Kebisingan yaitu merupakan salah satu permasalahan terhadap kesehatan pekerja, yang selalu muncul pada dunia industri di Indonesia yang menggunakan  tenaga penggerak motor Disel. Dalam berkembangnya dunia industri pembangkit daya dibidang kelistrikan yang  di sebabkan semakin banyaknya tenaga kerja yang terpapar terhadap kebisingan yang intensitas yang  semakin tingginya maka dapat menyebabkan pada gangguan fisiologis terhadap pekerja dan penyebab terganggunya pendengaran pekerja.Kebisingan merupakan salah satu faktor bahaya terhadap kesehatan pekerja dan dapat merusak sel saraf terhadap pendengaran pekerja, di mana dapat mempengaruhi pendengaran yaitu melalui“gelombang longitudinal yang dapat menimbulkan getaran dari sumber kebisingan di mana bunyi dan gelombang  yang akan merambat melalui udara atau penghantar lainnya. Sehubungan dengan hitungan korelasi maka terdapat nilai koefisien korelasi setiap item yang akan ditunjukan bagaimana derajat validitas item tersebut. dan untuk menentukan kelayakan item maka kuesioner digunakan untuk dilakukan uji signifikansi koefisien korelasi. Item dapat dikatakan valid saat nilai signifikansi lebih dari 0.05 (>0.05) lalu kemudian disamakan dengan r tabel dan menurut jumlah responden (N). Berdasarkan hasil penelitian yang telah dijelaskan sebelumnya, maka dapat disimpukan bahwa secara persial hubungan alat pelindung Diri berpengaruh positif dan signifikan pendengaran bagi petugas/operator di PLTD Kelapa Lima Merauke.

Sago is a native plant of Indonesia, with an area of ​​about 1.128 million ha or 51.3% of the world's sago area. Potential areas for producing sago (Metroxylon sp.) in Indonesia include Riau, South Sulawesi, Southeast Sulawesi, North Sulawesi, Maluku and Papua, where about 90% of the sago area in Indonesia is in Papua. From studies conducted by non-governmental organizations (NGOs) such as WWF which in May 2014 conducted various studies on the utilization of agricultural wastes that can still be used as alternative energy sources, which of course must be studied further. The study must of course be tested in the laboratory. Studies in the laboratory involve ultimate testing based on chemical content tests and proximation studies (thermal properties of fuel). This study must be carried out with the aim of knowing whether the sample to be used as fuel is feasible or not. This research is to do laboratory testing to determine the chemical composition of briquettes, thermal properties. The 60, 80 mesh size briquettes are molded in a cylindrical shape. The results of printing sago dregs charcoal briquettes consist of 60 mesh and 80 mesh, where the two briquettes have the following dimensions for a grain size of 60 mesh, briquette diameter b = 44.90 mm = 4,490 cm, briquette mass = 0.17 gr, briquette height = 69.80 mm = 6.980 cm. Then for mesh 80, - Diameter of briquettes b = 44.90 mm = 4.490 cm, mass of briquettes = 220.078 gr, height of briquettes = 69.80 mm = 6.980 cm. The results of the proximate analysis test produce: for mesh 60, among others, moisture 13.08%,; volatile matters 26.18%,; fixed carbon 27.88%, and calorific value above 4013 kcal/kg, while for mesh 80, among others, moisture 13.36%; volatile matters 23.52%,; fixed carbon 29.86%, and the calorific value of 4007 kcal/kg. The density of mesh 80 is 2,769 gr/cm3, mesh 60 is 1,998 gr/cm3, the combustion efficiency of mesh 60 is 5.070% and mesh 80 is 3.58%.

The drying process plays an important role in the preservation of agricultural products. To this day, the drying process of rice grains harvested by the farmers in Semangga District, Merauke Regency, has always used sunlight. However, during rainy season, the farmers cannot dry their grains, and if such thing happens for a long time, it will cause decayed grains. The drying characteristics of a material are necessary in designing the dryers in use. The method used in this research was the design of grain dryers, which took the form of heating oven, by utilizing heat from the residual exhaust gas of diesel engine. The exhaust gas coming out of the exhaust manifold would be flowed through the heating pipe in the oven heating chamber, then through the convective heat transfer process, followed by conductive heat transfer, and then the heat flow conduction would be transmitted to the drying chamber. The objective of this research was to design grain dryers by using Diesel engine's residual exhaust gas, and to calculate the efficiency of grain dryer using heat transfer analysis. The bulk gas temperature in the exhaust gas section for hot fluid in the pipe is 371.55 K at a motor rotation of 2400 rpm, with the flow rate of the incoming exhaust gas heat mass of 0.01798031 kJ/s. The velocity of incoming exhaust gas mass is 36.75 kg/s, with the comprehensive heat transfer coefficient on the inlets of 92.7334404 W/ m 2 .oC. The heat transfer in the air section/ fluid section in the inner pipe is 351.1351 K, while the convective heat transfer coefficient in exit pipe is 8.010580984 W/m 2 . o C, thus obtaining Comprehensive heat transfer of 40.2312698 W/ m 2 . o C. The logarithmic mean temperature difference (LMTD) in the evaporator is 35.69590751 o C with total heat transfer area of 084178 m 2 . With 2400 rpm motor rotation, the total heat transfer at the heat exchanger, which is the usable maximum heat, is equal to 0.226296111 kW; while the effectiveness of heat exchanger is at 60.95%. The energy used to evaporate the water and the amount of convective heat transfer from dry air to the product are 0.03696 kW, while the amount of air energy used is 0.05150 kW, obtaining the efficiency of the drying machine at 71%.

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