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Plate spacing is one of variable that influences plate heat exchanger (PHE) design as a condenser in Organic Rankine Cycle (ORC) system. The rises of plate spacing have effects to channel cross sectional area, channel velocity, equivalent diameter, and Reynold number at hot and cold fluid sides in PHE. Those parameters affect the total heat transfer area and total pressure drop that influence the PHE condenser performance. This paper investigated the detail effect of the plate spacing increments in the final total heat transfer area and total pressure drop design result. The plate spacing in design calculation method is varied and the other independent variables are assumed to be constant. The design was conducted by calculating condenser capacity at both sides and both zones, estimating overall heat transfer coefficient, and calculating heat transfer area and plate film coefficient. Analysis continued by calculating overall heat transfer coefficient that has small percent of error with the estimated overall heat transfer coefficient, calculating pressure drop, total plate number and total heat transfer area. The result of calculation shows that the rises of plate spacing increase the total heat transfer area and decrease the cold and hot fluid total pressure drop. The rises of plate spacing increase channel cross sectional area and equivalent diameter, and decrease channel velocity and Reynold number at zone 1 (without phase change) and zone 2 (with phase change). Therefore, the increment of heat transfer areas is unpreferable and the decrement of pressure drops is preferable.

This paper presents the electricity power potency estimation from hot spring in Indonesia with temperature 70-80°C using Organic Rankine Cycle (ORC). ORC is a system that able to generate electricity with a low heat source temperature, making it suitable to be used to generate electricity with hot spring as heat source. Organic fluid is used as working fluid in the system. Temperature and volume flow rate of the hot spring is used as the data. The regions to be analyzed are area that has hot springs temperature between 70-80°C. The cold water temperature to be used in the analysis was assumed 5°C lower than ambient temperature. R227ea was chosen as working fluid in the system. The analysis begins by calculating hot spring mass flow rate to determine heat input. Analysis was continued by calculating heat output. End of the analysis are determiningturbine power and thermal efficiency. Results of the analysis indicate that Lompio -1 is the area that has the highest electricity potential compared to other areas with 130.13 kW turbine power and thermal efficiency of 5.71%. Areas that have the lowest electricity potential is Kambahan with 1.14 kW turbine power and 5.63% thermal efficiency.

Regenerative organic Rankine cycle (RORC) can be used to improve organic Rankine cycle (ORC) performance. This paper presents a comparison of a single (SSRORC) and double stage regenerative organic Rankine cycle (DSRORC) using a medium grade heat source. Performance for each system is estimated using the law of thermodynamics I and II through energy and exergy balance. Solar thermal is used as the heat source using therminol 55 as a working fluid, and R141b is used as the organic working fluid. The initial data for the analysis are heat source with 200°C of temperature, and 100 L/min of volume flow rate. Analysis begins by calculating energy input to determine organic working fluid mass flow rate, and continued by calculating energy loss, turbine power and pump power consumption to determine net power output and thermal efficiency. Exergy analysis begins by calculating exergy input to determine exergy efficiency. Exergy loss, exergy destruction at the turbine, pump and feed heater is calculated to complete the calculation. Energy estimation result shows that DSRORC determines better net power output and thermal efficiency for 7.9% than SSRORC, as well as exergy estimation, DSRORC determines higher exergy efficiency for 7.69%. ©2019. CBIORE-IJRED. All rights reserved

ABSTRAKKasus balita gizi kurang (BGM) balita di Kecamatan Cempaka Putih, masih tinggi meskipun telah dilakukan berbagai macam intervensi. Penelitian ini bertujuan untuk meneliti hubungan antara pengetahuan, sikap, dan perilaku ibu dengan peningkatan berat badan balita. Jenis penelitian ini adalah penelitian kuantitatif analitik observasional yang dilakukan dengan pendekatan cross-sectional, uji statistik yang digunakan adalah Chi-Square. Populasi studi (sampel) terdiri atas 60 balita dengan gizi kurang. Penelitian dilakukan pada kecamatan cempaka putih dari bulan mei-juli. Variabel terikat yang diteliti adalah kenaikan berat badan balita, yang diukur Berat Badan Menurut Umur (Weight For Age) 1-5 tahun. Variabel independen adalah pengetahuan, sikap, dan perilaku ibu tentangkenaikan berat badan balita. Alat ukur untuk variabel bebas adalah kuesioner. Variabel perancu yang diperhitungkan mencakup umur ibu, pendidikan ibu, penghasilan keluarga. Hubungan antara variabel yang diteliti serta pengaruh variabel perancu dianalisis dengan model analisis regresi logistik model awal dan akhir, dengan menggunakan program SPSS v.24.0. Hasil penelitian menunjukkan terdapat hubungan yang bermakna antara kenaikan berat badan balita dengan pengetahuan dan sikap ibu. (pengetahuan OR 4,705,CI95% 1,132; sikap or 4,705, ci95% 1,132) dan tidak adanya hubungan yang bermakna antara perilaku ibu dengan kenaikan berat badan balita (perilaku OR 1,133, CI95% 0,128). di samping itu pendidikan ibu dan penghasilan keluarga berhubungan dengan status kenaikan berat badan balita. Variabel lainnya seperti usia ibu tidak menunjukkan hubungan dengan kenaikan berat badan balita. Penelitian ini menyimpulkan, pengetahuan dan sikap ibu mempunyai hubungan yang bermakna dengan kenaikan berat badan balita. Penelitian ini menyarankan, apapun tingkat pendidikan dan pekerjaan ibu, pengetahuan, sikap, dan perilaku ibu tentang masalah gizi anak balita perlu ditingkatkan untuk meningkatkan berat badan balita.

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<p class="E-JOURNALAbstractBody">Kemasan plastik banyak digunakan pada industri makanan dan minuman di Indonesia karena praktis dan mudah. Namun<ins cite="mailto:Asus" datetime="2020-06-10T07:49">,</ins> disisi lain ini merupakan bencana bagi lingkungan karena plastik merupakan bahan yang sulit terurai (<em>nondegradable</em>). <em>Edible film</em> merupakan salah satu alternatif yang dapat dipertimbangkan untuk menggantikan kemasan plastik. Tujuan dari penelitian ini adalah memanfaatkan kitosan dari limbah cangkang rajungan dan pektin dari limbah kulit pisang kepok sebagai bahan baku pembuatan <em>edible film</em>. Kitosan diperoleh dari proses <em>degreasing</em>, deproteinasi, demineralisasi dan deasetilasi cangkang rajungan. Pektin diperoleh dari proses hidrolisis kulit pisang kepok. <em>Edible film</em> yang berbasis kitosan dan pektin dibuat melalui proses <em>blending</em> dengan ratio (K:P) 100:0; 60:40; 50:50: 40:60 dan 0:100. Analisis karakteristik yang dilakukan meliputi warna, transparan, ketebalan, kelarutan dalam air, laju transmisi uap air (WVTR), kadar air, <em>swelling degree</em>, biodegradabilitas, dan aktivitas antimikroba. Hasil penelitian menunjukkan <em>edible film</em> kitosan dan pektin yang paling optimal adalah ratio 50:50.</p>