HW7P3 (15 pts) inters@buf A space in a building has a winter sensible heat loss of 180,000 kJ/h and a latent heat loss of Mben CDBT is to 60,000 kJ/h. The space is to be maintained precisely at 22C DBT and 50% RH. 50% by mass outdoor air at 0C DBT and 60% RH is required for ventilation. The amount of ventilation air is 100 cmm and the supply air is to be preheated, humidified with an adiabatic saturator to the desired humidity, and then reheated. The air temperature out of the adiabatic saturator is to be maintained at 15C dry bulb. Draw a schematic of the system, draw the cycle on the psychrometric chart, and determine the following: (a) The conditions of the air entering the space, (DBT & WBT). (b) The conditions of the air entering the preheat coil, (DBT & WBT). (c) The heat supplied to the preheat coil, kW (d) The heat supplied to the reheat coil, kW (e) The amount of makeup water required for dificationffalo.edu - Apr 12, 2023 - Shingama Apr 13, 2 PSYCHROMETRIC CHART NORMAL TEMPERATURES SI METRIC UNITS Barometric Pressure 101,325 kPa SEA LEVEL 85 90. johngama@buffalo.edu 10 15 20 25 ! 0 28 Wet Bulb or Saturation Temperature C 10 Enthalpy at saturation kJ/kg Dry Air 40 45 50 55 60 15 20 5- 5 0 -10 gama 0,75 Below 0C. Properties and Enthalpy Deviation Lines Are For Ice FOO 0,80 Dry Bulb Temperature C od 105 10 0,85 30 30 Volume m/kg dry air 20 120 8.0% 35 25 125 50% Relative Humidity ja 130 135 140 145 0,36 40 45 50 55 0,033 0,032 0,031 +0,030 0,40 0.029 0,028 0,027 0,45 0,026 0,025 0,024 0,023 0,50 0,022 0,021 0,55 0,020 0,019 0,60 0,018 0,017 DT 0,65 0,016 0,95 -0,70 0.015 0,014 0.75 0,013 -0,80 0,012 -0,85 0,011 0,90 1/20% 0,010 0,95 Sensible Heat Factor E 1.00 0,009 0,008 0,007 0,006 0,005 0,004 0,003 0,002 125 45 0,90 11:10 Moisture content kg/kg Dry Air 30%