Studi Eksperimen Pengaruh Nanofluida terhadap Unjuk Kerja Mesin Pengkondisian Udara

Suryani, Karina Rahma (2017) Studi Eksperimen Pengaruh Nanofluida terhadap Unjuk Kerja Mesin Pengkondisian Udara. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada tahun 2015, kebutuhan tenaga listrik nasional mencapai 232.52 TWh, dengan kontribusi sektor rumah tangga mencapai 44%. Hal ini disebabkan oleh peningkatan pemanfaatan energi listrik seiring dengan pertumbuhan penduduk dan perkembangan teknologi peralatan rumah tangga, salah satunya mesin pengkondisian udara (air conditioning unit, AC). AC digunakan untuk mengatur kondisi udara di dalam ruangan agar penghuni di dalamnya merasa nyaman. AC yang paling umum digunakan oleh masyarakat adalah AC split yang terdiri dari empat komponen dasar sistem refrigerasi siklus kompresi uap, yaitu kompresor, kondensor, alat ekspansi, dan evaporator. Unjuk kerja AC dinyatakan oleh nilai COP, atau perbandingan efek refrigerasi yang dihasilkan evaporator dengan kerja kompresor. Salah satu metode peningkatan unjuk kerja AC tanpa memodifikasi alat adalah aplikasi nanofluida ke dalam pelumasan AC. Alat dan bahan yang digunakan dalam penelitian ini antara lain AC split, refrigeran jenis hidrokarbon, pelumas sintetis jenis polyolester (POE) oil, dan nanofluida. AC split yang tersusun dari sebuah indoor unit dan outdoor unit dirangkai dengan TXV (thermostatic expansion valve), inverter, serta alat ukur berupa flowmeter, termokopel, dan pressure gauge. Pengambilan data dilakukan dengan menggunakan variasi beban evaporator (low, medium, high), volume nanofluida (0 ml, 10 ml, 25 ml, 40 ml), dan putaran kompresor (40 Hz dan 50 Hz). Pada setiap variasi, pengambilan data dilakukan selama 1 jam dengan interval 5 menit. Hasil penelitian menunjukkan bahwa aplikasi nanofluida memberikan pengaruh signifikan terhadap unjuk kerja AC. Penambahan nanofluida 40 ml menimbulkan peningkatan COP sebesar 7.5% dan kapasitas evaporator sebesar 4.93% pada beban high, serta penurunan HRR sebesar 1.29% pada beban medium. Aplikasi nanofluida juga memberikan pengaruh signifikan terhadap kompresor AC. Penambahan nanofluida 40 ml menimbulkan penurunan kerja kompresor sebesar 3.16% dan daya listrik sebesar 5.36% pada beban high, serta peningkatan efisiensi isentropis kompresor sebesar 11.36% pada beban yang sama. Di samping itu, penurunan frekuensi listrik memengaruhi penurunan nilai COP. ================================================================================== In 2015, the amount of national electricity demand reached 232.52 TWh, 44% of which was contributed by the household sector. This phenomena may have been caused by the increasing use of electrical energy as a result of population growth and development of home appliances technology, such as air conditioning unit (AC). AC is used to achieve a more comfortable interior environment. The most commonly used AC in the households is the split type, comprising of four basic components of a vapor-compression refrigeration cycle: compressor, condenser, expansion valve, and evaporator. Performance of AC is assessed based on the value of COP, or the ratio between refrigeration effect and compressor work. One of the many methods to enhance AC performance without any device modifications is by applying nanofluid into the compressor lubrication. Experimental setup includes AC split, hydrocarbon refrigerant, polyolester (POE) oil, and nanofluid. The AC, consisting of an indoor unit and an outdoor unit, is arranged with a TXV (thermostatic expansion valve), inverter, and measuring devices such as flowmeter, thermocouples, and pressure gauges. The process of data collection is conducted with various evaporator load (low, medium, high), nanofluid concentration (0 ml, 10 ml, 25 ml, 40 ml), and compressor rotation (40 Hz dan 50 Hz). Each variation takes up to one hour with a 5-minute interval. The results of this study show that the application of nanofluid has a significant effect on AC performance. The use of 40 ml nanofluid in high load generates a 7.5% increase in COP and a 4.93% increase in evaporating capacity, although in medium load creates a 1.29% decrease in HRR. Nanofluid also affects the compressor performance. The use of 40 ml nanofluid in high load reduces 3.16% compressor work and 5.36% electrical work, and also enhances 11.36% compressor isentropic efficiency. On the other hand, the change in electrical frequency impacts COP reduction.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 621.5 Sur s
Uncontrolled Keywords: Kompresor, COP, Nanofluida, Beban Evaporator, Refrigeran
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology > TP248 Nanogels. Nanoparticles.
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Karina Rahma Suryani
Date Deposited: 06 Oct 2017 03:46
Last Modified: 08 Mar 2019 02:49
URI: https://repository.its.ac.id/id/eprint/45783

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