83. New Trends in the Field of Automobile Air Conditioning

Janotkova, E.; Pavelek, Miroslav

doi:10.3320/1.2759084

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…After finding its way through expansion "valve" it finally passes on to "evaporator" where it extracts heat from the surroundings or circulating fluid being refrigerated and vaporises to low pressure vapour [10]. Javotkova and Pavelek [11] described the alternate trends in the field of automobile air conditioning, the study was focused on the refrigerant, ventilation, and types of control system installed in the A/C system for internal combustion engines. An assessment was conducted about the most widely used contemporary refrigeration system working with the refrigerant R134a and a promising transcritical refrigeration system employing refrigerant CO2 as its working medium.…”

Section: Vehicle A/c System Descriptionmentioning

confidence: 99%

Investigation into the Effect of Air Conditioning System on SI Engine Emission at different operating conditions

NourEldeen,

Mourad

2024

Journal of Advanced Engineering Trends

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Section: Vehicle A/c System Descriptionmentioning

confidence: 99%

Investigation into the Effect of Air Conditioning System on SI Engine Emission at different operating conditions

NourEldeen,

Mourad

2024

Journal of Advanced Engineering Trends

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“…The main purposes of the use of vehicle air conditioning systems can be listed as heating, cooling and dehumidification processes. Vehicle air conditioning systems basically operate on a vapor compression refrigeration cycle [18]. An ideal vehicle air conditioning (AAC) system provides the appropriate temperature and humidity for human comfort [19].…”

Section: Figure 1 the Vapor-compression Refrigeration System (Vcrs)mentioning

confidence: 99%

Exergy Analyses of Vehicles Air Conditioning Systems for Different Refrigerants

Keven

2023

International Journal of Computational and Experimental Science and Engineering

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There are a limited number of studies in the literature that include detailed exergy analysis of vehicle air conditioning systems. In this study, in order to increase the performance of the air conditioning system in vehicles, a detailed exergy analysis has been made with the assumption that different refrigerants are used. R-134A, R-E245cb2, R-404A, R-1234ze(Z), R-161, R-1234zd(E), R-513A, R-1234ze(E) and R-1234yf has been chosen as the refrigerant. In the analysis, a comparison has been made by considering the environment, performance and safety values. While the COP values of the cycles increase with increasing evaporator temperatures, the COP values decrease at increasing condenser temperatures. On the other hand, exergy efficiency decreases with increasing evaporator and condenser temperatures. Also it is aimed to evaluate all the elements of a vehicle air conditioning system with exergy analysis.

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“…After finding its way through expansion "valve" it finally passes on to "evaporator" where it extracts heat from the surroundings or circulating fluid being refrigerated and vapourises to low pressure vapour [4]. Javotkova and Pavelek [5] described the alternate trends in the field of automobile air conditioning, the study was focused on the refrigerant, ventilation, and types of control system installed in the A/C system for internal combustion engines. An assessment was conducted about the most widely used contemporary refrigeration system working with the refrigerant R134a and a promising transcritical refrigeration system employing refrigerant CO 2 as its working medium.…”

Section: Introductionmentioning

confidence: 99%

“…The t-statistics (t T ) was first calculated using Equation (3) and the components of the equation were gotten from Equations (4) and(5). The pair t-test was used because of the related samples and small sample size in line with the literature[10].…”

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confidence: 99%

Investigation of the Effects of Air-Conditioning System on the Temperature and Speed of Automobile Engine Using Paired T-Test and Regression Analysis

Bamisaye¹,

Oyerinde²,

Essien³

2019

OALib

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This study investigated the effect of airconditioning system on the temperature and speed of automobile engine before and after the airconditioning system was put to use, while the vehicle was at static position. A 16-valve Nissan engine was used for this study, the engine was first run for 20 minutes before the data are collected. In the first case, the temperatures (˚C) of the engine were taken in the interval of 10 minutes before and after the airconditioning system is run and in the second case, the speeds of the engine were taken under the same conditions. The research hypothesis was formulated for 20 observations to argue that neither temperature nor speed of the engine changes when the airconditioning system is put on and Paired t-Test statistics were used. The obtained result of t-statistics analysis for temperature and speed were −4.0329 and −5.51832 respectively. These results when compared to their critical values at 5 percent significant level, t-Stat critical < −1.73 for temperature and speed, were discovered to be at the rejection region which indicates that the null hypothesis (H t0 and H s0) in each case is rejected and accept that the airconditioning system changes the temperature of the engine. Also, changes in speed requirements of the engine are not immediate and it could be as a result of an increase in fuel consumption due to more load on the engine. The regression correlation coefficients of 0.999996066 and 0.999653453 were obtained for the temperatures and speeds respectively with their R 2 values, 0.999992132 and 0.999307027. The coefficients in the analysis were used to formulate the regression equations; T 2 = 135.640 + 1.025t + 0.496T 1 and N 2 = 634.005 + 3.824t + 0.270N 1 which can be used to forecast the temperatures and speeds of the engine during airconditioning usage giving the initial parameters. How to cite this paper: Bamisaye, O.S., Oyerinde, A.Y. and Essien, U.A. (2019) Investigation of the Effects of AirConditioning System on the Temperature and Speed of Automobile Engine Using Paired T-Test and Regression Analysis.

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83. New Trends in the Field of Automobile Air Conditioning

Cited by 3 publications

References 3 publications

Investigation into the Effect of Air Conditioning System on SI Engine Emission at different operating conditions

Investigation into the Effect of Air Conditioning System on SI Engine Emission at different operating conditions

Exergy Analyses of Vehicles Air Conditioning Systems for Different Refrigerants

Investigation of the Effects of Air-Conditioning System on the Temperature and Speed of Automobile Engine Using Paired T-Test and Regression Analysis

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