ANALISIS PERPINDAHAN PANAS PIPA HEAT EXCHANGER DENGAN MATERIAL SS 316 UNTUK TEMPERATUR SEDUH KOPI PADA MESIN KOPI ESPRESSO TIPE-X

YOGANTARA, BIMA (2021) ANALISIS PERPINDAHAN PANAS PIPA HEAT EXCHANGER DENGAN MATERIAL SS 316 UNTUK TEMPERATUR SEDUH KOPI PADA MESIN KOPI ESPRESSO TIPE-X. S1 thesis, Universitas Mercu Buana Jakarta.

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Abstract

The heating tank / heat exchanger is one of the most important components of an espresso coffee machine, because of its role that affects the temperature of the coffee brewing water and the results of the espresso coffee served. In this study, to determine the performance of the heat exchanger, related to the temperature of the water that comes out to the group head during the brewing process. During the brewing process, to get quality espresso coffee, the temperature of the water coming out to the head group must be 90 ° C ± 2 ° C, the coffee temperature in the cup is 67 ° C ± 3 ° C, while the water pressure during brewing is 9bar ± 1bar (Caprioli , et al., 2012). This study uses experimental methods and mathematical analysis methods using general heat transfer equations. The heat exchanger used for this research is the X-type espresso coffee machine heat exchanger. The heat exchanger material tested was stainless steel 316 with a diameter of 38.1 mm and a length of 180 mm, which was embedded in the heating tank with a diameter of 177.8 mm and a length of 200 mm. With the analysis carried out, it can be seen that the heat exchanger's ability to produce hot water which is used for the coffee brewing process. The length of time required for the heater to heat water in the heat exchanger is at least 20 minutes until the pressure in the heating tank reaches 1.2 bar, and it takes 22 minutes for the pressure in the tank to become 1.5 bar. In this X-type espresso machine the average temperature that comes out to the group head during the brewing process only reaches 58.3 ° C at a pressure of 1.2 bar and 63.93 ° C at a pressure of 1.5 bar, while the brewing pressure is regulated. fixed, which is 9 bar. While the standard temperature for brewing / brewing coffee is at least 86 ° C, because in his book Folmer, 2017 states that the brewing temperature of espresso coffee is 88 ± 2 ° C. Based on the experiment, it can be stated that the X-type espresso machine's heating tank / heat exchanger has not been able to perform several standard temperature and pressure variables for brewing quality espresso coffee. Keywords : Stainless steel, Heat exchanger,grup head, brewing temperature. Tanki pemanas/heat exchanger adalah salah satu komponen mesin kopi espresso yang sangat penting, karena perannya yang berpengaruh terhadap temperatur air seduh kopi dan hasil kopi espresso yang disajikan. Pada penelitian ini untuk mengetahui kinerja heat exchanger, terkait temperatur air yang keluar ke group head saat dilakukan proses penyeduhan (brewing). Saat proses penyeduhan, untuk mendapatkan hasil kopi espresso yang berkualitas, temperatur air yang keluar ke grup head harus 90° C ± 2° C, suhu kopi dalam cangkir 67° C ± 3° C, sedangkan tekanan air saat penyeduhan 9bar ± 1bar (Caprioli, et al., 2012). Penelitian ini menggunakan metode eksperimental dan metode analisa secara matematis menggunakan persamaan umum perpindahan panas. Heat exchanger yang digunakan untuk penelitian adalah heat exchanger mesin kopi espresso tipe-X. Material heat exchanger yang diuji adalah stainless steel 316 dengan diameter 38,1 mm dan panjang 180 mm, yang tertanam di tanki pemanas dengan diameter 177,8 mm dan panjang 200 mm. Dengan analisis yang dilakukan dapat diketahui kemampuan heat exchanger memproduksi air panas yang digunakan untuk proses brewing/penyeduhan kopi. Lama waktu yang dibutuhkan heater untuk memanaskan air di dalam heat exchanger minimal 20 menit hingga tekanan pada tanki pemanas mencapai 1,2 bar, dan butuh waktu 22 menit sampai tekanan didalam tanki menjadi 1,5 bar. Pada mesin espresso tipe-X ini temperatur rata-rat yang keluar ke group head pada saat proses brewing hanya mencapai 58,3°C pada tekana 1,2 bar dan 63,93°C pada teknan 1,5 bar, sementara tekanan brewing diatur tetap, yaitu 9 bar. Sedangkan standar temperatur brewing/penyeduhan kopi minimal adalah 86°C, karena didalam bukunya Folmer, 2017 menyatakan suhu seduh kopi espresso adalah 88 ± 2°C. Berdasarkan eksperimen tersebut dapat dinyatakan bahwa tanki pemanas/heat exchanger mesin espresso tipe-X ini belum mampu untuk melakukan beberapa fariabel temperatur dan tekanan standar penyeduhan kopi espresso yang berkualitas. Kata kunci : Stainless steel, Heat exchanger,grup head, temperatur brewing.

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