Achieving a better energy-efficient automotive air-conditioning system: a review of potential technologies and strategies for vapor compression refrigeration cycle

Sukri, M.F.; Musa, Md. Nor; Senawi, Mohd. Yusoff; Nasution, Henry

doi:10.1007/s12053-015-9389-4

Cited by 36 publications

(15 citation statements)

References 77 publications

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“…However, even harmful, the energy consumption increases to promote the vehicle thermal comfort is an indispensable condition to meet customer expectations. Therefore, it is important to develop new energy efficient air conditioning systems, which aim to reduce the energy consumption by the vehicle engine, improving its performance as a whole [3].…”

Section: Twbmentioning

confidence: 99%

Development of an evaporative cooler system applied to the air conditioning of urban buses

Broliato¹,

Altafini

Costa

2020

Sci. cum Ind.

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Air conditioning for buses is an important incentive tool for the public transport, since it offers comfort to passengers and stimulates the use of this kind of transport which is fundamental to improve urban mobility. Currently, air conditioning equipment for buses is the mechanical vapor compression (MVC) type. However, this kind of system has two main disadvantages: the high financial cost and power consumption by the vehicle engine. The purpose of this study is to develop an evaporative cooler for buses, which is a simple, environmental friendly, low-cost solution that does not use engine power for its operation. The first step was the design and construction of the prototype. The following step was to evaluate the built prototype through performing experimental tests. The prototype presented a saturation efficiency of approximately 70%, airflow rate of 421.5 m³/h and energy consumption of 98.4 W. After determining the prototype technical characteristics, the evaporative cooling system was developed for an urban bus, seeking to meet the air renewal required by ANSI/ASHRAE standard 62.1 and to promote the passenger’s thermal comfort as specified by ISO 7730 and ANSI/ASHRAE Standard 55. The thermal comfort provided by the new cooling system was evaluated through the PMV-PPD indexes. A value of 0.35 was obtained for the PMV index and the PPD index obtained a value of 7, indicating that approximately 93% of the passengers will be satisfied regarding their thermal comfort for the established environmental conditions. The evaporative cooling system had a total energy consumption of approximately 0.4 kW, which represents only 5% of the energy that would be consumed by a MVC system. Therefore, the evaporative cooling performance depends on the climatic conditions of the environment, especially humidity. However, when applied in favorable conditions (low humidity), the evaporative cooling system proved to be a viable solution to replace the MVC systems in buses air-conditioning application, where its main advantage is its positive cost-benefit and energy savings.

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Section: Twbmentioning

confidence: 99%

Development of an evaporative cooler system applied to the air conditioning of urban buses

Broliato¹,

Altafini

Costa

2020

Sci. cum Ind.

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“…Sukri et al [8] reported that the performance improvement in MAC system with SLHX varied depending upon the refrigerant used and working conditions. A thermodynamic study by Herms [9] on the effects of SLHX in VCR cycle using various refrigerants such as R134a, R22, R290, R410A, R600a and R717 reported that the COP of the system increases if refrigerants R134a, R290 and R600a are used and decreases if refrigerants R22 and R717 are used.…”

Section: Fig 1 Comparison Of Vapour Compression Refrigeration Systemmentioning

confidence: 99%

Tuning thermostatic expansion valve for implementing suction line heat exchanger in mobile air conditioning system

Prabakaran

Narayanaswamy

Lal

2019

J Braz. Soc. Mech. Sci. Eng.

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The suction line heat exchanger is introduced in a mobile air conditioning system in order to achieve higher energy efficiency. Recent studies reveal that improvement in the system with suction line heat exchanger greatly depends on refrigerant properties and operating conditions. In this work, suction line heat exchanger was incorporated in a mobile air conditioning system and the spring force in the block-type thermostatic expansion valve of the modified system was adjusted (1) to match with the cooling capacity and (2) to match with the suction degree of superheat of the original system as two different cases. The refrigerant R134a was used in this study. The optimum charge of the mobile air conditioning system using R134a with suction line heat exchanger was experimentally found to be 740 g which was 19.4% higher than that of the original system. At optimum charge level before tuning the thermostatic expansion valve, the coefficient of performance (COP) of the system was increased by 2.8%, while the cooling capacity was reduced by 6%. After retuning the thermostatic expansion valve to match the original cooling capacity, the COP of the system improved by 11.8% with 10.5% lesser power consumption than that of the original system. With retuned thermostatic expansion valve for the original degree of superheating, the cooling capacity and COP of the system were increased by 6.7% and 16.2%, respectively. From this experiment, it is concluded that the mobile air conditioning system using R134a as a refrigerant with suction line heat exchanger performs better with suitable retuning of thermostatic expansion valve for the same degree of superheating than that is tuned for same cooling capacity. Keywords Mobile air conditioning • Thermostatic expansion valve • Suction line heat exchanger • COP List of symbols c pg Specific heat of the vapour refrigerant (kJ kg −1 K −1) c pl Specific heat of the liquid refrigerant (kJ kg −1 K −1) C Heat capacity rate (W K −1) COP Coefficient of performance (−) DBT Dry bulb temperature (°C) DP Pressure drop (bar) DSC Degree of sub-cooling (°C)

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“…Their result showed that R410A and R407C have thermodynamic performance similar to R‐22. Sukri et al, 5 found the performance of the automotive air conditioning system that can be increased through component optimization and control method. Pottker and Hrnjak 6 found the use of heat exchanger sub‐cooler in VCRS is always increasing cooling capacity, the compressor work and superheating.…”

Section: Introductionmentioning

confidence: 99%

A comparative experimental study on the performance of the air‐conditioning system through effective condenser cooling and preheating the refrigerant

Ibrahim

2020

Env Prog and Sustain Energy

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A comparative study was made on air conditioning system performance improvement by effective condenser cooling and preheating the refrigerant. This study was described with the experimental investigation through a test rig fabricated from car air conditioning components. In which slight modifications were made such as compressor has to run by the electric motor with provision to measure power consumption during functioning and condenser fan has to replace with exhaust fan enclosed by the cooling pad in which water is supplied with a controlled flow rate using a water pump. Preheating of refrigerant is done using engine exhaust gas with counterflow heat exchanger setup. Air conditioning test rig was run to achieve the desired cooling effect for two processes. The coefficient of performance (COP) was calculated in both operating conditions for the same cooling effect and comparative study was made. The conclusion revealed that a new cooling method showed higher COP than preheating. By this approach, the percentage increase in heat removal rate up 37% was achieved which results in decreases the compressor running time thus mileage of vehicle can be improved significantly.

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Achieving a better energy-efficient automotive air-conditioning system: a review of potential technologies and strategies for vapor compression refrigeration cycle

Cited by 36 publications

References 77 publications

Development of an evaporative cooler system applied to the air conditioning of urban buses

Development of an evaporative cooler system applied to the air conditioning of urban buses

Tuning thermostatic expansion valve for implementing suction line heat exchanger in mobile air conditioning system

A comparative experimental study on the performance of the air‐conditioning system through effective condenser cooling and preheating the refrigerant

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