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    • ISSN: 1793-821X
    • Frequency: Quarterly (2013-2014); Bimonthly (Since 2015)
    • DOI: 10.18178/JOCET
    • Editor-in-Chief: Prof. Haider F. Abdul Amir
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JOCET 2017 Vol.5(6): 475-479 ISSN: 1793-821X
DOI: 10.18178/JOCET.2017.5.6.419

Development of Nomograph for Sizing a Centrifugal Pump as Turbine for Electric Power Generation

Adornado C. Vergara
Abstract—Three different sizes and brands of non-self-priming Centrifugal Pump (CP) were used in this study. Sizes of CP were as follows: 75 mm x 75 mm, 100 mm x 100 mm and 125 mm x 125 mm. Each Centrifugal Pump as Turbine (CPAT) was individually coupled to the test rig and subjected to variable heads and flow rates. On-site evaluation of 100 mm x 100 mm CPAT was conducted at an existing Micro Hydro Power (MHP) system.
Functional relationships presented in the Nomograph were Actual Discharge of CPAT, Rotational Speed and CPAT Brake Power at different heads. To validate the reliability of the developed Nomograph, data in laboratory testing and on-site testing were compared statistically.
During laboratory testing, regression equations developed from 75 mm x 75 mm, 100 mm x 100 mm and 125 mm x 125 mm between net head (H) and actual discharge (Qa) are Qa = 0.0042H0.2991 with R2 = 0.94, Qa = 0.0065 + 0.0006H – 0.0000002H2 with R2 = 0.98, and Qa = 0.0093H0.3581 with R2 = 1, respectively. Likewise the regression equations between net head (H) and CPATs shaft speed are N = 11.608 + 1.5589H - 0.0119H2 with R2 = 0.98, N = 11.08 + 1.5249H - 0.0043H2 with R2 = 0.95, and N = 10.157H0.3827 and R2 = 0.97, respectively. Similarly, regression equations between net head (H) and CPATs brake power are BPCPAT = 0.0912H1.1392 with R2 = 0.96, BPCPAT = 0.1096H1.2624 with R2 = 0.99, and BPCPAT = 0.022H2 + 0.0248H + 0.4863 with R2 = 0.99, respectively. The values derived from these equations were used in making the Nomograph.
On the other hand, regression equations developed on-site from a 100 mm x 100 mm CPAT between net head (H) and Qa, net head (H) and N, net head (H) and BPCPAT were statistically comparable during laboratory testing and are as follows: Qa = 0.0036H0.5662 with R2 = 0.95, N = -0.0022H2 + 1.335H + 13.044 with R2 = 0.99, and BPCPAT = 0.1173H1.244 with R2 = 0.98. The Nomograph was tested on-site and showed satisfactory performance.

Index Terms—Centrifugal pump as turbine, laboratory and on-site testing, micro hydro power.

A. C. Vergara is with the College of Engineering, Nueva Vizcaya State University, Bayombong, Nueva Vizcaya, 3711 Philippines (e-mail: ador_vergara@yahoo.com).

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Cite:Adornado C. Vergara, "Development of Nomograph for Sizing a Centrifugal Pump as Turbine for Electric Power Generation," Journal of Clean Energy Technologies vol. 5, no. 6, pp. 475-479, 2017.

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