Flow Analysis of Isobutane (R-600a) Inside an Adiabatic Capillary Tube

Alok, Praveen; Sahu, Debjyoti

doi:10.1088/1757-899x/310/1/012148

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…Therefore, the higher mass flow rate and higher pressure ratio of HFC-134a needs more capillary length than that of HC-600a. 26 The evaporator used in both circuits were copper pipes of diameter 9.525 mm with a total length of 14 m. The copper pipes are alternatively wound around the milk tank surrounded by the IBT.…”

Section: Methodsmentioning

confidence: 99%

Charge optimisation of a solar milk chiller with direct current compressors

Sidney

Prabakaran

Lal

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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In view of promoting the utilization of solar photo-voltaic energy for milk chilling application a custom designed milk chiller with DC compressors was fabricated. Two different DC compressors were used operating with HFC-134a and HC-600a refrigerants to ascertain the performance of HFC and HC refrigerants when used in solar powered application. In view of optimizing the performance of both refrigerants, charge optimization was experimentally carried out for both refrigerant circuits. The optimum charge was obtained based on the maximum coefficient of performance and exergy efficiency. When comparing ice formation and coefficient of performance, the HC-600a refrigerant circuit was lower than that of HFC-134a circuit. It was also observed that the total exergy destruction experienced was maximum in the HFC-134a circuit than that of the HC-600a circuit. The magnitude of exergy destruction was found to be maximum in the compressor and then followed by the condenser, evaporator and finally the capillary for both refrigeration circuits. This study showed an efficient way for using the solar power for operating a milk chiller with DC compressors and with ice bank tank to avoid the dependency on batteries.

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Section: Methodsmentioning

confidence: 99%

Charge optimisation of a solar milk chiller with direct current compressors

Sidney

Prabakaran

Lal

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The same has been reported by Alok and Sahu. 32 When the DSC increases, the saturation pressure for the corresponding temperature drops, thus it requires more capillary length. Jabaraj et al 33 also reported similar results for refrigerant mixture of HFC407C/HC600a/HC290.…”

Section: Prediction Of Capillary Length For Hfc-134a and Hc-600amentioning

confidence: 99%

Thermal analysis on optimizing the capillary tube length of a milk chiller using DC compressor operated with HFC-134a and environment-friendly HC-600a refrigerants

Sidney

Prabakaran

Lal

2019

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this work, the thermal analysis on optimizing the capillary tube lengths of a dual circuit refrigeration system was carried out experimentally. Two refrigeration circuits were individually operated using two DC powered compressors (HFC-134a and HC-600a) instead of conventional AC powered compressors. The capillary tube optimization was done to maximize the coefficient of performance and exergy efficiency. From the results, it was found that the power consumption and the refrigerant mass flow rate decreases with the increase of capillary tube length for both the HFC-134a and HC-600a circuits, while the refrigeration capacity and coefficient of performance increased up to the capillary tube length of 4.57 m and then decreased. The maximum refrigeration capacity, ice formed, power consumption, and coefficient of performance experienced in the HC-600a circuit were 9.65%, 19.03%, 3.53%, and 7.34% lower than those of the HFC-134a circuit at the optimum capillary tube length. It was also found that at the optimum capillary length, the COP was maximum for the HFC-134a circuit while the exergy efficiency was maximum for the HC-600a circuit. The exergy efficiency of the HC-600a circuit was 11.13% higher than that of the HFC-134a circuit. At the optimum capillary tube length, the total equivalent warming impact values of the HFC-134a and HC-600a circuits were 961.13 kg CO2-eq and 785.77 kg CO2-eq, respectively.

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“…Conventional Vapor Compression Refrigeration (VCR) cycle uses hydro-chlorofluorocarbon or hydrocarbon refrigerant and vapor absorption cycle uses ammonia [2]. The refrigerants used nowadays do not cause any ozone depletion, however, the GWP is considerably high [3]. Magnetic refrigeration is a developing technology, it has sparked great interest due to its environment-friendly working principle and its ability to consume 20% less electricity than the conventional VCR system [4].…”

Section: Introductionmentioning

confidence: 99%

A Review on Magneto-Caloric Materials for Room Temperature Refrigeration

Gombi

Sahu

2020

IJAME

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Magnetic Refrigeration is an environment-friendly technology when compared to the conventional gas compression system known as vapor compression refrigeration system. Room temperature magnetic refrigeration is a technology which relies on a solid material known as the Magneto-Caloric Material (MCM) which exhibits Magneto-Caloric Effect (MCE) near room temperature. The Magneto-Caloric Effect is the change in temperature of a magnetic material when that material is either magnetized/demagnetized adiabatically. This review is focused on the selection of a suitable MCM which exhibits near-room-temperature MCE. It also explains a methodology to estimate the amount of material required, based on the cooling load or refrigeration capacity (RC) calculation

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Flow Analysis of Isobutane (R-600a) Inside an Adiabatic Capillary Tube

Cited by 7 publications

References 11 publications

Charge optimisation of a solar milk chiller with direct current compressors

Charge optimisation of a solar milk chiller with direct current compressors

Thermal analysis on optimizing the capillary tube length of a milk chiller using DC compressor operated with HFC-134a and environment-friendly HC-600a refrigerants

A Review on Magneto-Caloric Materials for Room Temperature Refrigeration

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