## 3 Results and Discussion  
Due to the significant impact of indicator efficiency on the electrical efficiency of the compressor, the variations in operating parameters and indicator efficiency can explain the experimental phenomena and results. In reference [30], a model for the electrical efficiency of a rolling piston compressor is proposed, with the following calculation formula for the indicator efficiency:  
\[\eta_{i}=\frac{\lambda_{T}\cdot\lambda_{D}}{1-\frac{15\cdot\Delta P_{dm}.Pr^{ -1/k_{suc}}}{h_{dis}-h_{suc}}} \tag{9}\]  
In Equation (9), \(\lambda_{T}\) represents the temperature coefficient, \(\lambda_{D}\) represents the leakage coefficient, \(\triangle P_{dm}\) represents the average pressure drop across the discharge valve, \(Pr\) represents the compression ratio of the compressor, k represents the adiabatic index of the working fluid, _such_ represents the specific volume of the suction gas, and \(h_{dis}\) and \(h_{suc}\) represent the specific enthalpy of the discharge and suction gases, respectively. From Equation (9), it can be seen that the indicator efficiency is inversely proportional to the compression ratio \(Pr\) and directly proportional to the specific volume of the suction gas, \(v_{suc}\). It can be seen from Figure 3 that under the various experimental conditions, the compressor electrical efficiency decreases with the change in the compressor suction state (from the superheated suction to the wet compression stage). In the superheated suction section of the compressor, the electrical efficiency shows a linear downward trend, but the decrease is small. In the wet compression section, the electrical efficiency also changes linearly and decreases with the decrease in suction dryness. However, the decline is higher than that of the superheated section; that is, when the compressor is wet compressed, the compressor's electrical efficiency decreases even more. In general, the electric efficiency of the compressor decreases from superheated suction to wet compression by 5-8%. Therefore, the suction state of the compressor has a significant effect on the electrical efficiency. When the compressor operates under the same suction state condition, a higher compression ratio results in lower electrical efficiency. On average, Experiments 1, 2, and 3 have an electrical efficiency that is 7.5% higher than Experiments 4, 5, and 6. Additionally, compared to Experiments 7, 8, and 9, the electrical efficiency is roughly 12.5% higher on average, indicating a significant effect. This is because higher compression ratios result in increased return flow and leakage, which in turn lead to higher pressure losses and more useless work. As a result, the compression ratio has a significant impact on electrical efficiency. It appears that a higher evaporating temperature results in a smaller suction volume of the compressor, which reduces its electrical efficiency under the same compression ratio conditions. Additionally, the electrical efficiency in Experiment 7 is about 5.8% higher than in Experiment 10 under the same compressor suction conditions with a higher compression ratio. Conversely, the electrical efficiency in Experiment 1 is approximately 2.8% higher than in Experiment 3 with a lower compression ratio. In summary, the electrical efficiency of the compressor is greatly impacted by the evaporation temperature, especially when the compressor has a higher compression ratio. Therefore, it is important to consider the influence of evaporation temperature on electrical efficiency. From the data presented in Figure 4, it is evident that the electrical efficiency of the compressor follows a similar trend at various frequencies. The rate of change in the superheated compressor suction and in the wet compression section remains constant. Interestingly, the data also reveal that as the compressor frequency increases, the electrical efficiency decreases for the same suction state.