Two moist air streams with 85 % relative humidity, both...

Two moist air streams with $85 \%$ relative humidity, both flowing at a rate of $0.2 \mathrm{lbm} / \mathrm{s}$ of dry air, are mixed in a steady-flow setup. One inlet flowstream is at $90 \mathrm{~F}$ and the other is at $61 \mathrm{~F}$. Find
the exit relative humidity.

Key Concepts

Mixing of Air Streams

Mixing of air streams involves combining two or more separate flows of air, each with its own humidity and temperature characteristics, to form a single outlet stream. The analysis of such processes typically employs mass balance principles, particularly on a dry-air basis, as well as energy balance considerations to determine the resulting mixture properties including temperature, humidity ratio, and relative humidity.

Steady-Flow Process

A steady-flow process is one in which the properties of the system, such as mass flow rates and energy contents, remain constant over time. This assumption simplifies the analysis because it means that the conditions at the inlets and outlets are time-invariant, allowing for the direct application of conservation laws without considering transient effects.

Relative Humidity

Relative humidity is a measure that compares the current amount of water vapor in the air to the maximum amount of water vapor that the air can hold at a given temperature. It is expressed as a percentage and is fundamental in determining how 'humid' or 'dry' the air feels, influencing comfort levels and condensation phenomena.

Psychrometrics

Psychrometrics is the branch of engineering that deals with the thermodynamic properties of moist air and the relationships among temperature, humidity, and energy. It involves the study of parameters such as temperature, moisture content, and energy content, often using tools like the psychrometric chart to analyze air-conditioning and heating processes.

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