Studi Experimental Pengaruh Variasi Panjang Katup Expansi Refigerasi Low Stage R404a Dan Refigerasi R32 High Stage Dengan Heat Exchanger Tipe Concentrik Tube Terhadap Kinerja Sistem Refigerasi Casecade. (Experimental Study on the Effect of Expansion Valve Length Variations in an R404A Low-Stage and R32 High-Stage Cascade Refrigeration System with a Concentric Tube Heat Exchanger on System Performance).

Betran, Muhammad and Maulana, Mochammad Ghifari (2026) Studi Experimental Pengaruh Variasi Panjang Katup Expansi Refigerasi Low Stage R404a Dan Refigerasi R32 High Stage Dengan Heat Exchanger Tipe Concentrik Tube Terhadap Kinerja Sistem Refigerasi Casecade. (Experimental Study on the Effect of Expansion Valve Length Variations in an R404A Low-Stage and R32 High-Stage Cascade Refrigeration System with a Concentric Tube Heat Exchanger on System Performance). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Abstract

A Cascade refrigeration system is one of the effective multi-stage cooling methods to achieve very low operating temperatures that cannot be achieved by a single refrigeration cycle efficiently. In this study, an experimental study was conducted to determine the effect of variations in the length of the capillary tube on the operating characteristics and performance of the cascade refrigeration system using R32 refrigerant at the high stage and R404A at the low stage with a concentric tube type heat exchanger as an intermediary medium for heat exchange between the two cycle levels. Variations in the capillary tube are regulated by adjusting the fan speed on the high stage condenser to obtain a comparison of the effect of the refrigerant produced by the evaporator with the compressor work. One method of increasing work by modifying the expansion device changes in heat transfer, pressure, and temperature in each cycle. Testing was carried out under steady state conditions without cooling load and without any assumption of heat loss. The parameters observed include temperature, working pressure, evaporator cooling capacity, heat exchanger effectiveness, heat rejection ratio (HRR), and the value of the coefficient of performance (Coefficient of Performance/COP). The experimental results show that variations in the capillary tube in the high stage condenser result in a decrease in condensation pressure and temperature, increasing compressor work and pressure ratio if the capillary tube is too long it can reduce the cooling capacity in the low stage. This condition has an impact on the total COP of the system until it reaches optimum operating conditions on the capillary tube variation. Overall, the configuration of R32–R404A refrigerants in the cascade refrigeration system is able to provide good and stable cooling performance at low temperatures. This system is suitable for low-temperature industrial applications such as cold storage and fast freezing, provided that the condenser heat release rate is controlled properly to obtain maximum energy efficiency.

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