A cross-flow heat exchanger with air mixed and oil unmixed, (C = 2150 J/kg. °C), the mass flow rate ratio (m°/m°) leaves at 51°C, while oil enters @ 83°C, what is the effectiveness of the heat exchanger of the heat exchanger “%"? =1006 J/kg.°C, C. P oil P air 2.8, Air' ēnters at 25°C and air oil

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