| 摘要 |
The invention provides a method of converting heat energy to a more usable form using a multi-component working fluid mixture that contains ammonia and water. The working fluid is operated in a thermodynamic cycle that includes liquid compression ( 30 ), vaporization ( 33 ), expansion through a turbine ( 34 ) and condensing ( 36 ). The multi-component fluid varies in temperature during phase change allowing for the use of counter-flow heat exchangers for the heater ( 33 ), cooler ( 36 ), recuperator and pre-heater ( 32 ). Significant recuperation is possible due to the temperature change during phase change. A pre-heater ( 32 ) can be applied to ensure only single-phase vapour exists within the heater. The invention can be used in conjunction with a biomass combustor or with waste flue gas from an existing industrial process. The coolant exits at a temperature sufficient to allow use in external heating applications or to minimize the size of external heat rejection equipment.
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