By em. Dr.-Ing Bernd Stoffel
Assessing the power potency of Pumps and Pump Units, built in cooperation with Europump, is the 1st e-book on hand offering the history, technique, and overview instruments for realizing and calculating strength potency for pumps and prolonged items (pumps+motors+drives). Responding to new european specifications for pump potency, and US DOE exploratory paintings in atmosphere pump power potency directions, this publication presents clarification, derivation, and representation of PA and EPA equipment for assessing strength potency. It surveys laws regarding pump power efficiencies, offers heritage on pump and motor efficiencies, and describes the idea that of strength potency Index (EEI) for circulators and unmarried and multi-pump systems.
- The first publication to hide Europump- subsidized learn on power potency in pumps, together with insurance of latest european guidance applied in January 2015
- Discusses Product procedure (PA) and prolonged Product method (EPA) to assessing strength efficiency
- Derives and explains the minimal potency Index (MEI)
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Extra info for Assessing the Energy Efficiency of Pumps and Pump Units: Background and Methodology
Relating to the internal power losses in a pump, the pump efficiency can also be expressed by the following equation: P P P Pmech 2 Ploss;pump Ploss;pump Ploss;pump =PBEP ηpump 5 512 512 Pmech Pmech Pmech =PBEP ð4:2Þ In this equation, Ploss/PBEP are related power losses (5related to the nominal pump power input) that occur in the pump and Pmech/PBEP is the relative pump power input. Especially for the point of BEP, the relative pump power input is equal to 1 and the efficiency is maximum (η 5 ηBEP).
The measurements and calculations to be done for the determination of EEI are described in a general form. This includes the description of how the part load operating points have to be adjusted and measured and how the measured power input has to be compensated for possible deviations of the actual load points from the reference control curve. The concept and methodology of the EEI are explained in more detail in Chapter 8. The standard defines permissible distances between H100% and curves published in the documentation (catalogs) according to the rated power input.
Pumps are denoted as glandless if the pump rotor of an electric motor is directly coupled to the impeller and immersed in the pumped medium. 5 kW. The document is split into three parts: ● ● ● Part 1: General requirements and procedures for testing and calculation of EEI Part 2: Calculation of EEI for stand-alone circulators Part 3: EEI for circulators integrated in products. 32 Assessing the Energy Efficiency of Pumps and Pump Units Stand-alone circulator means a circulator designed to operate independently from the product.
Assessing the Energy Efficiency of Pumps and Pump Units: Background and Methodology by em. Dr.-Ing Bernd Stoffel