Evaluation of Split-Type Air Conditioner Performance under Constant Outdoor Moisture Content and Varied Dry-Bulb Temperature

Setyawan, Andriyanto; Najmudin, Hafid; Badarudin, Apip; Sunardi, Cecep

doi:10.18280/ijht.400521

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…In comparison to R134a, the DME system has a 4.8% higher COP. The range of COP is in accordance with the results of Setyawan et al [14,15].…”

Section: Resultssupporting

confidence: 91%

“…The main performance parameters, namely cooling capacity, work of compression, and COP are analysed to determine the overall performance of both refrigerants under different degrees of subcool and superheat. This method has also been used by Setyawan et al [14,15], Mitrakusuma et al [16], and Setyawan [17,18]. Detailed observation of Table 1 reveals that the cooling capacity of the system using R134a increases with the increase of superheating.…”

Section: Methodsmentioning

confidence: 92%

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Performance comparison of DME and R134a refrigerants in a room air conditioner: Effect of subcool and superheat

Setyawan,

Mitrakusuma,

Simbolon

2024

E3S Web of Conf.

Self Cite

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The demand for environmentally friendly refrigerants arises to anticipate two global environmental issues: global warming and climate change. The use of environmentally friendly refrigerants is one of the efforts to address these issues. This study aims to investigate the possibility of the use of dimethyl ether (DME) for substituting R134a that has been widely used worldwide. The simulation reveals that both subcool and superheat affect the performance of both refrigerants. The cooling capacity of R134a system increases with the increase of subcool and superheat. Meanwhile, even though the cooling capacity of DME increases with the increase of subcool, it decreases with the increase of superheat. For subcool 0C, DME has a coefficient of performance (COP) 4.8% higher than that of R134a although the cooling capacity is 4.5% lower. When the subcool is set at 8C, the cooling capacity of DME is 6.5% lower than R134a but the COP is 2.6% higher. Another important finding in this study is that the best performance of DME over R134a is obtained at low subcool and low superheat.

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“…In comparison to R134a, the DME system has a 4.8% higher COP. The range of COP is in accordance with the results of Setyawan et al [14,15].…”

Section: Resultssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 92%

Performance comparison of DME and R134a refrigerants in a room air conditioner: Effect of subcool and superheat

Setyawan,

Mitrakusuma,

Simbolon

2024

E3S Web of Conf.

Self Cite

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“…They concluded that the highest cooling capacity was obtained at 100% refrigerant charge for all outdoor temperatures, and the cooling capacity dropped by 3.7% as the outdoor temperature increased from 30 °C to 36 °C. Setyawan et al, [18] experimentally investigated the performance of 2.6 kW cooling capacity air conditioner using R32 with outdoor temperature varied from 24 to 36℃ while maintaining the humidity ratio at 14.9 kg vapour per 1 kg of dry air. They concluded that as the outdoor air temperature increased by 1℃, the power input increased by 1.4%, the cooling capacity decreased by 0.9%, and the coefficient of performance decreased by 1.95%.…”

Section: Introductionmentioning

confidence: 99%

Impact of Ambient Temperature and Humidity on the Performance of Vapour Compression Air Conditioning System - Experimental and Numerical Investigation

Andrew Makar,

Saad Mahmoud,

Raya Al-Dadah

et al. 2024

CFDL

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Due to global warming, population growth, and urbanisation, demands for space cooling in buildings have significantly increased. Mechanical vapour compression cooling technology is relatively mature, well-understood and most commonly used globally. However, they suffer from high energy consumption and adverse environmental impact due to the refrigerants used. As ambient temperature and humidity have significant effects on the performance of vapour compression systems, this paper experimentally and numerically investigates their impact on the performance of vapour compression air conditioning system in terms of power consumption and cooling capacity. It was concluded that at ambient humidity of 55%, as the ambient temperature increases from 22 °C to 40 °C, the compressor temperature has increased from 46 °C to 59 °C which increased its power consumption from 751.2 to 935.52 Watts, giving an increase of 10.24 Watts for every one degree of ambient temperature increase. Also, as ambient humidity in-creased from 32% to 88%, the power consumption increased from 739.2 Watts to 853.2 Watts, an increase of 114 Watts. A validated CFD (Computational Fluid Dynamics) model was developed and predicted a loss in the enthalpy change from 11.7kJ/kg.d.a to 3.6kJ/kg.d.a. due to ambient temperature increasing from 22 °C to 40 °C and a loss of enthalpy change from 12.857kJ/kg.d.a to 5.524kJ/kg.d.a. due to increasing the ambient air humidity from 32% to 88%. This work high-lighted the impacts of ambient conditions on the performance of vapour compression cooling system in terms of increased power consumption and loss of cooling capacity.

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Automatic control of constant temperature and humidity in building air conditioning systems based on frequency domain analysis

Wang

2024

Int. J. Renew. Energy Dev.

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How to solve their automatic control of constant temperature and humidity gradually becomes a research hotspot as the continuous upgrading of air conditioning systems. This study aims to optimize the traditional proportional-integral-differential controller for improvement to solve the time-delay instability phenomenon in temperature and humidity control. The objective of this study is to optimize existing proportional-integral-differential controllers to improve the time-delay instability problem that is common in temperature and humidity control. Firstly, it treats the controlled object as a first-order and second-order system with time-delay characteristics. Next, the Smith predictor controller is generalized equivalent to ensure that the equivalent system does not contain time-delay. Finally, an analysis of the first-order and second-order closed-loop control system is conducted by combining Smith predictive controller and proportional-integral-differential controller. The system achieves the goal of automatic control of constant temperature and humidity by adjusting the control parameters. The experiment showcased that the temperature control time of the proposed control scheme under first-order and second-order time-delays was 16 s and 3 s, respectively. Meanwhile, the humidity control time was 14 s and 13 s, respectively. In practical applications, the proposed control scheme achieved good control effects in all four seasons. This indicates that the controller designed in this study possesses good control performance. It also can achieve the goal of constant temperature and humidity control. This can provide technical support for the automation control of air conditioning systems.

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Evaluation of Split-Type Air Conditioner Performance under Constant Outdoor Moisture Content and Varied Dry-Bulb Temperature

Cited by 3 publications

References 29 publications

Performance comparison of DME and R134a refrigerants in a room air conditioner: Effect of subcool and superheat

Performance comparison of DME and R134a refrigerants in a room air conditioner: Effect of subcool and superheat

Impact of Ambient Temperature and Humidity on the Performance of Vapour Compression Air Conditioning System - Experimental and Numerical Investigation

Automatic control of constant temperature and humidity in building air conditioning systems based on frequency domain analysis

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