Topic: Refrigeration and Air Conditioning
What is the power of 2 tonne refrigeration system? Latent heat of ice may be taken as 336 kJ/kg and specific heat capacity of water as 4 kJ/kgK.
- A. 7.7 kW
- B. 70 kW
- C. 12.5 kW
- D. 0.7 kW
Answer: A. 7.7 kW
Explanation: One tonne of refrigeration is the rate of heat removal required to freeze 1000 kg (1 metric tonne) of water at 0 °C in 24 hours. Power for 1 Tonne = (1000 kg * 336 kJ/kg) / (24 * 3600 s) = 336,000 / 86,400 = 3.88 kW. For 2 tonnes, power = 2 * 3.88 = 7.77 kW, which approximates to 7.7 kW.