Judul: Pengaruh Konfigurasi Aliran Udara Terhadap Kinerja Sistem Pengering Mikrokogenerasi
Abstrak: Mikrokogenerasi merupakan sistem yang dapat memproduksi dua bentuk energi secara bersamaan. Energi yang paling umum diproduksi menggunakan sistem kogenerasi adalah energi listrik dan energi termal. Penelitian ini bertujuan untuk menentukan parameter-parameter yang mempengaruhi kinerja alat pengering mikrokogenerasi, serta menganalisa kinerja pengering mikrokogenerasi. Penelitian dilakukan dengan memvariasikan bukaan aliran udara pada saluran udara masuk genset dan saluran udara masuk heat exchanger, menggunakan plat besi berlubang. Selain itu, pengujian juga dilakukan dengan adanya perbedaan suhu lingkungan dan penggunaan heater. Hasil menunjukkan bahwa perbedaan konfigurasi aliran udara berpengaruh pada efisiensi energi total yang berada pada rentang 60 hingga 87%. Data menunjukkan udara yang dihasilkan alat pengering mikrokogenerasi berpotensi untuk mengeringkan gabah dan rempah, yaitu dengan suhu berada pada rentang 32 hingga 46°C, laju aliran massa udara keluaran blower pada rentang 0.737 hingga 0.974 kg/s dan persentase panas yang berasal dari dinding genset lebih dari 90%. Hasil penelitian juga menunjukkan bahwa dengan lebih banyak menyalurkan udara melalui saluran heat exchanger menghasilkan efisiensi energi yang lebih baik, yaitu pada rentang 73 hingga 87%, sedangkan dengan laju aliran udara yang lebih rendah pada saluran heat exchanger menghasilkan efisiensi energi pada rentang 60 hingga 72%. Selain itu, data juga menunjukkan bahwa adanya perbedaan suhu lingkungan tidak berpengaruh banyak pada efisiensi energi total., Micro-cogeneration is a system that can produce two forms of energy simultaneously. The most common energies produced using cogeneration systems are electricity and thermal energy. This study aims to determine the parameters that affect the performance of the micro-cogeneration dryer and to analyze the performance of the micro-cogeneration dryer so as to produce the optimum drying air. The research was conducted by varying the airflow openings at the inlet of the generator and the air inlet of the heat exchanger using a perforated iron plate. In addition, testing was also carried out with differences in ambient temperature and the use of heaters. The results show that different airflow configurations affect the total energy efficiency which is in the range of 60 to 87%. The data shows that the air produced by the micro-cogeneration dryer has the potential to dry grain and spices, with temperatures in the range of 32 to 46°C, the mass flow rate of the blower output air in the range of 0.737 to 0.974 kg/s and the percentage of heat coming from the generator wall is more than 90%. The results also show that by channeling more air through the heat exchanger channel, it produces better energy efficiency, which is in the range of 73 to 87%, while with a lower air flow rate in the heat exchanger channel, it produces energy efficiency in the range of 60 to 72%. . In addition, the data also shows that the difference in ambient temperature does not have much effect on the total energy efficiency.
Keyword: generator set, mikro-kogenerasi, panas buang, penukar panas

Judul: Quality Analysis and Energy Consumption of Grain Fluidization Drying with Tempering
Abstrak: Pengeringan mekanis yang biasa digunakan untuk pengeringan gabah adalah menggunakan alat pengering fluidized bed dryer dengan suhu yang tinggi. Pengeringan dengan suhu tinggi biasanya tidak dilakukan hingga kadar air ±14%bb sehingga diperlukan pengeringan FBD menggunakan variasi suhu hingga mencapai kadar air ±14%bb yang ditambah dengan adanya perlakuan proses tempering di tengah pengeringan. Penelitian ini bertujuan menganalisis konsumsi energi spesifik dan analisis mutu pengeringan fluidisasi gabah dengan beberapa variasi perlakuan suhu dan tempering. Perhitungan kadar air metode oven yang dilakukan dari pengambilan sampel 2 kali ulangan relatif seragam karena nilai yang dihasilkan dari kedua sampel tidak jauh berbeda. Konsumsi energi total perlakuan kombinasi 1, perlakuan kombinasi 2, dan perlakuan kombinasi 3 berturut-turut menghasilkan nilai rata-rata sebesar 3,72 kWh, 4,67 kWh, dan 3,70 kWh. Konsumsi energi panas spesifik perlakuan kombinasi 1, perlakuan kombinasi 2, dan perlakuan kombinasi 3 berturut-turut menghasilkan nilai rata-rata sebesar 35,61 MJ / kg air yang diuapkan, 41,94 MJ / kg air yang diuapkan, dan 26,31 MJ / kg air yang diuapkan. Konsumsi energi spesifik perlakuan kombinasi 1, perlakuan kombinasi 2, dan perlakuan kombinasi 3 berturut-turut menghasilkan nilai rata-rata sebesar 39,34 MJ / kg air yang diuapkan, 50,32 MJ / kg air yang diuapkan, dan 38,84 MJ / kg air yang diuapkan. Analisis mutu yang dilakukan dari penggilingan gabah perlakuan kombinasi 1 menghasilkan rata-rata beras kepala sebesar 81,8% dan 81,4% serta rata-rata beras menir sebesar 2,2% dan 2,5%. Analisis mutu perlakuan kombinasi 2 menghasilkan rata-rata beras kepala sebesar 71,5% dan 66,2% serta rata-rata beras menir sebesar 3,5% dan 3,5%. Analisis mutu perlakuan kombinasi 3 menghasilkan rata-rata beras kepala sebesar 92,3% dan 91,5% serta rata-rata beras menir sebesar 0,6% dan 0,5%., Mechanical drying commonly used for grain drying is to use a fluidized bed dryer with a high temperature. Drying with high temperatures is usually not carried out until the water content is ±14%wb, so it is necessary to dry FBD using temperature variations until it reaches a water content of ±14%wb plus the tempering process treatment in the middle of drying. This study aims to analyze the total energy consumption and quality of grain fluidization drying quality with several variations of temperature and tempering treatment. The calculation of the moisture content of the oven method which was carried out from sampling 2 times was relatively uniform because the values obtained from the two samples were not much different. The total energy consumption of combination I treatment, combination II treatments, and combination III treatments, respectively resulted in an average value of 3.72 kWh, 4.67 kWh, and 3.70 kWh. The specific heat energy consumption of combination I treatment, combination II treatments, and combination III treatments, respectively resulted in an average value of 35.61 MJ / kg of evaporated water, 41.94 MJ / kg of evaporated water, and 26.31 MJ / kg of evaporated water. The specific energy consumption of combination I treatment, combination II treatments, and combination III treatments, respectively resulted in an average value of 39.34 MJ / kg of evaporated water, 50.32 MJ / kg of evaporated water, and 38.84 MJ / kg of evaporated water. Quality analysis carried out from
Keyword: fluidization, grain, drying, tempering, fluidization, grain, drying, tempering

Judul: Lejeuneaceae Subfamily Ptychanthoideae (Hepaticae) in  West Java
Abstrak: Subfamily Ptychanthoideae of the family Lejeuneaceae (Hepaticae) in West Java is still poorly known. Publications on this subfamily are out of dated and written in the 19th or early of 20th century. The last taxonomic treatment of Ptychanthoideae of West Java was in 1933, many species names have changed since then. Studies on Ptychanthoideae of West Java are urgently needed. Studies on the Ptychanthoideae were based on the specimens collected from West Java. A total number of 361 of specimens deposited in the Herbarium Bogoriense (BO), Herbarium Biotrop (BIOT), Gottingen Herbarium (GOET) and Bangi Herbarium (UKMB) were examined, those are old and several recent specimens collected in West Java. Recent collections were made from Telaga Warna, Ciater, Gunung Halimun Salak National Park, Cibodas Botanical Garden, Bodogol Education Center and Conservation (Gunung Gede Pangrango National Park), University of Indonesia Campus Depok, including several collections from Banten Province. Twenty four species of Lejeuneaceae subfamily Ptychanthoideae are known from West Java, belonging to 8 genera namely Acrolejeunea (Spruce) Schiffn. (2 species), Archilejeunea (Spruce) Schiffn. (1 species), Lopholejeunea (Spruce) Schiffn. (10 species), Mastigolejeunea (Spruce) Schiffn. (3 species), Ptychanthus Nees (1 species), Schiffneriolejeunea Verd. (1 species), Spruceanthus Verd. (2 species) and Thysananthus Lindenb. (4 species). Two new records of Ptychanthoideae: Mastigolejeunea indica Steph. and Thysananthus minor Verdoorn are reported for Java. A determination key to the species is presented including their descriptions and illustrations.
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