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Homework Answers
An air handling unit AHU moves 3000 cubic feet/minute (cfm) of return air at 85 deg.F db/77 deg.F wb. Part of this air,...
An air handling unit AHU moves 3000 cubic feet/minute (cfm) of return air at 85 deg.F db/77 deg.F wb. Part of this air, 1000 cfm, bypasses a cooling coil that cools air to 54 deg.F, saturated. What is the db temperature of the mixed air streams? Use the chart to find the wb temperature. (Answer: 64 deg.F db, 63 deg.F wb)
Outside air (100°F/75°F) flowing at 1000 cfm is mixed with return air (75°F/63°F) at 5000 cfm....
Outside air (100°F/75°F) flowing at 1000 cfm is mixed with return air (75°F/63°F) at 5000 cfm. Find the mixed air conditions (db, RH, wb, u, and h). Sketch on the psychrometric chart.
A manufacturing building is being ventilated to maintain air temperature, air moisture levels and air quality....
A manufacturing building is being ventilated to maintain air temperature, air moisture levels and air quality. The following is known about the situation: • The desired inside conditions are 68°F db with a maximum of 60% RH. • The average outside conditions are 42°F db and 35°F wb. • The building has an overall heat loss factor of 454 BTU/(h·ºF) with a total volume of 76,000 ft3. • Inside the building, people and equipment generate sensible heat at a rate...
Exhaust Air Heat Wheel Return Air HRU Outlet Ventilation Air Wheel Type Total HRU .8 Two...
Exhaust Air Heat Wheel Return Air HRU Outlet Ventilation Air Wheel Type Total HRU .8 Two types of heat recovery units. CHAPTER 4 PROBLEMS 4.1 A sling psychrometer measures the air tempera- tures to be 85°F dry bulb and 72°F wet bulb. Find: relative humidity, dew-point temperature, humidity ratio (in lbmv/lbma and grains), specific volume, and enthalpy. Show results on a chart and verify with the program PsychProcess.xls (on the accom- panying CD). Assume sea level elevation. 4.2 Air flowing...
A room is to be air conditioned in the summer using water-cooled coils. The return air to air cooling unit has a sensibl...
A room is to be air conditioned in the summer using water-cooled coils. The return air to air cooling unit has a sensible heat load of 100,000 Btu/hr and a latent heat load of 40,000 Btu/hr. The total heat load of the air going to the outside is 80,000 Btu/hr. Water enters the cooling coil at 40 deg.F and exits at 52 deg.F. From the total heat load on the room, use the result for water flow found above in...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (we...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (wet bulb) has a rate of sensible-heat gain of 25 kWand a rate of moisture gain of20 kg/hr. Moist air enters the space at a dry-bulb temperature of 15°C. Outdoor air at 35 C dB temperature and 25 C wB is supplied for ventilation purposes at a rate of 400 Us (litres per second) of standard air. After leaving the room,...
An office building requires the following cooling load: RSCL = 480,000 BTU/hr RLCL 250,000 BTU/Hr Outdoor...
An office building requires the following cooling load: RSCL = 480,000 BTU/hr RLCL 250,000 BTU/Hr Outdoor design condition: 100 F DB and 78 F WB Room Design Condition: 70 F DB, 50 % RH Required Outside Air: 1,800 CFM Supply Air Temperature Difference 30°F (Difference between the room temperature and the supply air temperature) Which one of the following represents the Dry Bulb'temperature of the Supply Air? 40 °F 78 OF 100 °F None of the above
An office building...
Psychrometrics) - Work on Your Own Tlowing at 1500 cfm is heated from 65°F (RH-35 conditions...
Psychrometrics) - Work on Your Own Tlowing at 1500 cfm is heated from 65°F (RH-35 conditions (db. RH ons (db, RH, wb, m) Sketch the process on the psychometri 65°F (RH-3596) at a rate of 50.000 Btu/h. Find the outlet air AMERICAN SOCIETY OF HEATING P RICERATO AND AR-CONDITIONING ENGINEERSING w ENTHALPY,
3. Room-1 is at 20°C DB and 80% RH. Room-2 is at 25°C DB and 40%...
3. Room-1 is at 20°C DB and 80% RH. Room-2 is at 25°C DB and 40% RH. Which room has the higher heat content? Use ASHRAE psychrometric chart. 4. A room is at 35°C DB and 50% RH. An air-conditioning unit starts to cool the air. At what temp will the moisture in the air start to condense? What are the initial and final enthalpies and humidity ratios?
explain please 3. 0.5 m3/s of return air from the room at 24°C DB temperature and...
explain please
3. 0.5 m3/s of return air from the room at 24°C DB temperature and 20°C WB temperatures is mixed with 0.60 m3/s of outside air at 35°C DB temperature and 60% RH. Determine: i. The humidity ratio of the mixture, W3 = a. 16.74 gw/kg da b. 17.56 gw/kg da C. 15.45 g/kg da d. 14.80 gw/kg da ii. The DB temperature of the mixture, DBT3 = a. 28.8 °C b. 27.1°C C. 30.2°C d. 26.5 °C
Outside air (100°F/75°F) flowing at 1000 cfm is mixed with return air (75°F/63°F) at 5000 cfm. Find the mixed air conditions (db, RH, wb, u, and h). Sketch on the psychrometric chart.
Exhaust Air Heat Wheel Return Air HRU Outlet Ventilation Air Wheel Type Total HRU .8 Two types of heat recovery units. CHAPTER 4 PROBLEMS 4.1 A sling psychrometer measures the air tempera- tures to be 85°F dry bulb and 72°F wet bulb. Find: relative humidity, dew-point temperature, humidity ratio (in lbmv/lbma and grains), specific volume, and enthalpy. Show results on a chart and verify with the program PsychProcess.xls (on the accom- panying CD). Assume sea level elevation. 4.2 Air flowing...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (wet bulb) has a rate of sensible-heat gain of 25 kWand a rate of moisture gain of20 kg/hr. Moist air enters the space at a dry-bulb temperature of 15°C. Outdoor air at 35 C dB temperature and 25 C wB is supplied for ventilation purposes at a rate of 400 Us (litres per second) of standard air. After leaving the room,...
An office building requires the following cooling load: RSCL = 480,000 BTU/hr RLCL 250,000 BTU/Hr Outdoor design condition: 100 F DB and 78 F WB Room Design Condition: 70 F DB, 50 % RH Required Outside Air: 1,800 CFM Supply Air Temperature Difference 30°F (Difference between the room temperature and the supply air temperature) Which one of the following represents the Dry Bulb'temperature of the Supply Air? 40 °F 78 OF 100 °F None of the above
An office building...
Psychrometrics) - Work on Your Own Tlowing at 1500 cfm is heated from 65°F (RH-35 conditions (db. RH ons (db, RH, wb, m) Sketch the process on the psychometri 65°F (RH-3596) at a rate of 50.000 Btu/h. Find the outlet air AMERICAN SOCIETY OF HEATING P RICERATO AND AR-CONDITIONING ENGINEERSING w ENTHALPY,
3. Room-1 is at 20°C DB and 80% RH. Room-2 is at 25°C DB and 40% RH. Which room has the higher heat content? Use ASHRAE psychrometric chart. 4. A room is at 35°C DB and 50% RH. An air-conditioning unit starts to cool the air. At what temp will the moisture in the air start to condense? What are the initial and final enthalpies and humidity ratios?
explain please
3. 0.5 m3/s of return air from the room at 24°C DB temperature and 20°C WB temperatures is mixed with 0.60 m3/s of outside air at 35°C DB temperature and 60% RH. Determine: i. The humidity ratio of the mixture, W3 = a. 16.74 gw/kg da b. 17.56 gw/kg da C. 15.45 g/kg da d. 14.80 gw/kg da ii. The DB temperature of the mixture, DBT3 = a. 28.8 °C b. 27.1°C C. 30.2°C d. 26.5 °C
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