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Problem $04\mathrm{.}052-$ Flow Ratios of Two Streams in a Counterflow Heat Exchanger

Saturated steam at $1$ atm and $100C$ is continuously generated from liquid water at $1$ atm and $25C$ by thermal contact with

hot air in a counterflow heat exchanger. The air flows steadily at $1$ atm. Determine values for $m^{}($steam$)/n^{}($air$)$ for the

following cases.

Problem $04\mathrm{.}052.$b $-$ Flow Ratios of Two Streams in a Counterflow Heat Exchanger $($Air Inlet at $500$C$)$

Consider that air enters the exchanger at $500C$ and exits at $35C.$

References

The value for $m^{}($steam$)n^{}($air$)$ is