HEPA Filter

HEPA Filter PowerPoint PPT Presentation


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Project Objective. To design a HEPA filter / spot cooler system that maintains the 14'x8'x8' class 100 clean room at a temperature of 72

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HEPA Filter

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1. HEPA Filter / Spot Cooler David Elting Rodolfo Gonzalez Gerardo Espinoza Christopher Goulet

2. Project Objective To design a HEPA filter / spot cooler system that maintains the 14’x8’x8’ class 100 clean room at a temperature of 72°F and filters 99.97% of all particles <0.3µm in diameter. Main Question: How many cfm to filter, and cooling load in tons for the spot cooler?

3. Design Parameters Maintain Room Temperature ~ 72°F (Spot Cooler) 99.97% efficiency (Filter) Filter Particles <0.3µm in diameter ASHRAE notes that 85% - 95% of the ceiling should be covered with filters

4. Volumetric Flow Rate Currently, flow rate is at a maximum of 7920 cfm at manufacturer’s maximum velocity of 90 fpm. ASHRAE suggests a flow rate of 50 fpm multiplied by the surface area of the ceiling for a class 100 clean room. In our case: 14ft*8ft*50 fpm = 5600 cfm

5. Cleanroom Air Velocity and Air Changes For a given cleanroom, the supply air volume Q (cfm) is:

6. Wall Heat Gain

7. Ventilation Flow Rate There are 7 air return ducts in the clean room, only one of which goes to the spot cooler.

8. Fresh Air Cooling Load Energy Balance:

9. Fresh Air Cooling Load

10. Lighting Heat Gain

11. Occupancy Heat Gain Heat gain from a single occupant performing light work can be estimated as:

12. Total Cooling Load

13. References ASHRAE Technical Committees and Task Groups. 2001 ASHRAE HANDBOOK, FUNDAMENTALS, Inch-Pound Edition. Atlanta: American Society of Heating and Air-Conditioning Engineers, Inc. 2001. Cengel, Young A., and Michael A. Boles. Thermodynamics an Engineering Approach. 5th. Boston: McGraw Hill, 2006.

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