Q57
A one tonne refrigerating machine means that
A.
One tonne is the total mass of machine
B.
One tonne refrigerant is used
C.
One tonne of water can be converted into ice
D.
One tonne of ice when melts from and at 0°C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
1 tonne of refrigeration is the rate of heat removal required to freeze a metric ton (1000 kg) of water at 0°C in 24 hours. Based on the heat of fusion being 333.55 kJ/kg, 1 tonne of refrigeration = 13,898 kJ/h = 3.861 kW