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).
[PDF]
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.
