Performance Analysis on CO2 Heat Pump Cycle with a Vortex Tube

Zhao, Jinping; Ning, Jinghong

doi:10.12783/dtmse/smne2016/10582

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Generally, the heat pump system is composed of a compressor, gas cooler, evaporator, and expansion valve. Furthermore, many different expansion devices, such as expansion valve, ejector [1][2][3], vortex tube [4,5], and Tesla turbine [6], have been integrated with the heat pump system. The heat pump performance relies on the optimum gas cooler pressure, so the expansion device plays an important role.…”

Section: Introductionmentioning

confidence: 99%

“…The vortex tube was invented in 1933, and since then, it has been used as a cooling device and gas-type separation [16] and it has been analyzed experimentally [17][18][19] and numerically [20][21][22]. The vortex tube as an expansion valve was introduced in [1,4,5,23,24]. Groll et al [23] analyzed the vortex tube application in the heat pump cycle, and based on their findings, the COP of the heat pump cycle was increased by up to 37% when the vortex tube efficiency was 100%.…”

Section: Introductionmentioning

confidence: 99%

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Exergy Efficiency and COP Improvement of a CO2 Transcritical Heat Pump System by Replacing an Expansion Valve with a Tesla Turbine

2022

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The heat pump system has been widely used in residential and commercial applications due to its attractive advantages of high energy efficiency, reliability, and environmental impact. The massive exergy loss during the isenthalpic process in the expansion valve is a major drawback of the heat pump system. Therefore, the Tesla turbine exergy analysis in terms of transiting exergy efficiency is investigated and integrated with the transcritical heat pump system. The aim is to investigate the factors that reduce exergy losses and increase the coefficient of performance and exergy efficiency. The contribution of this paper is twofold. First, a three-dimensional numerical analysis of the supercritical CO2 flow simulation in the Tesla turbine in three different geometries is carried out. Second, the effect of the Tesla turbine on the coefficient of performance and exergy efficiency of the heat pump system is investigated. The effect of the rotor speed and disk spacing on the Tesla turbine power, exergy loss, and transiting exergy efficiency is investigated. The results showed that at a lower disk spacing, the turbine produces higher specific power and transiting exergy efficiency. In addition, the coefficient of performance (COP) and exergy efficiency improvement in the heat pump system combined with the Tesla turbine are 9.8% and 28.9% higher than in the conventional transcritical heat pump system, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exergy Efficiency and COP Improvement of a CO2 Transcritical Heat Pump System by Replacing an Expansion Valve with a Tesla Turbine

2022

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Numerical benchmark of a Ranque–Hilsch vortex tube working with subcritical carbon dioxide

Oberti

Lagrandeur

Poncet

2023

Energy

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A Thermodynamic-Based Black-Box Modeling Approach for the Comprehensive Analysis of Vortex Tube Applications

Sager,

Petersen,

Wirsum

2024

Energies

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To combat climate change successfully, enhancing existing processes is imperative alongside exploring new regenerative technologies. For this purpose, new components must be considered to improve the efficiency of thermodynamic processes. A promising candidate is the Ranque–Hilsch vortex tube due to its low investment cost and maintenance. Previous research has highlighted the thermodynamic advantages of employing a vortex tube in various applications, such as Brayton cycles or as a replacement for conventional expansion valves. However, to assess the potential of the vortex tube within a thermodynamic process, a computationally efficient but precise model of the vortex tube is required. Existing modeling approaches often fail to accurately predict experimental trends or require information such as geometry data that are not available for potential analyses. Thus, the present study proposes a novel thermodynamic-based black-box modeling approach: the vortex tube efficiency is introduced by incorporating operating and geometrical conditions into a single parameter. The vortex tube efficiency is systematically investigated for different operating conditions and various fluids and compared with available experimental results. The resulting modeling approach allows the qualitative and quantitative prediction of vortex tube behavior for air at various operating pressures and cold gas fractions. Further experimental investigations are required for a comprehensive quantitative description of vortex tubes with different geometries and working fluids.

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Performance Analysis on CO2 Heat Pump Cycle with a Vortex Tube

Cited by 3 publications

References 4 publications

Exergy Efficiency and COP Improvement of a CO2 Transcritical Heat Pump System by Replacing an Expansion Valve with a Tesla Turbine

Exergy Efficiency and COP Improvement of a CO2 Transcritical Heat Pump System by Replacing an Expansion Valve with a Tesla Turbine

Numerical benchmark of a Ranque–Hilsch vortex tube working with subcritical carbon dioxide

A Thermodynamic-Based Black-Box Modeling Approach for the Comprehensive Analysis of Vortex Tube Applications

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