Studi Eksperimental Pengaruh Variasi Laju Pelepasan Kalor Kondensor R32 Pada High Stage Dan R404a Low Stage Dengan Heat Exchanger Tipe Concentric Tube Terhadap Kinerja Sistem Refrigerasi Casecade. (Experimental Study of the Effect of Variations in the Heat Release Rate of The R32 Condenser at High Stage and R404a At Low Stage with a Concentric Tube Type Heat Exchanger on the Performance of the Casecade Refrigeration System).

Firmansyah, Reza Antoni and Prasetyo, Dwi Agus Yoga (2026) Studi Eksperimental Pengaruh Variasi Laju Pelepasan Kalor Kondensor R32 Pada High Stage Dan R404a Low Stage Dengan Heat Exchanger Tipe Concentric Tube Terhadap Kinerja Sistem Refrigerasi Casecade. (Experimental Study of the Effect of Variations in the Heat Release Rate of The R32 Condenser at High Stage and R404a At Low Stage with a Concentric Tube Type Heat Exchanger on the Performance of the Casecade Refrigeration System). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Abstract

Cascade refrigeration system is an effective solution for low temperature cooling applications that are difficult to achieve by single stage refrigeration systems. This study aims to analyze the effect of variations in the condenser heat release rate on the performance of a cascade refrigeration system using R32 refrigerant on the high stage side and R404A on the low stage side with a concentric tube type heat exchanger. The test was carried out experimentally under steady state conditions with variations in the high stage condenser fan speed of 1 m/s, 3 m/s, and 5 m/s using an 80 cm long capillary tube. The parameters analyzed include the condenser heat rate, the evaporator heat absorption rate, the Heat Rejection Ratio (HRR), and the Coefficient of Performance (COP). The results showed that increasing the condenser fan speed affected the performance of the cascade refrigeration system. The heat rate of the high stage condenser increased from 1.863 kW at a fan speed of 1 m/s to 1.995 kW at 3 m/s, then slightly decreased to 1.971 kW at 5 m/s. The heat rate absorbed by the low stage evaporator decreased from 0.948 kW to 0.918 kW as the fan speed increased. The HRR values were 1.96, 1.00, and 2.10, respectively, while the COP values were 0.970; 1.029; and 0.983 for fan speed variations of 1 m/s, 3 m/s, and 5 m/s. The optimum operating condition was obtained at a fan speed of 3 m/s with the highest COP value of 1.029, which indicates the best efficiency of the cascade refrigeration system.

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