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22. An electrical room contains a 15KVA transformer. What is the exhaust ventilation air in cfm...
Example Assume a classroom space is designed for an occupancy of 30 persons. The ASHRAE Standard calls for a minimum outside airflow rate for classrooms of 15 cfm per person. What is the total ven...
Example Assume a classroom space is designed for an occupancy of 30 persons. The ASHRAE Standard calls for a minimum outside airflow rate for classrooms of 15 cfm per person. What is the total ventilation air quantities? ARC 263 Mechanical, Electrical, Plumbing and Energy Systems Example Estimate infiltration and ventilation air quantities for a 10,000 sf classroom building built in 1954. The conditioned space is 12 ft high, and the total population is 320 students (ages 5-8) Estimate 1.5 ACH...
QUESTION 1 A rooftop unit exhausts return air from the space to outdoors exhaust? Assume the COP ...
QUESTION 1 A rooftop unit exhausts return air from the space to outdoors exhaust? Assume the COP for the unit is 3.0 and that electricity costs are $0.10/kWh. Properties of air: density o and replaces it with 7,364 CFM of fresh air. THe exhausted air is at 77F and the fresh 89F. If ths unit is cooling for 2,579 hours each year, what annual savings, in dollars, is possible by cooling the fresh 0743 ib/t3, cp 0.24 Btu/1bm-F
QUESTION 1...
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...
What is the volumetric flow rate for a 15” duct with a velocity pressure of 22” H2O? 1940 cfm&n...
What is the volumetric flow rate for a 15” duct with a velocity pressure of 22” H2O? 1940 cfm 5249 fpm 4305 cfm 5428 cfm What is the capture velocity at a point that is located 18 inches away from, and directly in front of, the opening of a rectangular flanged hood with dimensions of 2 inches wide by 12 inches long when the air flow servicing the hood is 585 cfm. 34 fpm 145 fpm 150 fpm 160 fpm...
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...
Please explain (1 point) The air in poultry-processing plants often contains fungus spores. Inadequate ventilation can...
Please
explain
(1 point) The air in poultry-processing plants often contains fungus spores. Inadequate ventilation can affect the health of the workers. The problem is most serious during the summer. To measure the presence of spores, air samples are pumped to an agar plate and "colony-forming units (CFUs)" are counted after an incubation period. Here are data from two locations in a plant that processes 37,000 turkeys per day, taken on four days in the summer. The units are CFUs...
a) [15 marks] Write the differential equations that describe the behavior of the electrical system shown...
a) [15 marks] Write the differential equations that describe the behavior of the electrical system shown in Figure 1. Assume that all electrical components behave linearly. Note that v(t) is an external input voltage signal, and vi(t) is the output voltage signal, respectively. 0000 1H 1Ω 1Ω M v(t) Figure 1. Electrical network for question 1. Use the currents ij, iz, and iz which flow through the inductors next to the red, green, and blue arrows, respectively, as the key...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures 3 m wide high and 6 m deep One of the two 3 m walls faces west and contains a do window of sıze 1 5 m by 1 5 m, mounted flush with the wall with no external s shading T the follo are no heat gains through the walls other than the one facing east From nformation Inside conditions 25 °C dry...
4. Commercial building energy analysis. This problem analyzes how large commercial buildings use using data from...
4. Commercial building energy analysis. This problem analyzes how large commercial buildings use using data from the Photonics Center In particular, we want to compare the energy needed to condition the air flowing through the building, with the energy needed to 1) provide heat in the winter to balance the heat loss from the walls to the environment, and 2) provide the necessary cooling in the summer time to overcome the heat gain from the outside air (lets ignore solar...
Problem2 (a) Suppose outside temperature is 55 °F while the temperature inside a building is 72 F. The building is heated but not air conditioned, so the partial pressure of water vapor is the sa...
Problem2 (a) Suppose outside temperature is 55 °F while the temperature inside a building is 72 F. The building is heated but not air conditioned, so the partial pressure of water vapor is the same both inside and outside the building. Finally, suppose the dew point outside is 40°F What is the dew point inside? What are the relative humidities inside and outside the building? (We are most comfortable if relative humidity is between 30% and 50%-This question shows why...
Example Assume a classroom space is designed for an occupancy of 30 persons. The ASHRAE Standard calls for a minimum outside airflow rate for classrooms of 15 cfm per person. What is the total ventilation air quantities? ARC 263 Mechanical, Electrical, Plumbing and Energy Systems Example Estimate infiltration and ventilation air quantities for a 10,000 sf classroom building built in 1954. The conditioned space is 12 ft high, and the total population is 320 students (ages 5-8) Estimate 1.5 ACH...
QUESTION 1 A rooftop unit exhausts return air from the space to outdoors exhaust? Assume the COP for the unit is 3.0 and that electricity costs are $0.10/kWh. Properties of air: density o and replaces it with 7,364 CFM of fresh air. THe exhausted air is at 77F and the fresh 89F. If ths unit is cooling for 2,579 hours each year, what annual savings, in dollars, is possible by cooling the fresh 0743 ib/t3, cp 0.24 Btu/1bm-F
QUESTION 1...
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...
Please
explain
(1 point) The air in poultry-processing plants often contains fungus spores. Inadequate ventilation can affect the health of the workers. The problem is most serious during the summer. To measure the presence of spores, air samples are pumped to an agar plate and "colony-forming units (CFUs)" are counted after an incubation period. Here are data from two locations in a plant that processes 37,000 turkeys per day, taken on four days in the summer. The units are CFUs...
a) [15 marks] Write the differential equations that describe the behavior of the electrical system shown in Figure 1. Assume that all electrical components behave linearly. Note that v(t) is an external input voltage signal, and vi(t) is the output voltage signal, respectively. 0000 1H 1Ω 1Ω M v(t) Figure 1. Electrical network for question 1. Use the currents ij, iz, and iz which flow through the inductors next to the red, green, and blue arrows, respectively, as the key...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures 3 m wide high and 6 m deep One of the two 3 m walls faces west and contains a do window of sıze 1 5 m by 1 5 m, mounted flush with the wall with no external s shading T the follo are no heat gains through the walls other than the one facing east From nformation Inside conditions 25 °C dry...
4. Commercial building energy analysis. This problem analyzes how large commercial buildings use using data from the Photonics Center In particular, we want to compare the energy needed to condition the air flowing through the building, with the energy needed to 1) provide heat in the winter to balance the heat loss from the walls to the environment, and 2) provide the necessary cooling in the summer time to overcome the heat gain from the outside air (lets ignore solar...
Problem2 (a) Suppose outside temperature is 55 °F while the temperature inside a building is 72 F. The building is heated but not air conditioned, so the partial pressure of water vapor is the same both inside and outside the building. Finally, suppose the dew point outside is 40°F What is the dew point inside? What are the relative humidities inside and outside the building? (We are most comfortable if relative humidity is between 30% and 50%-This question shows why...
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