In this article, we will explore the operation of scroll compressors with vapor injection and economizers, highlighting their advantages and applications. Below, we describe the key aspects of this system:
Design of the Scroll Compressor with Economizer
These compressors are designed with independent connections for suction and discharge ports, enabling the economizer’s operation. This setup uses a solenoid valve to control the flow of refrigerant from the condenser outlet, managing the flow known as “I.”
Flow Control with an Expansion Valve
In the same connection, a thermostatic expansion valve regulates the flow “I” coming from the condenser. This reduces its temperature by lowering its pressure.
Subcooling via a Heat Exchanger (HX)
After passing through the expansion valve, a heat exchanger (HX) cools the liquid refrigerant flow, known as “M,” which originates from the condenser. This subcooling significantly enhances the system’s cooling capacity.
Conversion from Liquid to Vapor and Injection into the Compressor
The flow “I,” which transitions to a vapor state after passing through the HX, is reinjected into the scroll compressor. This process provides additional cooling during compression, making it ideal for applications with high compression ratios, such as refrigeration equipment.
System Advantages
This cycle offers several benefits:
- Increased cooling capacity.
- Improved coefficient of performance (COP) compared to conventional cycles.
- Exceptional efficiency for applications with low evaporation temperatures.
Enhanced Efficiency
The vapor injection and subcooling technology optimize the compressor’s efficiency, simulating a two-stage compression process. Additionally, this system allows capacity modulation under low thermal load conditions by halting vapor injection, serving as a capacity regulation method.
