Start-up Characteristics of Linear Compressors in a Refrigeration System
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https://doi.org/10.1007/s11630-020-1325-z
Article ID: 1003-2169(2020)00-0000-00
Start-up Characteristics of Linear Compressors in a Refrigeration System ZOU Huiming1,2, LI Xuan1,2, TANG Mingsheng1*, TIAN Changqing1,2 1. Key Laboratory of Cryogenics , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China 2. University of Chinese Academy of Sciences, Beijing 100049, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: This work investigates the start-up characteristics of linear compressors in a refrigeration system through experiment and simulation. Experiments are carried out by a refrigeration test system with a linear compressor controlled by a LabVIEW platform. A simulation model that considers the nonlinear process of gas force is set up on the basis of Runge-Kutta method for linear compressors. Compared with the experimental results, the simulation errors are within 15%, including the unstable state. The influences of ambient temperature and power frequency on linear compressors are studied through experiments. Unstable phenomena exist at 25°C ambient temperature compared with the designed ambient temperature of 35°C. The unsteadiness mechanism is analyzed by simulation. Simulation analysis indicated that two sensitive stages of linear compressors, namely, starting to pump and touching top dead center, are unstable. Furthermore, properly increasing equivalent mass (approximately 3%) or spring stiffness during the design stage can be a practical method to improve the stability of linear compressors.
Keywords: linear compressor, start-up, dynamic characteristics, unsteadiness
1. Introduction Compressors, as the key part of a refrigeration system, are a major research concern in the field of energy application. Reciprocating compressor has been applied widely in small-scale refrigeration system for the compression way of piston has high-volume efficiency [1, 2]. Due to this advantage, linear compressors are increasingly being applied in cryogenic and normal refrigeration because of their special free piston structure. Free piston devices, such as linear compressors and generators, have remarkable energy-saving and oil-free features [3–7]. The free piston construction for linear compressors has considerable advantages on capacity adjustment and energy recovery [8, 9]. These advantages make the application of linear compressors in a Received: Aug 04, 2019
AE: TALER Jan
refrigeration system a promising prospect [10, 11]. A linear compressor operating in a refrigeration system is often confronted with different working conditions. A typical characteristic of a linear compressor is its hypersensitivity to the working conditions owing to its free piston structure. The dynamic characteristics of linear compressors are constant research hotpots. Several scholars [12, 13] applied the displacement self-sensing technique to detect piston stroke. Sung et al. [14] estimated the stroke with ide
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