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Abstrak :
Menara Pendingin adalah suatu unit yang dapat membantu melakukan perpindahan kalor dimana kalor tersebut sudah tidak dibutuhkan lagi. Dalam operasi menara pendingin, ada beberapa faktor yang dapat dijadikan tinjauan dalam mengukur performa dari menara pendingin. Banyaknya bakteri di dalam menara pendingin menyebabkan presipitasi kerak yang dapat mengganggu efektivitas thermal dari menara pendingin dikarenakan kerak-kerak tersebut akan menghambat laju perpindahan kalor karena mempunyai resistansi thermal yang tinggi. Ada beberapa cara untuk mengurangi laju pertumbuhan dari kerak, salah satunya adalah ozonasi. Ozonasi adalah injeksi ozon pada air pendingin menara pendingin untuk mengurangi potensi dari presipitasi kerak yang akan meningkatkan performa dari menara pendingin. Penelitian ini bertujuan untuk mengetahui karakteristik efek ozonasi terharap performa dari menara pendingin dan kualitas air pendingin pada menara pendingin sistem tertutup. Metode yang digunakan untuk menguji kualitas air adalah pengujian dengan alat ukur yang dicelupkan setiap harinya dan uji laboratorium seperti AAS, Titrimetric, Gravimetrik, dan Spectrophotometric. Hasil yang didapat pada penelitian ini adalah karakterisitik laju performa setiap harinya dan laju kualitas air setiap harinya maupun saat sebelum dan sesudah ozonasi. Hasil dari nilai efektivitas yang didapat adalah 0.12 % untuk nilai terkecil dan 8.74 % untuk nilai terbesar. Ozonasi terbukti dapat meningkatkan kualitas air menara pendingin tetapi belum terbukti dapat meningkatkan performa atau efektivitas menara pendingin untuk jangka waktu ozonasi selama 15 hari. ......Cooling tower is a unit or system that used for heat transfer process where the heat is not useful anymore. There is several factor in the cooling tower operations that can observed for cooling tower performance. The large amount of bacteria on cooling tower become potential of scale precipitation that can decrease the cooling tower thermal effectivity because of the scale will act as inhibitor for heat transfer rate since the scale has high value of thermal resistance. There are several method for reducing scale precipitation growth rate, one of them is ozonation or ozone injection method. The ozone will injected to the cooling water to reduce the scale precipitation growth rate that can decreases the cooling tower performance. This research intends to find the characteristic of ozonation effect from cooling tower performance and water quality. The method for water quality checking are AAS method, Titrimetric, Gravimetric, and Spectrophotometric. The output of this research are characteristic of cooling tower performance each day and rate of water quality before and after ozonation and each day. The effectiveness value results obtained in this research was 0.12 % for the lowest value and 8.74 % for the highest value. Ozonation has been proven to improve water quality rate of cooling towers but has not been proven to improve the performance or effectiveness of cooling towers for an ozonation period of 15 days.

Abstrak :
Proses perlakuan panas dalam industri penarikan kawat bertujuan untuk memulihkan struktur sarta menghilangkan pengerasan keija yang terjadi akibat deformasi plastis. Jenis perlakuan panas pada kawat perlitik (baja karbon tinggi) adalah proses "Patenting". Proses patenting dalam peneiitian ini ada dua jenis yakni Lead Patenting (LP) dan Fluidized-beds Patenting (FDP). Hasil penelitian menunjukkan lead patenting memiliki kekuatan, kekerasan serta struktur mikro yang lebih baik dibanding dengan tiuidized-beds patenting. Sedangkan kondisi patenting untuk mendapatkan kekuatan tertinggi pada kawat SWRS-B2B terjadi pada temperatur 525 ºC dengan waktu tahan 1 menit. Kondisi ini berlaku untuk lead patenting maupun fluidized-bed patenting. Seiain itu struktur mikro (fasa perlit) hasil presses patenting temyata lebih halus dibanding proses aniling biasa.

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ABSTRAK
Cooling Degree Days ( CDD ) merupakan salah satu cara untuk mengestimasi kebutuhan energi melalui fluktuasi temperatur udara luar. Studi ini menghitung CDD berdasarkan base temperature 20, 22 dan 24°C dalam rentang waktu 2001-2010, perhitungan menggunakan data dry blub temperature udara luar dari stasiun BMKG Halim dan Tanjung Priok. Metode perhitungan menggunakan metode Mean Degree Hours untuk Tanjung Priok dan Mean daily temperature untuk Halim. Hasil perhitungan, analisis hubungan antara CDD dengan Energi, serta perbandingan antara CDD pada daerah Tanjung Priok, Halim, Kemayoran, Cengkareng, dan Pondok Betung disajikan dalam skripsi ini.

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ABSTRACT
Cooling Degree Days is one of the ways to estimate the energy requirement through the outside air temperature fluctuations. This studies is to calculate CDD with temperature base 20, 22, and 24°C in Tanjung Priok and Halim area with range 2001-2010 year. This calculation use outdoor dry bulb temperature which data take from BMKG Tanjung Priok and Halim. Method of calculation using mean degree hours method for Tanjung Priok and mean daily temperature method for Halim. The result of this calculation, CDD-energy relation analysis, and comparison between CDD in Tanjung Priok, Halim, Kemayoran, Pondok Betung, and Cengkareng presented in this paper.

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Conditioning of flue gas of coal fired boiler of PLTU was carried out prior to irradition processing using electron beam machine. Flue gas containing of SOx and NOx can demage the environment so that flue gas must be treated before release to environment....

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fish will experience a degradation process that leads to the decay process after its capture and death. This loss of quality is caused by bacterial activity,enzyme activity, or o combination of those factors. during the effort of decreasing the temperature by using cooling techniques, fish fishery business. In this study, the experiment will be conducted to determine the effect of different cooling media for quality fish. Cooling medium used is : (a) 99% salt and 1% water (b) 98% salt and 2% water (c)97% salt and 3% fresh and sea water. All media are included in the coolbox . Addition of salt can reduce the temperature of coling media coolbox below 0 derajatC. Ther higher the salt concentration in water, the lower temperatures in the coolbox and the higher salt concentration so that increasing the coolbox temperature will be faster. For sea water temperature is achieved at temperatures as low as 3- derajat C and quickly going up . Viewed from the best cooling media is a mixture of fresh water ice 99% + salt 1% protein content compared with most other cooling medium that is equal to 11.8 %.

Abstrak :
This study investigated the performance of electrocoagulation using iron and aluminum electrodes for removing silica, calcium and magnesium from cooling tower blowdown and reverse osmosis reject waters. Experiments were conducted at both the bench and pilot scales to determine the levels of target species removal as a function of the coadulant dose. At the bench scale, aluminium removed he taget compounds from cooling tower blowdown and reverse osmosis reject more efficiently than iron.