Performance comparison of a refrigerator system using R134a and hydrocarbon refrigerant (HCR134a) with different expansion devices

Aziz, Azridjal; Izzudin,; Mainil, Afdhal Kurniawan

doi:10.1088/1757-899x/237/1/012008

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…4,5 Tetrafluoroethane, CF 3 CH 2 F, also known as R134a, is a HFC compound widely used as refrigerant in automotive air conditioning, domestic refrigeration systems and aerosol applications. 3,6 The R134a molecule has become one of the best substitutes for chlorine-related compounds due to its low GWP value (1430) and an atmospheric lifetime of 13.8 years. 7 That is consequence of the reactivity with hydroxyl radicals (OH • ) found in the troposphere, which leads to smaller atmospheric accumulations.…”

Section: ■ Introductionmentioning

confidence: 99%

Electron Driven Reactions in Tetrafluoroethane: Positive and Negative Ion Formation

Pereira‐da‐Silva

Rodrigues

Ramos

et al. 2021

J. Am. Soc. Mass Spectrom.

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In the search for alternatives to chlorine-containing gases, tetrafluoroethane, CF3CH2F (R134a), a widely used refrigerant gas, has been recognized as a promising substitute for dichlorodifluoromethane, CCl2F2 (R12). When R12 is replaced by R134a, the global warming potential drops from 8100 to 1430, the ozone depletion potential changes from 1 to 0, and the atmospheric lifetime decreases from 100 to 14 years. Electron interactions in the gas phase play a fundamental role in the atmospheric sciences. Here, we present a detailed study on electron-driven fragmentation pathways of CF3CH2F, in which we have investigated processes induced by both electron ionization and electron attachment. The measurements allow us to report the ion efficiency curves for ion formation in the energy range of 0 up to 25 eV. For positive ion formation, R134a dissociates into a wide assortment of ions, in which CF3 + is observed as the most abundant out of seven ions with a relative intensity above 2%. The results are supported by quantum chemical calculations based on bound state techniques, electron-impact ionization models, and electron-molecule scattering simulations, showing a good agreement. Moreover, the experimental first ionization potential was found at 13.10 ± 0.17 eV and the second at around 14.25 eV. For negative ion formation, C2F3 – was detected as the only anion formed, above 8.3 eV. This study demonstrates the role of electrons in the dissociation of R134a, which is relevant for an improvement of the refrigeration processes as well as in atmospheric chemistry and plasma sciences.

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Section: ■ Introductionmentioning

confidence: 99%

Electron Driven Reactions in Tetrafluoroethane: Positive and Negative Ion Formation

Pereira‐da‐Silva

Rodrigues

Ramos

et al. 2021

J. Am. Soc. Mass Spectrom.

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“…The experiments were conducted using a split type air conditioner (compressor power of 0.68 kW, the cooling capacity of 2.6 kW) which was operated using HCR-22 refrigerant as working fluid. The refrigerant consisted of 99.7 % of propane, 0.15 % of butane, and 0.15 % of isobutane [31,32]. An evaporative cooling system was added as an extension to the AC system.…”

Section: Methodology 21 Experimental Methodsmentioning

confidence: 99%

Performance Enhancement of Split Air Conditioner During Evaporative Cooling Application

Mainil

Sulaiman

Mainil

et al. 2021

ARFMTS

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The increase of condenser temperature and pressure in air-conditioning leads to decreased cooling capacity and the increase of power consumption. Evaporative cooling could improve the thermal performance of the system. In this study, the evaporative cooling module was installed before the condenser to reduce the inlet air temperature to the condenser unit. The impact of condenser air temperature on the air conditioning system's overall performance was determined by varying the cooling pad discharge water flowrate of 880, 1040, and 1200 mL/min. The cooling load of 2000 W was employed in this experiment. The obtained results were compared with the air conditioning without an evaporative cooling module. It shows that the coefficient of performance (COP) increases with the increase of discharge water flow rate. The highest COP obtained is 7.09 at the flow rate of 1200 mL/min. The compressor work reduces about 6.57 % as compared with the air conditioner without evaporative cooling application. Besides, the COP increases by 12. 95 % at the highest flow rate.

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“…The results also showed the counter flow achieved the biggest number of transfer units compared to the parallel flow. The refrigeration system performance achieved experimentally by Aziz et al 19 with using different refrigerants R134a and HCR134a, and two expansion devices as expansion valve and capillary tube. In addition, the experimental study was tested by utilizing several lengths 125, 150, and 270 cm.…”

Section: Introductionmentioning

confidence: 99%

The heat exchangers tubes mineral type effect on the refrigeration system performance using different lengths of the capillary tube

Salem

Farhan

Doury

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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An experimental study is conducted to show the influence of the tubes material type of the heat exchanger on the refrigeration system performance. The system is operated by using R134a as a working fluid, 2 mm internal diameter, and different lengths of capillary tubes which were 120, 135, and 150 cm. The experimental results showed that when increasing the refrigerant mass flowrates led to reducing each of the performance coefficient COP, number of transfer unit NTU and evaporator effectiveness ε. However, the highest improvement had appeared for each parameter COP, NTU, and ε which were 21%, 113.38%, and 59.42% respectively at a capillary tube length of 120 cm and [Formula: see text] = 3.19 g/s compared to the length of capillary tube 150 cm. Besides, it was found an increase in [Formula: see text] with the incrementing in the capillary tube length from 120 cm to 150 cm. The biggest percentage of compression power was 23% at the capillary tube length of 150 cm compared to others at [Formula: see text] = 3.71 g/s. Finally, the experimental results of COP and [Formula: see text] were validated by comparing them with other publications.

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Performance comparison of a refrigerator system using R134a and hydrocarbon refrigerant (HCR134a) with different expansion devices

Cited by 4 publications

References 16 publications

Electron Driven Reactions in Tetrafluoroethane: Positive and Negative Ion Formation

Electron Driven Reactions in Tetrafluoroethane: Positive and Negative Ion Formation

Performance Enhancement of Split Air Conditioner During Evaporative Cooling Application

The heat exchangers tubes mineral type effect on the refrigeration system performance using different lengths of the capillary tube

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