The GUNT trainer demonstrates the critical importance of oil return in refrigeration systems for compressor longevity and reliable operation, using various rising pipe configurations and load conditions.
Product Features
- In refrigeration systems, lubrication oil is carried with compressed refrigerant; oil dissolved in liquid refrigerant flows freely, but in vapor phase oil remains liquid and can accumulate, risking compressor oil starvation
- Maintaining minimum refrigerant velocity in rising pipes is essential to return oil to the compressor; velocity depends on pipe diameter and refrigerant mass flow
- Small diameter rising pipes increase velocity, ensuring oil return even at partial load but cause higher pressure loss at full load
- Double rising pipes compensate by using a bend that collects oil during partial load to block one pipe, forcing refrigerant through the other at higher velocity; at full load the oil is pushed upward allowing flow through both pipes
- Trainer features three transparent rising pipes with different diameters and one double rising pipe arranged at the front for clear observation
- Valve selection allows switching between rising pipes to observe oil transport at varying velocities
- Other refrigeration circuit components positioned at the back for demonstration
- Two compressors connected in parallel enable separate or combined operation to simulate partial and full load conditions
Benefits
- Understand how oil return impacts compressor service life and system reliability
- Visualize oil transport behavior at different pipe diameters and load conditions
- Learn the functional advantage of double rising pipes in maintaining oil return across varying loads
- Hands-on training with realistic refrigeration circuit setup and flexible compressor operation
Why Choose the GUNT Oil Return Trainer?
This trainer provides comprehensive insight into oil return mechanisms in refrigeration systems, demonstrating the impact of pipe design and load management on compressor lubrication and system stability.
