Abstract
The purpose of this research is to know the improvement of car air conditioner system performance using an ejector. The study was conducted on a car engine with power 100 PS (74 kW) @ 5000 rpm. The test procedure is carried out under two conditions: the normal refrigeration cycle mode and the refrigeration cycle mode with the ejector. The working fluid used in the refrigeration cycle is R-134a. Performance data was measured on engine revolutions ranging from 1500 - 3000 rpm. Finally, the results showed that ejector usage on AC system generates an increase in the refrigeration effect and coefficient of performance (COP) of 25% and 22%, respectively. This has implications to better cooling capacity and compressor work that is lighter.
Highlights
Nowadays every modern vehicle is equipped with air conditioning system (AC)
The type of air conditioner used in a vehicle is a vapor compression cycle with HFC 134a as its refrigerant. the vapor compression cycle is widely used in vehicles because it has significant efficiency, low refrigerant volume and the weight of circulated refrigerant is small [2]
The results were obtained from the performance testing of the air conditioning system in two operating conditions: normal and with ejector
Summary
Nowadays every modern vehicle is equipped with air conditioning system (AC). The existence of air conditioning has become a primary human need in supporting its daily activities. The type of air conditioner used in a vehicle is a vapor compression cycle with HFC 134a as its refrigerant. The main components of the vapor compression cycle are compressors, two heat exchangers, and expansion valves (TXV). One way that can be done to reduce the car engine load is by increasing the performance of the vapor compression cycle as shown by the increasing value of the refrigeration effect. Experiments using ejectors have been conducted by researchers to improve the performance of vapor compression refrigeration cycles. Experiments and numerical analyzes have been performed to observe the performance of a split AC vapor compression refrigeration cycle that installed ejector devices [11]. The purpose of this research is to improve the performance of car air conditioning system by using ejector as expander. The results are expected to reduce the engine load and fuel consumption of the car when the AC system works
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