Abstract
The purpose of this research is to design a freezer system that is used to study the comparison of the performance of a 1/5 PK freezer with the working fluid R-134a and Musicool MC-134. In this research, the main components used are 1/5 PK hermetic compressor, plate surface evaporator, water cooled condenser, and capillary pipes. The research was carried out by replacing R-134a refrigerant with Musicool MC-134 without changing the supporting components of the system (retrofit). The results showed that the retrofit from R-134a to Musicool MC-134 was very capable and feasible to be implemented. The system will be safe if the components of the system used are in accordance with the prerequisites (from the old working fluid, R-134a), the opposite will cause insecurity due to susceptibility to leakage (since the substitution of working fluid, MC-134, is more flammable). In addition, the use of MC-134 will result in a temperature drop that is much than R-134a, in other words cooler faster which is 30% (for a set point temperature of -18 o C). Keywords: Retrofit, Musicool, R-134a, MC-134, Freezer
Highlights
Di dunia Refrigerasi dan Pengkondisian Udara (Refrigeration and Air Conditioning), penggunaan fluida kerja berbahan sintetis akan berdampak negatif yang cukup besar bagi lingkungan
The purpose of this research is to design a freezer system that is used to study the comparison of the performance of a 1/5 PK freezer with the working fluid R-134a and Musicool MC-134
The results showed that the retrofit from R-134a to Musicool MC-134 was very capable and feasible to be implemented
Summary
Di dunia Refrigerasi dan Pengkondisian Udara (Refrigeration and Air Conditioning), penggunaan fluida kerja berbahan sintetis akan berdampak negatif yang cukup besar bagi lingkungan. Jenis refrigeran ini masih memiliki efek negatif yang lainnya (yaitu efek rumah kaca) yang berperan secara signifikan terhadap pemanasan global (karena angka GWP-nya (Global Warming Potential) cukup besar). Kelebihan MC-134 adalah fluida kerja berkemurnian tinggi, tidak reaktif terhadap lapisan ozon, relatif tidak menyebabkan pemanasan global, dan membutuhkan pasokan energi listrik 20% lebih sedikit untuk sistemnya (Musicool MC-134, 2018). Pada penelitian ini MC22 memiliki kerja kompresor yang terkecil dibanding 2 refrigeran lainya yaitu sebesar 1,386 kW. Di awalnya terjadi proses kompresi (titik 1, sebelum kompresor), dimana fluida kerja / refri-geran yang berfasa uap jenuh dan bertekanan rendah dinaikkan tekannnya (dan secara simultan temperaturnya dinaikkan juga) hingga mencapai titik 2 yang fasanya (sepenuhnya) uap. Cairan refrigeran kembali diuapkan (melalui evaporator) pada tekanan konstan, sehingga kalor (dari ruangan yang dikondisikan) bisa diserap untuk menguapkan cairan refrigeran yang masih ada (hingga menjadi uap jenuh)
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