please give a detailed explanation for your answers... I really don\'t understan
ID: 1843326 • Letter: P
Question
please give a detailed explanation for your answers... I really don't understand this question...
I would like to know why each one is or is not valid (and if one of the answers for a, b, or c is not valid, than an example of when it would be, if at all)
if you take a picture, please make sure it's readable
thankyou in advance, this question has been puzzling me for weeks
A thin-wall, double-pipe, flow heat exchanger is used to cool oil from Tini to Ta The volume flow (Val and heat capacity ofthe oil water of a known wolume flow tate (Who) is useel cool dhe oil in he heat exchanger, where the output is actually a 100% saturated to steam at (100 C, I atm). In the expressions below, the subscripts and 2 comespond to input (inl and What expressions are valid for d the input and outpu properties orthe oil? 15 pes.l (d) fa, b, and c) (e) (a and b) what expressioes are valid for describing input and oucput peoperties of the water? [5 pts l the (a, b, and c) (e) (a and b)Explanation / Answer
Part 1.
The answer is option e (i.e both a and b).
Heat capacity Cp (kJ/Kg.K) is function of Temperature and pressure, hence to calculate the average heat capacity,
option a is appropriate. Similar is the case for calculation of Density which is also function of temperature and pressure.
The option c is in appropriate as their is no phase change, hence we need not to consider the term (hg) as it is the enthalpy of gas, and here the oil does not undergo phase change.
Part 2:
The option d is correct, (all a,b, c are relevant). The same logic is applied for options a and b as in the case of oil.
But as mentioned in the question the output stage of water is steam, we have to consider the enthalpy change associated with the gas (in this case steam), hence option c is also relevant.
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