Performance analysis of an oil-injected screw compressor and its application

Fujiwara, Mitsuru; Osada, Yuko

doi:10.1016/0140-7007(95)00008-y

Cited by 51 publications

(31 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This happens because the screw compressor doesn't have any clearance volume at the end of compression process. Our result is similar to those results obtained by Osada and Fujiwara [4] and by Stosic et al [12]. The difference in theoretical and experimental values is attributed to be imperfect nature of ports, wall friction and other frictional losses apart from leakage loss.…”

Section: Discussionsupporting

confidence: 82%

“…Fujiwara and Osada [4] derived the fundamental equations based on standard thermodynamic laws and the laws of perfect gas. The following equations are derived with some modifications and other details are introduced as needed.…”

Section: Compression and Discharge Processmentioning

confidence: 99%

“…Fujiwara and Osada [4] determined the heat transfer coefficient using experimental performance data. In this study, the same methodology is followed.…”

Section: Heat Transfer Coefficientmentioning

confidence: 99%

See 2 more Smart Citations

Mathematical modeling of the working cycle of oil injected rotary twin screw compressor

Seshaiah

Ghosh

Sahoo

et al. 2007

Applied Thermal Engineering

View full text Add to dashboard Cite

Oil injected twin-screw air and gas compressors are widely used for medium pressure applications in many industries. Low cost air compressors can be adopted for compression of helium and special gases, leading to significant cost saving.Mathematical analysis of oil injected twin-screw compressor is carried out on the basis of the laws of perfect gas and standard thermodynamic relations. Heat transfer coefficient required for computer simulation is experimentally obtained and used in performance prediction, when the working medium being air or helium. A mathematical model has been developed for calculating the compressor performance and for validating the results with experimental data. The flow coefficients required for numerical simulation to calculate leakage flow rates are obtained from efficiency verses clearance curves. Effect of some of the compressor operating and design parameters on power and volumetric efficiencies have been analyzed and presented.

show abstract

Section: Discussionsupporting

confidence: 82%

Section: Compression and Discharge Processmentioning

confidence: 99%

See 1 more Smart Citation

Mathematical modeling of the working cycle of oil injected rotary twin screw compressor

Seshaiah

Ghosh

Sahoo

et al. 2007

Applied Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…The main aspects of a detailed computational model for screw machines were established by Taniguchi et al [10], and developments in numerical methods have allowed the investigation of rotor profiles and machine geometries for a range of applications [11][12][13]. The full thermodynamic model of the expander used to investigate the performance of screw machines in the current study is based on the quasi one dimensional analysis of twin-screw machines as described by Stosic and Hanjalic [14,15], which has been extensively validated for compressors for a wide range of working fluids and operating conditions.…”

Section: Twin-screw Expander Modelmentioning

confidence: 99%

Optimisation of power generation cycles using saturated liquid expansion to maximise heat recovery

Read

Smith

Stošić

2016

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

The use of two-phase screw expanders in power generation cycles can achieve an increase in the utilisation of available energy from a low-temperature heat source when compared with more conventional single-phase turbines. The efficiency of screw expander machines is sensitive to expansion volume ratio, which, for given inlet and discharge pressures, increases as the expander inlet vapour dryness fraction decreases. For single-stage screw machines with low inlet dryness, this can lead to underexpansion of the working fluid and low isentropic efficiency. The cycle efficiency can potentially be improved by using a two-stage expander, consisting of a machine for low-pressure expansion and a smaller high-pressure machine connected in series. By expanding the working fluid over two stages, the built-in volume ratios of the two machines can be selected to provide a better match with the overall expansion process, thereby increasing the efficiency. The mass flow rate though both stages must be matched, and the compromise between increasing efficiency and maximising power output must also be considered. This study is based on the use of a rigorous thermodynamic screw machine model to compare the performance of single- and two-stage expanders. The model allows optimisation of the required intermediate pressure in the two-stage expander, along with the built-in volume ratio of both screw machine stages. The results allow specification of a two-stage machine, using either two screw machines or a combination of high-pressure screw and low-pressure turbine, in order to achieve maximum efficiency for a particular power output. For the low-temperature heat recovery application considered in this paper, the trilateral flash cycle using a two-stage expander and the Smith cycle using a high-pressure screw and low-pressure turbine are both predicted to achieve a similar overall conversion efficiency to that of a conventional saturated vapour organic Rankine cycle.

show abstract

“…The oil temperature and injection position had a significant effect on compressor performance, while the air/oil mass ratio and oil viscosity had a negligible effect. Fujiwara and Osada [10] used a heat transfer model to evaluate the influence of oil injection on actual compressor geometries. Results showed that oil droplets had a very small residence time.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation into the Effect of Oil Injection on the Performance of a Variable Speed Twin-Screw Compressor

Wang

et al. 2018

Energies

View full text Add to dashboard Cite

Abstract:In this paper, the effect of oil injection flow rate on the performance of a variable speed twin-screw compressor was investigated experimentally. Comprehensive experiments were conducted at different compressor rotational speeds and oil injection flow rates. As the rotational speed increased from 1000 to 3000 rpm, the compressor volumetric and adiabatic efficiencies increased while the specific power consumption decreased. However, the oil injection flow rate showed different influences on the compressor performance. As the oil injection flow rate increased from 27 to 50 L/min, the adiabatic and volumetric efficiencies increased while the compressor discharge temperature and specific power decreased. Further increases in the oil injection flow rate had little effect on compressor performance at flow rates above 50 L/min. The analysis indicated that the oil injection flow rate was limited by the discharge temperature at low compressor rotational speeds and was a trade-off among two efficiencies and specific power consumption at high rotational speeds.

show abstract

Performance analysis of an oil-injected screw compressor and its application

Cited by 51 publications

References 1 publication

Mathematical modeling of the working cycle of oil injected rotary twin screw compressor

Mathematical modeling of the working cycle of oil injected rotary twin screw compressor

Optimisation of power generation cycles using saturated liquid expansion to maximise heat recovery

Experimental Investigation into the Effect of Oil Injection on the Performance of a Variable Speed Twin-Screw Compressor

Contact Info

Product

Resources

About