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Please insert anything that I’m missing or something that was overlooked by me. The project is supposed to be a small motorcycle workshop, where sanding of metal parts, hammering of metal parts, and spray painting will be done.
General Ventilation Assignment
http://www.cdc.gov/niosh/npg/
. Page for reference.
1
. What is the evaporated volume, in ft
3
, of one quart of liquid toluene (at STP)?
2
. You know your process requires 20 liters of toluene during each 8-hour shift. All of this material is released into the workroom air. What is the generation rate, in mg/min?
3. The generation rate for a contaminant is 25 mg/min. The dilution volume flow rate is
4
,000 CFM. What is the equilibrium concentration of the contaminant in mg/m3?
4. A room measures 50’ x 30’ x 20’. The dilution volume flow rate is 3,000 CFM. At 8:00 am the concentration of a contaminant is 50 ppm. Assuming no additional contaminant is added to the workplace air, what will be the concentration of the contaminant at 8:00 pm?
5. With an initial concentration of 25 ppm and an equilibrium concentration of 300 ppm, if the time constant for the room is 90 minutes, what will be the concentration after 30 minutes?
6. Extra Credit for Complete Solution – This problem puts it all together. You are leaking one liter of methyl alcohol (methanol) every 3 hours. At the start of the day, you have a concentration of 50 ppm. Your room is 30’ x 20’ x 100’. The dilution volume flow rate is 4,000 CFM. What will be the concentration at the end of the day, 8 hours later?
No
ise Enclosure Project
Estimate the transmitted sound pressure level, SPL, with the noise barrier material in the bottom.
Equipment:
Hydraulic shaper machine
Paint Booth
Sandblasting
Description of Problem
Describe the problem requiring noise abatement.
Description of Barrier
Description of
Ventilation System
| Ventilation System |
Inlet fan (Direct drive motor) |
Adopt big impeller turbo fan, 7.5KW, 380V, 50HZ, CE |
|
Outlet fan (Direct drive motor) |
No | |
|
Painting and baking exchange system |
Solenoid valve+ pressure adjustment control cylinder driven damper exchange |
|
|
Fan Capacity |
25000m³ /h |
|
|
Air Flow Speed |
0.23 m/s in empty booth, 0.25— 0.35m/s in loaded booth |
Estimated Noise Reduction
Using the data provided, estimate the reduction in noise that the containment is expected to provide. Can you describe (in words) what you are calculating. You may make up any data you wish to use.
Description of Barrier
ArtSeal Blankets and Acousti Curtains™ Acousti Curtain Sound Absorption Curtains and ArtSeal Blankets are quilted fiberglass composites that feature a durable vinyl coated fiberglass cloth facing quilted to two-inch thick fiberglass insulation. The ArtSeal Acoustical Sound Blankets are available in a variety of colors and stitch patterns. The standard size is a 4’ x 8’ curtain panel with custom sizes and die cuts available. They are used when you need to introduce sound absorption materials into hard reflective environments to reduce the reverberant noise energy in a room. Some typical uses include industrial plants, gymnasiums, auditoriums, and warehouses. The ArtSeal Sound Absorption Blankets are Class 1 fire-rated and have a sound absorption rating of .85.
Sample Data
Please use the data provided below. There is no contribution from octave bands not listed. There is no transmission loss for octave bands not listed in the data for the barrier material.
User 1
|
SPL per Octave Band in dBA |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Location |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1 |
98.4 |
102.4 |
100.0 |
95.6 |
89.3 |
79.8 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2 |
99.2 |
103.5 |
99.5 |
93.0 |
88.3 |
74.9 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3 |
101.3 |
99.9 |
103.7 |
96.4 |
90.7 |
77.1 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 4 |
100.5 |
99.3 |
98.0 |
92.1 |
78.3 |
User 2
|
104.6 |
|||||
|
103.0 |
|||||
|
106.9 |
|||||
User 3
User 4
|
103.4 |
|
User 5
|
97.6 |
|||
|
94.0 |
104.5 |
User 6
|
101.5 |
||||
|
99.7 |
102.7 |
|||
User 7
|
99.4 |
101.0 |
94.6 |
|
|
99.8 |
|||
|
102.3 |
|||
User 8
SPL per Octave Band in dBA
Location
125 Hz
250 Hz
500 Hz
1 kHz
2 kHz
4 kHz
1
98.4
102.4
100.0
95.6
89.3
79.8
2
99.2
103.5
99.5
93.0
88.3
74.9
3
101.3
99.9
103.7
96.4
90.7
77.1
4
100.5
99.3
102.4
98.0
92.1
78.3
User 9
|
95.0 |
|
98.7 |
User 10
|
108.4 |
78.8 |
|
109.2 |
|
|
104.3 |
|
|
107.4 |
76.3 |
User 11
SPL per Octave Band in dBA
Location
125 Hz
250 Hz
500 Hz
1 kHz
2 kHz
4 kHz
1
104.6
102.4
100.0
98.4
95.6
79.8
2
103.0
101.5
99.5
99.2
93.0
74.9
3
106.9
99.7
102.7
101.3
96.4
77.1
4
103.5
99.3
102.4
102.4
98.0
78.3
Area of Project:
40 Feet20 Feet
Sand Blasting and
Hydraulic Shaper Machine
Paint Booth33 Feet7 Feet
40 Feet
20 Feet
Sand Blasting and
Hydraulic Shaper Machine
Paint Booth
33 Feet
7 Feet
