- #1
Red_CCF
- 532
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Hi
In the textbook I was reading, they were trying to derive the formula for exergy and I got confused. They defined an environment (with constant pressure P0 and constant temperature T0) containing closed system as the overall system that is closed. The closed system undergoes a process and they used first law to write energy balance of the overall system. From that they determined that the change in total internal energy of the environment deltaU as T0deltaS - P0deltaV (first TdS equation). This is where I got confused since I don't understand how, if the temperature and pressure remained constant, how can there by an internal energy change of the environment.
Thank you
In the textbook I was reading, they were trying to derive the formula for exergy and I got confused. They defined an environment (with constant pressure P0 and constant temperature T0) containing closed system as the overall system that is closed. The closed system undergoes a process and they used first law to write energy balance of the overall system. From that they determined that the change in total internal energy of the environment deltaU as T0deltaS - P0deltaV (first TdS equation). This is where I got confused since I don't understand how, if the temperature and pressure remained constant, how can there by an internal energy change of the environment.
Thank you