Abstract
Ice Slush Machine uses a direct cooling vapor compression system. The primary refrigerant used in such a system mostly is hydrofluorocarbons (HFCs), such as R134a. R134a is a retrofit for refrigerant R-12 which is included in the chlorofluorocarbon (CFC) type of refrigerant. CFC-type refrigerants have a dangerous impact on the environment. Hydrocarbon refrigerant MC-134 is an alternative for R-134a because it has a low potential value for environmental damage. The secondary refrigerant used was propylene glycol and the product used was 3.5 liters of Coca-Cola. From the test results when the system using R134a had an average COP actua l and an average COP carnot of 2.6 and 4.55, respectively, and the energy consumption was 1.571 kWh with an average efficiency of 57%, while in a system with MC-hydrocarbon refrigerant 134 obtained an average COP actual and an average COP carnot of 2.8 and 4.5, respectively and the energy consumption of 1.325 kWh with an average efficiency of 62%. Therefore, MC-134a had COP actual greater than R-134 and electrical energy consumption of MC-134 was less than R-134a.
Highlights
Science and technology growth is rapidly developing, including in the field of refrigeration
R134a is a refrigerant that is often used in refrigeration systems because of its good performance as a medium for conducting heat
R134a itself is an alternative refrigerant to replace R12, which is included in the chlorofluorocarbons (CFC) refrigerant [3,4,5]
Summary
Science and technology growth is rapidly developing, including in the field of refrigeration. The tools used were ice slush machines with a vapor compression system and the cooling method was brine cooling [8]. The process started with leak tests, vacuum, and charging. These steps can be simplified into one step called tools set-up. 2.3 Procedure The basic principle of work on this ice slush machine is the same as the vapor compression refrigeration system in general, the only difference lies in the use of secondary refrigerants as a medium for auxiliary absorption of heat [11]. During the absorption of heat in the evaporator, the primary refrigerant phase changed into a mixture of vapor and flowed back into the compressor so that the refrigeration cycle occurred [12]
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