QI: An air conditioning system is used to keep indoor condition of 24°C and 50% relative humidity inside a space as shown in Figure 1. An amount of 75% of returned air is mixed with 25% fresh ambient air at 40°C and 40% relative humidity before entering to the air filter. The air is cooled though the air cooling coil of surface effective temperature (apparatus dew point temperature) equals to 10°C and bypass factor is 0.2. Find the following: a. State of air after mixing (point m). b. State of air at coil outlet (point c). c. Sketch the process on the psychometric chart. d. Sensible heat factor of the space. space exhaust (25%) cooling coil filter fan m fresh air (25%) Figure 1

QI: An air conditioning system is used to keep indoor condition of 24°C and 50% relative humidity inside a space as shown in Figure 1. An amount of 75% of returned air is mixed with 25% fresh ambient air at 40°C and 40% relative humidity before entering to the air filter. The air is cooled though the air cooling coil of surface effective temperature (apparatus dew point temperature) equals to 10°C and bypass factor is 0.2. Find the following: a. State of air after mixing (point m). b. State of air at coil outlet (point c). c. Sketch the process on the psychometric chart. d. Sensible heat factor of the space. space exhaust (25%) cooling coil filter fan m fresh air (25%) Figure 1

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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Question

QI: An air conditioning system is used to keep indoor condition of 24°C and 50%
relative humidity inside a space as shown in Figure 1. An amount of 75% of returned
air is mixed with 25% fresh ambient air at 40°C and 40% relative humidity before
entering to the air filter. The air is cooled though the air cooling coil of surface
effective temperature (apparatus dew point temperature) equals to 10°C and bypass
factor is 0.2. Find the following:
a. State of air after mixing (point m).
b. State of air at coil outlet (point c).
c. Sketch the process on the psychometric chart.
d. Sensible heat factor of the space.
space
exhaust (25%)
cooling coil filter
fan
m
fresh air (25%)
Figure 1

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2. Air flowing at 2 kg / s has a dry ball temperature of 60 ° C and a wet bulb temperature of 30 ° C, mixed with another air stream flowing at 3 kg / s at 25 ° C and a relative humidity of 50%. Using a psychrometric chart determine the air flow properties of the mixture. (a) humidity ratio = (kg water / kg air). b. Enthalpy = (kJ / kg) c. Dry bulb temperature. = (° C)
D. Much of the humidity in the air comes from vaporization from large bodies of water, like the Schuylkill and Delaware Rivers. Assuming the area of Philadelphia is 3.6 x 108 m² and the height of the city is 297 m (top of Comcast center), calculate the energy needed to reach 100% humidity by vaporizing water from the rivers at the afternoon high temperature. (For the sake of this exercise, assume ideal gas applies) a. Having trouble? Review questions from Chapter 10: 51.
I need help to prepare to tomorrows exam. It needs to be shown on psychometric chart as well.
Dry air inlet temperature 23.9 (t1) Wet air inlet temperature 20.5 (t2) Dry air outlet temperature 24.3 (13) Wet air outlet temperature 23.1 (14) Inlet (A) Outlet (B) Set 2 Set 1 T [°C] Inlet (A) Outlet (B) (b) By using the psychrometric chart, fill up the table below for mass balance. Set 1 v[m/kg dry w[kg/kg dry air] Inlet (A) Outlet (B) 0.0183 0.017 [kg/kg dry air] 61 Set 2 T [°C] 68 24.2 20.8 25.4 24.5 aur] 0.86 v[m³/kg dry air m (c) By using the psychrometric chart, fill up the table below for energy balance. het [kJ/kg dry air] het [kJ/kg dry air [kg dry air/s] 0.0586 m [kg dry air/s] 6
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