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GATE ME 2020 Set 2 — Question 63

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NAT+2 / -0HardHumidification & DehumidificationRefrigeration & Air ConditioningThermodynamics

Thermodynamics → Refrigeration & Air Conditioning → Humidification & Dehumidification

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Question

Moist air at 105 kPa105\text{ kPa}, 30∘C30^\circ\text{C} and 80%80\% relative humidity flows over a cooling coil in an insulated air-conditioning duct. Saturated air exits the duct at 100 kPa100\text{ kPa} and 15∘C15^\circ\text{C}. The saturation pressures of water at 30∘C30^\circ\text{C} and 15∘C15^\circ\text{C} are 4.24 kPa4.24\text{ kPa} and 1.7 kPa1.7\text{ kPa} respectively. Molecular weight of water is 18 g/mol18\text{ g/mol} and that of air is 28.94 g/mol28.94\text{ g/mol}. The mass of water condensing out from the duct is _______ g/kg of dry air (round off to the nearest integer).
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