HFOS PROPOSED FOR REPLACING HFC-245FA IN LOW TEMPERATURE ORGANIC RANKINE CYCLES

A study compares HFC-245fa to two HFOs, HCFO-1233zd-E and HFO-1336mzz-Z, as a working fluid for ORCs (Organic Rankine Cycle).

HCFO-1233zd-E could reach up to 10.6% higher net cycle efficiencies, and HFO-1336mzz-Z up to 17 % than HFC-245fa over the range of cycle conditions examined.

Larger turbine sizes would however be required : about 7.5%–10.2% with HCFO-1233zd-E and about 30.9%–41.5% with HFO-1336mzz-Z.

The net cycle efficiency increases and the required turbine size decreases relative to HFC-245fa for HCFO-1233zd-E and for HFO-1336mzz-Z at higher evaporating and condensing temperatures.

Source: Science Direct