BS EN 17038-1:2019 pdf free.Pumps – Methods of qualification and verification of the Energy Efficiency Index for rotodynamic pump units.
In order to assess the efficiency of pump units, their actual electrical power input P1, avg is compared with a reference value called P1, ref. It is a nominal power input of a fictitious pump unit running at nominal 100 % point. The value of P1, ref for the different pump types are defined in other parts of this standard. The declared EEI value is based on the actual pump curves whether these are realized with full diameter impeller, a trimmed impeller or a power limited curve. NOTE Contrary to the efficiency values η of the unit components, the lower the numerical value of EEI, the better the energy efficiency of pump units. Weighted-average value of the electric power input.In order to simplify further the determination of a value which characterizes the energy efficiency of pump units, in this document the different flow-time profiles are described by a limited number of points, not by a continuous curve or function. These discrete points are pairs of values of Q/Q100 % and 0t/ttot. These values define the discretised flow-time profiles. They are given as reference flow-time profiles in the specific parts of this standard. (In this case, Ot is a finite fraction of operating time and Q/Q100 % is the average value of relative flow rate demanded within this time fraction.) The quantification of energy efficiency of pump units should be based on the weighted average of electrical power input P1, avg. The weighting factor when averaging the electrical power input P1 is the fraction of operating time at the respective flow rate. Generally, for any application there is a continuous function describing the dependency of [differential) time fraction dt/tot on the relative flow rate Q/Q100 % where ttot is the total operating time and Q100 % is defined in the specific parts of this standard. For the assessment of the energy efficiency of pump units, common and standardized “flow-time profiles” are needed as basis for indicating their energy efficiency. The flow-time profile is defined for each pump type in other parts of this standard.BS EN 17038-1 pdf download.