Q) Air conditioning system supplies two rooms required deferent conditions. Room 1 is to be minted at 16 C° dry bu temperature and 75% saturation, by supplying air at 13 C°, whereas room 2 is to be minted at 25 C° and 45% saturation supplying air at the same moisture content as required for room one. There is a commune extract duct the ratio of fre outdoor air to rooms recirculated air be (0.2). Then the mixed air stream passes through a cooled coil which has a cont factor 0.9, then supplying to the rooms through separates heater coil. Determine: a- The mass flow rate of supplying air 1 each room. b- Plot the psychometric chart. c- Obtain the cooler load. d- Obtain the load of each heater. Let the outdc condition is 42 C° dry bulb temperature & 25 % RH. [Room 1 (Qs=5.2 kW, Q=1.3 kW) Room 2 (Qs=4.2 kW, QL-2.8 kW

Three types of fluids stack in an open tank as shown in the plot.  Select the expression of the gage pressure at location 1, P1(gage)=______       A. Patm   B. 0   C. 101.325 kPa   D. It can not be determined.

Atmospheric air is conditioned using an air conditioning before is supplied to a room. The following conditions were measured for dry air flow rate of 1 kg/s: Room air (outlet condition): • Relative Humidity (RH): 55.0 % • Dew point temperature: 10.7 °C Supply air (inlet condition): • Dry-bulb Temperature: 31.0 °C • Wet-Bulb Temperature: 22.6 °C 1. State all assumptions and include reference(s). 2. Estimate the inlet conditions (Relative humidity, dew point temperature, enthalpy, specific volume) based on the psychrometric chart 3. Estimate the outlet conditions (Dry-bulb Temperature, wet-bulb temperature, humidity ratio, specific volume) based on the psychrometric chart. 4. How much water in g/s was removed/added? Note: you must indicate if water was removed or added. 5. How much total heat or energy in kW was removed/added? Note: you must indicate if heat was removed or added. 6. What is sensible heat in kW for these conditions?

Q.2 The following data relates to the office air conditioning plant having maximum seating capacity of 25 occupants : Recirculated air Room Outside air 4) to = 34°C tm = 28°C ta2 = 24°C $2 = 50% Mixing Coil Outside design conditions: 34°C DBT, 28°C WBT Inside design conditions: 24°C DBT, 50% RH Solar heat gain= 9120 W Latent heat gain per occupant= 105w Sensible heat gain per occupant=90w Lightening load= 2300 W Sensible heat load from other sources= 11630 W Infiltration load= 14 m³/min Assuming 40% fresh air and 60% of recirculated air passing through the evaporator coil and the by-pass factor of 0.15. Draw the process on psychrometric chart and find the dew point temperature of the coil and capacity of the plant.

Question 2 A refrigeration cycle operates with R-134a. State 1 State 2 TA 15 psia 180 psia Saturated liquid 0 °F 200 °F QH If QL flow rate m, the work in Win, the compressor efficiency 7., and the volumetric flow rate V. 144,000 Btu/hr, find the COP, the mass %3D Win m = %3D 4° 4. Saturated vapor Win =