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PROPRIETARY MATERIAL. © 2008 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.
14-55
kg/min 439.9kg/s 1573.00.85
kJ/kg )48.25490.286(kW 6
1,2
==
−=
−=
R
R
C
RsRRC
m
m
hhmW
&
&
&&η
The rate of heat absorbed by the R-134a in the evaporator is
kJ/min 1.1042kJ/kg )07.14448.254(kg/min) 439.9()( 41in, =−=−= RRRR hhmQ &&
The rate of heat lost from the air in the evaporator is absorbed by the refrigerant-134a. That is,
outin, QQR&& = . Then, the volume flow rate of the air at the inlet of the evaporator can be determined from
Eq. (1) to be
/minm 44.87 3=⎯→⎯++= 1111 (33.63)002646.0(23.11)
0.84741.1042(43.05)
0.8474VV
VV &&&