German engineers have found a greener way of brewing amber nectar.

    Scientists at the Technische Universitaet in Munich （home of the Oktoberfest beer festival） are creating a new brewing process that could cut down on the amount of energy needed to produce beer.

    For more than a hundred years, the brewing process has involved boiling giant kettles to temperatures of upto 160C to boil down 'crude beer' or wort. The scientists say that about 45 per cent of the energy consumed by breweries is used for this process.

    Instead the Bavarian team have adapted an approach using combined heat and power stations, which harness the heat produced during power generation. The technique had already been tried, but on its own it couldn't heat the kettles to the necessary temperature. The new system combines the CHP station with what the TU München scientists call a 'zeolite storage system'.

    This consists of thousands of zeolite spheres, two to three millimetersp in diameter. "These porous pellets are made of silicate minerals and have excellent heat storage properties," the team reports. "One gram of zeolite has an internal surface of about 500 square meters."

    When zeolite that has been soaked in water is heated, the spheres dry up, charging up the system. Once water is added again, the zeolite spheres release heat of up to 250C, according to the researchers.

    On its own, the combined heat and power （CHP） station can achieve temperatures of 90C, but this thermal-chemical process boosts it to the levels needed for brewing.

    Dr Winfried Russ, the project leader, says: "At night a medium-sized brewery needs little energy. In this time we can feed unused heat from the CHP station into the zeolite storage system." When the heat is needed the next day, the brewers can just hit a button and get the heat boost they need."

    The system has been tested using simulations and now real-world tests are underway. Russ is eager to see the results: "We already know that it will work. What we don't know is just how much energy can be saved."

    The technology will be on display at the Drinktec 2009 trade fair in Munich from September 14 to 19.

    德國工程師們發現了一種更為綠色的釀造琥珀色甜美飲料的方法。

    慕尼黑（慕尼黑啤酒節的家園）技術學院的科學家們正在創造一種新的釀造工藝，可以減少生產啤酒所需要的能量。

    一百多年來，老的啤酒釀造工藝涉及到溫度高達 160C 的大型蒸煮釜
， 它們被用來煮濃'粗啤酒'或者麥芽汁。科學家們說，釀酒廠消耗的能量的大約 45% 用於這一過程。

    作zuo為wei替ti代dai，這zhe個ge巴ba伐fa利li亞ya的de小xiao組zu改gai變bian途tu徑jing，利li用yong熱re電dian聯lian產chan的de電dian廠chang

，采cai用yong發fa電dian過guo程cheng中zhong產chan生sheng的de熱re作zuo為wei動dong力li。這zhe項xiang技ji術shu已yi經jing試shi用yong過guo，但dan是shi靠kao它ta本ben身shen不bu能neng把ba大da釜fu加jia熱re到dao所suo需xu的de溫wen度du。新xin的de係xi統tong是shi將jiang CHP（熱電聯合） 電廠與慕尼黑科學家稱之為"沸石貯熱係統"的係統結合起來。

    這樣的係統由成千上萬直徑兩到三毫米的沸石球組成。"這些多孔的球是由矽酸鹽礦物製成的，並且具有優良的貯熱性能
，"該小組報告說。"一克沸石具有大約 500 平方米的內部表麵。"

    根(gen)據(ju)研(yan)究(jiu)人(ren)員(yuan)們(men)的(de)說(shuo)法(fa)，當(dang)在(zai)水(shui)裏(li)浸(jin)泡(pao)過(guo)的(de)沸(fei)石(shi)被(bei)加(jia)熱(re)時(shi)，球(qiu)體(ti)變(bian)幹(gan)，將(jiang)它(ta)們(men)添(tian)加(jia)到(dao)係(xi)統(tong)中(zhong)。再(zai)次(ci)加(jia)水(shui)
，沸(fei)石(shi)球(qiu)釋(shi)放(fang)熱(re)量(liang)
，使(shi)溫(wen)度(du)升(sheng)高(gao)到(dao) 250C.

    熱電聯產（CHP）電廠自身可以達到 90C 的溫度，而這個熱化學過程把它推進，達到釀造所需要的水平。

    這個項目的領導者溫弗裏德 拉斯博士說："在夜裏，一個中等大小的釀酒廠需要一點能量。在這個時候
，我們可以從 CHP 電廠將不使用的熱量提供給沸石貯熱係統。"當在下一天需要熱量的時候，啤酒可以隻按一下按鈕

，就能得到他們所需要的熱量增加。"

    這個係統已經采用模擬仿真測試過，現在正在進行實際測試。拉斯渴望看結果，他說："我們已經知道它會奏效。我們所不知道的是到底能夠節省下來多少能量。"

    這項技術將在慕尼黑從 9 月 14 日到 19 日的 《2009 年 Drinktec（飲料技術）貿易展覽會》上展出。