A study on cycle performance variation of a linear compressor considering valve behavior

Park, Sang Jun; Hwang, Il Sun; Oh, Won Sik; Lee, Young Lim

doi:10.1007/s12206-017-0848-z

Cited by 13 publications

(5 citation statements)

References 5 publications

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“…This is mainly due to the inertia of the valve. The inertia force is proportional to the square of the frequency [15]. Meanwhile, the slight delay of the valve closing was present when the piston was at the Top Dead Center, which also induced the backflow of the gas.…”

Section: The Discharge Valve Movements With the P-t Diagram Inside Th...mentioning

confidence: 99%

“…Some researchers have investigated the valve dynamics of the linear compressor. Park et al [15] comparatively analyzed the difference between the rigid body model and the Fluid-Structure Interaction (FSI) model of the suction valve to predict the Energy Efficiency Ratio (EER) of the compressor. The results indicated that the simple rigid body model can be used to estimate the EER of the compressor due to the low difference.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in the work by Liu et al [21], the viscosity of the nitrogen was about 18.1 µPa•s (the viscosity of the helium is about 20.0 µPa•s), while the viscosity of the refrigerant was about 11.1 µPa•s (taking R134a as an example). According to the rigid body model of the reed valve [15], the reed motion can be expressed by the one-dimensional vibration equation.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System

Sun²,

Zou

et al. 2023

Sustainability

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In a linear compressor, the valve motion significantly affects the thermodynamic efficiency and the compressor’s reliability, especially in oil-free conditions. To better understand the dynamic behavior of the discharge valve, a real-time test bench was built. The piston movements and dynamic pressure in the cylinder were also observed to obtain the synchronizing characteristics among the reed valve motion, cylinder pressure, and piston motion. Observing the motion of the discharge valve visually, the discharge valve flutters due to the change in the form of the cylinder pressure, the delayed opening of the valve is caused by the inertia of the valve itself, and additional displacement fluctuations are present. This paper presents the dynamic behavior of the discharge valve under different discharge pressure/operating frequency/piston stroke/clearance length conditions. The results show that the valve flutters increase, the mean displacement of the valve increases, and the duration of the discharge increases when the discharge pressure decreases. When the operating frequency increases, the duration of the discharge decreases, while the mean displacement of the valve increases. For a high stroke or a low clearance length case, the duration of the discharge increases, while the valve flutters increase due to the pressure fluctuations in the cylinder. Through analyzing the synchronizing characteristic among the valve movements, piston movements, and cylinder pressure, it is shown that the phenomenon of the delayed opening valve is much worse for a low stroke or a high operating frequency case. In addition, the delayed closing of the valve appears for a high operating frequency case (75 Hz).

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Section: The Discharge Valve Movements With the P-t Diagram Inside Th...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System

Sun²,

Zou

et al. 2023

Sustainability

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“…Check valve is one of the core components of scroll refrigeration compressor, which plays a decisive role on its efficiency, noise characteristic and reliability. [7][8][9] Under the refrigeration condition, the pressure ratio of scroll compressor is much larger than the volume ratio under low-temperature working condition. So a check valve device must be provided to reduce the impact of under compression on the performance of the compressor.…”

Section: Introductionmentioning

confidence: 99%

Research on the influence of check valve on noise performance of variable frequency scroll refrigeration compressor

Yan

Wang

et al. 2023

International Journal of Aeroacoustics

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Check valve is one of the core components of the scroll refrigeration compressor, which can directly affect its efficiency, life, and noise performance. Traditional check valve is the reed valve. This paper deeply studies the dynamic characteristics of reed valve and reveals the main reason of the valve noise under different rotation speeds. The large noise is mainly attributing to the large pressure pulsation as well as fast circulation velocity of fluid and the severe slapping of the reed plate on the valve seat, which is influenced by the high pressure ratio of the working condition and stiffness of the reed valve. In order to reduce the noise of the check valve, the circular valve is designed to replace reed valve in this paper. At each rotation speed, the circular valve shows a continuous exhaust process, which avoids the slapping of the valve plate on the valve seat. More importantly, the exhaust is smooth and the pressure pulsation as well as the flow rate of the fluid is reduced significantly leading to the low aerodynamic noise. Therefore, compared with the reed valve compressor, the sound pressure level of the circular valve compressor at 1800, 4200, and 6600 rpm is decreased by 3.0, 5.2, and 0.3 dB, respectively.

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“…Hwang et al [21,22] established an FSI model to study the performance of the discharge valve. Moreover, the results showed that the valve lift obtained from the 3D fluid-structure interaction model was basically consistent with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Dynamic Characteristics of the Reed Valve in Compressors Based on Fluid-Structure Interaction Method

Wang

Jin

et al. 2021

Applied Sciences

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The flow in the gap between the reed and the valve seat has a significant influence on the dynamic characteristics of the reed valve used in reciprocating compressors. The fluid–structure interaction (FSI) method is an effective method for studying reciprocating compressors. A three-dimensional FSI model of a reciprocating compressor with a reed valve is established in this paper, which has an important influence on the flow rate characteristic of reciprocating compressors. Furthermore, an experimental investigation is implemented to verify the FSI model. Based on the established FSI model, the pressure distribution on the reed valve surface is identified by varying the height of the suction valve limiter and the rotational speed of the compressor, which has an important effect on the dynamic characteristics of the reed valve. Although the low-pressure region, due to the Bernoulli effect on the surface of the reed, hinders the rapid opening of the valve to some extent, it is obviously beneficial to the timely closure of the valve and increases the volumetric efficiency of the compressor. Moreover, the optimal height of the valve limiter and the appropriate rotational speed of the compressor are obtained.

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A study on cycle performance variation of a linear compressor considering valve behavior

Cited by 13 publications

References 5 publications

Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System

Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System

Research on the influence of check valve on noise performance of variable frequency scroll refrigeration compressor

Investigation on Dynamic Characteristics of the Reed Valve in Compressors Based on Fluid-Structure Interaction Method

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