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A refrigeration system is to cool bread loaves with an average mass of 450 g from 22°C to 10°C at a rate of 500 loaves per hour by refrigerated air at 30°C and 1 atm Taking the average specific and

A refrigeration system is to cool bread loaves with an average mass of 450 g from 22°C to -10°C at a rate of 500 loaves per hour by refrigerated air at -30°C and 1 atm. Taking the average specific and latent heats of bread to be 2.93 kJ/kg · °C and 109.3 kJ/kg, respectively, determine (a) the rate of heat removal from the breads, in kJ/h, (b) the required volume flow rate of air, in m3 /h, if the temperature rise of air is not to exceed °C, and (c) the size of the compressor of the refrigeration system, in kW, for a COP of 1.2 for the refrigeration system.

 

 

 

 

Jul 19 2020 View more View Less

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