Assessing the Energy Efficiency of Pumps and Pump Units: by em. Dr.-Ing Bernd Stoffel

By em. Dr.-Ing Bernd Stoffel

Assessing the power potency of Pumps and Pump Units, built in cooperation with Europump, is the 1st booklet on hand supplying the historical past, method, and review instruments for figuring out and calculating strength potency for pumps and prolonged items (pumps+motors+drives). Responding to new ecu specifications for pump potency, and US DOE exploratory paintings in atmosphere pump power potency directions, this booklet presents rationalization, derivation, and representation of PA and EPA tools for assessing strength potency. It surveys laws with regards to pump strength efficiencies, presents history on pump and motor efficiencies, and describes the idea that of power potency Index (EEI) for circulators and unmarried and multi-pump systems.

  • The first booklet to hide Europump- subsidized examine on strength potency in pumps, together with assurance of latest ecu guidance carried out in January 2015
  • Discusses Product technique (PA) and prolonged Product strategy (EPA) to assessing strength efficiency
  • Derives and explains the minimal potency Index (MEI)

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Additional info for Assessing the Energy Efficiency of Pumps and Pump Units: Background and Methodology

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In other cases, the components of a pump unit (pump, motor, and, if available, CDM or integrated PDS) are purchased from different manufacturers and assembled to a final product by another company. In these cases, ● ● the pump should be selected as in the case mentioned previously the motor (without or with a CDM) should be sized correctly regarding the mechanical power required by the pump. As mentioned in Ref. [5], there is a tendency in practice to oversize motors based on a misguided belief that larger motors will operate more reliably for a given application.

In this group, the concept of the Minimum Efficiency Index (MEI) was developed (described in Chapter 7). A basic principle of this concept is to include into the assessment of the energy efficiency of pumps operated at fixed speed—besides their efficiency at nominal operating condition (BEP)—also the pump efficiency in a certain range around BEP. To create a scientific and technical basis for a method of assessing the energy efficiency of pumps by their MEI, a project at the Technische Universitaet (5University of Technology) Darmstadt (TUD) was initiated and supported by Europump; see the final report [30].

For the converter-fed motor and for the CDM, the classes are denominated with IE plus the class number (beginning with zero). For the PDS, the classes are denominated with IES plus the class number (beginning with zero). The IE classes for the converter fed motors are under consideration to be defined in the future Standard IEC 60034-30-2 (see above). For the CDMs and the PDSs, in the present version of EN 50598-2 only the classes IE0 to IE2 and IES0 to IES2, respectively, are defined. The classes are ● ● ● IE0 and IES0, respectively, if the related losses are more than 25% higher than those of the reference devices IE1 and IES1, respectively, if the related losses are in the range of 625% of those of the reference devices IE2 and IES2, respectively, if the related losses are more than 25% lower than those of the reference devices.

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