Use of compositions comprising 1,1,1,2,3-pentafluoropropane and optionally Z-1,1,1,4,4,4-hexafluoro-2-butene in high temperature heat pumps

摘要

A method for producing heating in a high temperature heat pump is provided comprising condensing a vapor working fluid comprising HFC-245eb and optionally Z-HFO-1336mzz, in a condenser, thereby producing a liquid working fluid. Also a method of raising the maximum feasible condenser operating temperature in a high temperature heat pump apparatus is provided. The method comprises charging the high temperature heat pump with a working fluid comprising HFC-245eb and optionally Z-HFO-1336mzz. Also a high temperature heat pump apparatus is provided containing a working fluid comprising HFC-245eb and optionally Z-HFO-1336mzz. Also a composition is provided comprising: (i) a working fluid consisting essentially of HFC-245eb and optionally Z-HFO-1336mzz; and (ii) a stabilizer to prevent degradation at temperatures of 55°C or above, (iii) a lubricant suitable for use at 55°C or above, or both (ii) and (iii).