Cooler 2 currently operates using R-134a as a refrigerant. The 2nd stage of your project is to study the possibility of exchanging this working fluid for ammonia (R-717), which is less harmful to the environment. To make this choice, you must evaluate the performance of Cooler 2 by calculating the coefficient of cycle performance (COP) for each fluid. Chiller 2 also operates at a flow rate of 1.4 kg/s, whose evaporation and condensing temperatures are -10 °C and 30 °C. The evaporation (1 → 2) and condensation (3 → 4) steps operate at constant pressures, so the pressure of each of these two steps is the saturation pressure relative to the operating temperature. For this 2nd step, you must deliver the project report with the following information: 2.a. Cycle COP using R-134a as refrigerant; 2.b. Cycle COP using R-717 as refrigerant; 2.c. Your opinion as an engineer on which of the two working fluids has a better performance, exclusively analyzing the cycle performance coefficients obtained.
Cooler 2 currently operates using R-134a as a refrigerant. The 2nd stage of your project is to study the possibility of exchanging this working fluid for ammonia (R-717), which is less harmful to the environment. To make this choice, you must evaluate the performance of Cooler 2 by calculating the coefficient of cycle performance (COP) for each fluid. Chiller 2 also operates at a flow rate of 1.4 kg/s, whose evaporation and condensing temperatures are -10 °C and 30 °C. The evaporation (1 → 2) and condensation (3 → 4) steps operate at constant pressures, so the pressure of each of these two steps is the saturation pressure relative to the operating temperature. For this 2nd step, you must deliver the project report with the following information:
2.a. Cycle COP using R-134a as refrigerant;
2.b. Cycle COP using R-717 as refrigerant;
2.c. Your opinion as an engineer on which of the two working fluids has a better performance, exclusively analyzing the cycle performance coefficients obtained.
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