amin

the third chapter we learned is second law of thermo dynamics and we used another reference book. in this chapter, we learned about the thermal energy reservoir whoch refer to a hypothetical body with relative large thermal energy capacity such as ocean or sun. we also teached about the first statement of the second law which proposed by kelvin planck. he stated that there must be a heat loss during the course of cycle. Dr aznizam also explained to us about heat engines, heat pump and rerigerator. each of this three mechanism is different in their function. for heat engines it is used deliver heat from high-temperature reservoir to low-temperature reservoir while heat pumps is vice versa. while refrigerator has the same function as heat pump.

for calculating efficiency and cooefficient of perfomance

efficiency can not be more than 1 while COP can be greater than 1

  The first week lecture had been done. Thank you to my lecturer, Dr.Aznizam due to it. for the first week, Dr.Aznizam remind us about the equation on close and open system. Next, we also learned how to made assumptions for the systems. Next, we also learned how to write reference state  that include ( phase, temperature,pressure).  one new thing we learned is state properties do not depend on the path.  

    besides that, the main thing we learned through this week is to draw and label a hypothetical path. Dr,Aznizam remind us that hypothetical path only be used when there are phase changes. last thing we leaarned through the first  week is how to used table B.2 that used for integration formula. 

Dr.Aznizam teached us how the procedure to calculate when there are phase changes (his objective for the the class). for example,if the inlet feed produced 2 difference phase.next he also taught us about estimation and corrrelation of latent heat. he remind us that latent heat must have its value ( means it can't be zero). for the first one is using trouton's rule  for non-polar liquids. we also can use chen's equation but the accuracy is only 2% compare to trouton's rule with 30% accuracy. besides that, we also can use watson's correlation which is require when there are two conditions.lastly Dr.aznizam teached us regarding kopp's rule that use for estimating heat capacity of solid or liquid. for using kopp's rule we have to refer table B.10