Energy Savings in Air Conditioning System Using Ejector: An Overview

2014 ◽  
Vol 493 ◽  
pp. 93-98 ◽  
Author(s):  
Kasni Sumeru ◽  
Luga Martin ◽  
Farid Nasir Ani ◽  
Henry Nasution ◽  
Farid Nasir Ani
Keyword(s):  
Air Conditioning ◽  
Energy Savings ◽  
Waste Heat ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
Vapor Compression Refrigeration Cycle ◽  
Performance System ◽  
Vapor Compression Refrigeration ◽  
Save Energy

There are two ejector configurations described in the present study: ejector refrigeration cycle and the ejector as an expansion device. The use of waste heat from the car engine and industry as a heat-driven energy for air conditioning system in automobile and building can save energy. Although the ejector refrigeration cycle has a low COP, the use of waste heat as a heat-driven energy incurs a lower operational cost compared with vapor compression refrigeration system. In addition, an ejector as an expansion device can be applied in the vapor compression refrigeration cycle to improve the performance system.

scholarly journals Energy, Exergy and Anergy Analysis of Vertical Split Air Conditioner Under experimental ON-OFF Cycling

2019 ◽  
Vol 25 (7) ◽  
pp. 1-20
Author(s):  
Yasser Abdul Lateef Ghani ◽  
Abdul Hadi N. Khalifa
Keyword(s):  
Air Conditioning ◽  
Refrigeration Cycle ◽  
Air Conditioner ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
Labview Software ◽  
Energy Flows ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration ◽  
Arduino Microcontroller

A time series analysis can help to observe the behavior of the system and specify the system faults. In addition, it also helps to explain the various energy flows in the system and further aid in reducing the thermodynamic losses. The intelligent supervisory LabVIEW software can monitor the incoming data from the system by using Arduino microcontroller and calculates the important parameters. Energy, exergy, and anergy analysis present in this paper to investigate the system performance as well as its components. To accomplish this, a 4-ton vertical split air conditioner based on vapor compression refrigeration cycle charged with refrigerant R-22 was modified for experimental analysis. The results showed that during 5400 secs of experimental study, the system shut down once by the software for 5 min. The volumetric and isentropic efficiencies of the compressor were 79.85 % and 64.48 % respectively. The maximum entropy generation was due to the compressor of 3.4 W/K while the maximum anergy was due to the condenser of 1.39 kW. The exergy efficiencies of the compressor, condenser, and the evaporator were 73.57, 40.18, and 47.45 % respectively. The system and Carnot COP were 2.53 and 4.9 respectively. The exergy efficiency of the air conditioning system was 48.7 %.  

Enhancing Air Conditioning Performance Using TiO2 Nanoparticles in Compressor Lubricant

2015 ◽  
Vol 1125 ◽  
pp. 556-560 ◽  
Author(s):  
Sumeru ◽  
Triaji P. Pramudantoro ◽  
Farid Nasir Ani ◽  
Henry Nasution
Keyword(s):  
Air Conditioning ◽  
High Pressures ◽  
Cooling Capacity ◽  
Input Power ◽  
Air Conditioner ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
Air Conditioners ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration

Most air conditioners utilize vapor compression refrigeration cycle in their operation. In this cycle, the compressor is deployed to circulate the refrigerant from low to high pressures. Lubrication is an important aspect in the compressor to lubricate internal parts. Due to their remarkable properties in the thermo-physical and heat transfer capabilities, nanoparticles have prospect to be applied in the refrigeration and air conditioning system. The reliability and solubility nanoparticle of TiO2 in refrigeration systems have been investigated by several by several researchers. By introducing TiO2 nanoparticle in the lubricant, the friction coefficient and input power of the compressor can be decreased. An air conditioner with cooling capacity of 2.5 kW is utilized in the experiment. Five different concentrations of nanoparticle in the lubricant, viz.: 0.1, 0.2, 0.4, 0.5 and 0.6 gram of TiO2 in one liter of lubricant were mixed using a magnetic stirrer. After 10 days, TiO2 nanoparticles in the lubricant were observed its solubility. Furthermore, based on their solubility, TiO2 nanoparticle with concentration of 0.2 g/L was selected in the experiments. The results show that the air conditioner using R290 with TiO2 nanoparticle in the lubricants works normally and the input power of the air conditioner decreases about 3.1% and the cooling capacity and the COP increase about 5.1% and 8.4%, respectively, compared to the system without nanoparticle in the lubricant.

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