Performansi Sistem Refrigerasi Cascade Menggunakan MC22 Dan R407F Sebagai Alternatif Refrigeran Ramah Lingkungan Dengan Variasi Laju Pengeluaran Kalor Kondensor High Stage

Perkasa, Agung Dwi (2015) Performansi Sistem Refrigerasi Cascade Menggunakan MC22 Dan R407F Sebagai Alternatif Refrigeran Ramah Lingkungan Dengan Variasi Laju Pengeluaran Kalor Kondensor High Stage. Undergraduate thesis, Institut Technology Sepuluh Nopember.

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Abstract

Perhatian global dewasa ini sebagai pengaruh pemakaian refrigeran, tidak hanya masalah kerusakan ozon (ODP) dan efek pemanasan permukaan bumi (GWP), tetapi juga mencakup pada masalah efisiensi energi. Bersamaan dengan faktor ODP dan GWP, diupayakan alternatif pengganti refrigeran halo-karbon yang dapat meningkatkan penghematan energi. Telah diketahui bahwa pemborosan energi dengan meningkatnya pembangunan pembangkit tenaga listrik untuk memenuhi kebutuhan tenaga listrik, peningkatan pemakaian bahan bakar minyak, secara signifikan memberikan kontribusi pada peningkatan pemanasan bumi melalui efek rumah kaca. Data penelitian kali ini didapatkan dengan melakukan pengujian pada peralatan sistem refrigerasi di laboratorium pendingin dan pengkondisian udara, dengan menguji performa sistem refrigerasi cascade menggunakan intermediate tipe PHE yang menggunakan refrigeran MC22 di high stage dan R407F di low stage. Kemudian menghidupkan kompresor HS dan LS sampai kondisi steady state, lalu mengatur variasi laju pengeluaran kalor pada kondensor dengan mengatur kecepatan aliran udara fan yang melalui kondensor yaitu mulai dari kecepatan 1, 2, 3, 4, 5. Hasil yang didapatkan dari performansi studi eksperimen ini adalah dengan bertambahnya laju pengeluaran kalor pada kondensor high-stage, temperatur dan tekanan kondensor high-stage semakin kecil. Hal ini mengakibatkan kapasitas refrigerasi, dan koefisien prestasi akan IV semakin naik. Pada variasi kecepatan fan tertinggi 2,8 m/s, coefficient of performance sistem sebesar 1.6998, kapasitas refrigerasi sebesar 1,3383 kW, heat rejection ratio sistem sebesar 1.5883, temperatur evaporator LS sebesar , dan temperatur kabin terendah sebesar , dan nilai effectiveness alat penukar kalor tipe plate heat exchanger sebesar 95.93%. ======================================================================================================= Refrigerant selection regarding to its global warming potential (GWP) and ozone depletion potential (ODP) value is not the only global attention we are facing in the past few decades. Another problem like energy conservation is one of the factor that deserves global attention. As a solution for this problem, refrigerants with low GWP and ODP which allow user to conserve more energy like hydrocarbons have started being used globally as substitutes. Energy conservation is crucial because the increasing energy waste will force human to build more power plants which will increase the demand of fuel. This increasing demand and use of fuel however, will result in the increasing of global temperature, known as global warming. This research is conducted by running several test on a Cascade refrigeration system in Cooling and Air Conditioning Laboratory in order to check its performance. The system uses intermediate type PHE with MC22, a hydrocarbon refrigerant at high stage and R407f at low stage. At the beginning of each test, both low and high stage compressors are turned on until the system runs at steady state. After the system is already running at steady state, heat rejection rate at high stage condenser is controlled by changing the condenser fan speed from speed one to five. VI The result from this research is the temperature and the pressure at high stage condenser are both decreasing as the heat rejection rate is increased. Together with the decreasing pressure and temperature of the condenser the refrigeration capacity and coefficient of performance are both increasing. With the highest fan speed variation, 2.8 m/s, the coefficient of performance of the system is 1.6998, the refrigeration capacity is 1.3383 kW, the heat rejection ratio is 1.5883, low stage evaporator temperatyre is - , refrigerator box temperature is , and the PHE effectiveness is 95.93 %.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 621.402 5 Per p
Uncontrolled Keywords: Sistem Cascade, Plate Heat Exchanger, Kapasitas Refrigerasi, effectiveness, COP
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 22 Nov 2019 03:51
Last Modified: 22 Nov 2019 03:51
URI: http://repository.its.ac.id/id/eprint/71967

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