A room is conditioned to 75°F and 50% relative humidity. A fan system combines 5000 ft³/min of recirculated air from the room with 2500 ft³/min of outdoor air at 90°F dry-bulb temperature and 75°F wet-bulb temperature. The mixed air enters through a chilled-water cooling coil as shown. to room cooling coil mixed air outside air fan recirculated air exhaust air return air from room The enthalpy of the air entering the cooling coil is most nearly Hint: The psychrometric properties of the mixed air are a weighted interpolation of the outside air and recirculated air volume flows. (A) 28 Btu/lbm (B) 32 Btu/lbm (C) 35 Btu/lbm (D) 39 Btu/lbm
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Adi S.
Outdoor air at 35°C dry bulb and 24°C wet bulb temperatures is to be mixed with room air at 26°C dry bulb and 50 percent relative humidity. The final mixture is to consist of one-third outdoor air and two-thirds return air from the room. The Sensible Heat Factor (SHF) of the room is known to be 0.8. If the supplied air is to be kept at 15°C with a reheater coil, determine: 1. Mixed air condition 2. Apparatus dew point temperature 3. Supply air condition 4. Cooling coil and reheater loads Show the process on a psychrometric chart with labels. If the latent heat transfer is increased and it is equal to the sensible heat transfer, i.e. Qs = Ql, comment on the sizing required by the reheater coil and cooling coil. You may use a sketch to support your answer.
An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and a humidifier that supplies wet steam (saturated water vapor) at $100^{\circ} \mathrm{C}$ Air enters the heating section at $10^{\circ} \mathrm{C}$ and 70 percent relative humidity at a rate of $35 \mathrm{~m}^{3} / \mathrm{min},$ and it leaves the humidifying section at $20^{\circ} \mathrm{C}$ and 60 percent relative humidity. Determine ( $a$ ) the temperature and relative humidity of air when it leaves the heating section, $(b)$ the rate of heat transfer in the heating section, and $(c)$ the rate at which water is added to the air in the humidifying section.
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