A refrigeration system is to cool bread loaves with an average mass of 350 g from 30 to -10°C at a rate of 1200 loaves per hour by refrigerated air at -30°C. 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 8°C; and (c) the size of the compressor of the refrigeration system, in kW, for a COP of 1.2 for the refrigeration system.
A refrigeration system is to cool bread loaves with an average mass of 350 g from 30 to -10°C at a rate of 1200 loaves per hour by refrigerated air at -30°C. 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 8°C; and (c) the size of the compressor of the refrigeration system, in kW, for a COP of 1.2 for the refrigeration system.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
A refrigeration system is to cool bread loaves with an
average mass of 350 g from 30 to -10°C at a rate of 1200
loaves per hour by refrigerated air at -30°C. 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 8°C;
and (c) the size of the compressor of the refrigeration system,
in kW, for a COP of 1.2 for the refrigeration system.
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