Thermo-economic and environmental analysis of a small capacity vapor compression refrigeration system using R290, R1234yf, and R600a

Paula, Cleison Henrique de; Duarte, Willian Moreira; Rocha, Thiago Torres Martins; Oliveira, Raphael Nunes de; Mendes, Ramon de Paoli; Maia, Antônio Augusto Torres

doi:10.1016/j.ijrefrig.2020.07.003

Cited by 52 publications

(8 citation statements)

References 34 publications

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“…TEWI is defined as the sum of the impact of global warming due to the amount of refrigerant released through leaks plus that of carbon dioxide generated in the power plant by supplying electrical energy to the equipment through its lifetime. The procedure for finding the TEWI for the considered experimental setup of AACS is followed by 29 …”

Section: Numerical Simulation and Analysismentioning

confidence: 99%

Performance evaluation of ecofriendly R1234ze(E) refrigerant in an automotive air conditioning system

Kuwar

2023

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A mathematical model for an air conditioning system used in five‐seater cars is developed with R1234ze(E) and R134a refrigerants, consisting of real system geometry like an evaporator, compressor, condenser, and thermostatic expansion valve. The mathematical model includes refrigerant properties, heat transfer, and pressure loss correlations for two‐phase and single‐phase regions. The performance parameters of a system like evaporator cooling duty, condenser heat loss, compressor power, refrigerant flow rate, and compressor volumetric efficiency obtained from a mathematical model are validated with the results of an experimental facility developed with R134a. The uncertainty analysis performed for the testing facility showed below 11% deviation. The simulation and experimental results showed an overall 10%–15% difference. It is found that the experimental cooling capacity with R134a and numerical cooling capacity with R134a show a 4%–12% variation, experimental cooling capacity with R134a and numerical cooling capacity with R1234ze(E) show a 7%–20% variation, and numerical cooling capacity with R134a and numerical cooling capacity with R1234ze(E) show a 5%–15% variation for the given range of compressor speed (500–1500 rpm), and condensing temperature (26–45°C). The study concluded that R1234ze(E) could potentially replace R134a because it has similar thermophysical properties and an average performance difference of up to 10% with R134a. Due to the limitations of the electric motor used to drive the compressor, tests in the current study were conducted at modest compressor speeds (500–1500 rpm). Future research will focus on experiments with high compressor speed (in the range of 1500–4000 rpm) and R1234yf and R1234ze(E) refrigerants for performance evaluation of automobile air conditioning systems.

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Section: Numerical Simulation and Analysismentioning

confidence: 99%

Performance evaluation of ecofriendly R1234ze(E) refrigerant in an automotive air conditioning system

Kuwar

2023

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“…Makhnatcha et al show that TEWI is simpler than LCCP and the additional contribution of LCCP compared to the TEWI is negligible [25]. Many studies have used TEWI to find the environmental impact of refrigeration systems [23,[26][27][28][29].…”

Section: Global Warming -Quantificationmentioning

confidence: 99%

Refrigerant progression - an investigation into eco-sustainability with evolution and viability of fourth generation refrigerants

Khatoon

Karimi

2022

Journal of Thermal Engineering

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Global warming is one of the most pressing issues the world is facing today. The refrigeration sector, one of the major contributors to global warming, needs to follow a methodological approach to address this issue. This paper evaluates the overall warming impact along with the thermodynamic performance of the different generations of refrigerants in the cascade refrigeration system. The main aim of this comparative study is to present a comprehensive outlook on the environmental impact of refrigerants. A different perspective on refrigerant selection to reduce global warming is also discussed. R600a, R290, R12, R22, R134a, R152a, R245fa, R1234yf, and R1234ze are used in the high-temperature circuit, while R32 is used in the low-temperature circuit. Exergy and energy analyses are done for thermodynamic performance, and total equivalent warming impact (TEWI) assessment is carried out to show global warming produced. While the refrigerant couple R152a/R32 shows the best thermodynamic performance with maximum COP, minimum exergy destruction, and maximum second law efficiency, R1234yf/R32 displays the worst thermodynamic performance. R12/R32 shows maximum TEWI while R290/R32 shows minimum TEWI. The first-generation refrigerants are found to be most environmentally friendly followed by the third and fourth. Fourth-generation refrigerants have the highest indirect emissions, which make their TEWI comparable to R134a. It is concluded that thermodynamic performance plays a significant role in reducing TEWI as indirect emissions account for the major part of the TEWI, and therefore, the global warming potential cannot be the only basis for refrigerant selection. This study suggests that first-generation refrigerants and R152a can be better alternatives.

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“…The authors asserted that CO 2 could be considered a potential future refrigerant for its low emissions, affordability, availability, non-toxicity, non-flammability, and system compactness when nuclear/renewable sources power VCRS (Vapor Compression Refrigeration System). The VCRS model developed by Henrique de Paula et al [18,19] showed, after TEWI analysis, the high environmental performance of R290 for an evaporation temperature of −3 • C and a gas condensation/cooling temperature of 45 • C. The authors claim that the system with R290 also exhibits higher exergy efficiency for the same thermodynamic conditions. According to Vuppaladadiyam et al [20], theoretically, an ideal refrigerant should possess characteristics such as low global warming potential (GWP), non-toxic, non-flammable, and ozone depletion potential (ODP) null.…”

Section: Introductionmentioning

confidence: 99%

Assessing Energy Performance and Environmental Impact of Low GWP Vapor Compression Chilled Water Systems

2023

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The global concern regarding the environmental repercussions of refrigerants has escalated due to their adverse effects. These substances deplete the ozone layer and intensify the greenhouse effect. International agreements such as the Montreal and Kyoto Protocols and COP21 have imposed restrictions on refrigerants with high global warming potential (GWP) to address these issues. This study aims to explore the feasibility, energy efficiency, and environmental impact of utilizing the HFO (hydrofluoric-olefin) refrigerant R1234ze as a substitute for HFCs (hydrofluoric-carbon) (R134a, R407C, and R410A) and HCFCs (R22) in air-cooled vapor compression refrigeration and air conditioning systems. To determine their effectiveness, we evaluate the energy performance of various refrigerant operating cycles across a wide range of ambient and evaporating temperatures. Additionally, we conduct environmental impact analyses based on the total equivalent warming impact (TEWI) parameter calculated for commercially available chillers that utilize the fluids mentioned above. Our findings indicate that vapor compression chilled water systems employing R1234ze exhibit the highest performance coefficient and the lowest annual TEWI.

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Thermo-economic and environmental analysis of a small capacity vapor compression refrigeration system using R290, R1234yf, and R600a

Cited by 52 publications

References 34 publications

Performance evaluation of ecofriendly R1234ze(E) refrigerant in an automotive air conditioning system

Performance evaluation of ecofriendly R1234ze(E) refrigerant in an automotive air conditioning system

Refrigerant progression - an investigation into eco-sustainability with evolution and viability of fourth generation refrigerants

Assessing Energy Performance and Environmental Impact of Low GWP Vapor Compression Chilled Water Systems

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