Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E)

Meramveliotakis, George; Kosmadakis, George; Karellas, Sotiriοs

doi:10.12688/openreseurope.14658.1

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…The first is that the model equations set for electrical consumption are not so accurate for R1234yf due to the under-performance of a specific sub-model (e.g. suction pressure drop 33 ) and the second one has to do with the provided performance polynomials by the manufacturer and their fitting accuracy. In any case, the results seem to be sufficiently accurate with acceptable error margins.…”

Section: Resultsmentioning

confidence: 99%

Methods based on a semi-empirical model for simulating scroll compressors with HFC and HFO refrigerants

Meramveliotakis¹,

Kosmadakis²,

Karellas³

2022

Open Res Europe

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The aim of this work is to evaluate three methodologies regarding semi-empirical scroll compressor modeling for different refrigerants and conduct a comparative analysis of their results and accuracy. The first step is to improve a semi-empirical model for scroll compressors based on established techniques, and further enhance the physical background of some of its sub-processes leading to more accurate predictions. Focus is then given on the compressor operation when changing the refrigerant, proposing three methods in total. The first method refers to the standard model, requiring an optimization process for the calibration of all the model parameters. The second method relies on a reference refrigerant, and also uses optimization procedures, but for the fine-tuning of a small subset of the parameters. The third method is more generalized, without the need of any optimization process for the parameters identification, when fluid change occurs, leading to a very fast approach. Το evaluate the accuracy and verify the applicability of each method also related to the necessary computational time, two scroll compressors each with three different refrigerants are considered (HFCs and HFOs and their blends). The model is evaluated with the available manufacturer data, using R134a as reference refrigerant. The results show that the first method predicts the key indicators with a very high accuracy, with the maximum discrepancy of 2.06%, 4.17% and 3.18 K for the mass flow rate, electric power and discharge temperature respectively. The accuracy of the other two methods is dropping, but within acceptable levels in most of the cases. Therefore, in cases that reduced accuracy can be accepted, the third method is preferred for compressor performance prediction when changing the refrigerant, which provides results at a small fraction of time compared with the other two methods, once the parameters are calibrated for a reference case.

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Section: Resultsmentioning

confidence: 99%

Methods based on a semi-empirical model for simulating scroll compressors with HFC and HFO refrigerants

Meramveliotakis¹,

Kosmadakis²,

Karellas³

2022

Open Res Europe

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“…The heat pump has been tested at steady-state conditions and under different heatsource and sink temperatures (both water and ambient air) to extract its performance at various operating conditions [8]. The next step was to apply the equation-fit approach suggested in IEA-SHC-Task 44 [32], identifying the independent variables in a regression analysis.…”

Section: Heat Pumpmentioning

confidence: 99%

“…Heat-pump technology progressively decreases the carbon footprint even further when employing new low Global Warming Potential (GWP) refrigerants, such as natural refrigerants and new generation hydrofluoroolefins (HFOs) with a GWP even lower than 10 [7,8]. By combining heat pumps with other renewable energy sources, such as solar or geothermal energy [9], builders can further increase the coefficient of performance (COP) and production in buildings, as well as its validation.…”

Section: Introductionmentioning

confidence: 99%

Modeling of an Integrated Renewable-Energy-Based System for Heating, Cooling, and Electricity for Buildings

2023

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An integrated numerical model that describes the operation of a renewable-energy-based system for a building’s heating, cooling, and domestic hot water needs is described in this study. The examined energy system includes a vapor compression multi-source heat pump, PVT collectors, borehole thermal energy storage, and water tanks. Energy balance equations for the collectors and the tanks are coupled with correlations for the heat pump and the piping losses within a thermal network approach. The non-linear system of equations that arises is solved by employing in-house software developed in Python v. 3.7.3. The performance of the numerical tool is validated against measurements collected during the pilot operation of such a system installed in Athens (Greece) for two 5-day periods (summer and winter). It is shown that the proposed model can predict, both qualitatively and quantitatively, the building’s energy system performance, whereas limited deviations from the experimental findings are mostly observed when highly transient phenomena occur. The numerical tool is designed with flexibility in mind and can be easily adapted to accommodate additional energy-system configurations and operational modes. Thus, it can be utilized as a supporting decision tool for new energy systems’ designs and the optimization of existing ones.

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Waste heat upgrading with high-temperature heat pumps for assisting steam generation in ships: Performance, cost and emissions benefits

Kosmadakis,

Meramveliotakis,

Bakalis

et al. 2024

Applied Thermal Engineering

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Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E)

Cited by 5 publications

References 40 publications

Methods based on a semi-empirical model for simulating scroll compressors with HFC and HFO refrigerants

Methods based on a semi-empirical model for simulating scroll compressors with HFC and HFO refrigerants

Modeling of an Integrated Renewable-Energy-Based System for Heating, Cooling, and Electricity for Buildings

Waste heat upgrading with high-temperature heat pumps for assisting steam generation in ships: Performance, cost and emissions benefits

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