· Volumetric cooling capacity: R32 has got a significantly higher volumetric cooling capacity than R410A, which can help to reduce the system pipe size and increase the efficiency.
· Density: R32’s density is much smaller than R410A, so the amount of charge is smaller, and since the GWP is measured per kg, the total climate impact from the refrigerant in the system is even smaller than suggested by the GWP.
From the above mentioned, R410A, R32 has a better system efficiency, and it needs a smaller refrigerant charge. The significant problem is that R32 has a high discharge temperature. Its direct consequence is the oil degradation which can cause various compressor failures like bearing seizure, low system and compressor efficiency. So the discharge temperature should be limited at an acceptable level to make sure that system and compressor could work normally. Usually is to control discharge temperature by refrigerant. Liquid injection could be a good solution for high discharge temperature directly. As shown in Figure 2 a portion of the condensed fluid is injected into scroll through an electronic injection valve, which will absorb the heat of intermediate compressed gas to vaporize. Thus the discharge temperature can be lower down effectively. And the injected mass flow rate can be easily modulated by injection valve.
Liquid Injection System
Putting together the afore-mentioned reasons, R32 could be an environment friendly refrigerant for using in AC systems and Heat Pumps.
Danfoss proactively develops product for low-GWP refrigerants, like R32.
Danfoss offers a new range of R32 Scroll compressors on Chillventa 2012. The compressors are tested by customers in China and will be ready now also for tests in Europe.
Our MCHE and MPHE heat exchangers are designed to require a minimal refrigerant charge, which makes them ideal in use with R32. Customers are currently testing our products in their own applications.
Danfoss tested with success line components and developed thermostatic expansion devices. Furthermore controllers and electronic expansion devices are available for test by customers.
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