A) 0.27
B) 0.33
C) 1.27
D) 2.33
Correct Answer: B
Solution :
\[{{\eta }_{HE}}=1-=\frac{{{T}_{2}}}{{{T}_{1\,}}}=0.75\,\,or\,\,\frac{{{T}_{2}}}{{{T}_{1}}}=0.25\] \[{{(COP)}_{\operatorname{Re}f}}=\frac{{{T}_{2}}}{{{T}_{1}}-{{T}_{2}}}=\frac{({{T}_{2}}/{{T}_{1}})}{1-({{T}_{1}}/{{T}_{1}})}=\frac{0.25}{1-0.25}\] \[=\frac{0.25}{0.75}=\frac{1}{3}=0.33\]You need to login to perform this action.
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