(a)
Interpretation:
The minimum temperature of the steam used in the plant should be determined.
Concept introduction:
A heat engine is a system that converts thermal energy into mechanical energy. This is carried out by bringing a high temperature working substance into lower temperature. Heat source courses the working substance to become higher state temperature. Then this working substance produces work while transferring heat to a colder sink and become lower state temperature. During this process, some of thermal energy is converted to work, but lots of energy is lost to the environment.
(b)
Interpretation:
Why is the actual steam temperature probably higher than that calculated in part (a)
Concept introduction:
A heat engine is a system that converts thermal energy into mechanical energy. This is carried out by bringing a high temperature working substance into lower temperature. Heat source courses the working substance to become higher state temperature. Then this working substance produces work while transferring heat to a colder sink and become lower state temperature. During this process, some of thermal energy is converted to work, but lots of energy is lost to the environment.
(c)
Interpretation:
The steam pressure at the temperature calculated in part (a) should be determined assuming that at Th the H2O(g) with H2O(l) is in equilibrium.
Concept introduction:
A heat engine is a system that converts thermal energy into mechanical energy. This is carried out by bringing a high temperature working substance into lower temperature. Heat source courses the working substance to become higher state temperature. Then this working substance produces work while transferring heat to a colder sink and become lower state temperature. During this process, some of thermal energy is converted to work, but lots of energy is lost to the environment.
(d)
Interpretation:
Whether it is possible to devise a heat engine with greater than 100% efficiency or with 100% efficiency should be discussed.
Concept introduction:
A heat engine is a system that converts thermal energy into mechanical energy. This is carried out by bringing a high temperature working substance into lower temperature. Heat source courses the working substance to become higher state temperature. Then this working substance produces work while transferring heat to a colder sink and become lower state temperature. During this process, some of thermal energy is converted to work, but lots of energy is lost to the environment
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