Technical and economic considerations for the application of permanent magnet brushless motors in evaporative water coolers

Document Type : Research Note

Authors

1 Department of Electrical and Computer Engineering, University of Kashan, Kashan, P.O. Box 8731753153, Iran

2 Arman Energy Company, Block 287, South Taavon Blvd., Toos Industrial Town, Mashhad, Iran

Abstract

Evaporative coolers due to their low cost are used in hot and dry regions of many countries especially in Iran. Conventional evaporative coolers use single-phase induction motors (SPIMs). But the benefits of these motors are very low, and their substitution with high efficient electrical motors is considered by industrial parties. In this paper, the details of using the brushless motor in the application of evaporative cooler are presented. A 1/2 hp brushless motor and drive are designed and built. This motor- drive is tested by a dynamometer and standard testing equipment. Also, for the approval of this motor-drive, a 5000 m3/h direct evaporative water cooler equipped with this motor is examined under the airflow rate test in the reference laboratory. The results obtained in both tests are compared with the test results of a typical SPIM. The results verify an increase of at least 60% for energy efficiency compared to evaporative coolers equipped with SPIM. Moreover, a new control scheme based on power control instead of speed control is proposed to stabilize the outlet airflow rate. The results indicate that use of brushless motors in this application can offer considerable energy saving, and helps to protect environment.

Keywords


References
1. Sojdei, F., Eslami, M., and Say , N. Potential of
energy conservation in the industry of Iran", ECEEE
Industrial Summer Study Proceedings, pp. 323{330
(2014).
2. Sadeghzadeh, S.M., Zare, M., and Akbari, H. Economic
technological assessment of energy consumption
optimization in three-phase electromotors in the industry
sector", 5th National Energy Conference (in
Persian), Tehran, Iran, pp. 1{9 (2005).
3. Caetano, R.G.D., Pontes, M.G.S.R., Costa, V.L.L.,
Pontes, R.S.T., and Neto, C.C. Energy eciency
electric motor systems: Motor replacement analysis-A
case study", Simposio Brasileiro de Sistemas Eletricos
(SBSE), Rio de Janeiro, Brazil, pp. 1{6 (2018).
4. Lee, K., Rugge, R., and Yang, B. Energy saving
HVAC system modeling and closed loop control in
industrial and commercial adjustable speed drives",
IEEE Energy Conversion Congress and Exposition
(ECCE), Pittsburgh, USA, pp. 1286{1292 (2014).
5. Ferreira, F.J.T.E. and Almeida, A.T.D. Overview on
energy saving opportunities in electric motor driven
systems - Part 1 system eciency improvement",
IEEE/IAS 52nd Industrial and Commercial Power
Systems Technical Conference (I & CPS), Detroit,
USA, pp. 1{8 (2016).
6. Binder, A. Potentials for energy saving with modern
drive technology-a survey", International Symposium
on Power Electronics, Electrical Drives, Automation
and Motion, Anacapri, Italy, pp. 90{95 (2008).
7. Kerdsup, B. and Kreuawan, S. Design of synchronous
reluctance motors with IE4 energy eciency standard
competitive to BLDC motors used for blowers in air
conditioners", IEEE International Electric Machines
and Drives Conference (IEMDC), Miami, USA, pp. 1{
6 (2017).
8. Persson, E., Kulatunga, A., and Sundararajan, R.
The challenges of using variable-speed motor drives
A. Halvaei Niasar et al./Scientia Iranica, Transactions D: Computer Science & ... 27 (2020) 3204{3217 3217
in appliance applications", Electrical Insulation Conference
and Electrical Manufacturing Expo, Nashville,
USA, pp. 453{458 (2007).
9. Wang, H. and Leng, J. Summary on development
of permanent magnet synchronous motor", Chinese
Control and Decision Conference (CCDC), Shenyang,
China, pp. 689{693 (2018).
10. Rathikrindi, K.S., Paramasivam, S., and Sandeep,
L. Energy saving opportunities through variable frequency
drive for commercial air conditioners", 4th
International Conference on Electrical Energy Systems
(ICEES), Tamil Nadu, India, pp. 338{340 (2018).
11. Pullaguram, D., Mishra, S., and Banerjee, S. Standalone
BLDC based solar air cooler with MPPT
tracking for improved eciency", IEEE 7th Power
India International Conference (PIICON), Rajasthan.
India, pp. 1{5 (2016).
12. Krishnan, A.A., Ajith, P.R., Ashwin, K., Deepak,
S., and Pillai, N.S. Sensorless operation of brushless
DC motor drive designed for air conditioners",
International Conference on Innovations in Electrical,
Electronics, Instrumentation and Media Technology
(ICEEIMT), Coimbatore, India, pp. 71{74 (2017).
13. The Iranian National Standard, Rotating Electrical
Machines-Speci cation and Criteria for Energy Consumption
and Energy Labeling Instruction of BLDC
Motors, INSO 3772-30-1-3 (2017).
14. Kamalakannan, D., Mariappan, V., and Ramanathan,
N. Energy ecient appliances in a residential building",
International Conference on Sustainable Green
Buildings and Communities (SGBC), Chennai, India,
pp. 1{6 (2016).
15. Dalcalia, A. and Akbaba, M. Optimum pole arc
o set in permanent magnet synchronous generators for
obtaining lowest voltage harmonics", Scientia Iranica,
Trans. D: Computer Science & Engineering and Electrical
Engineering, 24(6), pp. 3223{3230 (2017).
16. Arehpanah, M. and Kashe, H. Cogging torque reduction
of interior permanent magnet synchronous motor
(IPMSM)", Scientia Iranica, Trans. D: Computer Science
& Engineering and Electrical Engineering, 25(3),
pp. 1471{1477 (2018).
17. Halvaei Niasar, A., Vahedi, A., and Moghbelli, H.
Low cost sensorless control of four-switch, brushless
DC motor drive with direct back EMF detection",
Journal of Zhejiang University, Science-A (JZUS),
10(2), pp. 201{208 (2009).
18. Halvaei Niasar, A., Ahmadi, M., and Edjtahed, S.H.
Sensorless control of non-sinusoidal permanent magnet
brushless motor using selective torque harmonic
elimination control method based on full-order sliding
mode observer", Advances in Power Electronics Journal,
2016, Article ID 9358604, pp. 1{13 (2016).
19. ASHRAE, Standard 133-2015 - Method of Testing Direct
Evaporative Air Coolers, (ANSI Approved) (2015).