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All Journal IPTEKMA Buletin Udayana Mengabdi Jurnal Energi Dan Manufaktur Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Natural Sciences Engineering and Technology Journal
Hendra Wijaksana
Machine Engineering Study Program, Faculty Of Engineering, Universitas Udayana, Denpasar, Indonesia
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Physics Social Sciences Transportation

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Journal : Natural Sciences Engineering and Technology Journal

 1 
Analysis of the Characteristics of Natural Materials as Adsorbents in Air Conditioning Adsorption Aqsal Raja Bramastha; Made Sucipta; Hendra Wijaksana
Natural Sciences Engineering and Technology Journal Vol. 2 No. 2 (2022): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v2i2.20

Abstract

The use of an air conditioner (AC) increases the use of compressors and electricity supply quite significantly. This will increase global warming and the occurrence of an energy crisis. Referring to this, a cooling system that is more energy-efficient and environmentally friendly is needed. One alternative is to use natural materials as adsorbents in adsorption air conditioning. In this system, changes in humidity levels occur due to the process of absorption of air moisture in each test material in the packed bed. The purpose of this research is to determine the regeneration characteristics of natural materials and activated carbon, as well as their performance against moisture. The characteristics tested also include contact angle test and proximate test. In addition to the type of material, mass variations of 200gr, 400gr, and 600gr are also carried out as well as variations in the combination between materials. The results obtained from the regeneration test 9 times, natural ingredients affect air conditioning. The larger the mass tested, the greater its ability to reduce humidity. In another sense, 600gr activated carbon provides the most optimal performance among other natural materials, both in mass variations and combined variations.
Experimental Study of Permeability Characteristics of Bamboo Betung Activated Carbon as Alternative Pad Material for Direct Evaporative Cooling System I Made Feby Arya Putra; Hendra Wijaksana; I Gede Teddy Prananda Surya
Natural Sciences Engineering and Technology Journal Vol. 3 No. 1 (2023): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v3i1.27

Abstract

The increased growth in the building sector, especially in big cities, has triggered an increase in the need for electrical energy for cooling systems, most of which use compressor-based cooling systems. Direct Evaporative Cooling (DEC) is evaporative that produces cooling by utilizing the latent heat of evaporation of water on the wet surface of the pad material. The pad material must be sufficiently porous to allow the free flow of air through it and must have a large enough wet surface area. This study used carbonized and activated bamboo Betung as a material for the DEC system. The research was conducted to obtain the permeability characteristics of the carbonized bamboo pad material at various temperatures of 400oC, 500oC 600oC, 700oC, and 800oC and then activated at a temperature of 600oC with a holding time of 60 minutes. Based on the results of the research on the permeability characteristics of bamboo Betung activated carbon material, which was carbonized at a temperature of 400oC and activated at a temperature of 600oC with a holding time of 60 minutes (ABR 400) had the highest permeability of 13.6 x 10-15 m2. Meanwhile, the lowest permeability was produced by bamboo Betung material which was carbonized at a temperature of 800oC and activated at an activation temperature of 600oC with a holding time of 60 minutes (ABR 800) which is only 0.56x10-15 m2.
The Effect of Variation in Expansion Valve Capacity on Cooling Performance in Cold Storage Machines I Putu Gede Krisna Mahendra Putra; Hendra Wijaksana; Made Sucipta
Natural Sciences Engineering and Technology Journal Vol. 3 No. 1 (2023): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v3i2.31

Abstract

The rapid development of the food storage industry in Indonesia, especially for basic ingredients, is very influential in the business world, such as the business of supplying food, fresh meat, and vegetables, all of which require a storage device that can maintain the freshness and quality of the food. These various products. One example of such a tool is cold storage. The increasing demand for food products makes suppliers have to meet the great demand for food by increasing the supply of products. With such conditions, many suppliers or owners of cold storage complain that the cooling performance of cold storage is not being achieved as needed. The effect of variations of the three expansion valves shows that the 2.8 TR expansion valve has cooled, whereas the 2.8 TR expansion valve has a higher refrigeration effect, and the compressor work on the 3.7 TR expansion valve and 4.4 TR expansion valve has a significant increase. This can be caused by the increased refrigerant flow so that the compressor makes a greater effort to compress the refrigerant, and from that, the system workability (COP) has decreased. The effect of the variation of the three expansion valves shows that the expansion valve 4.4 TR has a faster decrease in room temperature, where the initial room temperature is considered uniform. The 4.4 TR expansion valve opens the valve gap earlier, and the refrigerant flow that flows is greater when the engine is started so that heat is absorbed by the evaporator faster.
Analysis of Heat Recovery System Performance Using a Serpentine-Type Heat Exchanger on Water Heater with Fins Number Variation I Gusti Agung Gede Kusuma Artha; Made Sucipta; Hendra Wijaksana
Natural Sciences Engineering and Technology Journal Vol. 3 No. 1 (2023): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v3i2.34

Abstract

The water heater is a common facility found in hotels or homes. There are alternative ways to do this besides using water heaters on the market, namely by utilizing the heat generated by the compressor and which will be discharged through the condenser, by adding a heat recovery system to the air conditioning unit. These research tests were carried out on variations of the serpentine-type heat exchanger with variations in the number of fin plates on the performance of the heat recovery system and on the split air conditioner. This research is an experimental study on a serpentine-type heat exchanger. Tests were carried out on a variety of heat exchangers with variations in the number of fin plates combined with a heat recovery system on a split AC. The independent variables in this study were three variations of the placement of the fin plate on the serpentine-type coil and the setting of the output air of the AC evaporator. Enthalpy values, refrigeration effects, compressor work, condenser, and coefficient of performance (COP) are calculated and presented in tables and graphs. The results of the performance of the heat recovery system obtained variations in the setting of the air burst coming out of the evaporator 24ºC has the highest COP value. The use of a heat recovery system can increase COP. With variations in the number of fin plates in a heat recovery system with a serpentine heat exchanger, the use of 5 fin plates has the hottest water temperature compared to the use of 3 fin plates and 1 fin plate.
Performance Evaluation of a Heat Recovery System Combined with a Helical-Type Heat Exchanger as a Water Heater I Putu Aris Eka Saputra; Made Sucipta; Hendra Wijaksana
Natural Sciences Engineering and Technology Journal Vol. 3 No. 1 (2023): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v3i2.35

Abstract

A heat recovery system is a form of reuse of wasted heat energy as a water heater. The water heater is an effort to utilize heat from the work of the compressor without reducing the function of the air conditioner as a room cooler. This study aimed to evaluate the coefficient of performance between standard air conditioners and modified air conditioners with heat recovery systems using a helical-type heat exchanger with a distance of 0 cm between coils. This was an experimental study on a helical-type heat exchanger. Tests were carried out on standard split air conditioners and modified split air conditioners with heat exchangers. The independent variables in this study are variations of the helical type heat exchanger with a distance of 0 cm between the coil and variations in the air setting at the evaporator output. 16ºC, 20ºC and 24ºC. The dependent variable in this study is the coefficient of performance. The evaporator outlet air temperature setting of 16°C has the greatest heat recovery system value, and this is because the evaporator outlet air temperature setting of 16°C has the largest h2 value compared to other evaporator outlet air temperature settings. The greater the evaporator output air temperature setting, the greater the value of the resulting heat recovery system. In conclusion, the highest coefficient of performance is found at the evaporation exit temperature of 24ºC, and the variation in the distance between the coil is 0 cm. Meanwhile, the hottest water temperature is found in the evaporator air setting of 16ºC with a variation of the distance between the coil of 0 cm.
Evaluation of Serpentine-Type Heat Exchanger Application on Water Heater with Passages Number Variation I Gede Arya Dimas Wisnu Murti Surawardana; Made Sucipta; Hendra Wijaksana
Natural Sciences Engineering and Technology Journal Vol. 3 No. 2 (2023): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v4i1.36

Abstract

For some people, using warm water for bathing needs is a tertiary need because getting warm water requires additional costs. Generally, people/industry use water heaters that are sold in the market. These water heaters generally use electricity, solar power, or natural gas. This study aimed to evaluate the use of heat recovery systems as water heaters with variations in the number of passages. This research is an experimental study on a serpentine-type heat exchanger. Tests were carried out on standard split air conditioners and split air conditioners integrated with heat exchangers. The independent variables in this study were variations of the heat exchanger type serpentine with a length of 4 m, with each heat exchanger having a height of 20, 25, and 30 cm, with variations of 10, 12, and 14 passages and variations of evaporator output air settings 16ºC, 20ºC and 24ºC. The use of the evaporator outlet air temperature setting produces a different refrigeration effect value. The lower the evaporator output air temperature setting, the lower the resulting refrigeration effect value. The air temperature leaving the evaporator is 24ºC which results in a higher refrigeration effect value. This study showed the best heater performance at the evaporator air setting of 16ºC with a variation of 10 passages. In conclusion, the addition of a heat recovery system with serpentine-type heat exchanger variations 10 passages, 12 passages, 14 passages, and 24°C temperature loading variations, 20°C and 16°C on the evaporator burst will have an impact on decreasing the coefficient of performance on the split air conditioner system.
Co-Authors A.Md, Sofwat Sanjaya Agung, A A Gde Ngurah Aqsal Raja Bramastha Astawa, I Ketut I Gede Arya Dimas Wisnu Murti Surawardana I Gede Biyan Mulyana I Gede Teddy Prananda Surya I Gusti Agung Gede Kusuma Artha I Gusti Agung Pramacakrayuda I Ketut Adi Sugita I Ketut Sudarsana I Made Feby Arya Putra I Nengah Suarnadwipa I Putu Aris Eka Saputra I Putu Gede Krisna Mahendra Putra I Wayan Bandem Adnyana Ida Bagus Adinugraha K. Astawa Ketut Astawa Komang Metty Trisna Negara Made Sucipta Made Sucipta Mahendra, Gede Putra Ni Made Suaniti Putu Lokantara Santika, A A Dwi Sitompul, Ignasius Deo Susila, I Putu Pradnya T. P Surya