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Thread: Energy Requirments

  1. #1
    Join Date
    Jun 2005
    Location
    Australia
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    27

    Smile Energy Requirments

    Looking at making it feasable to recovering energy consumed in the brewhouse. As I am only working in the theoretical stages at present, I need to get some feedback from real life situations.

    My good mate Kunze tells me that I can expect to use around

    170 - 230Mj of thrmal energy per hL (0.8522 bbl) and
    and
    10-14 KwH electrical energy per hL

    Brewery will use steam.

    If any of my fellow brewers can tell me if this is in thier experience is a reasonable assuption please LMK.

    Cheers and upside down beers
    Skippy the Bush kangaroo.

  2. #2
    Join Date
    Oct 2002
    Location
    Tadcaster, Yorkshire, UK
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    1,041
    I've just been looking at this. According to the major equipment suppliers, if you recover the energy from 4 to 4.5 % evaporation, you can preheat the wort from the lauter tun from about 75 C to 92 to 94, dependent upon plant efficiency. If you work out the cost of all the pumps, tanks, heat exchangers, maintenance, space etc, you will probably find the figures don't add up.

    You can also reduce energy consumption by installing vapour recompression plants, but this definitely won't pay for a micro

    If you recover the energy from the hot wort on transfer to the FV, you should get about 1.1 hl hot water at circ 85 C for every hl wort you chill down, dependant upon the cold water temperature and the cols wort out temperature. This is probably worth saving because you can use the water for mashing in, sparging, and CIP

    Cheers
    dick

  3. #3
    Join Date
    Jun 2005
    Location
    Australia
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    Thanks Dick but I am not thinking micro as you are right for the capital employed money would not be returned.

    The real heart of the matter is using between 6 and 12 hL of water to make a hL of beer and burning up a couple of tonne's of coal is not environmentally sustainable in the long term.

    So if I can utilise solar, bio gas, heat recovery and water treatment strategies to become a little bit more enviro friendly I will. But before I can do this I was wondering if anyone can verify that Kunze's figures are grounded in reality(I realise it is also very brewery dependant), so I can aspire to become a little bit nicer to mother earth, so I can have a beer on the polar ice caps whilst watching a David Attenborough documentary about the rainforests.

    Cheers and hippy beers
    Last edited by Beer Guy; 11-13-2006 at 07:38 PM.

  4. #4
    Join Date
    Dec 2003
    Location
    London, United Kingdom
    Posts
    181
    hey,

    if you send me a message with your email address, i can send you an excel spreadsheet that has formulas for industry averages for utility usages. it is extracted from an artical in "The Brewer International" in Oct 2003.

    basic story is, smaller the brewery, higher the use. the figures it gives me (assuming 1000HL production) is

    16.6 kWh/HL for electricity
    205.7 MJ/HL for heat
    10.6 HL/HL for water

    overall, the ranges in Kunze should be fairly accurate, but I would use the higher-end of the range if your operation is small.

    as an alternative, you can also check this website out: http://www.soundbrew.com/ , they have some general info on micro brewing projects with utility usages.

    alex

  5. #5
    Join Date
    Oct 2003
    Location
    Santa Rosa CA USA
    Posts
    963
    Thank you for caring about energy usage beyond just money. An easy energy savings is to run the hot refrigerant from your compressors into water you will heat up (like copper tubing in a hot liquor tank) before returning it to the fan unit on your compressor. The compressor will push it there and back. A little bit more copper, a bit more refrigerant, and you keep the heat you've already made.

  6. #6
    Join Date
    Jul 2005
    Location
    Auburn, WA
    Posts
    217

    Heat recovery coils

    We install many vented coaxial heat exchangers that use the high temp discharge refrigerant to heat water on winery and dairies applications, but haven't sold to many breweries. I think the main reason these are not so common on brewery systems is the fact that was pointed out earlier in this thread, that many breweries will heat this water pretty efficiently via the counter flow Wort heat exchanger.

    These coils need to be "vented" if you are heating potable water. The vented heat exchanger has a buffer between the refrigerant and water. If you develop a leak in one section, it will leak into the buffer or vented section, and not cross contaminate. We are actually able to recover about 50% of the heat that is normally rejected to the outside air, pretty significant.

    There are some things you need to be careful of regarding the installation of these coils, such as; refrigerant oil return, pressure drop, relief valves, etc. If not calculated in, could cause harm to your refrigeration system.

    Jim

  7. #7
    Join Date
    Jun 2003
    Location
    Louisville, KY
    Posts
    995
    Quote Originally Posted by Alex T
    hey,

    if you send me a message with your email address, i can send you an excel spreadsheet that has formulas for industry averages for utility usages. it is extracted from an artical in "The Brewer International" in Oct 2003.

    basic story is, smaller the brewery, higher the use. the figures it gives me (assuming 1000HL production) is

    16.6 kWh/HL for electricity
    205.7 MJ/HL for heat
    10.6 HL/HL for water

    overall, the ranges in Kunze should be fairly accurate, but I would use the higher-end of the range if your operation is small.

    as an alternative, you can also check this website out: http://www.soundbrew.com/ , they have some general info on micro brewing projects with utility usages.

    alex
    You could post the spreadsheets here for all to view.
    Cheers & I'm out!
    David R. Pierce
    NABC & Bank Street Brewhouse
    POB 343
    New Albany, IN 47151

  8. #8
    Join Date
    Dec 2003
    Location
    London, United Kingdom
    Posts
    181
    Hey, board won't let me attach an excel spreadsheet. If anyone wants it, just send me a message with email address.

    Alex

  9. #9
    Join Date
    Jun 2003
    Location
    Louisville, KY
    Posts
    995
    Quote Originally Posted by Alex T
    Hey, board won't let me attach an excel spreadsheet. If anyone wants it, just send me a message with email address.

    Alex
    Wierd. I thought you could post any widely used format.
    Cheers & I'm out!
    David R. Pierce
    NABC & Bank Street Brewhouse
    POB 343
    New Albany, IN 47151

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