You are viewing an obsolete version of the DU website which is no longer supported by the Administrators. Visit The New DU.
Democratic Underground Latest Greatest Lobby Journals Search Options Help Login

Reply #31: While waves conitnue to break waves the energy output won't continually be 100% peak power. [View All]

Printer-friendly format Printer-friendly format
Printer-friendly format Email this thread to a friend
Printer-friendly format Bookmark this thread
This topic is archived.
Home » Discuss » Topic Forums » Environment/Energy Donate to DU
Statistical Donating Member (1000+ posts) Send PM | Profile | Ignore Fri Mar-18-11 09:02 PM
Response to Reply #27
31. While waves conitnue to break waves the energy output won't continually be 100% peak power.
There is variability to waves, just like there is variability to wind. Most windfarms are built in areas where wind blows the overwhelming majority of the time but despite that capacity factor in the 20%-30% range is common. Even wind is blowing it won't produce 100% peak power each time. Even if they did time for maintenance, and repairs reduces capacity factor.

Granted it is only a single data point but this wave farm achieves a 20% capacity factor (150KW average annual output over 750KW peak power)

Developed by the Scottish company Pelamis Wave Power, the Pelamis machine is made up of connected sections which flex and bend relative to one another as waves run along the structure. This motion is resisted by hydraulic rams which pump high pressure oil through hydraulic motors which in turn drive electrical generators. The three machines which made up the Aguadoura Wave Park were each rated at a peak output of 750kW, giving an installed peak capacity of 2.25MW, enough to meet the average electricity demand of more than 1,500 Portuguese homes.<5> The average output from a Pelamis machine will depend on the wave resource in a particular area. The higher the resource the higher the average output. According to information on the Pelamis web site it appears that the average power output for a Pelamis wave machine is about 150kW. <6>

For the sake of argument lets assume this system has 50% higher capacity factor - 0.30
150kW peak * 0.30 capacity factor * 24 hours * 365 = 394 MWh of annual production.

Total US electrical demand is roughly 4,400 TWh. Thats 4,400,000 GWh or 4,400,000,000 MWh
4,400,000,000 MWh / 394 MWh per unit = ~ 11.2 million units.

To supply 20% of electical demand would be 11.2 * 0.2 = 2,240,000 units.

Printer Friendly | Permalink |  | Top
  -Possibly the "perfect" green energy source? GSLevel9  Mar-18-11 02:11 PM   #0 
  - 150 kW of peak output is a bit on the skinny side.  denem   Mar-18-11 02:13 PM   #1 
  - should be soon...  GSLevel9   Mar-18-11 02:15 PM   #2 
  - plz check out the related articles:  GSLevel9   Mar-18-11 02:18 PM   #3 
  - Because 150Kw isn't enough for a village in Maine?  DCKit   Mar-18-11 02:46 PM   #5 
     - well,  Confusious   Mar-18-11 05:49 PM   #10 
        - Did someone suggest this be installed and operational by Monday morning?  Wilms   Mar-18-11 06:49 PM   #12 
        - Did you not read the response I was replying to?  Confusious   Mar-18-11 07:20 PM   #15 
           - Perhaps. What I was responding to was your comment.  Wilms   Mar-18-11 07:38 PM   #18 
              - No, I advocate alternatives  Confusious   Mar-18-11 07:58 PM   #20 
                 - Ah. Then I do indeed apologize. And we agree.  Wilms   Mar-18-11 08:09 PM   #22 
                    - How did they survive? Simple they have plenty of spare natural gas turbine capacity.  Statistical   Mar-18-11 08:12 PM   #23 
                    - Then there's a vote for dimming the lights in Tokyo at night.  Wilms   Mar-18-11 08:15 PM   #26 
                    - A shift in peoples views doesn't happen overnight  Confusious   Mar-18-11 08:41 PM   #28 
        - Wrong location delete  Wilms   Mar-18-11 07:37 PM   #17 
        - So it's ~400K units if we're only looking to replace the 20% from nuclear.  DCKit   Mar-18-11 07:39 PM   #19 
           - Where do you get 400K from it is 1.4 million.  Statistical   Mar-18-11 08:13 PM   #25 
           - You don't think 400Gw is a generous 20% share of 150Gw? Check your math.  DCKit   Mar-18-11 08:28 PM   #27 
              - where do you get 150GW from  Confusious   Mar-18-11 08:50 PM   #29 
              - Capacity factor for renewables is much lower.  Statistical   Mar-18-11 09:03 PM   #32 
              - While waves conitnue to break waves the energy output won't continually be 100% peak power.  Statistical   Mar-18-11 09:02 PM   #31 
           - The number was 1.4 million not 400k or 400 thousand.  Confusious   Mar-18-11 08:56 PM   #30 
  - How much does 150 kW support?  aikoaiko   Mar-18-11 02:32 PM   #4 
  - Enough to power 600, 55", energy hogging plasma TVs...  DCKit   Mar-18-11 02:51 PM   #6 
  - This comes from the DOE  Kennah   Mar-18-11 04:10 PM   #8 
     - installed base of power for the United States is  Confusious   Mar-18-11 05:58 PM   #11 
  - I have always been in favor of wave power but after this tsunami I  jwirr   Mar-18-11 03:30 PM   #7 
  - A tsunami may destroy wind generators, but they won't leak nuclear waste!  diane in sf   Mar-18-11 04:30 PM   #9 
     - Yes and that is the point. I lived on the North shore of Lake Superior.  jwirr   Mar-18-11 06:59 PM   #13 
        - what part of 1500 microwaves dont you get?  backwoodsbob   Mar-18-11 07:19 PM   #14 
           - I have always thought that there is not going to be any one size fits  jwirr   Mar-18-11 07:28 PM   #16 
           - Hey Bob, do you really run your microwave all the time?  DCKit   Mar-18-11 08:13 PM   #24 
  - Wave power is a great idea  txlibdem   Mar-18-11 08:04 PM   #21 
  - I would favor wind over wave.  Statistical   Mar-18-11 09:17 PM   #33 
  - Here's a planned wave park the company is working on in Oregon  OnlinePoker   Mar-19-11 12:05 PM   #34 

Home » Discuss » Topic Forums » Environment/Energy Donate to DU

Powered by DCForum+ Version 1.1 Copyright 1997-2002
Software has been extensively modified by the DU administrators

Important Notices: By participating on this discussion board, visitors agree to abide by the rules outlined on our Rules page. Messages posted on the Democratic Underground Discussion Forums are the opinions of the individuals who post them, and do not necessarily represent the opinions of Democratic Underground, LLC.

Home  |  Discussion Forums  |  Journals |  Store  |  Donate

About DU  |  Contact Us  |  Privacy Policy

Got a message for Democratic Underground? Click here to send us a message.

© 2001 - 2011 Democratic Underground, LLC