2.5 m3/s of humid air at a state of 28°C DB, 21°C WB and 101.325 kPaa flow across a cooler coil and leaves ar 12.5°C DB and 0.0083 kg vapor per kg dry air. If the apparatus dew point temperature (ADP) is 8.5, compute for the contact factor

2.5 m3/s of humid air at a state of 28°C DB, 21°C WB and 101.325 kPaa flow across a cooler coil and leaves ar 12.5°C DB and 0.0083 kg vapor per kg dry air. If the apparatus dew point temperature (ADP) is 8.5, compute for the contact factor

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Air flowing at the rate of 80m° /min at 35°C dry bulb temperature and 50% relative humidity is mixed with another stream flowing at the rate of 20m°/min at 21°C dry bulb temperature and 50% relative humidity. The mixture flows over a cooling coil whose apparatus dew point temperature is 5°C and by-pass factor is 0.2. Find dry bulb temperature and relative humidity of air leaving the coil. If this air is supplied to an airconditioned room where dry bulb temperature of 21°C and relative humidity of 50% are maintained, and determine: a) Room sensible heat factor; and b) Cooling load capacity of the coil in tons of refrigeration.
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Given that Initial Temperature = 28.5 deg C, Dew Point = 9 deg C, Dry Bulb = 30 deg C, Wet Bulb = 28 deg C, Saturation Pressure = 1.148 kPa Calculate the following: Humidity Ratio w = 0.622PsPt-Ps=0.622PsPa kg water/kg air Partial pressure of water vapour where: Ps = partial pressure of water vapour (Psat at dewpoint temperature ) w = humidity ratio Pt = total pressure (standard atmospheric pressure) Pt = Pa + Ps Pa = partial pressure of dry air = Pt - Ps 3. Relative Humidity RH = PsPd 4. v = RaTPa m3/kg 5. ω = 1vkg/m3 where: Pd = saturation pressure at room temperature (from steam table) ω = density of air v = specific volume of dry air T = absolute temperature of room temperature Ra = gas constant of air =0.28706 kJ/kg-K
An auditorium to be air-conditioned for the following conditions, Outdoor dry-bulb temperature 40 °C Outdoor wet-bulb temperature 20°C Expected comfort condition 20 DBT 60%RH Seating capacity of the auditorium 1500 persons Air supplied from outdoor 0.3 m¥min per person fthe required condition is achieved first by adiabatic humidification and then by cooling, determine () the capacity of the cooling coil in tonnes and (i) the capacity of humidifier in kg/h.
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