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An office building requires the following cooling load: RSCL = 480,000 BTU/hr RLCL 250,000 BTU/Hr Outdoor...
Q.5 A building space is maintained at 76°F db and 50% r.h. The peak cooling load...
Q.5 A building space is maintained at 76°F db and 50% r.h. The peak cooling load is 10 tons with a SHR of 0.75. Ventilation of 1000 cfm is required of outside air at 95°F db and 55% r.h. Determine the CFM, the humidity ratio of supply air and the required capacity of the cooling equipment
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 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...
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 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...
Set up a table showing the individual load components and calculate the total load in Btu/hr-ft2...
Set up a table showing the individual load components and calculate the total load in Btu/hr-ft2 Consider an office building of 7,680 ft2 floor area and 76,800 ft3 volume in Phoenix, AZ. The outdoor temperature is 110 0F. The room is kept at 720 F and the solar heat gain thru the window is 85,000 Btu/hr. The gross areas and the overall U values of each element are given below: - wall: 3440 ft2 and 0.30 Btu/hr-ft2- 0F - window:...
3. Compute the cooling load for the south windows of an office building that has no external shad...
3. Compute the cooling load for the south windows of an office building that has no external shading. The window is regular insulating glass with 1/2 inch air space and Wood/Vinyl frame. Drapes with reflectance of 0.2 and transmittance of 0.5 are fully closed. The total window area is 400ft2. Assume the indoor temperature is 78 F and the outdoor temperature are 100'F in July and 40'F in December, with a 22 F daily range. Make the calculation for 12:00...
An evaporative cooling tower removes 1 x 106 Btu/hr of heat from the cooling water from...
An evaporative cooling tower removes 1 x 106 Btu/hr of heat from the cooling water from a condenser of a steam power plant. The temperature of the water is reduced from 120 °F to 110 °F. Air enters the cooling tower at 91 °F and 60% relative humidity and air leaves at 100 °F and 82% relative humidity. The quantity of make-up water is:
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,...
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...
Q.5 A building space is maintained at 76°F db and 50% r.h. The peak cooling load is 10 tons with a SHR of 0.75. Ventilation of 1000 cfm is required of outside air at 95°F db and 55% r.h. Determine the CFM, the humidity ratio of supply air and the required capacity of the cooling equipment
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 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...
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...
3. Compute the cooling load for the south windows of an office building that has no external shading. The window is regular insulating glass with 1/2 inch air space and Wood/Vinyl frame. Drapes with reflectance of 0.2 and transmittance of 0.5 are fully closed. The total window area is 400ft2. Assume the indoor temperature is 78 F and the outdoor temperature are 100'F in July and 40'F in December, with a 22 F daily range. Make the calculation for 12:00...
An evaporative cooling tower removes 1 x 106 Btu/hr of heat from the cooling water from a condenser of a steam power plant. The temperature of the water is reduced from 120 °F to 110 °F. Air enters the cooling tower at 91 °F and 60% relative humidity and air leaves at 100 °F and 82% relative humidity. The quantity of make-up water is:
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,...
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