The lab is composed of several test benches where different plants can be run and monitored and data can be acquired for a post-processing of the tests results. In particular three systems are now present in the lab: 1) air cycle; 2) cascade cycle; 3) air to air heat pump.
Ciclo in cascata
Air-to-air heat pump
1)Performance analysis of different refrigeration technologies for low termperature applications: air cycle and cascade cycle
Figure 1. Load chamber (freezing unit): a schematic (left side) and a picture (right side).
Figure 2. Ciclo ad Aria
Figure 3. Ciclo in cascata
2) Performance analysis of a reversible air to air heat pump by varying the heat exchanger used as evaporator/condenser: mini-channel heat exchanger
Figure 3. Test rig
Figure 4. A picture of the mini-channel heat exchanger.
Figure 5. Refrigerant velocity (m/s) cut-off contour on the inlet sections of the multiports of the heat exchanger. .
Sono inoltre in corso di svolgimento prove con accumuli termici a base di materiali a cambiamento di fase (PCM, phase change material) che, sfruttando il calore latente di particolari sostanze, permettono l’utilizzo di forni solari anche durante l’assenza/intermittenza della radiazione solare.
The lab is equipped with instrumentation to test refrigeration systems. In particular acquisition systems for temperature, pressure, flow rate and power sensors are available, where labview interfaces are used to elaborate the recorder data. Water heat sources/reservoir are available to manage thermal loads injection and rejection during refrigeration systems operation..