Handbook of air conditioning and refrigeration / Shan K

9.20 CHAPTER NINE
FIGURE 9.4 Carnot refrigeration cycle: (a) schematic diagram; (b) gas cycle; (c) vapor cycle.
work done, or
Heat supply � heat rejected � net work done (9.2)
Referring to Fig. 9.4a, in a Carnot refrigeration cycle,
q #1 � q #2 ��W
or q #1 � q #2 � W (9.3)
q #2 � q #1 � W
where q #1 � heat supplied from surroundings per lb (kg) of working substance at temperature T 1;
sign of q #1 is positive
q #2 � heat rejected to sink per lb (kg) of working substance at temperature T 2; sign of q #2
is negative
W � net work done by system; sign is positive, or if it is a work input to system, sign is
negative