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All Journal Matrix : Jurnal Manajemen Teknologi dan Informatika Bhakti Persada Jurnal Aplikasi IPTEKS International Journal of Glocal Tourism JAMETECH

I Nyoman Suamir

Jurusan Teknik Mesin, Politeknik Negeri Bali

Author-ID : 3952417

Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences Transportation

Published : 9 Documents Claim Missing Document

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Analisis perbandingan berbagai sistem AC komersial pada aplikasi gedung hotel I Nyoman Suamir; I Wayan Temaja; I Putu Eka Indra Yana
Journal of Applied Mechanical Engineering and Green Technology Vol. 2 No. 3 (2021): November 2021
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Sistem AC adalah utilitas energi-signifikan terbesar dari bangunan hotel. Oleh karena itu, ada potensi luar biasa untuk meningkatkan efisiensi keseluruhan sistem AC di gedung hotel dengan melakukan optimasi baik dari aspek pemilihan sistem dan operasionalnya. Paper ini menyajikan evaluasi alternatif berbagai sistem AC yang dapat diterapkan untuk hotel bintang lima. Hotel ini merupakan resor dan vila dengan beban puncak pendinginan sebesar 2400 TR (ton of refrigeration). Aspek utama yang menjadi basis evaluasi dalam paper ini adalah kinerja energi sistem AC mencakup COP, konsumsi daya, dan konsumsi energi per tahun. Hasil evaluasi menunjukkan bahwa sistem AC sentral dengan diversity factor yang relatif lebih baik memberikan fleksibilitas dalam menetapkan kapasitas sistem yang terpasang bisa lebih kecil dibandingkan dengan beban pendinginan puncak dari gedung hotel. Lebih spesifik ditemukan bahwa AC jenis water cooled chiller memiliki COP yang tinggi dibandingkan dengan sistem AC lainnya. Dikombinasikan dengan keunggulan kapasitas yang terpasang juga kecil, maka konsumsi energi tahunan untuk AC jenis water cooled chiller juga sangat unggul dengan penghematan energi lebih dari 50% dibandingkan dengan sistem AC jenis WCP dan VRV. Modular air cooled chiller juga ditemukan memiliki keunggulan kinerja energi setelah water cooled chiller. Hasil evaluasi ini dapat memberikan alternatif bagi pemilik hotel, konsultan dan kontraktor gedung dalam menetapkan sistem AC yang paling sesuai untuk diterapkan.

Kajian termodinamik kinerja AC split: studi kasus pada bangunan pendidikan dengan menerapkan program komputer I Wayan Adi Subagia; I Dewa Made Susila; Ketut Bangse; I Nyoman Suamir
Journal of Applied Mechanical Engineering and Green Technology Vol. 3 No. 1 (2022): March 2022
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

This paper presents a thermodynamic study on energy performance of a split AC system with R-32 for the application of educational buildings at the Bali State Polytechnic. The study was conducted using a standalone computer program U-CoolS V.1.12 which was developed on the EES (Engineering Equation Solver) V11,334 program. A thermodynamic model was developed and validated using data from the technical specifications of various types of split AC. Thermodynamic studies were carried out based on variations in ambient temperature in the Bali Region. The effect of two operating parameters of a split AC system, namely the condensing temperature in the condenser and the evaporation temperature of the refrigerant in the evaporator, on the compressor performance and energy performance of the AC system is simulated. Thermodynamic simulation results show the strong influence of condensing temperature and evaporation temperature on compressor performance and overall energy performance of the split AC system. It was found that for 1 °C increase in condensing temperature, the compressor power increased quite significantly around 2.1%, the cooling capacity of the split AC system decreased by 1.8%, COP and EER also decreased by 3.9%. Meanwhile, for 1 °C increase in evaporation temperature, it was found an increase in compressor power consumption of around 0.31%, an increase in cooling capacity of 4.4% and an increase in COP and EER of 4.1%. The results of this thermodynamic study also show that the split AC system performance using R-32 refrigerant has a very good COP range from 3.27 to 5.95 with the implication that R-32 refrigerant has the potential to be a refrigerant for a split AC system.

Perilaku supercooling pada proses solidification material perubahan fasa berbasis air I Made Rasta; I Nyoman Suamir; Adi Winarta; I Wayan Adi Subagia; I Dewa Made Susila
Journal of Applied Mechanical Engineering and Green Technology Vol. 3 No. 2 (2022): July 2022
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/jametech.v3i2.71-77

Thermal energy storage based on phase change material (PCM) as an energy storage material is considered a promising technology to meet future energy needs due to its low cost and high storage capacity under isothermal conditions. Thermal energy storage is an inevitable component of intermittent use of renewable energy technology, due to its significant role in improving efficiency and Quality of Service (QoS). At present, one of the main researchers in such systems is to improve the efficiency of heat exchangers and heat carriers. Therefore, studying the thermal behaviour and thermophysical properties of heat storage is very important. Supercooling is a thermophysical property of PCM that is problematic in thermal storage applications and is a challenge in technical applications. Supercooling of phase change materials (PCM) during the process of changing from liquid to solid is a major problem in thermal energy storage, which reduces energy efficiency and exacerbates energy wastage. This study focuses on the supercooling characteristics of PCM under heterogeneous nucleation, which provides a new idea to investigate the effect of nucleating agents on the supercooling rate of aqueous solutions. Understanding, predicting and, where possible, preventing, or at least reducing, supercooling is of particular importance for latent heat thermal energy storage systems, as the temperature differences within them must be small to achieve higher efficiencies. Water is the most popular PCM today, because it has good characteristics, but has a weakness, namely high supercooling. Various methods have been sought and developed to control the behaviour of supercooling fluids. The most economical and efficient method for reducing or eliminating supercooling is the addition of a nucleating agent. Various PCM samples, namely propylene glycol solution in water, were made in various percentages (10/90, 20/80 and 30/70) with the aim of reducing supercooling of water. The samples made were tested by the T-history method. The results showed that the water supercooling decreased with the increase in the percentage of propylene glycol solution in water, from 10 degrees to 6, 4, 2 degrees respectively, making it suitable for cooling applications.

Co-Authors Adi Winarta Cening Ardina I Dewa Made Susila I G.K. Abasana I Gusti Agung Putu Sri Mahadewi I K Widana I Ketut Bangse I Ketut Suarta I Made Rasta I Made Rasta I Nyoman Gede Baliarta I Putu Astawa I Putu Eka Indra Yana I Wayan Adi Subagia I Wayan Temaja Ida Ayu Elistyawati Made Ery Arsana Made Rasta Nyoman Mastiani Nadra Putu Wijaya Sunu Tjok Gde Raka Sukawati

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