Investigation on the Performance of Special Purpose Automotive Air-Conditioning System Using Dual Refrigeration Cycle

Title & Authors
Investigation on the Performance of Special Purpose Automotive Air-Conditioning System Using Dual Refrigeration Cycle
Seo, Jae-Hyeong; Bang, You-Ma; Lee, Moo-Yeon;

Abstract
The objective of this study is to investigate the cooling performance of an air-conditioning system for a special purpose vehicle under tropical and severe weather conditions. In order to evaluate and compare the cooling performances, the dual refrigeration cycle using R-134a was tested on a special purpose vehicle with various refrigerant charge amounts and indoor temperatures. The cycle was tested considering indoor cooling speed and compression ratio (discharge pressure), and was optimized at the refrigerant charge amount of 1.5 kg and outdoor temperature of $\small{40.0^{\circ}C}$. The time to reach indoor temperature of $\small{15.0^{\circ}C}$ increased by 86.5% and 38.1%, at the indoor temperatures from $\small{25.0^{\circ}C}$ to $\small{32.5^{\circ}C}$ and from $\small{32.5^{\circ}C}$ to $\small{40.0^{\circ}C}$, respectively. In addition, with the increase in indoor temperature from $\small{25.0^{\circ}C}$ to $\small{40.0^{\circ}C}$, the cooling capacity increased by 7.3%, from 19.1 kW to 20.5 kW, but decreased by 7.0% from 4.67 to 5.1.
Keywords
Cooling Capacity;COP;Refrigerant;R-134a;Vapor Compression Cycle;
Language
Korean
Cited by
References
1.
Yoon, S. H., Park, J. Y., Son, D. Y., Choi, Y. H. and Park, K. S., 2014, "A Numerical Study of Automotive Indoor Thermal Comfort Model According to Boarding Conditions and Parameters Related to HVAC," Trans. Korean Soc. Mech. Eng. A, Vol. 38, No. 9, pp. 979-988.

2.
Jang, E. Y., Lee, J. W. and Lee, S. H., 2012, "Numerical Study of Thermal Comfort in a Vehicle Compartment Using the EHT model," Proceedings of the KSME 2012 Annual Spring Conference, pp. 130-131.

3.
Won, J. P., 2010, "Response to the Convention on Climate Change Replacement Car Air Conditioning System Refrigerant Technology Trends," Magazine of the SAREK, Vol. 39, No. 2, pp. 10-16.

4.
Cho, H. H., Lee, H. S. and Park, C. S., 2013, "Study on the Performance Improvement for an Automobile Air Conditioning System Using Alternative Refrigerant R1234yf," Korean Journal of Air- Conditioning and Refrigeration Engineering, Vol. 25, No. 4, pp. 201-207.

5.
Kim, S. C., 2013, "Performance Characteristics of Vehicle Air Conditioning System Using Internal Heat Exchanger with Inner Fin," Journal of the Korea Academia-Industrial Cooperation Society, Vol. 14, No. 1, pp. 69-73.

6.
Shin, Y. C., Kim, T. J. and Cho, H. H., 2014, "Comparison of Exergy in a Refrigerating System Using R404A and R134a for a Refrigeration Truck with Operating Conditions," Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 26, No. 11, pp. 497-503.

7.
Lee, M. Y., Won, J. P., Lee, D. Y. and Cho, C. W., 2011, "Study on the Performance Characteristics of the Roof Mounted Electrical Air Conditioning System Using Inverter Scroll Compressor," Journal of the Korea Academia-Industrial Cooperation Society, Vol. 12, No. 10, pp. 4308-4313.

8.
SANDEN Co., "SD7H15 & SD7L14 Series," [Online] Available World Wide Web:

9.
Danfoss Co., "Counterfeit Products Brochure T2/TE2," [Online] Available World Wide Web :

10.
World Weather Information Service, World Meteorological Organization, [Online] Available World Wide Web :

11.
Chang, Y. S., Shin, J. Y. and Ro, S. T., 1994, "Performance of Refrigerator Using R134a, R152a and R22/142b," Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 6, No. 1, pp. 39-46.

12.
Choi, E. S. and Park, I. G., 1998, "Effects of Charged Mass of Refrigerant on the Performance of a Home Air-conditioner," Proceedings of the SAREK 1998 Winter Annual Conference, pp. 204-208.

13.
Lee, J. H., Kim, Y. J., Park S. K., Lee, J. C. and Kim, Y. J, 2006, "Effects of the Discharge Angle Variation of 4-Way Cassette A/C on the Indoor Thermal Comfort," Journal of the Korean Society for Fluid Machinery, Vol. 4, No. 2, pp. 1055-1058.

14.
ASHRAE, 2013, Handbook of Fundamentals, American Society of Heating, Refrigeration and Air Conditioning Engineers, Atlanta, pp. 17.8-17.10.