Semi-empirical and environmental assessment of the low GWP refrigerant HCFO-1224yd(Z) to replace HFC-245fa in high temperature heat pumps

Mateu-Royo, Carlos; Navarro-Esbrí, Joaquin

doi:10.1016/j.ijrefrig.2021.02.018

Cited by 32 publications

(11 citation statements)

References 20 publications

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“…Larger improvements are gained with this drop-in replacement owing to its low GWP, along with its nonflammable nature and lower toxicity. Similar findings were demonstrated by Mateu-Royo et al 101 reinforcing the potentiality of R1224yd(Z) as an attractive replacements for R245fa. Notice that for R245fa drop-in assessment, the NBP performance is computed with reference to its maximization owing to its use in high-temperature applications, as opposed to the low-medium temperature application of the aforementioned cases when finding replacements for R134a, R32 and R152a.…”

Section: Resultssupporting

confidence: 87%

“…The most convenient criterion for analyzing compatibility of drop-in replacements would be merely using VCC under the same VCRC operating conditions, as currently implemented in most works on searching for alternative refrigerants. ,, Similar VCC values between benchmark third generation refrigerant, and low GWP fourth generation replacement signifies their compatibility without the need to retrofit units in existing refrigeration cycle, in particular the compressor …”

Section: Resultsmentioning

confidence: 99%

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Assessment of Low Global Warming Potential Refrigerants for Drop-In Replacement by Connecting their Molecular Features to Their Performance

Albà

Alkhatib

Llovell

et al. 2021

ACS Sustainable Chem. Eng.

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The use of hydrofluorocarbons (HFCs) as an alternative for refrigeration units has grown over the past decades as a replacement to chlorofluorocarbons (CFCs), banned by the Montreal’s Protocol because of their effect on the depletion of the ozone layer. However, HFCs are known to be greenhouse gases with considerable global warming potential (GWP), thousands of times higher than carbon dioxide. The Kigali Amendment to the Montreal Protocol has promoted an active area of research toward the development of low GWP refrigerants to replace the ones in current use, and it is expected to significantly contribute to the Paris Agreement by avoiding nearly half a degree Celsius of temperature increase by the end of this century. We present here a molecular-based evaluation tool aiming at finding optimal refrigerants with the requirements imposed by current environmental legislations in order to mitigate their impact on climate change. The proposed approach relies on the robust polar soft-SAFT equation of state to predict thermodynamic properties required for their technical evaluation at conditions relevant for cooling applications. Additionally, the thermodynamic model integrated with technical criteria enable the search for compatibility of currently used third generation compounds with more eco-friendly refrigerants as drop-in replacements. The criteria include volumetric cooling capacity, coefficient of performance, and other physicochemical properties with direct impact on the technical performance of the cooling cycle. As such, R1123, R1224yd(Z), R1234ze(E), and R1225ye(Z) demonstrate high aptitude toward replacing R134a, R32, R152a, and R245fa with minimal retrofitting to the existing system. The current modeling platform for the rapid screening of emerging refrigerants offers a guide for future efforts on the design of alternative working fluids.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Assessment of Low Global Warming Potential Refrigerants for Drop-In Replacement by Connecting their Molecular Features to Their Performance

Albà

Alkhatib

Llovell

et al. 2021

ACS Sustainable Chem. Eng.

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“…The configuration proposed for the model is a single-stage with an internal heat exchanger (IHX). It is simple robust and commonly seen in HTHPs with a moderate temperature difference between evaporation and condensation [11,17,38]. The IHX is necessary for blends as it is difficult to predict if the compression will be dry with traditional superheating degrees (below 10 K).…”

Section: Simplified Cyclementioning

confidence: 99%

“…Other researchers, such as Yan et al [9], predicted the energy performance of newer refrigerants R-1336mzz(Z) and R-1224yd(Z). Mateu-Royo et al [10][11][12][13] also included R-1233zd(E) when looking for replacements to R-245fa in HTHP, showing promising results. Although the number of low GWP refrigerants is reduced [14,15], some fluids should be taken into deeper research as they can provide better performances at high condensation temperatures than R-134a [16].…”

Section: Introductionmentioning

confidence: 99%

Optimal refrigerant mixture in single-stage high-temperature heat pumps based on a multiparameter evaluation

Fernández-Moreno

Mota-Babiloni

Giménez-Prades

et al. 2022

Sustainable Energy Technologies and Assessments

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“…By identifying the throat pressure, the local fluid velocity is calculated via the definition of stagnation enthalpy, given by Equation (20) and Equation (21).…”

Section: ( )mentioning

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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Semi-empirical and environmental assessment of the low GWP refrigerant HCFO-1224yd(Z) to replace HFC-245fa in high temperature heat pumps

Cited by 32 publications

References 20 publications

Assessment of Low Global Warming Potential Refrigerants for Drop-In Replacement by Connecting their Molecular Features to Their Performance

Assessment of Low Global Warming Potential Refrigerants for Drop-In Replacement by Connecting their Molecular Features to Their Performance

Optimal refrigerant mixture in single-stage high-temperature heat pumps based on a multiparameter evaluation

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

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