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(6) What are the conversions for the following? a. HP to BTU/hr b. in? to ft?...
Air is flowing at.1 lbf/sec at an elevation of 50 ft and a velocity of 50 ft/sec. What is the total potential and kinetic energy in Btu/hr? zero 300 Btu/hr 41 Btu/hr 1202 Btu/hr Air is flowing a...
Air is flowing at.1 lbf/sec at an elevation of 50 ft and a velocity of 50 ft/sec. What is the total potential and kinetic energy in Btu/hr? zero 300 Btu/hr 41 Btu/hr 1202 Btu/hr
Air is flowing at.1 lbf/sec at an elevation of 50 ft and a velocity of 50 ft/sec. What is the total potential and kinetic energy in Btu/hr? zero 300 Btu/hr 41 Btu/hr 1202 Btu/hr
A 100 ft2 wall consists of 4 in of red brick (k = 0.38 Btu-ft/hr-ft-°F), 1...
A 100 ft2 wall consists of 4 in of red brick (k = 0.38 Btu-ft/hr-ft-°F), 1 inch of pine (k = 0.06 Btu-ft/hr- ft-°F) and 42 inch of plaster board (k = 0.30 Btu-ft/hr-ft-°F). The internal and external film heat transfer coefficients are 1.65 Btu/hr-ft-°F and 6.00 Btu/hr-ft-'F respectively. The inside and outside air temperatures are 72 °F and 30 °F respectively. The heat transfer rate is:
2. Verify the conversion factors (a) 1 Btu/ft2-hr 3.1525 W/m2 (b) 1 Btu/hr -0.292 875 W...
2. Verify the conversion factors (a) 1 Btu/ft2-hr 3.1525 W/m2 (b) 1 Btu/hr -0.292 875 W (c) 1 Btu/hr ft. F -1.729 W/m-K ot 16t 105935
A wall is constructed of two layers of sheetrock (k = 0.10 Btu/hr-ft-F°) separated by 12...
A wall is constructed of two layers of sheetrock (k = 0.10 Btu/hr-ft-F°) separated by 12 inches of fiberglass insulation (k = 0.020 Btu/hr-ft-F°). The two layers of sheetrock are 3/4 of an inch thick so the wall is sheetrock, insulation then sheetrock. What is the thermal resistance of this construction (there are no studs!) in units of hr-F°/Btu to three significant digits?
Mechanical Engineering Thermodynamics, ME 200 5- Workshop - Open system first law with Air as an...
Mechanical Engineering Thermodynamics, ME 200 5- Workshop - Open system first law with Air as an ideal gas Pre-work (1) Write the ideal gas law? (2) What is the value of the universal gas constant in english units (both units: 2 .and... .) (3) What is the ideal gas constant for air (both sets of units)? (4) Write conservation of energy (first law) for an open system (control volume): (5) Write down the options of how to find the value...
1.17 A thin, 0.5 inch diameter copper (k = 220 Btu / hr-ft-F) rod spans the...
1.17 A thin, 0.5 inch diameter copper (k = 220 Btu / hr-ft-F) rod spans the distance between two parallel plates 6 inches apart. Air flows in the space between the plates, providing a heat transfer coefficient of 40 Btu / hr-ft2-F at the surface of the rod. The surface temperature of the plates exceeds that of the air by 100 F. By how much does the temperature at the midpoint of the rod exceed the temperature of the air...
A building has a design heating load of 63,000 BTU/hr. A series loop hydronic heating system...
A building has a design heating load of 63,000 BTU/hr. A series loop hydronic heating system will be used. A 2-in type M copper tubing will be selected for baseboard. Supply temperature (temperature of water leaving the boler) is 220° F and an overall system temperature drop of 300 F is permitted. Determine: a. Water temperature at exit of Unit #1(OF), b. Water temperature at the entrance of unit # 5 (OF) c. Flow rate in Unit # 5 (GPM),...
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...
You are building a new house, you can buy cheap ceiling insulation (R =11 ft2-°F-hr/Btu) or...
You are building a new house, you can buy cheap ceiling insulation (R =11 ft2-°F-hr/Btu) or more expensive insulation (R=25 ft2-°F-hr/Btu). If the winter outside average temperature is 45°F for 4 months in HSV, and 3 months of summer (85°F). Assume that you keep the house at 70°F. • What is difference in electricity costs if electricity cost are 8 cents/kW hr? (Ahouse = 40 x30 ft) • If the difference in cost is $1,200 at time of installation, what...
A 2 ft high x 6 ft wide double-glazed window faces southwest. The window has a frame with width o...
A 2 ft high x 6 ft wide double-glazed window faces southwest. The window has a frame with width of 1.25 in. around the outside edge. The top of the window has a 1.5 ft overhang that extends a great distance on each side of the window. The incident angle is 60 deg, the incident direct irradiation is 120 Btu/hr-ft, and the incident diffuse irradiation is 50 Btu/hr-ft. 1- Compute the shaded area of the frame and glazing on July...
Air is flowing at.1 lbf/sec at an elevation of 50 ft and a velocity of 50 ft/sec. What is the total potential and kinetic energy in Btu/hr? zero 300 Btu/hr 41 Btu/hr 1202 Btu/hr
Air is flowing at.1 lbf/sec at an elevation of 50 ft and a velocity of 50 ft/sec. What is the total potential and kinetic energy in Btu/hr? zero 300 Btu/hr 41 Btu/hr 1202 Btu/hr
A 100 ft2 wall consists of 4 in of red brick (k = 0.38 Btu-ft/hr-ft-°F), 1 inch of pine (k = 0.06 Btu-ft/hr- ft-°F) and 42 inch of plaster board (k = 0.30 Btu-ft/hr-ft-°F). The internal and external film heat transfer coefficients are 1.65 Btu/hr-ft-°F and 6.00 Btu/hr-ft-'F respectively. The inside and outside air temperatures are 72 °F and 30 °F respectively. The heat transfer rate is:
2. Verify the conversion factors (a) 1 Btu/ft2-hr 3.1525 W/m2 (b) 1 Btu/hr -0.292 875 W (c) 1 Btu/hr ft. F -1.729 W/m-K ot 16t 105935
Mechanical Engineering Thermodynamics, ME 200 5- Workshop - Open system first law with Air as an ideal gas Pre-work (1) Write the ideal gas law? (2) What is the value of the universal gas constant in english units (both units: 2 .and... .) (3) What is the ideal gas constant for air (both sets of units)? (4) Write conservation of energy (first law) for an open system (control volume): (5) Write down the options of how to find the value...
A building has a design heating load of 63,000 BTU/hr. A series loop hydronic heating system will be used. A 2-in type M copper tubing will be selected for baseboard. Supply temperature (temperature of water leaving the boler) is 220° F and an overall system temperature drop of 300 F is permitted. Determine: a. Water temperature at exit of Unit #1(OF), b. Water temperature at the entrance of unit # 5 (OF) c. Flow rate in Unit # 5 (GPM),...
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...
You are building a new house, you can buy cheap ceiling insulation (R =11 ft2-°F-hr/Btu) or more expensive insulation (R=25 ft2-°F-hr/Btu). If the winter outside average temperature is 45°F for 4 months in HSV, and 3 months of summer (85°F). Assume that you keep the house at 70°F. • What is difference in electricity costs if electricity cost are 8 cents/kW hr? (Ahouse = 40 x30 ft) • If the difference in cost is $1,200 at time of installation, what...
A 2 ft high x 6 ft wide double-glazed window faces southwest. The window has a frame with width of 1.25 in. around the outside edge. The top of the window has a 1.5 ft overhang that extends a great distance on each side of the window. The incident angle is 60 deg, the incident direct irradiation is 120 Btu/hr-ft, and the incident diffuse irradiation is 50 Btu/hr-ft. 1- Compute the shaded area of the frame and glazing on July...
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