What is the enthalpy of a fluid and how is it related to the energy transferred to or from the fluid? I - Enthalpy is the amount of energy per uni...
What is the enthalpy of a fluid and how is it related to the energy transferred to or from the fluid?
I - Enthalpy is the amount of energy per unit of mass of a fluid, expressed in J/kg.
II - Heat added to a fluid increases its enthalpy, and heat extracted from a fluid decreases its enthalpy.
III - When a fluid undergoes a transformation at constant pressure, it exchanges with the surroundings an amount of heat equal to its enthalpy change multiplied by the mass of fluid that passes through the heat exchanger.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) Both I and II are correct.
e) I, II, and III are correct.
I - Enthalpy is the amount of energy per unit of mass of a fluid, expressed in J/kg.
II - Heat added to a fluid increases its enthalpy, and heat extracted from a fluid decreases its enthalpy.
III - When a fluid undergoes a transformation at constant pressure, it exchanges with the surroundings an amount of heat equal to its enthalpy change multiplied by the mass of fluid that passes through the heat exchanger.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) Both I and II are correct.
e) I, II, and III are correct.
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Ed 
A entalpia de um fluido é a quantidade de energia por unidade de massa do fluido, expressa em J/kg. Quando um fluido recebe calor, sua entalpia aumenta, e quando perde calor, sua entalpia diminui. Quando um fluido sofre uma transformação a pressão constante, ele troca com o ambiente uma quantidade de calor igual à mudança de entalpia multiplicada pela massa do fluido que passa pelo trocador de calor. Portanto, a alternativa correta é a letra E) I, II e III estão corretas.
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