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Please note that there is an error in the calculation of the number of moles. The relation should be: N=m/M
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.
&& 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
0.8474 1.1042(43.05)
0.8474 VV