AULIA, IRHAM (2025) ANALISIS KINERJA DAN EFISIENSI CAPILLARY LINE-SUCTION LINE HEAT EXCHANGER (CL-SLHX) PADA UNIT TATA UDARA DOMESTIK YANG TELAH DIRETROFIT DENGAN REFRIGERAN R290. S2 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Global warming drives the increasing demand for air conditioning (AC) systems, which in turn impacts energy consumption and greenhouse gas emissions. This study aims to improve the efficiency of residential AC systems through a combination of retrofitting from HCFC-22 to HC-290 and modification with a Capillary Line-Suction Line Heat Exchanger (CL-SLHX). Data collection was carried out by cooling a room from 27 °C to 21 °C. Tests were conducted on two AC units with capacities of 2.0 kW and 3.5 kW. The results show that retrofitting with HC-290 increased COP by up to 6%, and its combination with CL-SLHX further improved COP by 18% and 24% compared to the baseline. The addition of CL-SLHX also reduced cooling time by 18 and 26 minutes, respectively, and enhanced subcooling, which contributed to higher Refrigeration Effect values. Energy efficiency was improved, resulting in electricity savings of 17.27 kWh and 39.46 kWh per month, equivalent to Rp. 24,954.51 and Rp. 57,013.97. CO2 emissions were also reduced, with potential direct emission reductions of 967 kg.CO2 and 1,671.14 kg.CO2, as well as indirect emission reductions from energy consumption of up to 153.05 kg.CO2 per year and 408.13 kg.CO2 per year. These findings indicate that the application of HC-290 and CL-SLHX in conventional AC units can serve as an effective and sustainable alternative without the need for replacing existing air conditioning systems. Keywords: Capillary Line-Suction Line Heat Exchanger, CL-SLHX, HC-290 retrofit, thermodynamic efficiency Pemanasan global mendorong peningkatan kebutuhan perangkat tata udara (AC) yang berdampak pada konsumsi energi dan emisi gas rumah kaca. Penelitian ini bertujuan untuk meningkatkan efisiensi sistem AC residensial melalui kombinasi retrofit dari HCFC-22 ke HC-290 serta modifikasi Capillary Line-Suction Line Heat Exchanger (CL-SLHX). Metode pengambilan data diambil dari pendinginan ruangan mulai dari 27 oC ke 21 oC. Pengujian dilakukan pada dua unit AC berkapasitas 2,0 kW dan 3,5 kW. Hasil menunjukkan bahwa retrofit HC-290 meningkatkan COP hingga 6% dan kombinasinya dengan CL-SLHX meningkatkan COP lebih lanjut hingga 18% dan 24% dibanding baseline. Penambahan CL-SLHX juga menurunkan waktu pendinginan hingga 18 dan 26 menit lebih cepat serta meningkatkan nilai subcooling yang berdampak pada meningkatnya nilai Efek Refrigerasi. Efisiensi energi meningkat dengan penghematan listrik 17,27 kWh dan 39,46 kWh per bulan, setara dengan Rp. 24.954,51 dan Rp. 57.013,97. Emisi CO2 juga menurun dengan potensi reduksi emisi langsung sebesar 967 kg.CO2 dan 1.671,14 kg.CO2, serta emisi tidak langsung dari konsumsi energi hingga 153,05 kg.CO2 per tahun dan 408,13 kg.CO2 per tahun. Hasil ini menunjukkan bahwasanya penerapan HC-290 dan CL-SLHX pada unit AC konvensional dapat menjadi alternatif berkelanjutan yang efektif tanpa perlu penggantian unit tata udara. Kata kunci: Capillary Line-Suction Line Heat Exchanger, CL-SLHX, Retrofit HC-290, efisiensi termodinamika
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