scholarly journals System effects of primary energy reduction connected with operation of the CHP plants

2017 ◽  
Vol 38 (2) ◽  
pp. 61-79
Author(s):  
Andrzej Ziębik ◽  
Paweł Gładysz
Keyword(s):  
Distribution Network ◽  
Primary Energy ◽  
Combined Heat And Power ◽  
Heat Losses ◽  
Energy Reduction ◽  
Processing Unit ◽  
Heat Distribution ◽  
Absorption Chiller ◽  
Technical Literature ◽  
Internal Consumption

AbstractThe paper is devoted to explication of one of the advantages of heat and electricity cogeneration, rarely considered in technical literature. Usually attention is paid to the fact that heat losses of the heat distribution network are less severe in the case of cogeneration of heat in comparison with its separate production. But this conclusion is also true in other cases when the internal consumption of heat is significant. In this paper it has been proved in the case of two examples concerning trigeneration technology with an absorption chiller cooperating with a combined heat and power (CHP) plant and CHP plant integrated with amine post-combustion CO2processing unit. In both considered cases it might be said that thanks to cogeneration we have to do with less severe consequences of significant demand of heat for internal purposes.

scholarly journals Integration of Decentralized Thermal Storages Within District Heating (DH) Networks

2016 ◽  
Vol 18 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Georg K. Schuchardt
Keyword(s):  
Distribution System ◽  
Heat Storage ◽  
Thermal State ◽  
Distribution Network ◽  
District Heating ◽  
Exergy Efficiency ◽  
Heat Losses ◽  
Heat Distribution ◽  
Energy And Exergy ◽  
Business Opportunities

Abstract Thermal Storages and Thermal Accumulators are an important component within District Heating (DH) systems, adding flexibility and offering additional business opportunities for these systems. Furthermore, these components have a major impact on the energy and exergy efficiency as well as the heat losses of the heat distribution system. Especially the integration of Thermal Storages within ill-conditioned parts of the overall DH system enhances the efficiency of the heat distribution. Regarding an illustrative and simplified example for a DH system, the interactions of different heat storage concepts (centralized and decentralized) and the heat losses, energy and exergy efficiencies will be examined by considering the thermal state of the heat distribution network.

Solar Thermal Driven Cooling System for a Data Center in Albuquerque New Mexico

2010 ◽  
Author(s):  
N. Fumo ◽  
V. Bortone ◽  
J. C. Zambrano
Keyword(s):  
Energy Consumption ◽  
Data Center ◽  
Data Centers ◽  
Primary Energy ◽  
Continuous Operation ◽  
Solar Thermal ◽  
Primary Energy Consumption ◽  
Solar Collectors ◽  
Absorption Chiller ◽  
Solar Cooling

Data centers are facilities that primarily contain electronic equipment used for data processing, data storage, and communications networking. Regardless of their use and configuration, most data centers are more energy intensive than other buildings. The continuous operation of Information Technology equipment and power delivery systems generates a significant amount of heat that must be removed from the data center for the electronic equipment to operate properly. Since data centers spend up to half their energy on cooling, cooling systems becomes a key factor for energy consumption reduction strategies and alternatives in data centers. This paper presents a theoretical analysis of an absorption chiller driven by solar thermal energy as cooling plant alternative for data centers. Source primary energy consumption is used to compare the performance of different solar cooling plants with a standard cooling plant. The solar cooling plants correspond to different combinations of solar collector arrays and thermal storage tank, with a boiler as source of energy to ensure continuous operation of the absorption chiller. The standard cooling plant uses an electric chiller. Results suggest that the solar cooling plant with flat-plate solar collectors is a better option over the solar cooling plant with evacuated-tube solar collectors. However, although solar cooling plants can decrease the primary energy consumption when compared with the standard cooling plant, the net present value of the cost to install and operate the solar cooling plants are higher than the one for the standard cooling plant.

Effect of Different Italian Regulatory Frameworks on the Energetic Assessment of CHP Plants: A Comparative Design and Experimental Condition Analysis

2013 ◽  
Author(s):  
Marco Badami ◽  
Giacomo Bocci ◽  
Francesco Camillieri ◽  
Davide Pagliarulo ◽  
Armando Portoraro ◽  
...  
Keyword(s):  
Power Plants ◽  
Energy Savings ◽  
Primary Energy ◽  
Combined Heat And Power ◽  
Economic Benefits ◽  
Prime Mover ◽  
Design Data ◽  
European Directive ◽  
Regulatory Frameworks ◽  
Italian Legislation

Since a Combined Heat and Power (CHP) plant can offer high economic benefits when a certain energy savings value is obtained, it is very interesting to consider the requirements foreseen by legislation to meet this target. The paper deals with an energetic assessment of eleven industrial CHP power plants, based on different prime mover technologies installed and in operation in Italy. The analysis has been carried out considering not only the nominal design data of the plants, but also experimental ones, in order to highlight their real operational performances. The aim of the study was to compare the effects of two legislations on the calculation of the primary energy savings: the first is the Italian legislation that was in force when the power plants were designed, and the second is the current European Directive, which was issued a few years later when the plants were already in operation. The results of the study show as the subsidy mechanism introduced by the new legislation is stricter than the previous one, and could have a significant effect on the economic profitability of a cogeneration plant installation. More critical comments on the overall regulatory framework are presented in the paper.

Sensitivity analysis of heat losses in collective heat distribution systems using an improved method of EPBD calculations

Energy ◽  
2017 ◽  
Vol 140 ◽  
pp. 850-860 ◽  
Author(s):  
Julio Efrain Vaillant Rebollar ◽  
Eline Himpe ◽  
Jelle Laverge ◽  
Arnold Janssens
Keyword(s):  
Sensitivity Analysis ◽  
Distribution Systems ◽  
Heat Losses ◽  
Heat Distribution ◽  
Improved Method

Evaluation of Combined Heat and Power (CHP) Systems Performance With Dual Power Generation Units

2012 ◽  
Author(s):  
Alta Knizley ◽  
Pedro J. Mago
Keyword(s):  
Power Generation ◽  
Carbon Dioxide Emissions ◽  
Operating Cost ◽  
Primary Energy ◽  
Combined Heat And Power ◽  
Department Of Energy ◽  
Environmental Benefits ◽  
Optimum Operating ◽  
Electric Load ◽  
Chp System

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. A benchmark building developed by the Department of Energy for a full-service restaurant in Chicago, IL is used to analyze the proposed configuration. This location is selected since it usually provides favorable CHP system conditions in terms of cost and emissions reduction. In this investigation, one PGU is operated at base load to satisfy part of the electricity building requirements (PGU1), while the other is used to satisfy the remaining electricity requirement operating following the electric load (PGU2). The dual-PGU configuration (D-CHP) is modeled for several different scenarios in order to determine the optimum operating range for the selected benchmark building. The dual-PGU scenario is compared with the reference building using conventional technology to determine the economical, energetic, and environmental benefits of this proposed system. This condition is also compared to a CHP system operating following the electric load (FEL) and to a base-loaded CHP system, and it provides greater savings in operating cost, primary energy consumption, and carbon dioxide emissions than the optimized conditions for base loading and FEL.

Short-Term Generation Schedule Optimisation for Combined Heat and Power

2011 ◽  
Author(s):  
E. E. B. Gomes ◽  
P. Pilidis ◽  
A. L. Polyzakis
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Electricity Market ◽  
Power Plants ◽  
Hybrid Genetic Algorithm ◽  
Combined Heat And Power ◽  
End Users ◽  
Technical Literature ◽  
Priority List ◽  
Distributed Generators

In the last decades one of the most difficult problems in the electricity market has been how to dispatch and manage the electricity in power generation plants. Despite of all the benefits of distributed poly-generation and combined heat and power systems, their penetration in the power market worldwide is quite modest and one of the barriers against their increasing participation is the high fees for back-up supplies, which is one of the problems addressed in this investigation. This paper introduces a pool of distributed generation units (named nerve-centre) able to economically optimise the generation schedule of gas turbine power plants and end-users interconnected through a mini-grid. A hybrid genetic algorithm adapted priority list was developed to solve the multi unit generation schedule optimisation problem. The algorithm developed in this study leads the optimisation mechanism to a faster convergence and a very low risk of non-convergence to the optimal result. Despite the power generation optimisation studies reported in the technical literature, none of them has been modelled for such a pool of distributed generators trading electricity in the competitive market. This investigation shows that the proposed nerve-centre concept can result in significant savings to generators/end-users.

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