The Exergy Investigation of a Mechanical Vapor Compression Chiller for Cooling Using R410a

Perera, Uthpala A.; Takata, Nobuo; Miyazaki, Takahiko; Higashi, Yukihiro; Thu, Kyaw

doi:10.5109/4372281

Cited by 2 publications

(2 citation statements)

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“…All the flowing refrigerant in a RACHP system passes through the receiver, thus a constant liquid-level is maintained during operation. In non-receiver RACHP systems, overcharging and undercharging the refrigerant will cause higher energy losses, thus lowering the efficiency of system components including the compressor 28) .…”

Section: Equipment Performance and Energy Consumptionmentioning

confidence: 99%

Survey and Review of Refrigerant Leakage Sources and Solutions in Malaysian Refrigeration and Air Conditioning (RAC) Systems

Muradi,

Shazwin Mat Taib,

Saman

et al. 2024

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Leakage of refrigerants is one of the most common faults in refrigeration, air conditioning, and Heat Pump (RACHP) systems. Knowledge of leakage sources is critical for minimizing the leakage of high global warming potential refrigerants and the safe application of flammable refrigerants. Data on leak sources causes, and remedies in the Malaysian cooling and refrigeration industry are lacking. This study aims to investigate the potential leak areas that appear during service and maintenance in Malaysia. A structured questionnaire survey was conducted with the participation of 35 stakeholders in the RACHP. The study found that flare fittings and brazing joints are the most observed leak sources in RACHP systems in Malaysia, causing significant refrigerant emissions and energy losses. A desktop study was conducted to identify leakage prevention solutions. This study categorized the solutions into three main pathways: adherence to best practices, strengthening standards of leak testing and prevention protocols, and utilization of alternative joining methods. The application of these prevention solutions will minimize the direct and indirect impacts of refrigerant leakage.

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Section: Equipment Performance and Energy Consumptionmentioning

confidence: 99%

Survey and Review of Refrigerant Leakage Sources and Solutions in Malaysian Refrigeration and Air Conditioning (RAC) Systems

Muradi,

Shazwin Mat Taib,

Saman

et al. 2024

Evergreen

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“…al. 34) developed an experimental setup for cooling based on vapor compression system and predicted the highest exergy destruction in compressor with R410a as working fluid. Vaibhav et al 35,36) performed exergy investigation of a cascaded vapor compression-absorption cooling cycle considering modified formulation.…”

Section: Introductionmentioning

confidence: 99%

Irreversibility Analysis of an Ejector Refrigeration Cycle by Modified Gouy-Stodola Formulation

Sachdeva¹,

Sharma²,

Anuradha³

et al. 2023

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In this paper, irreversibility analysis of an ejector refrigeration system (ERS) is carried out using modified Gouy-Stodola formulation that incorporates the use of an effective temperature unlike the surrounding temperature employed in classical Gouy-Stodola equation for the irreversibility determination. The components of any system do not transfer heat at surrounding temperature all the times and thus some error is involved in the analysis, as the conventional equation calculates irreversibility using the surrounding temperature. The use of effective temperature provides more accurate measurement of exergy destruction. R1234ze is the refrigerant in this study due to its low Global Warming Potential (GWP) and zero Ozone Depletion Potential (ODP) and is compared with its counterpart R134a. The study is conducted for a fixed 10 kW cooling system. The coefficient of performance (COP) is found to increase by 15.93% and 11.68% for R1234ze and R134a respectively with the change in generator temperature from 91°C to 99°C. However, the drop in COP is 52.38% and 58.54% for R1234ze and R134a respectively with increase in condenser temperature from 32°C to 40°C. It shows that R1234ze performs better than R134a. Due to the highest coefficient of structural bonding (CSB) value in the evaporator, the change in total irreversibility is particularly susceptible to changes in evaporator temperature.

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The Exergy Investigation of a Mechanical Vapor Compression Chiller for Cooling Using R410a

Cited by 2 publications

References 0 publications

Survey and Review of Refrigerant Leakage Sources and Solutions in Malaysian Refrigeration and Air Conditioning (RAC) Systems

Survey and Review of Refrigerant Leakage Sources and Solutions in Malaysian Refrigeration and Air Conditioning (RAC) Systems

Irreversibility Analysis of an Ejector Refrigeration Cycle by Modified Gouy-Stodola Formulation

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