Analisa Perpindahan Panas Pada Modifikasi Evaporator Unit Pendingin Difusi Absorpsi

Supriadi, Ahmad (2012) Analisa Perpindahan Panas Pada Modifikasi Evaporator Unit Pendingin Difusi Absorpsi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Evaporator merupakan salah satu komponen dalam unit pendingin yang memiliki peranan penting dalam menentukan nilai COP (Coeficient of Performance) unit pendingin. Nilai COP sistem absorpsi uap biasanya berada dibawah 1, sedangkan untuk sistem difusi absorpsi memiliki nilai COP lebih kecil lagi, yaitu berkisar antara 0,01 hingga 0, 7. Kapasitas evaporator dipengaruhi tipe perpindahan panas konveksi natural yang terjadi di dalam kabin unit pendingin, hal ini yang mendorong penulis melakukan penelitian untuk mengetahui karakteristik perpindahan panas pada evaporator unit pendingin difusi absorpsi. Evaporator didesain sesuai dengan evaporator tipe DAR 2 untuk mendapatkan nilai COP yang lebih tinggi. Kemudian penulis melakukan analisa dengan menghitung besarnya kapasitas pendinginan dari evaporator melalui dua metode yaitu dengan perpindahan panas natural konveksi dari udara di dalam kabin menuju plat datar evaporator dan dengan metode LMTD. Penulis juga menganalisa pengaruh daya generator laju aliran massa yang melalui evaporator, kapasitas pendinginan evaporator, laju alir massa serta koefisien konveksi refrigeran. Selanjutnya dihitung pada variasi daya inputan generator yang berbeda yaitu dengan inputan generator 45 Watt, 69 Watt, 87 Watt dengan inputan daya heater tetap konstan 5 Watt. Hasil yang didapat dari penelitian ini adalah dengan daya generator 45 Watt didapatkan nilai koefisien konveksi antara kabin dan plat datar sebesar 12,4 W/m, laju aliran massa referigeran sebesar 0,23 g/h dan nilai kapasitas pendingina pada evaporatornya sebesar 5,80 Watt. Untuk daya generator sebesar 69 Watt didapatkan nilai koefisien konveksi antara kabin dan plat datar sebesar 15,59 Wlm2, nilai laju aliran massa referigeran sebesar sebesar 0,32 g/h dan kapasitas pendinginan sebesar 7,12 Watt. Pada daya generator 87 Watt didapatkan nilai koefisien konveksi antara kabin dan plat datar sebesar 25,15 W/m2, laju aliran massa referigeran sebesar 0,46 g/h dan nilai kapasitas pendinginannya sebesar 11,80 Watt
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The evaporator is one of the components in the cooling unit that has an important role in determining the COP (Coefficient of Performance) value of the cooling unit. The COP value of the vapor absorption system is usually below 1, while for the absorption diffusion system it has a smaller COP value, which ranges from 0.01 to 0.7. The capacity of the evaporator is influenced by the type of natural convection heat transfer that occurs in the cooling unit cabin, this is what prompted the author to conduct research to determine the characteristics of heat transfer in the evaporator of the absorption diffusion cooling unit. The evaporator is designed according to the DAR 2 type evaporator to obtain a higher COP value. Then the author conducted an analysis by calculating the cooling capacity of the evaporator through two methods, namely by natural convection heat transfer from the air in the cabin to the flat plate evaporator and by the LMTD method. The author also analyzed the effect of generator power on the mass flow rate through the evaporator, the evaporator cooling capacity, the mass flow rate and the refrigerant convection coefficient. Furthermore, it was calculated on different generator input power variations, namely with generator input of 45 Watt, 69 Watt, 87 Watt with constant heater power input of 5 Watt. The results obtained from this study are with a generator power of 45 Watt, the convection coefficient value between the cabin and the flat plate is 12.4 W/m, the mass flow rate of the refrigerant is 0.23 g/h and the cooling capacity value of the evaporator is 5.80 Watt. For a generator power of 69 Watt, the convection coefficient value between the cabin and the flat plate is 15.59 Wlm2, the mass flow rate of the refrigerant is 0.32 g/h and the cooling capacity is 7.12 Watt. At a generator power of 87 Watt, the convection coefficient value between the cabin and the flat plate is 25.15 W/m2, the mass flow rate of the refrigerant is 0.46 g/h and the cooling capacity value is 11.80 Watt.

Item Type:	Thesis (Other)
Additional Information:	RSM 660.284 26 Sup a-1 2012 (weeding)
Uncontrolled Keywords:	evaporator, konveksi natural, difusi absorpsi , Coef~eient of Performance; evaporator, nahual convection, diffusion absorption, CoefJCient of Performance
Subjects:	Q Science > QC Physics > QC320 Heat transfer
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	EKO BUDI RAHARJO
Date Deposited:	24 Sep 2025 02:45
Last Modified:	24 Sep 2025 02:45
URI:	http://repository.its.ac.id/id/eprint/128400

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