HTRI air cooler calculation problem
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As shown in the figure, the horizontal, vertical (upward flow), and vertical (downward flow) options within the red box refer to the arrangement direction of the heat exchange tubes? Or the direction of air flow? Could someone expert help draw a simple diagram to illustrate these three situations? Thank you in advance
What’s the difference between vertical (upward) and vertical (downward)? Could you draw a simple diagram?