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I Dewa Made Susila
Program Studi Teknik Pendingin Dan Tata Udara, Politeknik Negeri Bali, Jl. Kampus, Kuta Selatan, Badung, Bali 80364, Indonesia
Automotive Engineering Energy Engineering Mechanical Engineering

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Penentuan ukuran pipa kapiler dengan program aplikasi CapSel Versi 1.0 pada AC trainer unit jenis ekspansi langsung dengan R-410A I Dewa Made Susila; I Wayan Adi Subagia; I Made Rasta
Journal of Applied Mechanical Engineering and Green Technology Vol. 3 No. 1 (2022): March 2022
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (659.751 KB) | DOI: 10.31940/jametech.v3i1.31-35

Abstract

The use of air conditioning system currently mostly uses the vapor compression cycle. One such air conditioning machine is a direct expansion type AC. In this type of air conditioner, the air is directly cooled by the refrigerant. Cold air is flowed through the air duct to be entered into the room to be cooled. The refrigerant used is R-410A which does not contain chlorine so it does not cause depletion of the ozone layer because it has an ODP = 0. This direct expansion unit trainer uses an expansion device in the form of a capillary tube and an external equalizer type TXV. To determine the size of the capillary tube on the trainer unit, the direct expansion type uses the CapSel version 1.0 application program. By using the input data for refrigerant type R-134A, refrigeration capacity 2,637.6 Watt (9000 BTU/hour), evaporation temperature 5 °C condensation temperature 47 °C, and return gas temperature 12 °C, the recommended capillary pipe size data is obtained, namely the length of the pipe. capillary 1.47 m with an inner diameter of 2.50 mm. The test was carried out by varying the velocity of the air leaving the airways at high speed (22.3 ft/s) and at low speed (7.9 ft/s). The refrigerant temperature and pressure data are measured at 4 measurement points and the measurement of the electric current entering the system. After processing the data and entering it into the Coolpack application program, the average COP and EER in the low speed position produce a higher price than the high speed position.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1059.523 KB) | DOI: 10.31940/jametech.v3i1.36-42

Abstract

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.
Penggunaan refrigeran hidrokarbon MC-134 pada mesin freezer untuk pedagang es krim keliling I Dewa Made Susila; Daud Simon Anakottapary; I Wayan Adi Subagia; Putu Wijaya Sunu; I Nengah Ardita
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.v3i2.48-52

Abstract

This study aims to determine the performance and energy consumption of the freezer machine for mobile ice cream sellers using the environmentally friendly MC134 refrigerant with a compressor capacity of 1/10 HP. This research was conducted using an experimental method. The size of the capillary tube is determined using the Cap Tube 1.0.8.0 application program. The evaporator used is a bare tube type that is wrapped around an ice cream box. The test is carried out by measuring the temperature and pressure of the refrigerant, the temperature in the ice cream box, as well as the electric current and voltage in the system. The results of the analysis of performance and energy consumption will also be compared if the system uses HFC134a refrigerant. From the test results obtained the optimum mass that is filled into the system for MC134 refrigerant is 155 grams and the optimum mass for 134a refrigerant is 202 grams. The use of MC134 refrigerant is more efficient by 23.3%. The COP for MC134 refrigerant is 3.1 while the COP for 134a refrigerant is 2.7. The energy consumption for MC134 is 67.8 kJ while for R134a is 83 kJ.
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

Abstract

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 Daud Simon Anakottapary I Ketut Bangse I Made Rasta I Made Rasta I Nengah Ardita I Nyoman Suamir I Wayan Adi Subagia Putu Wijaya Sunu