(a) Explanation Consider the system is in steady state. Hence, the inlet and exit mass flow rates are equal. The mass flow rate of eggs are as follows. m ˙ 1 = m ˙ 2 = m ˙ eggs Write the energy rate balance equation for one inlet and one outlet system. [ Q ˙ 1 + W ˙ 1 + m ˙ ( h 1 + V 1 2 2 + g z 1 ) ] − [ Q ˙ 2 + W ˙ 2 + m ˙ ( h 2 + V 2 2 2 + g z 2 ) ] = Δ E ˙ system (I) Here, the rate of heat transfer is Q ˙ , the rate of work transfer is W ˙ , the enthalpy is h and the velocity is V , the gravitational acceleration is g , the elevation from the datum is z and the rate of change in net energy of the system is Δ E ˙ system ; the suffixes 1 and 2 indicates the inlet and outlet of the system. Consider the system is at steady state. Hence, the rate of change in net energy of the system becomes zero. Δ E ˙ system = 0 Neglect the work transfer, kinetic, and potential energy changes. The heat transfer occurs from eggs. The eggs cooled by the air i.e. the heat removed from the eggs. Consider, the eggs alone enters the chiller. Here, the mass flow rate of the eggs is m ˙ c . The Equations (I) reduced as follows. [ 0 + 0 + m ˙ eggs ( h 1 + 0 + 0 ) ] − [ Q ˙ 2 + 0 + m ˙ eggs ( h 2 + 0 + 0 ) ] = 0 m ˙ eggs h 1 − ( Q ˙ 2 + m ˙ eggs h 2 ) = 0 m ˙ eggs h 1 − Q ˙ 2 − m ˙ eggs h 2 Q ˙ 2 = m ˙ eggs h 1 − m ˙ eggs h 2 Q ˙ 2 = m ˙ eggs ( h 1 − h 2 ) (II) Write the formula for change in enthalpy ( h 1 − h 2 ) (b) To determine The volumetric flow rate of air, in ft 3 /h , if the temperature rise of air is not to exceed 10 ° F .

9th Edition

ISBN: 9781259822674

Author: Yunus A. Cengel Dr., Michael A. Boles

Publisher: McGraw-Hill Education

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Chapter 5.5, Problem 159RP

(a)

To determine

The rate of heat removal from the eggs, in Btu/h.

(b)

To determine

The volumetric flow rate of air, in ft3/h, if the temperature rise of air is not to exceed 10 °F.

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Chapter 5.5, Problem 158RP

Chapter 5.5, Problem 160RP

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Chapter 5 Solutions

Thermodynamics: An Engineering Approach

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The rate of heat removal from the eggs, in Btu/h .

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The rate of heat removal from the eggs, in Btu/h.

The volumetric flow rate of air, in ft3/h, if the temperature rise of air is not to exceed 10​ °F.

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Chapter 5 Solutions

The volumetric flow rate of air, in ft3/h, if the temperature rise of air is not to exceed 10 °F.