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

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 analisys 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.

Investigation of Modified Ejector Cycle on Residential Air Conditioner With Environmentally Benign Refrigerant of R290

“…Furthermore, the input power, COP and COP improvement were determined using Eqs. (21), (22) and (19), respectively. The figure depicts that the cooling capacities of MEC using motive nozzle diameters of 0.9 and 1.0 mm are below the SC.…”

“…Furthermore, power and COP were calculated using Eqs. (21) and (22) respectively, where cos () is power factor. In the present study, the power factor was 0.8.…”

“…Intensive investigations on those methods are now being carried out. Some of the methods are by adding nanoparticles into the refrigerant to increase the heat transfer process [6][7][8] and using ejector as an expansion device [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Recently, a method of transpiration cooling to enhance the heat transfer process was reported [23].…”

Pengoperasian Mesin Pendingin Untuk Coldstorage Penyimpanan Ikan Beku Di Pt. Dwi Bina Utama Sorong

“…Hal ini agar tidak terjadi liquid back yang dapat mengakibatkan kerusakan pada bagian dalam kompresor. Accumulator yang digunakan dapat meningkatkan kapasitas refrigerasi dengan memastikan refrigeran dalam kondisi superheated, fungsi accumulator ini sependapat dengan Arsana et al, (2018) dalam artikelnya dituliskan superheat dapat meningkatkan kapasitas dan COP mesin.…”