Required information

Problem $07\mathrm{.}115-$ DEPENDENT MULTI$-$PART PROBLEM $-$ ASSIGN ALL PARTS.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of $0\mathrm{.}8-$cm$-$outer$-$diameter and $0\mathrm{.}8-$

m $-$long tubes inside which the refrigerant is evaporating at $-20C.$ Air approaches the tube bank in the normal direction at

$0C$ and $1$ atm with a mean velocity of $7\frac{m}{s}.$ The tubes are arranged in$-$line with longitudinal and transverse pitches of $S_L$

$=S_T=1\mathrm{.}5cm.$ There are $25$ rows in the flow direction with $15$ tubes in each row. Assume the mean temperature as $-5C$

and the properties of air at this temperature and $1$ atm are $($Table $A-15)k=0\mathrm{.}02326\frac{W}{m}*K,c_p=1\mathrm{.}006k\frac{J}{k}g*K,=1\mathrm{.}317$

$k\frac{g}{m^3},Pr=0\mathrm{.}7375,=1\mathrm{.}705{10}^{-5}k\frac{g}{m}*s,$ and $Prs=Pr$@$Ts=-20C=0\mathrm{.}7408.$ Also, the density of air at the inlet

temperature of $0C($for use in the mass flow rate calculation at the inlet$)$ is ${}_i=1\mathrm{.}292k\frac{g}{m^3}.$

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Problem $07\mathrm{.}115.$a $-$ Air Cooling in Evaporator of Refrigerator

Determine the refrigeration capacity of this system.

The refrigeration capacity of the system is