Performance assessment of a direct expansion air conditioner working with R407C as an R22 alternative

Fatouh, M.; Ibrahim, Talaat A.; Mostafa, A.

doi:10.1016/j.applthermaleng.2009.07.009

Cited by 31 publications

(15 citation statements)

References 13 publications

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“…The results were expected and are in agreement with previous studies (e.g. Fatouh et al, 2010, Fernando et al, 2004. Initially the difference between the refrigerant temperature in the evaporator and room temperature increases, it corresponds to a higher cooling capacity.…”

Section: Effect Of Room Temperature On Refrigerant Temperaturesupporting

confidence: 82%

“…The increase in mass flow rate due to the increase in room temperature is in agreement with previous studies by Farzad (1990), Rodrigez (1995), Choi et al (2002), andFatouh et al (2010). The mass flow rate increases with Troom due to the increase in the density of the refrigerant (see Section 5.2).…”

Section: Influence Of Room Temperature On Maximum Velocitysupporting

confidence: 81%

“…Fatouh et al (2010) found that, as the temperature of the air surrounding the evaporator increases, the condenser temperature and the mass flow rate increase. They concluded that the increase inthe mass flow rate is due to the increase in vapor density of the refrigerant.…”

Section: Literature Reviewmentioning

confidence: 99%

“…It was found that an increase inthe temperature of the air adjacent to the evaporator, not only increases the refrigerant temperature in the evaporator (Fatouh et al, 2010), but also increases the condensing temperature (Fernando et al,2004). Corberán et al (2011),in their research with propane as the refrigerant, found that the lower the source temperature(evaporator temperature), the lower the density of the refrigerant in the evaporator under the same refrigerant charge.…”

Section: Literature Reviewmentioning

confidence: 99%

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Impacts of Room Temperature on the Performance of a Portable Propane Air Conditioner

Sharifian

Siang

2015

Int. J. Air-Cond. Ref.

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The performance of a portable propane air conditioner system, in which the temperatures of the air passing over the condenser and evaporator are equal, has been experimentally investigated under different room temperatures and refrigerant charge levels. The research has been carried out in a range of room temperatures from 20°C to 35°C and in undercharge, standard charge and overcharge conditions. The results show that, at higher room temperatures, the refrigerant temperature in all parts of the system, the density of the refrigerant at the inlet and outlet of the condenser, mass of the refrigerant in the compressor, the mass flow rate of the refrigerant and the cooling capacity of the system in either the undercharge or full charge condition, the specific cooling capacity of the undercharge system, the useful work of the compressor, and the maximum pressure of the refrigerant increase. The increase in room temperature decreases the density of the refrigerant at the inlet and outlet of the capillary tube, the mass of the refrigerant in the capillary tube, the refrigerant subcooling at the inlet of the capillary tube, the maximum velocity of the refrigerant and the coefficient of performance. In addition, the increase in room temperature at overcharge condition causes an increase in the mass flow rate, cooling capacity and specific cooling capacity to a maximum value followed by their decrease. The most important difference between a portable air-conditioner and a non-portable system is the increase in cooling capacity with an increase in room temperature in full charge condition.

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Section: Effect Of Room Temperature On Refrigerant Temperaturesupporting

confidence: 82%

Section: Influence Of Room Temperature On Maximum Velocitysupporting

confidence: 81%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Impacts of Room Temperature on the Performance of a Portable Propane Air Conditioner

Sharifian

Siang

2015

Int. J. Air-Cond. Ref.

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“…Many of these substitutes are short term. The world is still in the process of finding refrigerants which are good enough not only from the environmental perspective but also from financial, energy and safety consideration in their applications [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Performance and suitability comparisons of some R22 possible substitute refrigerants

Subiantoro

Ooi

Junaidi

2013

8th International Conference on Compressors and Their Systems

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Experimental optimization of replacing R22 with R417A without any other changes in configuration of residential air‐conditioning systems based on energy and exergy analysis

Deymi–Dashtebayaz

Farahnak

Tayyeban

et al. 2022

Env Prog and Sustain Energy

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In this paper, the optimal refrigerant mass charge amount of R417A, as a substitute for R22, was experimentally investigated in a split-type air-conditioner with no changes in system configuration. Experiments were conducted for both refrigerants over a range of mass charge from 500 to 850 g in a 12,000 Btuh À1 split air-conditioner as the case study which is a conventional refrigeration system in residential sector of Iran. In order to study the effect of refrigerant mass charge on performance of refrigeration cycle, energy and exergy analysis were performed to determine cooling capacity, energy efficiency ratio (EER) and exergy efficiency.Results showed that the maximum EER for R22 and R417A are 2.48 and 2.41, and the maximum exergy efficiencies obtained for R22 and R417A are around 7.3% and 7%, respectively. Based on both EER and exergy efficiency, the optimum mass charge for R22 and R417A refrigerants are around 640 g and 650 g, respectively. In addition, it was found that under optimal charge conditions, the cooling capacity, EER and exergy efficiency of the system while working with R417A are lower than R22, just by 2.5%, 3%, and 4.5% respectively. Comparison results indicate that R417A can be considered as a suitable substitute for R22, which can almost provide the same performance without need to change the system components.

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Performance assessment of a direct expansion air conditioner working with R407C as an R22 alternative

Cited by 31 publications

References 13 publications

Impacts of Room Temperature on the Performance of a Portable Propane Air Conditioner

Impacts of Room Temperature on the Performance of a Portable Propane Air Conditioner

Performance and suitability comparisons of some R22 possible substitute refrigerants

Experimental optimization of replacing R22 with R417A without any other changes in configuration of residential air‐conditioning systems based on energy and exergy analysis

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