plotted on a 3-dimensional graph which illustrates these potential benefits simultaneously. The location of each point on the 3-D graph indicates for a given geographical location whether the system falls within a region of multiple potential benefits from CHP technology. The results are unique to the efficiencies of the CHP system components and the alternate heating system. A simple sensitivity analysis is then conducted to examine the influence of electrical generation efficiency, the percentage of heat recovered, and the heating system on the cost, emissions, and energy savings potential of CHP systems. Of the 9 cities analyzed, Duluth, MN, is shown to have the greatest potential to provide these three types of benefits by using a CHP system. The results are most sensitive to the values of two input parameters: CHP electrical efficiency and CHP thermal efficiency. Changes in the input efficiency values are most influential when the electrical efficiency is low, and as the amount of recovered heat goes to 0, the electrical efficiency becomes the most important factor in whether a CHP shows the potential for cost, emissions, and energy benefits.

Research on the Theory of CHP System in Controlling Air Pollution in Northern Cities

2014 ◽  
Vol 587-589 ◽  
pp. 731-734
Author(s):  
Ling Jing ◽  
Xin Xia Wang
Keyword(s):  
Carbon Dioxide ◽  
Air Pollution ◽  
Power Systems ◽  
Heating System ◽  
Combined Heat And Power ◽  
Hot Water ◽  
Air Conditioning System ◽  
Northern Cities ◽  
New Type ◽  
Chp System

This paper in view of the northern city produce large amounts of carbon dioxide in winter for heating and cause increasingly serious air pollution when burns coal, puts forward supply theory of combined heat and power (CHP) systems to provide housing and shops daily hot water supply, electricity, heating, cooling energy and designed a validation to test process and verify the formula of Combined Heat and Power systems , traditional heating system and air conditioning system in carbon dioxide discharge. Demonstrate the theory basis and validation method for using new type of heating mode when heating season in north.

A Feasibility Study of the Use of Solar Photovoltaic Energy in Saudi Arabia: A Case Study Assessment in a Factory in Zulfi City

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Yosry A. Azzam ◽  
Nagwa Ibrahim
Keyword(s):  
Saudi Arabia ◽  
Renewable Energy ◽  
Feasibility Study ◽  
Net Present Value ◽  
Economic Benefits ◽  
Economic Feasibility ◽  
Discounted Cash Flow ◽  
Pv System ◽  
Levelized Cost Of Electricity

Few studies have been implemented to evaluate whether the renewable energy generation could fit into industrial locations in Saudi Arabia. We completed this feasibility study to investigate whether using photovoltaic (PV) solar arrays to power industrial cities at Saudi Arabia is economically feasible. The case study is a factory in Zulfi city, Riyadh Region. We used National Renewable Energy Laboratory's modeling tool, system advisor model (SAM) to evaluate the economic benefits of using a 150 kW DC PV system to cover 100% of the factory monthly power demand. Over 25 years, the system is estimated to generate about 6,000,000 kWh of electricity whose net savings are $398,000 (1 US$ is equal to about 3.75 Saudi Riyals) represented by a discounted cash flow. The proposed system will save the factory around $304,000 that would have to be paid in electric bills and will eliminate considerable amount of CO2 emissions. Sensitivity analysis has been conducted to determine the effects of underlying parameters on the economic feasibility of the proposed system. Levelized cost of electricity (LCOE) generated and net present value (NPV) are used as indicators of proposed system feasibility. The results indicate that these projects can be profitable under some certain assumptions and can potentially be generalized for all industrial locations in Saudi Arabia.

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