Comparative Analysis of Performance between Two Phase Ejector with Accumulator and COS Split Air-Conditioning Dual Evaporator

Arsana, Made Ery and Kusuma, I Gusti Bagus Wijaya and Sucipta, Made and Suamir, I Nyoman (2018) Comparative Analysis of Performance between Two Phase Ejector with Accumulator and COS Split Air-Conditioning Dual Evaporator. In: International Conference on Science and Technology (ICST 2018), 18-19 Oktober 2018, Nusa Dua, Bali.

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Abstract

The purpose of this study is to increase the coefficient of performance (COP) of the split air conditioner (SAC) by reducing the compressor work and increasing cooling capacity which can be achieved with a two phase ejector as an expansion device with novel design dual evaporator temperature. Numerical methods implementing mathematical model developed in EES software. The EES modelling is used to simulate the influence of key parameters of the ejector to overall system performance of the split air conditioner (SAC). Such key parameters include entrainment ratio involving mass flow rate of secondary and primary flow in the ejector and pressure lift ratio comprising pressure in suction and diffuser sections. Performance analysis of the SAC system with a two-phase ejector is performed to reach ASHRAE Standard requirement of a constant COP for SAC application minimum of 3.5. The SAC system simulated is charged with R-290 as the fluid medium of cooling capacity at least 4000 BTU/hr based on numerical model simulation results the ejector is then produced and installed in a modified SAC system. Experimental test system is set to experimentally investigate and comparation analysis the actual performance of the ejector and its effect to the novel design dual evaporator temperature COS-SAC system performance. The SAC system performance with ejector is also found to be significantly improved is about 35 % greater than those of conventional expansion device system.

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