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Improving the efficiency of refrigeration and air conditioning equipment can significantly contribute to a sustainable society based on energy saving. The key component in this type of equipment is the compressor, which consumes a large amount of energy. It is important to develop a compressor with high efficiency in order to reduce the energy consumption. Thanks to recent advancements in technology, computer-aided engineering (CAE) is now being used in the development process of compressors. CAE consists of two techniques, 1D CAE and 3D CAE, that are used for different purposes in accordance with the goal. 1D CAE is the one-dimensional simulation such as lumped constant model. 3D CAE is the three-dimensional simulation such as computational fluid dynamics (CFD) which utilize 3D simulation model. Damle et al. (2011) presented a 1D simulation model for a reciprocating compressor and compared the numerical and experimental results. Roskosch et al. (2017) introduced a differential compressor model and evaluated the prediction errors of this model, which was used to predict compressor performance for several refrigerant gases. Negrao et al. (2011) presented a semi-empirical mathematical model to simulate the unsteady behavior of a reciprocating compressor in refrigerators. In this model, a simplified compressor model based on thermodynamic equations was used. Dhar et al. (2016) presented a 3D CFD transient model of a reciprocating compressor that simulated the suction and discharge motion of valves. Posch et al. (2017) presented a 3D thermal model of a reciprocating compressor that considers oil distribution using CFD software. In this model, the oil jet flow in the compressor shell and the temperature fields of the compressor were predicted by using a VOF method. Posch et al. (2017) presented a 3D-elastohydrodynamic (EHD) simulation model of a reciprocating compressor that models journal bearings and piston dynamics for analyzing mechanical losses. These 3D simulations were helpful for detailed analysis, but they required a lot of time for the calculation. It is difficult to predict compressor efficiency using only 3D CAE because it will include complicated multiphysics phenomena. Any calculation of this type demands an enormous amount of time. Recently, there have been reports of using both 1D and 3D simulations in combination. Ramchandran et al. (2018) presented an integrated 1D/3D modeling approach for a swashplate compressor. This simulation model combines a 1D Efficiency improvement of compressor for refrigerator using 1D CAE and 3D CAE