Consider a mixing process as in Fig. P11.114 where flow 1 comes in as cold and moist, 10◦C, φ = 90%. It is mixed with a flow 2 at 42◦C, T = 31◦C. If the exit flow should be at 21◦C, φ = 50% find the ratio m˙ a₁/m˙ a₂ and the heat transfer per kg dry air out.

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1 3 4 ell FIGURE P11.114