CO2 System Heat Recovery

Experimental investigation of heat recovery in CO2 refrigeration / heat pump systems

Due to CO2 low critical temperature and high critical pressure, CO2 refrigeration cycle works as a transcritical cycle, which means part of the cycle is located in supercritical region, where the temperature is independent of its pressure.  This makes the CO2 refrigeration cycle has an optimum gas cooler pressure for every certain working condition.  Moreover, the temperature glide of supercritical CO2 in the supercritical region makes it possible for the CO2 refrigeration cycle to have less irreversibility in a heat recovery process than traditional refrigeration cycles.

A CO2 refrigeration/ heat pump test rig is built and used at the div. of Applied Thermodynamics and Refrigeration to investigate CO2 refrigeration /heat pump systems. The heating capacity can be up to 30 kW. With the test rig, one can perform comprehensive testing for

  • Heat recovery process investigation of a CO2 refrigeration/heat pump systems
  • Component testing (heat exchangers, compressors, etc.)
  • System performance evaluation
Test rig