A state of art review on future low global warming potential refrigerants and performance augmentation methods for vapour compression based mobile air conditioning system

Prabakaran, R.; Lal, D. Mohan; Kim, Sung Chul

doi:10.1007/s10973-022-11485-3

Cited by 18 publications

(5 citation statements)

References 188 publications

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“…The heating capacity of the condenser is determined by the product of the refrigerant's mass flow rate and the change in the specific enthalpy across the condenser. The heating capacity exhibited a significant increase of 26.8% from −10 • C to 0 • C, followed by a further increase of 25.0% from 0 • C to 10 • C, and finally increased by 14.3% as the temperature increased from 10 • C to 20 • C. The increases in heating capacity closely mirrored the refrigerant mass flow rate trend, affirming a similar result trend that was also observed by Prabakaran et al [32].…”

Section: Influence Of Ambient Temperature On the Thermal Performance ...supporting

confidence: 87%

“…The heating capacity exhibited a significant increase of 26.8% from −10 °C to 0 °C, followed by a further increase of 25.0% from 0 °C to 10 °C, and finally increased by 14.3% as the temperature increased from 10 °C to 20 °C. The increases in heating capacity closely mirrored the refrigerant mass flow rate trend, affirming a similar result trend that was also observed by Prabakaran et al [32]. The heating capacity of the condenser is determined by the product of the refrigerant's mass flow rate and the change in the specific enthalpy across the condenser.…”

Section: Influence Of Ambient Temperature On the Thermal Performance ...supporting

confidence: 87%

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Viability of an Open-Loop Heat Pump Drying System in South African Climatic Conditions

Ngalonkulu,

Huan

2024

Energies

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Drying agricultural produce consumes a considerable amount of energy. As an energy-efficient system, a heat pump can improve the energy efficiency of the drying process and hence reduce the energy consumption, especially in South Africa, where both sub-tropical and temperate weather conditions dominate. The objective of this research is to experimentally investigate the impacts of weather conditions on the operational conditions and thermal performance of an open-loop air-source heat pump drying system. The experimental investigation was conducted in a climate chamber where the climate conditions were simulated from −10 °C to 20 °C with an interval of 10 °C for the typical temperature range of the harvesting season in South Africa. The findings indicate that ambient temperatures have a significant impact on both the operating conditions and thermal performance of an open-loop heat pump system; the change in ambient temperatures from −10 °C to 20 °C leads to a 141.6% improvement in the suction pressure, a 214.2% increase in the discharge pressure, and 30.1% increase in the compression ratio, as well as a consequent increase of 130.6% in the refrigerant mass flow rate (from 0.0067 to 0.0155 kg/s), resulting in a corresponding increase in the coefficient of performance (COP) of the heat pump drying system by about 42.1%. Therefore, this study suggests that, while using an open-loop air-source heat pump drying system utilising R134a refrigerant is feasible in South Africa, it may be practically limited to regions with warm climates or during warmer seasons.

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Section: Influence Of Ambient Temperature On the Thermal Performance ...supporting

confidence: 87%

Section: Influence Of Ambient Temperature On the Thermal Performance ...supporting

confidence: 87%

Viability of an Open-Loop Heat Pump Drying System in South African Climatic Conditions

Ngalonkulu,

Huan

2024

Energies

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“…Air conditioning systems have emerged as significant contributors to greenhouse gas emissions, making them a prominent source of environmental concern. One of the drawbacks associated with refrigeration systems is the utilization of refrigerants that contribute to global warming and ozone layer depletion (Bordbar et al, 2023;Prabakaran et al, 2023;Sharif et al, 2023). In an effort to mitigate electricity consumption in compression refrigeration cycles, alternative refrigeration cycles have been proposed that operate based on thermal energy (Mungyeko Bisulandu et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Effect of generator temperature on steam ejector performance in renewable refrigeration cycle considering wet steam model and dry steam model

Jiang,

Yin

2024

Int. J. Renew. Energy Dev.

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The rise in global warming has led to an increased utilization of cooling systems. High energy consumption associated with common refrigeration cycles not only contributes to air pollution but also intensifies the consumption of fossil fuels. Consequently, the imperative to conserve energy has become paramount in today's world. One of the methods to decrease energy consumption involves employing systems capable of harnessing waste heat from industries, solar energy, and other sources. The ejector refrigeration cycle (ERC) stands as an example of such systems. In present study, the impact of elevating the generator temperature on various aspects such as flow behavior in the ejector, aerodynamic shocks, entrainment ratio (ER), and entropy production was examined. The investigation encompassed both wet steam model (WSM) and dry steam model (DSM). Based on the findings, it was observed that with an increase in generator temperature, the ER decreases while the production entropy increases. In the WSM, the liquid mass fraction (LMF) also experiences an increase. Additionally, the Mach number distribution in the DSM surpasses that of the WSM and the temperature drop in the DSM is greater compared to the WSM. With the rise in generator temperature from 388 K to 418 K, both the DSM and WSM exhibit a decrease in ER by 52.9% and 58.7%, respectively. Furthermore, the production entropy experiences a substantial increase of 180% and 206% for the DSM and WSM, respectively.

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“…Nevertheless, it is solitarily valid for transportation and storage. Prabakaran et al 4 reported that HFC refrigerants like R32, R152a, and R161 are unsatisfactory as they do not follow environmental protocols. Therefore, suitable synthetic refrigerants are suggested to replace R134a, such as R12234yf and R1234ze(E).…”

Section: Introductionmentioning

confidence: 99%

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

Kuwar

2023

Heat Trans

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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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A state of art review on future low global warming potential refrigerants and performance augmentation methods for vapour compression based mobile air conditioning system

Cited by 18 publications

References 188 publications

Viability of an Open-Loop Heat Pump Drying System in South African Climatic Conditions

Viability of an Open-Loop Heat Pump Drying System in South African Climatic Conditions

Effect of generator temperature on steam ejector performance in renewable refrigeration cycle considering wet steam model and dry steam model

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

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