Conditioned air at 13°C and 90 percent relative humidity is to be mixed with outside air at 34°C and 40 percent relative humidity at 1 atm. If it is desired that the mixture has a relative humidity of 60 percent, determine (a) the ratio of the dry air mass flow rates of the conditioned air to the outside air, (b) the temperature of the mixture, and (c) check your results by the psychrometric chart. Note: do not use the psychrometric chart for calculation.

Conditioned air at 13°C and 90 percent relative humidity is to be mixed with outside air at 34°C and 40 percent relative humidity at 1 atm. If it is desired that the mixture has a relative humidity of 60 percent, determine (a) the ratio of the dry air mass flow rates of the conditioned air to the outside air, (b) the temperature of the mixture, and (c) check your results by the psychrometric chart. Note: do not use the psychrometric chart for calculation.

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

Conditioned air at 13°C and 90 percent relative humidity is to be mixed with outside air at 34°C
and 40 percent relative humidity at 1 atm. If it is desired that the mixture has a relative humidity
of 60 percent, determine (a) the ratio of the dry air mass flow rates of the conditioned air to the
outside air, (b) the temperature of the mixture, and (c) check your results by the psychrometric
chart. Note: do not use the psychrometric chart for calculation.

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Step 2: Calculating the partial pressure of the water vapor.

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Step 3: Calculating the ratio of the dry air mass flow rates

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Step 4: Calculating the temperature of the mixture.

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Step 5: Comparing with the psychrometric chart.

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