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. Taking the average specific and latent heats of bread to be 2.93
kJ/kg-C and 109.3 kJ/kg, respectively, determine the product load. KW

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Step-by-step explanation

Given Data " m=450 gm= 0-45kg (@ , 500 loaves / mo 12 = 22. C ( 2 73 + 22 ) K = 295k JJ= - loc - (273 + ( - 10 ) ) k= 263k latent heat of breadloaves (hlatent ) = 109 . 3 ky to Aug. Sp. heat of bread loaves ( C bread ) = 2 . 98 kj ko .. Mass flow rate of bread = 0.45 / kg x 506 bread bread has mbread = 225 Kq / br . -0.0625 Kq /sec . Heat removed from bread Q bread = Mbread X Cbread X (12-71) = 0.0625 X 2.93 X(295-263 - 15 . 86 KJ / Sec . feat produced due to freezing ( QFreezing ) Qfreezing = mbread X hlatent = 0.0625X109.3 = 6:831 KJ/Sec. . " . Product load or Total heat removed ( (rate ) . ) Quotal = Qbread + Qfreezing 2 5 0 8 6 + 6 . 831 = 12 . 6 9 1 KJ / sec = 12 . 69 1 KW

Q - 2691 KM X 3600_Sec 45688 . 5KJ 45. 6885 MJ br.

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