CC BY
7
UDC 621.313
doi: 10.20998/2074-272X.2021.1.03
V.V. Goman, V.A. Prakht, V.M. Kazakbaev, V.A. Dmitrievskii, E.A. Valeev, A.S. Paramonov
ANALYSIS OF THE PAYBACK PERIOD OF A MODERNIZED PUMP UNIT WITH INDUCTION ELECTRIC MOTORS OF ADVANCED ENERGY EFFICIENCY CLASSES
Aim. The comparative analysis of energy consumption, electricity costs during lifetime cycle and payback period of a pump unit with 90 kW 2-pole induction motors, belonging to various energy efficiency classes, feeding directly from power grid. Methods. The examined operating modes aligned with a typical operating cycle of a pump unit with approximately constant flow rate of 75110 % of the rated flow. The calculations were based on the pump and induction motors nameplate data, which, in their turn, were based on the manufacturers' experimental data. Results. The calculations of energy consumption, electricity costs and payback periods of a pump unit with 90 kW 2-pole induction motors, feeding directly from power grid have been performed in the article. The application of induction motors belonging to IE2, IE3 and IE4 energy efficiency classes has been discussed. Practical value. It has been demonstrated, than in case of replacement of an induction motor of energy efficiency class IE2 due to planned retrofit, payback period for an IE4 induction motor is 2.18 years, energy savings within a calculated 20-year operating period are 268MWh, which makes €41110 in money terms. Under the same conditions, the replacement of an induction motor of energy efficiency class IE2 with an induction motor of energy efficiency class IE3 will allow to save 88 MW-h within a calculated operating period, which, expressed in monetary terms, is €13500 and the payback period is 5.11 years. Thus, the article proves that despite a higher initial price, the choice of an induction motor of energy efficiency class IE4 tends to be more economically advantageous. References 27, tables 4, figures 1.
Key words: centrifugal pump, energy efficiency, energy efficiency class, induction motor, throttling control, energy saving, lifetime cycle, payback period.
Мета. nopieHmbHm aHani3 розрахунюв енергоспоживання, витрат на електроенергiю протягом життевого циклу i термжв окупностi насосноi установки з 2-полюсними асинхронними електродвигунами потужтстю 90 кВт pi3Hux клаав енергоефективностi, що живляться безпосередньо вiд електричноi мережi. Методика. Розглянутi режими роботи вiдповiдають типовому циклу роботи, характерному для насосних установок з приблизно посттною витратою 75-110 % вiд номiнального. Розрахунок Грунтувався на паспортних даних насоса i електродвигутв, яш в свою чергу заснован на експериментальних даних виробниюв. Результат. У статтi проведено розрахунки енергоспоживання, витрат на електроенергю i термжв окупностi насосноi установки з 2-полюсними асинхронними електродвигунами потужтстю 90 кВт, що живляться безпосередньо вiд електричноi мережi. Розглянуто застосування електродвигутв з класами енергоефективностi IE2, IE3 i IE4. Практичне значення. Показано, що в разi замши електродвигуна класу енергоефективностi IE2 в зв'язку з плановою модертзащею електродвигуном класу енергоефективностi IE4 термт окупностi становить 2,18 року, економiя електроенерги протягом розрахункового 20^чного термту експлуатаци складае 268 МВт • год, що в грошовому вираженн становить 41110 €. При тих же умовах замн електродвигуна класу енергоефективностi IE2 на електродвигун класу енергоефективностi IE3 дозволить досягти економи електроенерги протягом розрахункового термту експлуатацп 88 МВт год, що становить в грошовому вираженш 13500 €, i термт окупностi е 5,11 року. Таким чином, в статтi показано, що незважаючи на быьш високу початкову варткть, вибiр електродвигуна класу енергоефективностi IE4 быьш вигiдний з економiчноi точки зору. Бiбл. 27, табл. 4, рис. 1. Ключовi слова: ввдцентровий насос, енергоефектившсть, клас енергоефективноси, асинхронний електродвигун, дросельне регулювання, енергозбереження, життевий цикл, термш окупность
Цель. Сравнительный анализ расчетов энергопотребления, затрат на электроэнергию в течение жизненного цикла и сроков окупаемости насосной установки с 2-полюсными асинхронными электродвигателями мощностью 90 кВт различных классов энергоэффективности, питающимися напрямую от электрической сети. Методика Рассматриваемые режимы работы соответствовали типовому циклу работы, характерному для насосных установок с приблизительно постоянным расходом 75-110 % от номинального. Расчет основывался на паспортных данных насоса и электродвигателей, которые в свою очередь основаны на экспериментальных данных производителей. Результат В статье произведен расчеты энергопотребления, затрат на электроэнергию и сроков окупаемости насосной установки с 2-полюсными асинхронными электродвигателями мощностью 90 кВт, питающимися напрямую от электрической сети. Рассмотрено применение электродвигателей с классами энергоэффективности IE2, IE3 и IE4. Практическое значение. Показано, что в случае замены электродвигателя класса энергоэффективности IE2 в связи с плановой модернизацией электродвигателем класса энергоэффективности IE4 срок окупаемости для электродвигателя класса энергоэффективности IE4 составляет 2,18 года, экономия электроэнергии в течение расчетного 20-летнего срока эксплуатации составляет 268 МВтч, что в денежном выражении составляет 41110 €. При тех же условиях замена электродвигателя класса энергоэффективности IE2 на электродвигатель класса энергоэффективности IE3 позволит достичь экономии электроэнергии в течение расчетного срока эксплуатации 88 МВт ч, что составляет в денежном выражении 13500 €, и срока окупаемости 5,11 года. Таким образом, в статье показано, что, несмотря на более высокую начальную стоимость, выбор электродвигателя класса энергоэффективности IE4 более выгоден с экономической точки зрения. Библ. 27, табл. 4, рис. 1. Ключевые слова: центробежный насос, энергоэффективность, класс энергоэффективности, асинхронный электродвигатель, дроссельное регулирование, энергосбережение, жизненный цикл, срок окупаемости.
Introduction. In the world and, in particular, in the European Union, work has long and consistently been carried out to increase the energy efficiency of household appliances, industrial equipment and technological
processes. An important part of it is the establishment of energy efficiency classes for electric motors, both powered directly from the electrical network [1], and operating as part of a variable frequency drive (VFD) [2].
© V.V. Goman, V.A. Prakht, V.M. Kazakbaev, V.A. Dmitrievskii, E.A. Valeev, A.S. Paramonov
This is due to the fact that according to the research [3], electric motors consume 46 % of the electricity generated in the world, and the share of electricity consumption by electric motors in industry is about 70 %.
In accordance with the EU regulation [4] of 2009, with the addition of 2014, from January 1, 2017 all electric motors with power from 0.75 to 375 kW, with the exception of those specified in the Standard, must have an energy efficiency class of at least IE3 or IE2, if they are used as part of a VFD. In 2019, the requirements for the energy efficiency of electric motors were updated in the new EU regulation [5], according to which the scope of application of the requirements was expanded and the timing of the introduction of more stringent requirements was determined. So, in [5] it is indicated that from July 1, 2021 2-, 4-, 6-, 8-pole electric motors with power from 0.75 to 1000 kW, with the exception of those specified in the Standard, must have an energy efficiency class of at least IE3. From July 1, 2023 2, 4, 6-pole electric motors from 75 to 200 kW inclusive must have an energy efficiency class of at least IE4 [5]. In the USA, Switzerland, Turkey, Canada, Mexico, South Korea, Singapore, Japan, Saudi Arabia, Brazil, Taiwan and a number of other countries, the use of electric motors with an energy efficiency class of at least IE3 is mandatory [6].
The relevance of the work. According to a European Commission report [3], pumping systems account for almost 22 % of the energy consumed by electric motors worldwide. Therefore, studying the possibilities of increasing the energy efficiency of pumping units is an urgent task.
Centrifugal pumps often do not require a wide control range, as well as high starting torque and speed. Therefore, induction electric motors (IMs), operating directly from the electrical network, are widely used in the drives of the mechanisms mentioned above. In this case, the regulation of the performance of the pumps is carried out using valves (throttle control), by means of a controlled change in the characteristics of the hydraulic network. It is known that due to the high costs of frequency converters, not only pumps are characterized by the use of electric motors powered directly from the electrical network. For example, according to the European Commission [1], the share of VFD was about 30 % for Germany, and about 20 % for Switzerland, according to the study described in [7].
Increasing the energy efficiency of a pumping unit is possible due to changes in the hydraulic network on which the unit operates, the use of VFDs, optimization and distribution of loads (in the case of parallel pumping units), as well as due to the proper selection of unit elements, in particular the use of higher energy efficiency class electric motors [8]. A large number of articles [9-12] are devoted to the issues of reducing the energy consumption of pumping units by using electric motors of different operating principles of higher energy efficiency classes. However, in all of the above-mentioned articles [9-12], a method of regulating pump performance using a VFD is considered. This article discusses the use of electric motors with a higher energy efficiency class, as the most relevant way to improve the energy efficiency of pumps with throttle control.
Note that the classification of electric motors for energy efficiency in the regulatory documents [1, 5] is based only on the efficiency in the nominal operating mode, i.e. at rated shaft power, and does not take into account the efficiency of electric motors at a load different from the rated load, which is more or less characteristic of electric motors as part of pumping units. So, for circulating pumps with power up to 2.5 kW operating mainly with variable flow rate according to [13-15], the relative operating time in the nominal mode does not exceed 6 %.
For water pumps, according to [16], standard operating modes with flaw rate of 75 %, 100 % and 110 % of the nominal flow rate are adopted, and the requirements for energy efficiency in these modes are presented. In [14, 15], a typical operating cycle for these modes is given, typical for pumping systems with an approximately constant flow rate. This profile assumes operation 25 % of the time at 75 % flow, 50 % of the time at nominal flow rate and 25 % of the time at 110 %.
Literature review. In [17], a pump unit with nominal power of 2.2 kW operating at a variable flow rate was analyzed. Line-start permanent magnet synchronous motors and IMs with energy efficiency classes IE3 and IE4 were considered. Annual electricity consumption, annual electricity costs, share of life cycle costs determined by the cost of electricity and annual energy savings in kind and in monetary terms when choosing an electric motor were calculated. However, the calculation of the payback period was not made, since the main goal of the article was to show that the choice of an electric motor only according to the energy efficiency class, which is assigned according to the efficiency at the rated load, does not lead to the minimum energy consumption when operating a pumping unit with a variable flow rate according to the typical operating cycle given in [13].
In the article [18], the analysis of the same indicators was carried out for a pumping unit operating at an approximately constant flow rate, with power of 11 kW with two IMs of energy efficiency classes IE1 and IE2, and the payback periods of technical solutions for replacing an electric motor of class IE1 with an electric motor of class IE2 were calculated. However, it should be noted that replacing the IE1 energy efficiency class with IE2 electric motors is relevant only in some countries. For example, in the countries of the Eurasian Economic Union (Russia, Kazakhstan, Belarus, Kyrgyzstan, Armenia), the legislation of which in the field of energy efficiency [19] does not prohibit the use of electric motors of the IE1 class until September 1, 2021.
Thus, as the review of literature sources shows, a comparative analysis of energy consumption and economic indicators of operation of electric motors of energy efficiency classes IE2, IE3, IE4 in pumping units of medium and high power with throttle regulation and approximately constant flow rate has not been previously carried out.
The goal of the work is a comparative analysis of energy consumption and payback periods of a pumping unit using 2-pole IMs of energy efficiency classes IE2 [20], IE3 [21] and IE4 [22] of power of 90 kW from one manufacturer, powered directly from the mains, for a
typical cycle of operation, typical for an approximately constant flow rate according to [14, 15].
Initial data and calculation methods. For the calculation, the data of the pump Grundfos NB 65315/308 AF2ABAQE - 97836805 [23] with rated power PRATE = 90 kW and rated speed nRATE = 2980 rpm are used. Pump data are given in Table 1, where QBEP is the flow rate at the best efficient point (BEP) and HBEP is the pump pressure at the BEP.
Table 1
Pump passport data
Parameter Value
Type NB 65-315/308
Prate, w 90 000
n, rpm 2980
Qbep, m3/h 182
Hbep, m 120.6
Efficiency, % 73.8
. /
100 125 Q mäh
The graphs of the main characteristics of the pump (dependence of pressure, power consumption and efficiency on flow) are shown in Fig. 1.
taking into account year-round and round-the-clock operation, was determined as
3 ( t \
Ed.m.= 365 • tz.^\PLl.m • -L. . (2)
i=1 V ^ J
where tE is the total operating time taken equal to 24 h and tL is the operating time in each mode.
Electricity cost (€) at tariff GT = € 0.188 / kWh for industrial consumers in Germany in the second half of 2019 [24] was determined by the formula
C = e •GT (3)
^y.m ^y.m ^L • v-v
The annual cost savings in electricity were calculated as
>y.31 = Cy.3 _ Cy.1; >y.32 = Cy.3 _ Cy.2; >y. 21 = Cy.2 _ Cy.1. (4)
Taking into account that the life cycle of pumping units according to the data [25, 26] is about 15-20 years, for the calculations the service life was assumed n = 20 years. The electricity costs were calculated over the life cycle of the pumping unit, since the total cost of the life cycle of a pumping unit is mainly the cost of consumed electricity (at least more than 50-60 %) [25, 26]. The net present value (NPV) of the life cycle, determined by the cost of electricity consumed, was calculated as
CLCCen.m = Cy.J (1 + (y - p))", (5)
where y is the interest rate (taken equal to 0.04) and p is the expected annual inflation (taken equal to 0.02) [25, 26].
The difference in electricity costs during the life cycle of the m-th IM relative to the existing IM was determined as
ACLCCen.3m = CLCCen.3 — CLCCen.m. (6)
In the case of replacing the existing IM of the IE2 energy efficiency class with an IE4 or IE3 IM, the payback period Tm of the m-th IM was determined as
Tm Ciic.m / >y.3m. (7)
where CLc.m is the initial cost of the considered electric motors, which are given in Table 4 according to [27].
Results of calculations and their discussion. Table 2 shows the results of calculating the pump operating modes.
Table 2
Results of calculating the pump operating modes
b
Fig. 1. Interpolated pump characteristics and reference points from catalog data: a) Q-H characteristic and power consumption versus flow rate; b) dependence of pump efficiency on flow
The active power of the m-th IM in the L-th operating mode consumed from the electrical network was calculated according to (1) taking into account the interpolated values of the efficiency of electric motors nM.L.m and the mechanical power Pmech.im for modes corresponding to a typical cycle of operation, similar to the approach used in work [17]
P1.i.m Pmech.i.m / nM.i.m. (1)
The annual energy consumption for each IM in the considered typical operating cycle of the pumping unit,
Number of 1 2 3
modes (i)
Q„ % 75 100 110
Qi, m3/h 136.5 182.0 200.2
Hpumv.i, m 132.6 120.6 113.9
'Htrumv' i' % 71.3 73.8 72.7
Pmech.i, ^^ 69176 81045 85471
Pmech• i, % 76.86 90.05 94.97
Table 3 shows the efficiency values of electric motors according to the catalog for loads of 50 %, 75 % and 100 %, as well as for each operating mode of the pump in accordance with the considered typical operating cycle.
The calculation results using (1)-(7) are shown in Table 4. If an IE2 electric motor in an existing pumping unit is replaced by an IE4 electric motor, the energy savings over the design life are 268 MWh, which is € 41,100 in monetary terms, and the payback period is 2.18 years. In case of replacement with an electric motor of the energy efficiency class IE3, the energy savings during the
a
Table 3
Initial and interpolated efficiency values of electric motors
m Electric motor type, IE class Efficiency according to catalog data, % at load
50 % 75 % 100 %
1 IM WEG W22, IE4 95.5 96.2 96.5
2 IM WEG W22, IE3 94.3 95.2 95.2
3 IM WEG W22, IE2 94.0 94.6 94.6
m Electric motor type, IE class Interpolated values of efficiency nM.i.m, % in operating modes
1 2 3
1 IM WEG W22, IE4 96.27 96.43 96.46
2 IM WEG W22, IE3 95.20 95.20 95.20
3 IM WEG W22, IE2 94.60 94.60 94.60
Table 4
Results of calculating energy consumption and electrical energy savings
m 1 2 3
Electric motor type, IE class Afl WEG W22, IE4 Afl WEG W22, IE3 Afl WEG W22, IE2
Ev.m, MWh 719.5 728.5 732.9
Cvm, thousand € 135.27 136.96 137.78
Sv.3m, € 2513.4 824.8 0
CLccen.m, thousand € 2211.9 2239.5 2253.0
ACLccen.3m, thousand € 41.1 13.5 0
C € 5486 4220 0
Tm, years 2.18 5.11 -
design life are 88 MWh, which is € 13,500 in monetary terms, the payback period is 5.11 years. Thus, for the considered conditions, it is advisable to modernize the pumping unit by replacing the electric motor of the IE2 energy efficiency class. Here, despite the higher cost, the use of an electric motor of the energy efficiency class IE4 will provide a significantly shorter payback period than the use of an electric motor of the class IE3.
Conclusions. In the work, calculations of electricity consumption and cost indicators of energy savings for induction electric motors of IE2, IE3, IE4 classes were made, in the case if they are used in a pumping unit operating with flow rate varying within 75-110 % of the nominal one. A comparison was made of the payback periods and electrical energy costs throughout the life cycle for the case of replacing the electric motor in connection with a planned modernization. The payback period for replacing an IE2 motor with an IE4 motor is 2.18 years. Here, the payback period in case of replacement of an electric motor of the energy efficiency class IE2 with an electric motor of the energy efficiency class IE3 is much longer and amounts to 5.11 years. Thus, the choice of an IE4 motor is more cost-effective when upgrading, even though its cost is 30 % higher than that of an IE3 motor. It should be noted that such a technical solution will be especially relevant in light of the requirements of the document [5], according to which in the European Union the use of IE4 class electric motors for powers above 75 kW is mandatory from July 1, 2023.
Acknowledgment. The work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (through the basic part of the government mandate, Project No. FEUZ-2020-0060).
Conflict of interests. The authors declare no conflicts of interest.
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Received 04.10.2020 Accepted 10.12.2020 Published 25.02.2021
V.V. Goman1, Ph.D., V.A. Prakht1, Ph.D., V.M. Kazakbaev2, Ph.D., V.A. Dmitrievskii1, Ph.D., E.A. Valeev1, Student, A.S. ParamonovStudent,
1 Nizhny Tagil Technological Institute (branch) of Ural Federal University,
59, Krasnogvardeiskaia Str., Nizhny Tagil,
Sverdlovsk Region, 622013, Russia,
e-mail: [email protected], [email protected]
2 Ural Federal University,
19, Mira Str., Ekaterinburg, 620002, Russia,
e-mail: [email protected], [email protected],
[email protected], [email protected]
How to cite this article:
Goman V.V., Prakht V.A., Kazakbaev V.M., Dmitrievskii V.A., Valeev E.A., Paramonov A.S. Analysis of the payback period of a modernized pump unit with induction electric motors of advanced energy efficiency classes. Electrical Engineering & Electromechanics, 2021, no. 1, pp. 15-19. doi: 10.20998/2074-272X.2021.1.03.
