The Chiller R-1234ze(E) is the most efficient alternative to chillers that work with R-134a. R1234ze (E) is one of the most promising HFO options in chillers, with a GWP of 4 and lower flammability than R1234yf.
What should you know about R-1234ze(E) in chillers?
- R1234ze (E) is commonly a component of new low GWP blends.
- The flammability of R1234ze (E) is not critical in heat pump systems in normal operation, and in low humidity it becomes non-flammable.
- The heat transfer coefficient of the evaporator with R1234ze (E) obtained in different geometries appears to be similar to the transfer coefficient of R134a.
- The heat transfer coefficient in the condenser with R1234ze (E) is 10% lower compared to R134a.
- R1234ze (E) pressure drops are always higher compared to R134a and should be considered in Exchanger Optimization.
- If R1234ze (E) is used in R134a systems, some modifications must be made to maintain energy efficiency.
- The use of R1234ze (E) in heat pumps works well, however in this case, its isomer, R1234ze (Z) is more recommended.
- HFO / HFC blends are the HFC replacements requiring the fewest system changes of all the low GWP alternatives.
- Currently, blends of R1234ze (E) are used to replace R134a, R404A and R410A in chillers.
- These mixtures have good energy efficiency and adaptation to existing legislation.
Where to learn all about chillers?
We have prepared a complete training in chilled water installations with chillers.
