The cooling produced by melting of 1 ton of ice in a day is
taken as unit of refrigeration (in tons). Now unit of
refrigeration used in S.I. System is KW.
1 ton of refrigeration
= mass of ice x latent heat of ice / 24 hrs

= 900 kg x 335 KJ/Kg ( one short ton = 900 kgs )
------------------
24 x 3600 secs
= 3.4895 KJ/Sec
say 3.5 KJ / Sec = 3.5 KW

In simple 1 tonne refregeration effect of AC is equal to
same amount of cooling which have been achieved by 1 Tonne
of ice block in 1 hour. i.e 3000K.CAL /HR

One Ton of Refrigeration is cooling capacity of a machine
that can freeze one short ton of water at 0 degree celcius
to ice at 0 degree celcius in 24 hrs.

1 tonne AC : it is the capacity of the unit, which can
remove the heat generated in the particular room ,such that
the amount of heat is equivalent to melt the 1 block of ice
(which is weighing 1 tonne).

Bhel supervision exam question:
If 2 generators are working in a network. And if suddenly the
field of anyone generator weakens. What will happen in the network?
1. The generator will run as motor
2. The generator will run as motor in reverse direction
3. The generator will take lighter load
4. The generator will take more load