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Analiza rozwiązań sprężarek chłodniczych handlowych średniej i dużej wydajności. Cz. 1, Sprężarki tłokowe

Wesołowski Andrzej

Chłodnictwo i Klimatyzacja

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2024

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nr 4

55--59

PL

Wszystkie sprężarki pracują na tej samej zasadzie, jednak cechują się szerokim zakresem wydajności (różne masowe natężenie przepływu czynnika chłodniczego), mają różne wymiary w zależności od zastosowania i parametrów pracy, rodzaju czynnika chłodniczego, wymaganej mocy na wale sprężarki i przeznaczenia. To wszystko oczywiście wpływa na koszt samego urządzenia i koszty jego eksploatacji.

2

Experimental investigation of the energy efficiency of a linear compressor and comparison with a reciprocating compressor in a small refrigeration system

Kowalczyk Michał Jan, Romaniak Artur, Łęcki Marcin, Gutkowski Artur, Górecki Grzegorz

Archives of Thermodynamics

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2023

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Vol. 44, no 4

243--260

EN

The conducted experimental studies of the linear compressor concerned the cooling capacity, efficiency, and Energy Efficiency Ratio (EER). Linear compressor performance tests were carried out for the supply voltage of 190–265 V and the supply frequency in the range of 45–65 Hz, which allowed the compressor to be tested outside its typical operating range. Modulation of the performance was achieved using an inverter. The full range of performance characteristics of a linear compressor was presented. The results were compared with a reciprocating compressor for similar displacement volume, which achieved lower EER values by an average of 38% for a pressure ratio above 1.7. The power consumption of a linear compressor is on average two times lower than that of a reciprocating compressor.

3

Design optimization for the weight reduction of 2-cylinder reciprocating compressor crankshaft

Arshad Ali, Cong Pengbo, Elsayed Elmenshawy Adham Ahmed Awad, Blumbergs Ilmārs

Archive of Mechanical Engineering

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2021

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LXVIII, nr 4

449--471

EN

This study aims to optimize the 2-cylinder in-line reciprocating compressor crankshaft. As the crankshaft is considered the "bulkiest" component of the reciprocating compressor, its weight reduction is the focus of current research for improved performance and lower cost. Therefore, achieving a lightweight crankshaft without compromising the mechanical properties is the core objective of this study. Computational analysis for the crankshaft design optimization was performed in the following steps: kinematic analysis, static analysis, fatigue analysis, topology analysis, and dynamic modal analysis. Material retention by employing topology optimization resulted in a significant amount of weight reduction. A weight reduction of approximately 13% of the original crankshaft was achieved. At the same time, design optimization results demonstrate improvement in the mechanical properties due to better stress concentration and distribution on the crankshaft. In addition, material retention would also contribute to the material cost reduction of the crankshaft. The exact 3D model of the optimized crankshaft with complete design features is the main outcome of this research. The optimization and stress analysis methodology developed in this study can be used in broader fields such as reciprocating compressors/engines, structures, piping, and aerospace industries.

4

Noise Elimination of Reciprocating Compressors Using FEM, Neural Networks Method, and the GA Method

Chang Y.-C., Chiu M.-C., Xie J.-L.

Archives of Acoustics

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2017

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Vol. 42, No. 2

189--197

EN

Industry often utilizes acoustical hoods to block noise emitted from reciprocating compressors. However, the hoods are large and bulky. Therefore, to diminish the size of the compressor, a compact discharge muffler linked to the compressor outlet is considered. Because the geometry of a reciprocating compressor is irregular, COMSOL, a finite element analysis software, is adopted. In order to explore the acoustical performance, a mathematical model is established using a finite element method via the COMSOL commercialized package. Additionally, to facilitate the shape optimization of the muffler, a polynomial neural network model is adopted to serve as an objective function; also, a Genetic Algorithm (GA) is linked to the OBJ function. During the optimization, various noise abatement strategies such as a reverse expansion chamber at the outlet of the discharge muffler and an inner extended tube inside the discharge muffler, will be assessed by using the artificial neural network in conjunction with the GA optimizer. Consequently, the discharge muffler that is optimally shaped will decrease the noise of the reciprocating compressor.

5

Modyfikacja układu rozrządu sprężarki wahadłowej

Ostapski W., Gawlicki M.

Logistyka

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2015

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nr 3

3669--3679, CD 1

PL

W pracy przedstawiono propozycję modyfikacji wahadłowej sprężarki bezolejowej wg Patent No. 68220, oraz P385734, poprzez zmiany konstrukcji i usytuowania zaworów ssawnych i tłocznych. Modyfikacja miała na celu poprawienie funkcjonalności, głównie zwiększenia wydatku sprężarki bez zmiany gabarytów.

EN

The paper presents a proposal to modify an oil-free circular compressor by Patent No. 68220 and P385734, through changes in the structure and location of the suction and discharge valves. The modification was designed to improve the functionality, mainly to increase the flow rate without changing the dimensions of the compressor.

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The influence of efficiency of the cooling system on the thermodynamic parameters and performance of a two - stage VC 20.96 reciprocating compressor designed to serve as a marine engine starter

Grzelczak M.

Polish Maritime Research

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2013

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nr 4

25--33

EN

The paper presents results of the research related to the analysis of the thermodynamic and flow processes occurring in a prototype VC 20.96 two-stage liquid-cooled reciprocating compressor. The compressor has been developed and manufactured by H. Cegielski Poznan metal works in collaboration with the Poznan University of Technology. The research related to the VC compressor was realized within the KBN 3127/C.T07-6/2002 project titled “Development of design of type-series of reciprocating compressors and their implementation in production”. The basic task of the project was to develop two type-series of liquid- and air- cooled reciprocating compressors of the V- and W- arrangement, designed to serve as marine engine starters. The result of the design work was the manufacturing of two compressors: the VC 20.96 liquid-cooled compressor and the WP 18.80 air-cooled one. The main aim of the research described in this paper was to evaluate the efficiency of the cooling system which uses inter-coolers integrated with the compressing stages and the cooperation of the compressing stages in terms of pressure ratio distribution. Owing to the cooling method, the applied design assumptions enabled to develop a compact compressor fulfilling the assumed operating parameters.

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Selection of efficient monitoring methods for machinery generating high vibration signal disturbance

Barszcz T., Urbanek J., Szumilas Ł.

Diagnostyka

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2010

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nr 4(56)

55-58

EN

Monitoring and diagnostics systems of machinery are increasingly used in many industries. Generally, these systems are responsible for such a machinery like steam turbines, pumps, fans, etc. The increase in efficiency as well as the growing interest of diagnostics systems has expanded the potential markets to other related industries such as mining or metallurgy. This paper presents efficient monitoring methods of machinery generating high vibration signal disturbances. The results have been developed by a diagnostic team, monitoring a reciprocating compressor, which is located on the Baltic Sea oil rig. Important feature of the compressor is existence of strong impacts in the vibration signals. These impulses introduce strong distortion to the signal spectrum. The paper shows that different faults require specific diagnostic methods. The paper shows example of selection of such a method. It is the application of the enhanced resolution envelope analysis for detection of the bearing faults.

PL

Systemy monitoringu i diagnostyki maszyn są coraz powszechniej stosowane w wielu gałęziach przemysłu. Są odpowiedzialne za pracę takich maszyn jak turbiny parowe, pompy, wentylatory i wiele innych. Powiększająca się skuteczność oraz wzrost zainteresowania systemami diagnostycznymi spowodował poszerzenie grona odbiorców na inne pokrewne gałęzie przemysłu takie jak przemysł wydobywczy i hutniczy. Niniejszy artykuł przedstawia efektywne metody monitorowania stanu technicznego maszyn charakteryzujących się silnymi zakłóceniami sygnału drganiowego. Wyniki opracowane zostały przez zespół diagnostów monitorujących kompresor tłokowy, który znajduje się na platformie wiertniczej na Morzu Bałtyckim. Charakterystyczną cechą pracy kompresora jest obecność bardzo silnych impulsów. Impulsy te wprowadzają silne zakłócenia widma sygnałów drgań. W artykule pokazano, że w zależności od typu uszkodzenia konieczny jest dobór specyficznych metod diagnostycznych. Artykuł przedstawia przykłady zastosowania analizy obwiedni o podwyższonej rozdzielczości do wykrywania uszkodzeń łożysk tocznych.

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Vibroakusticeskaa diagnostika i monitoring sostaania porsnevyh masin

Kostukov V., Naumenko A.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

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2008

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Z. 10, Vol. 2

365-372

EN

In the report the methodical fundamentals of vibroacoustics diagnostic of piston compressors operating on dangerous productions, and principles of designing of systems of condition monitoring are reviewed.