Huang Jintao,Liu Qishou,Wang Yunlu,Chen Tingkuan,Luo Yushan
(School of Energy and Power Engineering,Xi'an Jiaotong Unvierstiy,Xi'an 710049,China)
Abstract:A new combined thermal power and cooling system is developed using the characteristic of low boiling non-azeotropic ammonia-water mixtures. This cycle may produce power as well as refrigeration using relatively low temperature heat sources ranging from 400~450 K.The overall efficiency is 7% higher than the direct power generation with the same heat sources. Solar energy, geothermal and waste heat from power plant may be utilized efficiently. The relationship of the system parameters such as turbine inlet pressure, outlet pressure, temperature of heat source and absorber and the effect of these parameters on the cycle efficiency are analyzed through numerical simulation. The results show that higher initial pressure and lower exhaust pressure will increase the system thermal efficiency linearly, while increase of initial temperature will get higher efficiency first and than decrease gradually.
Keywords:ammonia-water mixtures, combined power and cooling, economical analysis