A preliminary design of pump as turbine and induction motor as generator for energy recovery :: A study case of Bribin water distribution network, Gunungkidul District, Yogyakarta Special Province Indonesia

SILALAHI, David Firnando, Dr.-Ing. Ir. Kusnanto

2009 | Tesis | S2 Magister Sistem Teknik

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This study deals with the effort to recover energy in water distribution system. Generally the available energy, in the form of pressure, is dissipated by installing a valve. Conventionally, this energy potency can be recovered by using small turbine. Using pump as turbine (PAT) instead of turbine is another alternative and was chosen in this study. To be easy to use, the mechanical output power produced by the PAT was proposed to be converted to electricity using a generator, in this study motor induction as generator (IMAG) is proposed to be used. The energy potency in Bribin water distribution network exists mainly in pipe sections between reservoirs Kaligoro to reservoir R4, Kaligoro to R5, and Kaligoro to R8. Main distribution line between Kaligoro to R4 is selected as the location of PAT application. In this section exist water discharge (Q) 14.47 l/s and net head (H) 23 m. To recover the available energy, PAT was selected using method which was developed by Singh. Using boundary condition Q 14 l/s and H 23 m, the Etanorm 50- 200 pump with impeller diameter 199 mm was found to be suitable. It gives BEP 73.5% in operating speed of 1400 rpm and produces output mechanical power 2 kW. This mechanical power is converted into electricity power using IMAG. The IMAG was selected using method which was developed by Chapallaz. A squirrel cage three phase induction motor from ABB with rating 3 kW suits the boundary condition. The IMAG operating speed is 1570 rpm with efficiency 88%. It is expected to produce 1.9 kW electrical powers. Overall efficiency of the PAT-IMAG system is 63.4%.

Kata Kunci : To recover energy,Bribin water distribution system,Pump as turbine (PAT)