This paper presents a new NH

3

-H

2

O power cycle which is a simplified kalina cycle. Since it can achieve approximately constant temperature diffference of heat transfer in evaporator and condenser both for heat and cooling sources

the new cycle has a better exergy efficiency as well as a tw techno-economic property. It is suitable for power generation systems with geothermal and low temperature waste heat sources. Thermodynamic analysis of this cycle system is conducted and methods for selecting optimum parameters of the cycle are presented.