Experimental investigation of the discharge valve dynamics in a reciprocating compressor for trans-critical CO2 refrigeration cycle

Ma, Youguang; He, Zhilong; Peng, Xueyuan; Xing, Ziwen

doi:10.1016/j.applthermaleng.2011.03.022

Cited by 134 publications

(55 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In order to reduce expansion losses, an experimental investigation of the valve dynamics has been carried out by Ma et al (2012). A semi-hermetic reciprocating compressor was developed with a test system incorporated into the compressor performance test rig, with a focus on investigating the dynamics of the discharge valves.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on charge optimization of a trans-critical CO2 cycle

Aprea

Greco

Maiorino

2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

The phasing out of hydrochlorofluorocarbon and chlorofluorocarbon fluids and further environmental problems arising from new, synthetic working fluids stimulate a continuously rising interest on natural candidates. The nontoxic and nonflammable CO 2 impacts neither on ozone depletion nor on global warming if leaked to the atmosphere. The critical temperature of CO 2 (31.1°C) is almost ambient and, therefore, it undergoes a transcritical refrigeration cycle. In cooling mode operation, a trans-critical CO 2 system, as compared to conventional airconditioners, has a lower performance which, contrary to conventional systems, strongly depends on the refrigerant charge. In this paper, the performance of the trans-critical system was evaluated experimentally under different refrigerant charge amounts. The influence of charge on coefficient of performance (COP), cooling capacity, compression ratio, suction line superheat was analyzed in detail. The experimental results indicate that the COP of the trans-critical cycle attains a maximum at optimal refrigerant charge. By varying the charge the cooling capacity attains a maximum, as well, that corresponds to the optimal charge. In order to understand the effect of refrigerant charge on the performance of each device of the plant, an exergetic analysis based on the experimental data was carried out. The analysis shows that the exergy flow destroyed in the compressor is one of the major causes of overall exergy destruction. At the optimal refrigerant charge, the compression losses attain a minimum.

show abstract

Section: Introductionmentioning

confidence: 99%

An experimental study on charge optimization of a trans-critical CO2 cycle

Aprea

Greco

Maiorino

2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Ludu [22] installed two endoscopes consisted of a thin fiber-optic bundle into the valve chamber so that valve movement could be obtained through clear pictures, and the valve lift was quantified by digital picture processing. Ma [23] had a close introduction about the experimental setup in which he used an eddy current displacement sensor to measure the discharge reed valve displacement and meanwhile, conducted a sensitivity analysis by varying the design parameters such as pressure ratio, valve lift, spring stiffness and rotational speed. He concluded that low pressure ratio, smaller valve lift and low rotational speed were optimal for the valve life and low rotational speed could also decrease the pressure loss across the valve.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on valve impact velocity and inclining motion of a reciprocating compressor

Xue

Feng

et al. 2013

Applied Thermal Engineering

Self Cite

View full text Add to dashboard Cite

“…As for experimental studies, Ma et al [12] measured the volumetric and thermodynamic efficiencies of a CO 2 compressor under various operating conditions and found that with the increase of the discharge pressure, the volumetric efficiency decreases while the total isentropic efficiency maintains a constant. Nagata et al [13] measured the motion of the suction valve of a hermetic reciprocating compressor for a domestic refrigerator with a strain gauge.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Thermodynamic Process of the Refrigerator Compressor Based on the m-θ Diagram

Wang

Guo³

et al. 2017

Energies

Self Cite

View full text Add to dashboard Cite

Abstract:The variation of refrigerant mass in the cylinder of refrigerator compressor has a great influence on the compressor's thermodynamic process. In this paper, the m-θ diagram, which represents the variation of refrigerant mass in compressor cylinder (m) and the crank angle (θ), is proposed to investigate the thermodynamic process of the refrigerator compressor. Comparing with the traditional pressure-Volume (p-V) indicator diagram, the refrigerant's backflow trigged by the delayed closure of valve can be clearly expressed in the m-θ diagram together with the mass flow rate. A typical m-θ diagram was obtained by experimental and theoretical investigations. To improve the thermodynamic model of the compressor, a 3D fluid-structure interaction (FSI) FEA model has been introduced to find out the effective flow area of the valves. Based on the m-θ diagram, the effect of rotating speed on the backflow through the valve, which depends on the movement of the valve, has been investigated. Specific to the compressor used in this study, the maximum backflow through the suction valve and discharge valve occur at 3500 r·min −1 and 5500 r·min −1 , respectively.

show abstract

Experimental investigation of the discharge valve dynamics in a reciprocating compressor for trans-critical CO2 refrigeration cycle

Cited by 134 publications

References 6 publications

An experimental study on charge optimization of a trans-critical CO2 cycle

An experimental study on charge optimization of a trans-critical CO2 cycle

Experimental investigation on valve impact velocity and inclining motion of a reciprocating compressor

Investigation of the Thermodynamic Process of the Refrigerator Compressor Based on the m-θ Diagram

Contact Info

Product

Resources

About