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Presented By :
Vishal Katiyar
Quality Assurance
A Seminar On…….
HVAC DEFINITION
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What is HVAC Full Form?
Heating, Ventilation, Air Conditioning
PURPOSE In simple words –The system is used to provide heating and cooling services
to buildings.
FUNCTION Control airborne particles, dust and micro-organisms Maintain room pressure & air changes per hour Temperature & RH
USE To prevent contamination To provide comfortable working conditions
MEANING OF WORDS USING IN HVAC
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HVAC UNIT
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Diagram of mechanical system on the blackboard
Secondary FILTER (5 micron)
FRESH AIR (10 to 20%)
HEPA FILTER (0.3 micron) Pre FILTER
(10,20,50 micron)
HVAC
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AHU
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HOW HVAC SYSTEM WORK
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FILTER TYPE
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HEPA FILTER SECONDARY FILTER
RETURN FILTER PRE FILTER
FILTER TYPE SPECIFICATION
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HEPA FILTER
SECONDARY FILTER
PRE FILTER PreFilter -10,20,50 micron (Efficiency - Upto 80-95%) MOC : Metallic, Synthetic A filter's ability to remove large airborne particles from the air e.g dust,plant spores,fertilizer,household dust
Secondary Filter - 5 micron(Efficiency - Upto 99%) MOC : Synthetic, HDPE(High-density polyethylene) A filter's ability to remove small airborne particles from the air e.g coal dust,House hold dust,Bacteria
HEPA Filter – 0.3 micron(Efficiency - Upto 99.97%) HEPA : “High Efficiency Particulate Air” MOC : Borosilicate microfibres A filter's ability to remove at least 99.97% of dust, pollen, mold, bacteria and any airborne particles with a size of 0.3 micrometres (μm)
Particle Size
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DUCT
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Validation of AHU/HVAC System
Temperature control test
Humidity control test
Filter integrity test
Air velocity test
Air flow pattern(Smoke test)
Microbial test
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Test procedure:-
Environment is divided by a grid
Size of square- 60cm×60cm or more
Sampling location- work height
Result compare with specification
60×60
cm
Objective:- To demonstrate the ability of the HVAC system to control temperature.
Acceptance criteria:- Temp. 23±2ºC
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Equipment- Thermometer
2.Humidity control test:-
Acceptance criteria:- Humidity: 60±5%
Data Logger
Objective:- To demonstrate the ability of the HVAC system to control humidity.
Test procedure:-
Environment is divided by a grid
Size of square- 60cm×60cm or more
Sampling location- work height
Result compare with specification
60×60
cm
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3. Filter Integrity Test:-
Objective:- To provide evidence of the integrity of the HEPA filter
Acceptance criteria:-
99.97 efficiency- 0.03% particles of 0.3 µm
99.99 efficiency- 0.01% particles of 0.3 µm
100% 0.03%
HEPA filter
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Air flow velocity and uniformity test:-
Test procedure:-
Environment is divided by grid
Measure by Airflow meter
Fig.- Airflow meter
Fig.- laminar air flow unit
Acceptance criteria:-
Vertical flows 0.30 m/sec ± 20%
Horizontal flows 0.45 m/sec ± 20%
Action: Deviation indicates blockage of filter
Solution : Alteration of fan speed
HEPA filter replacement 16
Generate visible smoke upstream from the work zone
Establish the reference point
Videotape the direction of the flow in both case
Determine the direction
Test procedure:- (smoke test)
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MICROBIOLOGICAL TESTS :-
Solid growth media
Sampling conditions
Sampling in the at rest condition may be continued at an agreed frequency to monitor baseline contamination levels.
The operational conditions and the activities being performed at the time of testing should be recorded.
Incubation conditions Incubation of samples, inverted, at 20 – 25C for at least 5 days is suitable for the growth of mould and fungi.
Incubation of samples, inverted, at 30 - 35C for at least 2 days is suitable for the growth of bacteria.
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1. Health-Care Facilities
Residences
2. Educational Facilities
3. Laboratories
4. Pharmaceutical
Industries
5. Non Pharmaceutical
Industries
6. Tall Buildings
7. Hotels
8. Places of Assembly
9. Nuclear Facilities
10. Commercial and Public
Buildings
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SUMMARY….
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