More Effective Control for Centrifugal Gas Compressors Operating in Parallel

1986 ◽  
Author(s):  
Naum Staroselsky ◽  
Lawrence Ladin
Keyword(s):  
Energy Efficiency ◽  
Natural Gas ◽  
Chemical Industry ◽  
Energy Savings ◽  
Major Elements ◽  
Large Energy ◽  
Effective Control ◽  
Compressor Station ◽  
Level Of Automation ◽  
Definition Of

Parallel Operating centrifugal gas compressors are major elements in the chemical industry, in oil production and in natural gas gathering, injection, separation, transmission and LNG production. Large energy savings, reduced repairs and improved automation are possible with more effective solutions for compressor station control. The authors suggest an improved definition of compressor energy efficiency. They analyze several common approaches to control of parallel compressors and evaluate them in terms of energy efficiency, stability of control, equipment protection and level of automation. An improved system developed by one of the authors will be described theoretically and with an example from field operation.

scholarly journals Economic assessment of energy efficiency investments in dwellings = Evaluación económica de inversiones de eficiencia energética en viviendas

2017 ◽  
Vol 1 (2) ◽  
pp. 36 ◽  
Author(s):  
Hector Hernández
Keyword(s):  
Energy Efficiency ◽  
Energy Savings ◽  
Economic Assessment ◽  
Energy Performance ◽  
Point Of View ◽  
Economic Modelling ◽  
Evaluación Económica ◽  
Energy Performance Of Buildings ◽  
The Moment ◽  
Definition Of

In order to improve the energy performance of buildings, the need to value economically investments of energy efficiency associated with the rehabilitation of dwellings arises. This point of view provides an useful tool for analysts who start in the economic appraisal of energy efficiency investments. The present research gives a conceptual framework for the economic assessment of these types of investments in dwellings. As a result, it is possible to identify two techniques in the appraisals of this nature: dynamic and static approaches. Both methods contrast the benefits (energy savings) with the costs of investments over time. However, they differentiate the opportunity and the moment when investment must be carried out given an uncertainty scenario. This conceptual precision allows the study of several publications where different alternatives in retrofitting houses where evaluated, confirming the considerations that must be taken into account when economic modelling is made: the type of approach to be used (dynamic or static) and; at the definition of the investment alternatives and scenarios, the aspects of time, irrevocability and uncertainty.ResumenEn pro de la mejora del desempeño energético de los edificios, surge la necesidad de evaluar económicamente las inversiones de eficiencia energética asociadas a la rehabilitación de viviendas. Este punto de vista trata de ser una herramienta útil para analistas que se inicien en la evaluación económica de inversiones en eficiencia energética. La presente investigación muestra un marco conceptual de la evaluación económica de este tipo de inversiones en viviendas. Como resultado, es posible identificar dos enfoques presentes en los análisis económicos de esta naturaleza: el dinámico y el estático. Ambos métodos contrastan los beneficios (ahorros energéticos) con los costes de las inversiones en el tiempo. Sin embargo, diferencian la oportunidad y el momento en que la inversión debe realizarse dado un escenario de incertidumbre. Esta precisión conceptual permite estudiar varias publicaciones donde se evaluaron diferentes alternativas de reacondicionamiento en viviendas, confirmándose las consideraciones que deben tenerse presentes en momento de realizar la modelación económica: el tipo de enfoque a usar (dinámico o estático) y, en la definición de las alternativas de inversión y escenarios, los aspectos de tiempo, irrevocabilidad e incertidumbre.

Energy efficiency and the CDM in South Africa: constraints and opportunities

2007 ◽  
Vol 18 (1) ◽  
pp. 29-38 ◽  
Author(s):  
H. Winkler ◽  
D. Van Es
Keyword(s):  
South Africa ◽  
Energy Efficiency ◽  
Energy Savings ◽  
Clean Energy ◽  
Demand Side Management ◽  
Major Elements ◽  
Small Scale ◽  
Level Energy ◽  
Demand Side ◽  
Barriers To Energy Efficiency

Energy-efficiency projects were expected to consti-tute an important project type under the Clean Development Mechanism (CDM). In South Africa, there is significant potential for energy savings in several sectors. The savings possible in industry have been demonstrated through plant-level energy audits, measurement and verification of Eskom’s Demand Side Management (DSM) programme and national energy modelling. Enabling policy for energy efficiency and demand-side management has been adopted by government and the utility, Eskom. A dedicated National Energy Efficiency Agency (NEEA) was established in 2006. Yet, energy-efficiency still fails to realise its potential. The paper seeks to dispel the misconception that energy efficiency projects might not be ‘additional’ under the CDM. Analysis of barriers, which is well understood by those dealing with energy efficiency, can be used to demonstrate additionality. A stan-dard tool for demonstrating additionality is now available, as are baseline methodologies for both large and small-scale CDM projects. It should, therefore, be clear that energy efficiency projects are not a priori ruled out as non-additional. Each proj-ect has to demonstrate additionality, as for any other project type. Finances are available from various sources, and the CDM can offer further funding for initial costs, or in removing the barriers to energy-efficiency projects. Internationally, energy efficiency initially did not account for large numbers of CDM projects, nor a major share of carbon credits. With the recent growth in CDM projects, however, the numbers of energy-efficiency projects are increasing internation-ally. In South Africa, analysis of the emerging CDM portfolio shows that energy-efficiency projects are much better represented at the concept stage than in fully designed CDM projects.The major elements for implementing energy-efficiency projects exist – dedicated institutions, enabling policy frameworks, approved methodolo-gies and even an electricity crisis to raise awareness. Funding is available from various sources, and the CDM can offer further funding for initial costs or in removing the barriers to energy-efficiency projects. The CDM rules should soon allow for registration of entire programmes, which could include energy-efficiency standards or demand-side management. Innovative financing solutions such as clean energy lending can assist as well. All that seems to be needed is a concerted effort to realise the potential. Such efforts could be driven by the Designated National Authority or the National Energy Efficiency Agency. Together with initiatives from the private sector, a dedicated effort might help South Africa find a clear route for ener-gy-efficiency projects under the CDM in South Africa.

MNEs and Energy Efficiency in Southeast Asian Manufacturing

2013 ◽  
Vol 12 (3) ◽  
pp. 120-147 ◽  
Author(s):  
Eric D. Ramstetter ◽  
Shahrazat Binti ◽  
Archanun Kohpaiboon ◽  
Dionisius Narjoko
Keyword(s):  
Energy Efficiency ◽  
Natural Gas ◽  
Total Energy ◽  
Host Country ◽  
Multinational Enterprises ◽  
Large Energy ◽  
Manufacturing Plants ◽  
Energy Technologies ◽  
Local Manufacturing ◽  
Plant Level

After controlling for the influences of plant-level factor usage and technical characteristics, foreign multinational enterprises (MNEs) used fuel and total energy more efficiently than local manufacturing plants in about one-third of Malaysia's large energy using industries. MNE-local or MNE-private differentials were insignificant, however, in most industries for electricity in Malaysia; total energy, electricity and three fuels (diesel, natural gas, and coal) in Indonesia; and total energy in Thailand. In short, MNEs and local or private plants generally used purchased energy with similar efficiency, probably because they faced similar host country policies and used similar energy technologies.

scholarly journals EXERGOECONOMIC APPROACH TO THE PROBLEMS OF ENERGY CONSUMPTION ASSESSMENT IN HOUSING AND COMMUNAL SERVICES OF UKRAINE

2021 ◽  
Vol 2 (37) ◽  
pp. 59-63
Author(s):  
I. Dolgopolov ◽  
V. Tuchin ◽  
D. Marchenko
Keyword(s):  
Energy Efficiency ◽  
Natural Gas ◽  
Water Supply ◽  
Energy Savings ◽  
Price Policy ◽  
Energy Flows ◽  
Just Price ◽  
The Given

An attempt to use the base thermodynamics and exergoeconomic aspects of decision tasks of energy efficiency and energy saving with the examples of in heat-, gas- and watersupply in housing and communal services of Ukraine is presented. The methodology of forming the analytical dependences of account and payment of the got and used heat is presented as a result of this approach. This system of account has the followings advantages: 1) the sum of payment takes into account not only an amount but also quality of energy flows; 2) efficiency of work of all elements of this system is taken into account.  The operating presently system of tariffs on natural gas does not take into account current composition of gas and exergy of gas. Dependence, which takes into account the real exergy of natural gas which is supplied, is offered in relation to the minimum exergy of natural gas, which is foreseen DSTU. At forming of cost of water-supply in dependence for determination of sum of payment for water is suggested to enter a constituent, which takes into account the exergy of stream of water, which influences the amount and pressure of the given water. Realization in practice of the exergyeconomic going near tariffs on energy which is consumed in housing and communal services of Ukraine allows from single power positions objectively to estimate efficiency of functioning of all elements of the systems heat-, gaz- and water-supplys. It allows practically to carry out market approach to forming of tariffs on heat-, gaz- and water-supply and to mobilize producers, suppliers and users of services, in this sphere of housing and communal services of Ukraine on an energy-savings and energy efficiency. It is necessary to expect that introduction of these principles has social influence because it is a step which unites the citizens of Ukraine in the decision of tasks of establishment of transparent and just price policy of the state in housing and communal services of Ukraine and improvements of situations with ecology in our country.

scholarly journals Justification of energy efficiency of the use of a trigeneration system for a compressor station

2020 ◽  
pp. 118-124
Author(s):  
K. K. Kutuev ◽  
S. M. Chekardovskiy
Keyword(s):  
Energy Efficiency ◽  
Natural Gas ◽  
Exergy Analysis ◽  
Operating Costs ◽  
Compressor Station ◽  
Simultaneous Generation ◽  
Fuel Prices ◽  
Energy Needs ◽  
Gas Compression ◽  
Key Factor

Today, the efficiency of transportation of natural gas is of paramount importance. Within this framework, the design and operation of compressor stations are a key factor significantly influencing the operating costs of gas transmission companies. Such conditions are characterized by a growing level of complexity, not only the choice of gas compression technology, but also the integration of systems due to energy needs, including electricity, heat, and cooling. The problems associated with fossil fuel prices, resources and environmental impact have led to increased efforts to develop more efficient systems in recent decades. One way to do this is to create several outlets in one system, which are the simultaneous generation of energy, heat, and cooling from the combustion of natural gas. The aim of the article is to develop recommendations for the implementation of innovative trigenerative optimization of the compressor station. At the same time, as part of the study, an exergy analysis was applied, which is aimed at assessing the energy efficiency of the selected trigenerative system. The data obtained indicate the possibility of not only introducing the adopted trigenerative configuration, but also of its individual elements to improve the energy efficiency of the system as a whole.

Legal and regulative foundation of securing the development of consolidated territorial communities in conditions of decentralization

2019 ◽  
pp. 16-19
Author(s):  
Oryslava Korkuna ◽  
Ivan Korkuna ◽  
Oleh Tsilnyk
Keyword(s):  
Development Strategy ◽  
Local Governments ◽  
Local Governance ◽  
Legal Regulation ◽  
Major Elements ◽  
The Development Strategy ◽  
Social Entity ◽  
European Standards ◽  
Definition Of ◽  
State Regional

Development of a territorial community requires efficient use of its capacity taking into account all possible aspects in the course of elaboration and implementation of the development strategy and other local legal and regulative documents. The approach is directly related to maintaining the living activity of a territorial community and should correspond to the interests of population and European standards of state regional policy. In addition to the definition of a community provided by the Law of Ukraine “On Local Governance in Ukraine”, there are also some other. For example, some authors understand territorial community as a single natural and social entity that operates in spatial boundaries of a state and realizes daily needs and interests of population. The paper aims to analyze legal and regulative foundation of the development of territorial communities in conditions of decentralization. The authors analyze current condition of legal and regulative maintenance of local governance reforming in Ukraine in conditions of decentralization of authorities. The paper argues that the major elements of management strategy in CTCs in Ukraine are independence, efficiency, management innovations, quicker and more substantiated decision-making and everything to meet the needs of community’s residents. Management of this sector is grounded on the principles of the provisions of European Charter of Local Self-Government that provides for decentralization of authorities and transfer of resources and responsibilities to local governments. Liabilities of local governments (of consolidated territorial communities) and the mayors are analyzed. The authors prove that in general legal provision of decentralization of local governance corresponds to European requirements and creates reliable ground for practical stage of the reform. The list of issues that require further legal regulation is outlined.

An Analysis of Actual Energy Savings in an Indian Cement Industry Through an Energy Efficiency Index

2012 ◽  
Vol 9 (8) ◽  
pp. 829-840 ◽  
Author(s):  
R. Saidur ◽  
M. T. Sambandam ◽  
M. Hasanuzzaman ◽  
D. Devaraj ◽  
S. Rajakarunakaran
Keyword(s):  
Energy Efficiency ◽  
Energy Savings ◽  
Efficiency Index ◽  
Cement Industry

scholarly journals Minimal Monitoring of Improvements in Energy Performance after Envelope Renovation in Subsidized Single Family Housing in Madrid

2020 ◽  
Vol 13 (1) ◽  
pp. 235
Author(s):  
Fernando Martín-Consuegra ◽  
Fernando de Frutos ◽  
Ignacio Oteiza ◽  
Carmen Alonso ◽  
Borja Frutos
Keyword(s):  
Energy Efficiency ◽  
Energy Savings ◽  
Low Cost ◽  
Energy Performance ◽  
Quality Parameters ◽  
Urban Setting ◽  
Single Family ◽  
Nineteen Fifties ◽  
Environment Quality ◽  
Urban Complex

This study quantified the improvement in energy efficiency following passive renovation of the thermal envelope in highly inefficient residential complexes on the outskirts of the city of Madrid. A case study was conducted of a single-family terrace housing, representative of the smallest size subsidized dwellings built in Spain for workers in the nineteen fifties and sixties. Two units of similar characteristics, one in its original state and the other renovated, were analyzed in detail against their urban setting with an experimental method proposed hereunder for simplified, minimal monitoring. The dwellings were compared on the grounds of indoor environment quality parameters recorded over a period covering both winter and summer months. That information was supplemented with an analysis of the energy consumption metered. The result was a low-cost, reasonably accurate measure of the improvements gained in the renovated unit. The monitoring output data were entered in a theoretical energy efficiency model for the entire neighborhood to obtain an estimate of the potential for energy savings if the entire urban complex were renovated.

scholarly journals Water Extraction from Air: A Proposal for a New Indicator to Compare Air Water Generators Efficiency

Energies ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 224
Author(s):  
Lucia Cattani ◽  
Anna Magrini ◽  
Paolo Cattani
Keyword(s):  
Energy Efficiency ◽  
Comprehensive Evaluation ◽  
Specific Energy Consumption ◽  
Energy Performance ◽  
Water Extraction ◽  
Coefficient Of Performance ◽  
Efficiency Evaluation ◽  
Evaluation Approach ◽  
Cycle Systems ◽  
Definition Of

Water extraction from air, based on reverse cycle systems, is becoming a technology more and more diffused and various models of air to water generators (AWG) are now available, all claiming the best efficiency. To date, there is not a standard indicator stating energy efficiency for AWGs, neither in the literature nor in technical practice. The only evaluation parameter, that can be found is a sort of specific energy consumption (SEC) without any clear indications about the involved calculation terms, definition of hypotheses, or environmental conditions. The current work is a first proposal of an indicator to standardise the AWG efficiency evaluation. The indicator is called WET (Water Energy Transformation); it states water production as a useful effect of an AWG machine and calculates its energy performance with an approach similar to COP (Coefficient of Performance) and EER (Energy Efficiency Ratio) evaluation. The indicator is meant to be a normalised tool that permits comparing different AWG machines, but it is also the first part of a wider study, currently under development that is oriented to obtain a global index formulation that combines WET itself, EER and COP, and it is intended for a comprehensive evaluation of all the useful effects of a reverse cycle in integrated machines, in compliance with the current efficiency evaluation approach. The current paper presents the WET equation, with a discussion about involved terms, a set of normalised calculation conditions and some application examples, including a comparison with SEC.

scholarly journals Real-World Implementation of an ICT-Based Platform to Promote Energy Efficiency

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2416
Author(s):  
Marina Dorokhova ◽  
Fernando Ribeiro ◽  
António Barbosa ◽  
João Viana ◽  
Filipe Soares ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Real World ◽  
Energy Savings ◽  
Quality Parameters ◽  
Horizon 2020 ◽  
Flexible Devices ◽  
Information And Communication ◽  
Energy Consuming ◽  
And Behavior ◽  
And Control

The energy efficiency requirements of most energy-consuming sectors have increased recently in response to climate change. For buildings, this means targeting both facility managers and building users with the aim of identifying potential energy savings and encouraging more energy-responsible behaviors. The Information and Communication Technology (ICT) platform developed in Horizon 2020 FEEdBACk project intends to fulfill these goals by enabling the optimization of energy consumption, generation, and storage and control of flexible devices without compromising comfort levels and indoor air quality parameters. This work aims to demonstrate the real-world implementation and functionality of the ICT platform composed of Load Disaggregation, Net Load Forecast, Occupancy Forecast, Automation Manager, and Behavior Predictor applications. Particularly, the results obtained by individual applications during the test phase are presented alongside the specific metrics used to evaluate their performance.

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