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... the calculation of the pressure the temperature of the walls and the secondary fluid are also calculated using the Newton-Rapshon. Figure 1 represents the flowchart for the calculation model described. ...
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... Fig. 10 shows the variation of superheat after the step perturbation. During the first 50 seconds the evaporator is operating at steady state and the level of superheat is constant for the R1234yf and R134a of 8.1 and 11.1 ° C, respectively. When t=50 s the mas flow rate at the evaporator inlet was reduced sharply and the amount of mass inside ...
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... is operating at steady state and the level of superheat is constant for the R1234yf and R134a of 8.1 and 11.1 ° C, respectively. When t=50 s the mas flow rate at the evaporator inlet was reduced sharply and the amount of mass inside the evaporator decreases causing an increased in the superheat at the outlet of the evaporator. As seen in Fig. 10, R1234yf always has a degree of superheat lower than R134a. This occurs due to the difference between the evaporation latent heats of the two fluids. The time for the superheat stabilize for R1234y is also higher than for R134a. This occurs for the same reasons seen in Fig. 7 to ...
