Characteristics of water vapor turbocompressors applied in refrigeration and heat pump systems

Šarevski, Milan N.; Šarevski, Vasko N.

doi:10.1016/j.ijrefrig.2012.03.014

Cited by 21 publications

(8 citation statements)

References 17 publications

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“…The optimal design of the steam compressor obtained in this work, features a rotational speed of 85 krpm, a peripheral speed of approximately 490 m/s, blade angles in the range -15 andŠarevski [78] analyzed the characteristics of a centrifugal compressor for steam applied in refrigeration and heat pump systems. They found that a pressure ratio of approximately 3.5 is the limiting value for a single stage, and for a temperature lift of 20 • C to 45 • C they found that a two-stage compressor is the optimal solution.…”

Section: Discussionmentioning

confidence: 99%

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Design of centrifugal compressors for heat pump systems

2018

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Section: Discussionmentioning

confidence: 99%

“…In Ref. [78] the optimal blade angles at the impeller exit were found to be in the range -15 • to 0 • with a Mach number at the impeller inlet in the range 0.85 to 0.95. These values are in agreement with those of the present designs.…”

Section: Discussionmentioning

confidence: 99%

Design of centrifugal compressors for heat pump systems

2018

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“…Water is an environmentally friendly refrigerant because it has zero ozone depletion potential (ODP), zero global warming potential (GWP), non-toxicity, and non-flammability [67]. Therefore, water is classified a safe refrigerant, falling into the A1 group as a refrigerant code (R718) [68], [69]. Water also has excellent chemical and thermodynamic properties, so it can be used both below and above its freezing point [68], [70] and [71].…”

Section: Watermentioning

confidence: 99%

“…However, since some industries face difficulties in providing a powerful and efficient compressor (due to blade production, which should overcome radial stress), many different studies have been undertaken to use water as a natural refrigerant to solve obstacles for utilizing water in refrigeration and air conditioning systems [80]. Recently, water (R718) has been used as a natural refrigerant in mechanical compression refrigeration, turbo compression, and ejector air conditioning and refrigeration systems as mentioned in studies undertaken by Li, Piechna [80], Šarevski and Šarevski [69], and Chen, Omer [81]. These studies have revealed that among the refrigerants such as R717, R12, R22, R134a and R290, water (R718) showed the highest coefficient of performance (COP) at high evaporator temperature.…”

Section: Watermentioning

confidence: 99%

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Mechanical Vapour Compression Refrigeration System: Review Part 1: Environment Challenge

Mahmood

Ali

Noor

2020

International Journal of Applied Mechanics and Engineering

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In Australia and others developed countries, concerns about global warming have increased, and these concerns influence the use of refrigerants as working fluids in mechanical vapour compression refrigeration systems. One of the most important aspects of refrigerant selection is to reduce its impact on the environment and the ozone layer. This paper provides a comprehensive review of various theoretical and experimental studies which have been carried out on air conditioning and refrigeration applications to investigate the effect of refrigerants on the environment. The analysis in this paper reveals that alternative refrigerants are the most suitable working fluids that can be used in refrigeration systems to meet the needs of the environment. This study also suggests that natural types of refrigerants such as water, carbon dioxide, and hydrocarbon will play a significant role in protecting the environment and providing alternative friendly refrigerants to be used in refrigeration and air conditioning systems.

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Performance analysis of multistage high‐temperature heat pump cycle

Kim

Hegner

Özuylasi

et al. 2023

Energy Science & Engineering

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High‐temperature heat pumps (HTHPs) that can supply heat at temperatures at and above 200°C have the potential to increase energy efficiency and decrease carbon dioxide (CO2) emissions in industrial processes. In this study, three reversed Rankine cycles using water vapor (R‐718) as the working medium, with different intercooling strategies, were proposed and their performance has been investigated. The thermodynamic performance was estimated under different operating conditions, and the optimal pressure ratio (PR) between compression stages was found to be where both compressors had the same PR. The thermodynamic efficiency, φ, and exergy efficiency, ηexergy, were also analyzed at the optimum PR. The cycles that employed an intercooler between the first and second compression stages (IC cycles) showed higher φ and ηexergy values compared with the spray‐injection cycle. Among the IC cycles, the IC‐in cycle, with an inward flow direction of heat sink to the IC, demonstrated higher efficiency and deliverable temperature, Tsink out, than the spray‐injection and IC‐out cycles. To assess the practical impact of the HTHP cycles on industrial CO2 reduction, the PR for each stage was limited to 2.5. Theoretically, the IC‐in cycle could achieve a coefficient of performance of 5.86 with a Tsink out of 200°C or higher when Tevap and Tcond were at 90°C and 150°C, respectively. Additionally, the study demonstrated that the proposed HTHP system has the potential to reduce CO2 emissions by 8.1% in 2030 for industrial heat supply at temperature up to 200°C, by replacing existing industrial fossil boilers with high‐efficiency HTHP.

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Characteristics of water vapor turbocompressors applied in refrigeration and heat pump systems

Cited by 21 publications

References 17 publications

Design of centrifugal compressors for heat pump systems

Design of centrifugal compressors for heat pump systems

Mechanical Vapour Compression Refrigeration System: Review Part 1: Environment Challenge

Performance analysis of multistage high‐temperature heat pump cycle

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