Thermodynamic model for reciprocating compressors with the focus on fluid dependent efficiencies

Roskosch, Dennis; Venzik, Valerius; Atakan, Burak

doi:10.1016/j.ijrefrig.2017.08.011

Cited by 55 publications

(36 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mass flow rate through valves can be determined by the following equations which have been successfully and widely used as the standard approach for compressors [8,20]:…”

Section: Reciprocating Compressor Sub-modelmentioning

confidence: 99%

“…It is common sense that the setup of spatial mesh size ∆x is carried out by users with a suitable trade-off between accuracy and computational cost. However, the time interval ∆t will be determined by the criterion of Courant-Friedrichs-Lewy applied to each pipe: ∆t ≤ ∆x a + |u| (20) In addition, the input complex amplitudes p * (k) FW i at the k-th period are achieved through transforming the period time history of pressure component p…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…This transformation is primarily deficient in that the needed values must be equally spaced as an array of 2 n (n is an integer), and the first and the last values must be located separately at the beginning and the end of the compressor period. Therefore, time discretization must be performed with a constant value ∆t = t 0 /2 n (t 0 indicates compressor period) and be compatible with Equation (20). It is noteworthy that the equivalent duct is quite short.…”

Section: Numerical Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

A New Hybrid Reciprocating Compressor Model Coupled with Acoustic FEM Characterization and Gas Dynamics

et al. 2019

View full text Add to dashboard Cite

Accurate comprehension of thermodynamic demeanor and pressure pulsation propagation is of great attractiveness in a reciprocating compressor system. To consider the reciprocal interaction between compressor and pipelines, a hybrid numerical model is thus built by coupling the in-cylinder lumped parameter approach, in-pipe 1D gas dynamics and 3D acoustic characteristics of chambers. The transmission and reflection coefficients of a geometrically complex chamber are achieved by the definition of an acoustic characterization method based on acoustic FEM simulation data, with a high level of accuracy. Numerical results of this new hybrid model are compared with predictions from the traditional hybrid model with in-pipe 1D gas dynamics, together with experimental data. Through comparison analysis, the advantages are highlighted in using the acoustic FEM characterization for complex elements since the new model performs numerical solution without introducing any simplifications to the geometry of fluid domain.

show abstract

“…Mass flow rate through valves can be determined by the following equations which have been successfully and widely used as the standard approach for compressors [8,20]:…”

Section: Reciprocating Compressor Sub-modelmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

A New Hybrid Reciprocating Compressor Model Coupled with Acoustic FEM Characterization and Gas Dynamics

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Roskosch et al introduced a differential compressor model for reciprocating compressors, and this model can predict volumetric and isentropic efficiencies quickly. Silva and Deschamps described a model to predict gas leakage of the reed‐type valves of small reciprocating compressors at the condition of incomplete sealing, and they found that the leakage significantly reduced the compressor efficiency even for very small valve clearances.…”

Section: Introductionmentioning

confidence: 99%

The energy performance of a single‐screw compressor for natural gas liquefaction process: Effects of the lubricating oil flow rate

et al. 2019

Int J Energy Res

View full text Add to dashboard Cite

Summary An experimental test system including the oil circulation system and the gas circuit system has been designed and built to explore the effects of the lubricating oil flow rate on the performance of a single‐screw compressor, used in a portable natural gas liquefaction process. Outlet pressure, outlet volumetric flow rate, volumetric efficiency, and specific power rate are the parameters for evaluation of the energy performance of the single‐screw compressor. The experimental results indicate that the outlet pressure and outlet volumetric flow rate can be effectively increased by increasing the flow rate of the lubricating oil at different rotational frequencies and that a certain amount of lubricant oil is helpful to improve the volumetric efficiency. In terms of the specific power rate, the optimum oil‐gas ratios are 0.7%, 0.93%, and 1.79%, and the corresponding outlet pressures are 0.45, 0.45, and 0.48 MPa at the conditions of 50, 40, and 30 Hz, respectively.

show abstract

“…Damle et al (2011) presented a 1D simulation model for a reciprocating compressor and compared the numerical and experimental results. Roskosch et al (2017) introduced a differential compressor model and evaluated the prediction errors of this model, which was used to predict compressor performance for several refrigerant gases. Negrao et al (2011) presented a semi-empirical mathematical model to simulate the unsteady behavior of a reciprocating compressor in refrigerators.…”

Section: Introductionmentioning

confidence: 99%

Efficiency improvement of compressor for refrigerator using 1D CAE and 3D CAE

Nagata

Nagao

2019

Mechanical Engineering Journal

View full text Add to dashboard Cite

This paper describes a new approach to improve compressor efficiency by using 1D CAE and 3D CAE. First, a 1D simulation model of a reciprocating compressor is proposed and the compressor efficiency is analyzed. Then, heat flow in the compressor is analyzed using a 1D thermal network simulation model and the heat receiving process of the refrigerant gas is investigated. Next, gas flow in the compressor is evaluated using 3D CFD and an improved compressor with a new structure is proposed. Finally, the effect of the improved compressor is evaluated through experiments. Results demonstrated that the proposed approach is very effective in actual development.

show abstract

Thermodynamic model for reciprocating compressors with the focus on fluid dependent efficiencies

Cited by 55 publications

References 12 publications

A New Hybrid Reciprocating Compressor Model Coupled with Acoustic FEM Characterization and Gas Dynamics

A New Hybrid Reciprocating Compressor Model Coupled with Acoustic FEM Characterization and Gas Dynamics

The energy performance of a single‐screw compressor for natural gas liquefaction process: Effects of the lubricating oil flow rate

Efficiency improvement of compressor for refrigerator using 1D CAE and 3D CAE

Contact Info

Product

Resources

About