Question

Refer to Q4 and estimate the maximum refrigeration load imposed by this freezing installation assuming the fans but not their motors are in the tunnel.

(a) 50.5 tons of refrigeration

(b) 40.5 tons of refrigeration

(c) 44.5 tons of refrigeration

(d) 55.5 tons of refrigeration

I had been asked this question during an interview for a job.

The origin of the question is Energy Balance Numericals Without Reactions topic in division Energy Balance of Bioprocess Engineering

Answer 1

The correct choice is (c) 44.5 tons of refrigeration

For explanation I would say: With motors outside, the motor inefficiency = (1 – 0.86) does not impose a load on the refrigeration

Total heat load = (104 + [0.86 x 53.7] + 6.3)

= 156 kW

= 44.5 tons of refrigeration.