The aim of the project is to develop and test a high-temperature heat pump (HTHP) for the
 production of low-pressure process steam (2-4 bar(a)) from industrial waste heat (60-80°C
 water) in the power level of 15-25 kWel and to develop a screw compressor of HFO refrigerant
 vapor. The objectives are: a) analysis of suitable th. cycles and HFO refrigerants with very low
 GWP (<10) and zero ODP, b) development of a custom screw compressor incl. design of rotor
 geometry and vapor injection, c) material compatibility of refrigerants with oils and materials of
 seals, bearings and valves, d) custom design and control system of the HTHP, e) long-term
 experimental lab. operation of the HTHP and compressor at nominal and off-design operating
 parameters, f) techno-economic evaluation of HTHP in CZ ind.