Thermodynamic Analysis of Two-Phase Ejector as Expansion Device with Dual Evaporator Temperatures on Split Type Air Conditioning Systems: An Advance Study | Chapter 13 | Advanced Aspects of Engineering Research Vol. 7

 This research presents a computational and experimental analysis of reducing compressor effort and boosting cooling capacity to improve the performance coefficient (COP) of split air conditioners (SACs). The expansion device is a two-phase ejector with a revolutionary dual-evaporator temperature design. The mathematical model produced in the EES programme is used in numerical approaches. Thermodynamic analysis is performed in order to meet the ASHRAE Standard requirements for a minimum SAC with a COP of 3.5. As a thermal fluid medium, R-290 is used in the SAC system. A numerical model of the ejector is then created based on the simulation results and installed in a modified SAC system with a cooling capacity of at least 9000 BTU/hour. An experiment was done to assess the ejector's actual performance and its impact on the SAC system's performance. The results demonstrated that the two-phase ejector worked well with the new dual-evaporator temperature system. When compared to traditional split air conditioners that use capillary tube expansion mechanisms, the tested ejector method saves about 35% of energy. The system's COP can reach 5.5, accounting for 39% of the improvement in performance. The use of the COS-SAC dual temperature evaporator system with constant ejector area, which is intended to be used for split AC to replace the accumulator in normal ejector systems, has been successful.

Author(s) Details

M. E. Arsana
Doctoral Engineering Science Study Program, Faculty of Engineering, Udayana University, Denpasar, Bali, Indonesia.

I. G. B. Wijaya Kusuma
Doctoral Engineering Science Study Program, Faculty of Engineering, Udayana University, Denpasar, Bali, Indonesia.

M. Sucipta
Doctoral Engineering Science Study Program, Faculty of Engineering, Udayana University, Denpasar, Bali, Indonesia.

I. N. Suamir
Mechanical Engineering Department, Bali State Polytechnic, Bali, 80364, Indonesia.

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Recent Advancements in Numerical Investigations on Enhancement of Bi-evaporator Compression Refrigeration System Using Ejector as Expansion Device | Chapter 15 | Advanced Aspects of Engineering Research Vol. 2

Many cold storage applications today need different kinds of cooling loads to be connected to the same cooling system. This is achieved by feeding refrigerants into multi-evaporators. To satisfy this requirement, a bi-evaporator single compression system is typically used with individual expansion valves or with multiple expansion valve arrangements. With a growing appetite for energy conservation, the performance of these types of refrigeration systems needs to be further improved. One such approach is to increase the performance of the system by using a two-phase ejector as an expansion mechanism instead of an expansion valve. The efficiency of this ejector-bi-evaporator compression cooling system will be evaluated by energy analysis using MATLAB numerical simulation and compared to the traditional expansion valve-bi-evaporator compression cooling system. R134a will be used as a working fluid to research the influence of the temperature of the evaporator and the temperature of the condenser on the cooling power and the output coefficient. In general, bi-evaporator ejector expansion VCRS efficiency shows marked improvement compared to traditional bi-evaporator VCRS and provides a better cooling solution for efficient cold storage systems that require maintaining cooling loads at various evaporator temperatures.

Author (s) Details

M. Suresh
Department of Mechanical Engineering, SSN College of Engineering, Kalavakkam-603110, Tamil Nadu, India.

B. Rahul
Department of Mechanical Engineering, SSN College of Engineering, Kalavakkam-603110, Tamil Nadu, India.

Sharan Srinivasan
Department of Mechanical Engineering, SSN College of Engineering, Kalavakkam-603110, Tamil Nadu, India.

Vinaya Krishna
Department of Mechanical Engineering, SSN College of Engineering, Kalavakkam-603110, Tamil Nadu, India.

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