Question

(b) An
ammonia refrigerating machine
fitted with an expansion valve works
between
the temperature limits of
-10 °C and 30 °C. The vapour is 95%
dry at the end of isentropic compression
and the fluid leaving the condenser is at
30 °C. Assuming actual COP as 60% of
the theoretical, calculate the kilograms
of ice produced per kW hour at 0 °C
from water at 10 °C. Latent heat of
ice is 335 kJ/kg and Cp (water)
4.2 kJ/kg °C. Ammonia has the
following properties :
t
ng
Sf
(°C)
-10
ha
(kJ/kg)
154.2
341.8
Sg
(kJ/kg) (kJ/kg.K) (kJ/Kg.K)
1450-2 0-8296 5.7550
1486.1 1-4876 5.2624
30
1 Continued​

Answer 1

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