
407Solar Heating and Cooling of Buildings
© 2008 Taylor & Francis Group, LLC
and
f
lc le
=
−
(7.92)
Process II represents the vaporization of the remaining liquid. This is the process during
which heat is removed from the chiller. Thus, the specic refrigeration effect per kilogram
of refrigerant q
r
is
rvelc
(7.93)
In the United States, it is still common practice to measure refrigeration in terms of tons.
One ton is the amount of cooling produced if 1 ton of ice is melted over a period of 24 h.
Since 1 ton = 907.2 kg and the latent heat of fusion of water is 334.9 kJ/kg,
1
24 3 600
3 516 12 000ton
h
=
×
==