A large HVAC (Heating, Ventilation and Air Conditioning) manufacturer has selected HFO-1234ze(E) to replace HFC-134a in a new range of chilled water production and heat pumps using screw compressors.
The new systems are 5 % more efficient than the previous ones, and reach a ESEER (European Seasonal Energy Efficiency Ratio) of 7.7 (for water/water units) and 5 (for air/water units).
Thanks to its thermodynamic properties, HFO-1234ze(E) heat pumps can deliver warm water at 85 C (HFC-134a heat pumps can only reach 65 C), allowing them to recover heat from waste heat to provide sanitary warm water or to feed in district heating.
Recognizing that HFO-1234ze(E) is classified as A2L (mildly flammable), although not flammable at ambient temperature, the manufacturer has taken appropriate safety measures and revised accordingly operating instructions (see also News below).
The next proposed development is the use of HFO-1233zd larger capacities chillers using centrifugal compressors.
Source: Le Moniteur.fr