In a food processing industry, hot water and cold water are mixed in a mixing chamber to produce a continuous supply of warm water. Hot water with a specific enthalpy of 420 kJ/kg and cold water with a specific enthalpy of 105 kJ/kg are mixed in the mixing chamber to produce 3.5 kg/s of warm water with a specific enthalpy of 293 kJ/kg. Assuming no heat is lost to its surroundings and the change in potential energy and kinetic energy are negligible. Determine: (a) mass flow rate of hot water; and (b) mass flow rate of cold water.

In a food processing industry, hot water and cold water are mixed in a mixing chamber to produce a continuous supply of warm water. Hot water with a specific enthalpy of 420 kJ/kg and cold water with a specific enthalpy of 105 kJ/kg are mixed in the mixing chamber to produce 3.5 kg/s of warm water with a specific enthalpy of 293 kJ/kg. Assuming no heat is lost to its surroundings and the change in potential energy and kinetic energy are negligible. Determine: (a) mass flow rate of hot water; and (b) mass flow rate of cold water.

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

In a food processing industry, hot water and cold water are mixed in a mixing
chamber to produce a continuous supply of warm water. Hot water with a specific
enthalpy of 420 kJ/kg and cold water with a specific enthalpy of 105 kJ/kg are mixed
in the mixing chamber to produce 3.5 kg/s of warm water with a specific enthalpy of
293 kJ/kg. Assuming no heat is lost to its surroundings and the change in potential
energy and kinetic energy are negligible. Determine:
(a)
mass flow rate of hot water; and
(b)
mass flow rate of cold water.

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