Effect of Liquid on a Reciprocating Compressor

Prasad, B. G. Shiva

doi:10.1115/1.1491981

Cited by 15 publications

(6 citation statements)

References 1 publication

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“…The p À V diagram was constructed by monitoring the strain e of the piston rod. This was achieved by utilizing the force strain relationship 40 and the dynamic forces acting on the piston as described in equation (14).…”

Section: Force-induced Strain Theorymentioning

confidence: 99%

“…12,13 Prasad utilized this method to investigate the effect of liquid in a compressor on the piston load. 14 Yaqub proposed an enhanced LPM that considers the temperature variation in a cooler and utilized it to analyze the influence of the capacity control scheme on the COP. 15 Pressure pulsation is the primary contributor to pipeline vibration.…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of a hyper-compressor for vinyl acetate and ethylene mixture using real-fluid properties

Yang,

Zhou,

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The ethylene and vinyl acetate (VA) mixture must be compressed to a high pressure of over 100 MPa in a hyper-compressor system to initiate the polymerization. This paper presents a numerical and experimental investigation into the effects of VA concentration on the performance of a hyper-compressor. To this end, an equation of state in the form of Helmholtz free energy was developed to calculate the real thermodynamic properties of VA–ethylene mixture. The average absolute deviations of density and compressibility factor for VA-ethylene compared with experimental values were 1.82% and 1.46%, respectively. Additionally, a three-dimensional (3D) computational fluid dynamics (CFD) model was constructed considering real-fluid thermodynamics, incorporating the motion of the central valve and upstream and downstream pressure pulsations. The predicted [Formula: see text] diagram and pressure pulsation were compared with experimental data to validate the accuracy of the 3D-CFD model. The results demonstrated that a higher VA weight fraction results in a shorter expansion and compression phase; higher indicated power, suction, and discharge losses; and greater pressure fluctuation. The increment of power loss during the discharge process accounted for 73.27% of the indicated power growth 35.96 kW as the VA weight fraction increased from 0% to 40%. The increment of pressure pulsation in the suction and discharge pipe were mainly attributed to high-frequency pulsations above 10 orders and low-frequency pulsations below 10 orders, respectively.

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Section: Force-induced Strain Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance analysis of a hyper-compressor for vinyl acetate and ethylene mixture using real-fluid properties

Yang,

Zhou,

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…The R22 gas has to be superheated before it reaches the compressor in order to avoid any possibility of liquid entering the compressor which can immediately damage it. 37 Superheat is defined as the difference between the saturation temperature of R22 at a given suction pressure versus the actual temperature of the gas as it exits the evaporator. For ice making purposes and for deep freezers a normal superheat is between 3 C and 4 C. 38,39 When the system starts and water is at 25 C, there are no issues with superheat as there is a large difference between the saturation temp and the actual temp of R22.…”

Section: Superheat Issuesmentioning

confidence: 99%

Performance evaluation and design considerations for a split air-conditioner with built-in thermal energy storage

Ahmad

Islam

Sabir

2018

Building Services Engineering Research and Technology

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The benefits of thermal energy storage using phase change materials are well documented in the literature. Despite all the potential benefits of thermal energy storage, its commercial and widespread application remains limited. This is due to the high initial cost of phase change materials, extensive rework required in buildings, major modifications in HVAC systems, and the potential for leakage, fire and toxicity hazards. There is a strong need for a simple thermal energy storage solution which can be adopted by large number of consumers. Ductless split air-conditioners are portable, low cost, efficient and account for 70% of all air-conditioning systems sold worldwide each year. The present research provides a novel and low cost solution that incorporates thermal energy storage in these air conditioners, allowing them to run without electricity for 3 h. The paper deals with the detailed design aspects and engineering challenges that arise when incorporating thermal energy storage in these small units. A prototype air-conditioner with in-built thermal energy storage was developed, and all performance parameters presented have been validated through data obtained from the prototype. Our results indicate that thermal energy storage can be incorporated in split units in low cost and with minimal drop in overall energy efficiency of the system. Practical application: Incorporating thermal energy storage in split air-conditioners which enables them to run without grid for many hours has immense practical applications. Since around 50% power in any building is consumed by HVAC systems, being able to provide cooling during peak hours without using grid can significantly reduce load on the grid without compromising user comfort. For developing countries where load shedding is frequent, the users can run these air-conditioners without the use of generators or batteries thus saving costs and the environment.

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“…Sami and Aucoin (2003a,b) investigated liquid injection impact on the performance of new alternative refrigerant mixtures such as: R-410A, R-507, R-407C and R-404A. Shiva Prasad (2002) developed a simple method of estimating the cylinder pressure and 'rod load' (force on the crosshead pin, in compressor terminology) in a double-acting reciprocating compressor used in natural gas pipeline and chemical industries. The results showed that the pressure increases with increasing liquid injection.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effects of vapour quality and oil concentration on performance of a swash plate compressor

Wang

Dickson³

2006

Int. J. Energy Res.

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SUMMARYThe main objective of the present study is to experimentally investigate the effects of vapour quality and oil concentration on the performance of a swash plate compressor for automotive air conditioning systems. R-134a is used as refrigerant. The compressor used is a typical automotive swash-plate-type compressor driven by a 10 hp variable-speed electric motor and lubricated by polyalkylene glycol (PAG) oil. The variables measured during the experiment are pressure, temperature, oil concentration, total mass flow rate and vapour mass flow at the inlet and outlet of the compressor. The experiment was performed at varying compressor speeds, compression ratios and vapour quality. The results revealed some unknown aspects of the compression process in an automotive air conditioning system. The vapour quality does not affect volumetric efficiency, but influences isentropic efficiency of the compressor. In the vapour quality range of 80-90%, isentropic efficiency decreases with increasing vapour quality. During the compression process, only a portion of the liquid refrigerant evaporates. However, at the outlet of the compressor, refrigerant/oil mixture never reaches steady state. The evaporation ratio decreases with increasing compressor speed, and with increasing vapour quality as well.

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Effect of Liquid on a Reciprocating Compressor

Cited by 15 publications

References 1 publication

Performance analysis of a hyper-compressor for vinyl acetate and ethylene mixture using real-fluid properties

Performance analysis of a hyper-compressor for vinyl acetate and ethylene mixture using real-fluid properties

Performance evaluation and design considerations for a split air-conditioner with built-in thermal energy storage

Investigation of the effects of vapour quality and oil concentration on performance of a swash plate compressor

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