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Outside air (100°F/75°F) flowing at 1000 cfm is mixed with return air (75°F/63°F) at 5000 cfm....
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...
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)
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. A room is to be maintained at 75 deg.F db. 3500 cfm of air is...
3. A room is to be maintained at 75 deg.F db. 3500 cfm of air is ventilated from this room. The sensible heat load on the room is 70,000 Btu/hr. From the air conditioning equation, what is the db temperature of the air ventilated from the room? The ventilated air is 30% rh. What is the wb temperature of the air ventilated from the room? What is the density of the ventilated air? What is the mass flow rate of...
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...
What is the dew point dp temperature of air at 5000 ft above sea level at...
What is the dew point dp temperature of air at 5000 ft above sea
level at 95 deg.F and 25% rh? Compare this with the dp of air at
sea level at the same conditions, explain the difference.
PSYCHROMETRIC CHART 5,000 Feet Barometric Pressure: 24.896 Inches of Mercury COOLERADO 75 65 SATU So -10 75 80 90 100 110 105 DRY BULB TEMPERATURE-F 115 120 ENTHALPY BTL RER ROUND OF DRY AIR dWHINS и ENTHALPY т7 BTU PER POUND OF...
A motel in Miami, Florida has a sensible cooling load of 75 tons and a sensible...
A motel in Miami, Florida has a sensible cooling load of 75 tons and a sensible heat ratio on the building of 0.85. Each of the motel's 100 rooms must be supplied with 30 cfm of outside air to satisfy the local ventilation codes. If the rooms are kept at 75F and 50% R.H., determine: a.) sketch of the system b.) Air flow to the building in cfm (fan size) c.) The mixed air condition-temperature and humidity d.) The cooling...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the following outdoor and comfort conditions a) Outdoor design conditions = 35 °C, db and 65% R.H b) Indoor/return design conditions-26 deg C. db and 55% RH. c) Total sensible room load = 420,000 kJ/hr d) Total latent room load = 200,000 KJ/hr e) The rise in dry bulb temperature of the air inside the conference center is limited to 9 °C (i.e. the Supply...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow rate is 1,000 cfm, the humidity ratio is 0.025 lbv/lba, and the dry air density is 0.072 Iba/ft3. b. Assume the above air enters an evaporator coil at 90°F where it is cooled in a constant humidity ratio process until reaching the 100 % RH curve ( the temperature at that point is the dew point. The air then keeps dropping in temperature, following...
56. Fresh air is introduced into a room at such a rate that the air in...
56. Fresh air is introduced into a room at such a rate that the air in the room is changed every 5 minutes. The room is 30 by 30 by 10 ft and the air in the room is at 70 °F with a percentage humidity of 60. Outside air at a temperature of 60 °F is used as air supply. The outside air is heated to the room temperature by a heat exchanger. How many BtU per hour must...
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...
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. A room is to be maintained at 75 deg.F db. 3500 cfm of air is ventilated from this room. The sensible heat load on the room is 70,000 Btu/hr. From the air conditioning equation, what is the db temperature of the air ventilated from the room? The ventilated air is 30% rh. What is the wb temperature of the air ventilated from the room? What is the density of the ventilated air? What is the mass flow rate of...
What is the dew point dp temperature of air at 5000 ft above sea
level at 95 deg.F and 25% rh? Compare this with the dp of air at
sea level at the same conditions, explain the difference.
PSYCHROMETRIC CHART 5,000 Feet Barometric Pressure: 24.896 Inches of Mercury COOLERADO 75 65 SATU So -10 75 80 90 100 110 105 DRY BULB TEMPERATURE-F 115 120 ENTHALPY BTL RER ROUND OF DRY AIR dWHINS и ENTHALPY т7 BTU PER POUND OF...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the following outdoor and comfort conditions a) Outdoor design conditions = 35 °C, db and 65% R.H b) Indoor/return design conditions-26 deg C. db and 55% RH. c) Total sensible room load = 420,000 kJ/hr d) Total latent room load = 200,000 KJ/hr e) The rise in dry bulb temperature of the air inside the conference center is limited to 9 °C (i.e. the Supply...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow rate is 1,000 cfm, the humidity ratio is 0.025 lbv/lba, and the dry air density is 0.072 Iba/ft3. b. Assume the above air enters an evaporator coil at 90°F where it is cooled in a constant humidity ratio process until reaching the 100 % RH curve ( the temperature at that point is the dew point. The air then keeps dropping in temperature, following...
56. Fresh air is introduced into a room at such a rate that the air in the room is changed every 5 minutes. The room is 30 by 30 by 10 ft and the air in the room is at 70 °F with a percentage humidity of 60. Outside air at a temperature of 60 °F is used as air supply. The outside air is heated to the room temperature by a heat exchanger. How many BtU per hour must...
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