air conditioning system the compressor drive turbine 13 produces 5 5 hp 70 600 rpm and the boiler feed pump drive turbine 82 produces only 0 5 hp 37 000 rpm thus requiring approximately 10 refrigerant vapor flow of the compressor drive turbine 13 flow table 4 below shows optimized parameters of the refrigerant pump 81 driven by refrigerant vapor turbine 82 for a 4 ton hcfc 124 air conditioning system start up of system shown in fig7 requires initiation of refrigerant vapor flow through refrigerant vapor turbine 82 to achieve this the engine must be warmed up to its operating temperature with refrigerant boiler 31 filled with refrigerant fluid at start up the refrigerant fluid is contained in the refrigerant boiler 31 by closing turbine control valve 27 and closed check valve 74 installed in the pump discharge line 75 preventing reverse flow through pump discharge line 75 with hot coolant control valve 53 partially open the heat input into refrigerant boiler 31 starts to generate refrigerant vapor flow which via refrigerant boiler discharge line 28 and with closed turbine control valve 27 forces the refrigerant vapor flow through the refrigerant vapor turbine 82 starting rotation of refrigerant pump 81 and pressurizing the refrigerant pump discharge line 75 which opens the check valve 74 and starts refrigerant circulation through refrigerant boiler 31 further opening of the hot coolant control valve 53 increases the amount of refrigerant vapor flow generated by refrigerant boiler 31 at which point the turbine control valve 27 starts opening and driving the refrigerant vapor turbine 13 which drives the refrigerant compressor 12 and starts producing desired amount of air conditioning cooling the present invention has been described above in terms of preferred embodiments persons skilled in the air condition.