Abstract:In this article, a new two-stage rolling piston CO 2 compressor was developed. A test rig was designed to measure the performance of this compressor. Based on the measured p-V indicator diagram, the distributions of indicated power and compressor performance under various operating conditions have been analysed in detail. It is shown that the discharge passage loss of the first stage and the suction passage loss of the second stage are much higher than other losses for the tested compressor. The overall effici… Show more
“…Each cylinder is designated as a separate stage, which conveniently combines the compressors for each stage into a single unit. It is useful in systems that require high pressure ratios such as that of the carbon dioxide cycle [207,208].…”
Section: Dual Cylinder and Two-stage Rolling Piston Compressorsmentioning
Rotary compressors have been employed in heating and cooling for more than a century and are ubiquitous in daily life but there has not been any comprehensive record of their development and technological advances. This review paper attempts to provide a comprehensive account of the advances in R&D and design evolution of these rotary compressors since their inception, namely the sliding vane compressor, rolling piston compressor, and their design variants in open literature. This is to showcase the current state-of-the-art for these compressors so that researchers can use it as a basis for future work. Based on authors’ insight, inter-disciplinary research combined with advancements in ‘disruptive’ technology such as artificial intelligence and advancements in additive manufacturing might be a promising research direction to bring about improvements in rotary compressor performance to meet mankind’s growing needs for cooling and heating applications.
“…Each cylinder is designated as a separate stage, which conveniently combines the compressors for each stage into a single unit. It is useful in systems that require high pressure ratios such as that of the carbon dioxide cycle [207,208].…”
Section: Dual Cylinder and Two-stage Rolling Piston Compressorsmentioning
Rotary compressors have been employed in heating and cooling for more than a century and are ubiquitous in daily life but there has not been any comprehensive record of their development and technological advances. This review paper attempts to provide a comprehensive account of the advances in R&D and design evolution of these rotary compressors since their inception, namely the sliding vane compressor, rolling piston compressor, and their design variants in open literature. This is to showcase the current state-of-the-art for these compressors so that researchers can use it as a basis for future work. Based on authors’ insight, inter-disciplinary research combined with advancements in ‘disruptive’ technology such as artificial intelligence and advancements in additive manufacturing might be a promising research direction to bring about improvements in rotary compressor performance to meet mankind’s growing needs for cooling and heating applications.
“…The differences lie in the expansion process line of clearance volume and the pressure jump at turning point from suction process to compression process. The jump is produced by the expansion of high pressure vapour within the clearance volume and is obviously significant for some rotary compressor 12,20 ; however, previous studies have not discussed the issue in detail. Figure 1.Schematic of P-V diagram.…”
Section: Analysis Of Thermodynamic Process and P-v Diagram Of Rotary mentioning
HC290 is a substitute for R22 and R410A for small heat pumps, room air conditioners, and light commercial refrigeration equipment since it has a negligible environmental impact and high efficiency. The performance, P-V diagram and valve dynamic displacement of a rotary compressor using R22 and R290 as the refrigerant, under five different operating conditions, were measured and analyzed in this paper to help understand the characteristics of internal thermodynamic process and the distribution of indicated power losses. Further, a new method for analyzing the P-V diagram of a rotary compressor was proposed. Compared with the R22 compressor, some conclusions about the discharge process starting angle, dynamic variation of pressure in the cylinder, volumetric efficiency, indicated efficiency, and loss distribution of the R290 rotary compressor under high efficiency conditions were given. The performance variation of the R290 compressor under other conditions was explained. Several measures to increase the energy efficiency of the R290 rotary compressor were proposed.
“…Yang et al. 2 studied the two-stage rolling piston CO 2 compressor based on P–V indicator diagrams. Pichler et al.…”
Section: Introductionmentioning
confidence: 99%
“…The primary tool for the determination of reciprocating compressor performance is the pressure-volume (P-V) diagram. Yang et al 2 studied the two-stage rolling piston CO 2 compressor based on P-V indicator diagrams. Pichler et al 3 and Wang et al 4 studied reciprocating compressor valve faults using features extracted from the P-V diagram as inputs to support vector machine (SVM).…”
The failure of suction/discharge valves is the most common cause of unscheduled compressor shutdowns; therefore, the in-time fault diagnosis of valves is crucial to the reliable operation of reciprocating compressors. Major valve faults include leakage, valve flutter, delayed closing, and improper lift. To determine the features for diagnosing these typical valve faults, this paper presents an experimental study of the fault diagnosis of reciprocating compressor valves with acoustic emission technology and simulated valve motion. The measured AE signals and simulated valve motions of normal and failed valves are studied. The results of the fault diagnosis indicate that an earlier occurrence of the suction process can diagnose suction valve leakage and that an earlier occurrence of the discharge process can be used for detecting discharge valve leakage. The leakage also causes an increase in the amplitude of the continuous acoustic emission signal. Valve faults resulting from improper valve lift can be diagnosed by the amplitude of the burst acoustic emission signal. The number of burst acoustic emission signals and the shape of the simulated valve motion can be used to monitor the valve flutter conditions. The location where the valve closes can diagnose a valve-delayed closing fault.
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