What is the heat-transfer rate from the compressor in 
?
Carbon dioxide gas enters a water-cooled compressor at conditions 
= 15(psia) and 
= 50(°F), and is discharged at conditions 
= 520(psia) and 
= 200(°F). The entering 
flows through a 4-inch-diameter pipe with a velocity of 
and is discharged through a 1-inch-diameter pipe. The shaft work supplied to the compressor is 
.
First, we need to determine the velocity of the discharge, 
To do this, the mass flow rate must be determined by using
Using this ?,
Now that 
has been determined,
and converting 
by using 
, you obtain Q = 
To get the heat transfer rate,
Q? = Q ? ? = ?67115 Btu/hr
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