# hydro power

 Register Blogs Members List Search Today's Posts Mark Forums Read

 November 1, 2005, 22:57 hydro power #1 owen smith Guest   Posts: n/a id like to produce power out of a 6.5m wide stream trouble is there isnt much fall and can only dam it to 2m heigh could anyone advise me, if thats enough to turn a 100 kw turbine

 November 2, 2005, 20:34 Re: hydro power #2 Bak_Flow Guest   Posts: n/a Hi Owen, interesting question, although you don't need CFD to do the calculation. First law of thermodynamics says: W_out = mdot_in(h + 1/2 V^2 + gz)_in - mdot_out(h + 1/2V^2 + gz)out With: mdot_in = mdot_out h_in = h_out V_in = V_out Efficiency = 100% W_out = mdot*gz in metric units: W_out[W] = mdot[Kg/s]*9.81[m/s^2]*2[m] W_out[W] = mdot[Kg/s]*19.6[J/Kg] So for 100[kW] you would need to pass 5000[Kg/s] through your turbine. That is about 5 m^3 of water/s. That seems like a lot for a 6.5[m] wide stream. Can you measure the current flow? Check out the web there are some resources on backyard power-set ups and such that may have some useful info. Good Luck, Bak_Flow

 November 3, 2005, 01:14 Re: hydro power #3 owen smith Guest   Posts: n/a thanks BaK_Flow. understood 5 m3 could you explain calculation abreivations please.would daming river come into your calculations, more pressure less nozzle size to accomadate 5m3s. actualy river is 30m wide was only going to harness 6.5m, could channel more water if needed. at the moment average flow would be approx 10m3s.apprieciate your input. thanks owen.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post hani OpenFOAM 0 February 29, 2008 09:12 moona mohammadi Main CFD Forum 0 May 25, 2006 10:24 moona mohammadi FLUENT 0 May 25, 2006 00:51 moona mohammadi Main CFD Forum 0 May 25, 2006 00:47 Mukkarum FLUENT 4 May 19, 2003 07:57

All times are GMT -4. The time now is 04:43.