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Determination of Global Efficiencies of Variable Speed Pumps within Water Supply Systems

Abstract

The energy transformations involved in the operation of the pumping installations are carried out by pumping aggregates consisting of an electric motor and a pump. In order to provide a full adaptation to the users’ variable demands, variable speed motor driven pumps are used on networks (such motors being equipped with frequency converters). The paper presents a method for determining the global efficiency of a frequency converter-asynchronous motor-pump group. The method has been implemented at the Chiriţa Pumping Station, main facility within the Iasi City water supply system.

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Efficiency of the construction market and need for government regulation

Abstract

For a long time in economic theory and practice, regulation is only linked to the need for state intervention in monopolistic markets, by developing uniform, simple regulatory rules to limit and control the monopoly power, the monopoly price, mergers and acquisitions between companies in the same industry and others. In recent years the prevailing opinion that government regulation is particularly necessary in oligopolistic markets where there are several leading, dominant companies that can influence the price, quantity and quality of the product offered. However, this regulatory policy should not apply to common rules and taking into account the specifics of the market/industry, market structure (concentration level) of the various market segments and the relevant economic activity. The aim of the study: 1) Evaluation of the efficiency of the construction market, 2) Demonstrate the need for government intervention, 3) Guidelines for the implementation of the regulatory function of the government.

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Modern Concepts for Constructive Solutions in Dobrogea

5. REFERENCES [1] PHI(Passive House Institute) - https://passivehouse.com/ [2]. http://buildup.eu/en/node/9657 - The European portal for energy efficiency in building s [3]. Tepes Onea Florin, Tudorache Daniel (2017) „ The nonlinear Analysis of the Seismic Response of a reinforced Concrete Structure, Subjected to a Statically Equivalent Action ”, Bulletin of the Polytechnic Institute of Jassy, http://www.bipcons.ce.tuiasi.ro/Content/ArticleInformation.php?ArticleID=604 , Tomme: 63 (67)| Fascicle: 3, pg: 25-32 [4]. Grupa Normativelor

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