Hasil Pencarian  ::  Simpan CSV :: Kembali

"Alternative energy, nowadays, becomes more necessary than fossil fuels which might be destructing and polluting the earth’s environment. Wind can be one of the most cheap, secure, environment friendly and reliable energy supplies. Building Integrated Wind Turbine (BIWT) is becoming increasingly common as a green building icon and new method of assessing optimal building energy. However, to employ BIWT, it is important to design the building shape and swept area carefully to increase wind velocity. Some of numerous design forms of BIWT will be explained in this paper using CFD (Computational Fluid Dynamics) analysis to find the most effective BIWT design in urban area. This paper will focus on the maximum wind velocity which passes the swept area to get maximum wind power. The result shows that, building energy can be optimized through aerodynamic building design to get the maximum wind power for building energy consumption."

"Sektor rumah tangga adalah konsumen energi terbesar di Indonesia. Instrumen yang menggunakan energi paling besar pada sektor ini adalah sistem penyejuk udara sebagai akibat dari iklim tropis Indonesia yang membuat temperatur udara lebih tinggi daripada temperatur standar kenyamanan termal. Phase change material (PCM) berpotensi mengurangi konsumsi energi dengan menurunkan besar envelope heat transfer rate yang masuk ke dalam bangunan. Pemilihan PCM serta konfigurasi integrasinya dengan material bangunan krusial dalam menentukan performanya. Pemilihan didasarkan pada kondisi iklim tempat pengaplikasian PCM. Penelitian ini akan menguji performa termal beberapa PCM yang diintegrasikan dengan material bangunan bata beton ringan memanfaatkan simulasi numerikal pada peranti lunak EnergyPlus. Integrasi material bangunan bata beton ringan dengan satu jenis PCM bernama RT 35 yang diproduksi oleh Rubitherm Technologies GmbH, menghasilkan reduksi envelope heat gain transfer rate paling baik. Konfigurasi integrasi yang menempatkan PCM pada lapisan tengah material bangunan memiliki performa yang lebih baik jika dibandingkan konfigurasi yang menempatkan PCM pada lapisan luar serta dalam tembok bangunan. Hal tersebut terjadi karena penempatan PCM pada lapisan tengah memberikan perbedaan temperatur PCM yang lebih rendah dengan sekitarnya. Analisis sifat termal terhadap PCM RT 35 dengan ketebalan 20 mm yang ditempatkan pada lapisan tengah menghasilkan peningkatan hambatan termal tembok sebesar 0,141 m2-K/W.

---

Household sector consumes the largest amount of energy compared to other sectors in Indonesia. The most consuming instrument is the air conditioning (AC) system as the tropical climate of Indonesia yields outdoor temperature that is higher than the standardized temperature for thermal comfort. Phase change material (PCM) possesses potential to reduce the employment of energy for the AC system by reducing the total envelope heat transfer rate incorporated into a building through the walls. However, the selection of PCM and its configuration of integration with the building materials are subjected to the climate environment. This study conducted examination of the thermal performance of some PCMs that are integrated with lightweight concrete through numerical simulation using EnergyPlus software. The integration of lightweight concrete with a PCM titled RT 35 manufactured by Rubitherm Technologies GmbH company yield the highest envelope heat gain transfer rate reduction. Meanwhile, the configuration that placed the PCM in the middle layer of the building material performs better than the configurations that placed the PCM on the outer and the inner surface of the wall. This is due to the PCM being imposed to a smaller temperature difference with its surroundings. Analysis of the thermal properties of the 20 mm thick PCM RT 35 that is placed on the middle layer of the walls also yields thermal resistance value of the wall which is 0.141 m2-K/W.

"

"Bangunan studi kasus gudang terdiri dari 3 lantai dengan bentang tipikal 11.4 m (kecuali pada bagian driveway terdapat bentang 17.1 m) dan tinggi antar lantai 11.2 m. Struktur menggunakan beton fc’ 40 MPa dan tulangan baja BjTS 420B. Struktur ini menanggung beban hidup gudang sebesar 25 kN/m2, beban hidup driveway 15 kN/m2, dan atap datar 1 kN/m2. Sementara itu, beban gempa yang diberikan adalah gempa respons spektrum. Bangunan ini berlokasi di Depok dengan kelas situs tanah lunak sehingga termasuk kategori desain seismik D dan memiliki sistem pemikul gaya seismik berupa sistem rangka pemikul momen khusus (SRPMK). Desain struktur bangunan dilakukan dengan dua skema, yaitu struktur Konvensional di mana digunakan pelat dua arah yang menumpu balok sebagai media transfer beban ke kolom dan struktur post-tensioned flat slab (PTFS) di mana digunakan pelat dua arah prategang yang secara langsung menumpu kolom dengan penebalan berupa drop panel. Pada struktur PTFS dilakukan pemisahan sistem penahan gaya gravitasi dan lateral (SGLR). Kolom penahan beban gravitasi saja akan dicek menggunakan prinsip kompatibilitas perpindahan. Struktur PTFS memiliki periode getar, berat seismik, gaya geser dasar, dan maximal story displacement lebih besar dibandingkan struktur konvensional. Volume tulangan (35.355%), beton (1.421%), dan bekisting (26.683%) struktur PTFS lebih kecil dibanding struktur konvensional dengan terdapat penambahan volume untuk strand (100%). Perbedaan biaya terbesar terdapat pada komponen balok, di mana penggunaan post-tensioned flat slab mampu menghemat biaya sebesar 62.712%. Total penghematan yang terjadi adalah sebesar 9.161%.

---

The warehouse case study building consists of 3 floors with a typical span of 11.4 m (except for the driveway section where the span is 17.1 m) and a height between floors of 11.2 m. The structure uses fc' 40 MPa concrete and BjTS 420B steel reinforcement. This structure supports a warehouse live load of 25 kN/m2, a driveway live load of 15 kN/m2, and a flat roof load of 1 kN/m2. The given earthquake load is response spectrum earthquake. This building is located in Depok with a soft soil site class so it is classified as seismic design category D and has a seismic force resisting system in the form of a special moment resisting frame system (SMRFS). The building structure design is carried out using two schemes, namely a Conventional structure where a two-way slab supported by beam as a load transfer medium to the column is used and a post-tensioned flat slab (PTFS) structure where a two-way prestressed slab that directly supported by column with thickening. in the form of a drop panel is used. In the PTFS structure, there is a separated gravity and lateral resisting system (SGLR). Gravity-load-only columns will be checked using the principle of displacement compatibility. PTFS structure has a vibration period, seismic weight, base shear force, and maximum story displacement greater than conventional structure. The volume of reinforcement (35.355%), concrete (1.421%), and formwork (26.683%) for PTFS structure is smaller than conventional structures with strands volume (100%) added in the PTFS structure. The biggest cost difference is in the beam components, where the use of post-tensioned flat slabs can save costs of 62.712%. The total savings that occur are 9.161%."

"Artikel ini membahas mengenai menara-menara masjid kuno di Semarang yang dibangun pada  abad ke 19-20 Masehi. Menara-menara tersebut berada di kawasan-kawasan etnis yang  menunjukkan keragaman kebudayaan hasil dari perkembangan interaksi antar etnis sehingga terciptanya pencampuran budaya. Penelitian ini bertujuan untuk mengetahui variasi bentuk dan gaya bangunan pada setiap komponen menara-menara masjid kuno di Semarang. Metode penelitian ini menggunakan metode penelitian arkeologi Sharer dan Ashmore yang terdiri dari tahapan ; formulasi, implementasi, pengumpulan data, pengolahan data, analisis, interpretasi dan publikasi. Berdasarkan tinjauan arkeologis dan hibriditas, gaya bangunan menara-menara masjid kuno di Semarang dipengaruhi oleh kebudayaan lokal, Eropa, dan Arab.

---

This article discusses the ancient mosque towers in Semarang which were built in 19-20 century AD. The towers are located in ethnic areas shows cultural diversity resulting from the development of inter-ethnic interactions so that creating a mix of cultures. This research aims to determine variations in shape and form the building style of each component of the ancient mosque towers in Semarang. Method This research uses Sharer and Ashmore's archaeological research methods which consist of stages; formulation, implementation, data collection, data processing, analysis, interpretation and publications. Based on archaeological research and hybridity, the building style of the towers Ancient mosques in Semarang are influenced by local, European and Arab cultures."