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Transcript of hvac_basics
HVAC SYSTEM
Presented By :Vishal Katiyar
Quality Assurance
A Seminar On…….
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HVAC DEFINITIONWhat 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
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MEANING OF WORDS USING IN HVAC
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HVAC UNIT
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)
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HVAC
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AHU
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HOW HVAC SYSTEM WORK
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FILTER TYPE HEPA FILTER
SECONDARY FILTER
RETURN FILTER PRE FILTER
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FILTER TYPE SPECIFICATION
HEPA FILTER
SECONDARY FILTER
PRE FILTER PreFilter -10,20,50 micron (Efficiency - Upto 80-95%)MOC : Metallic, SyntheticA 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 microfibresA 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)
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Particle Size
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DUCT
Validation of AHU/HVAC System
Temperature control test Humidity control test Filter integrity test Air velocity testAir flow pattern(Smoke test)Microbial test
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1.Temperature control test:-
Test procedure:-Environment is divided by a gridSize of square- 60cm×60cm or moreSampling location- work heightResult compare with specification
60×60cm
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 gridSize of square- 60cm×60cm or moreSampling location- work heightResult compare with specification
60×60cm
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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 replacement16
AIR FLOW SYSTEM (SMOKE TEST ) :-
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. Laboratories4. Pharmaceutical
Industries5. Non Pharmaceutical
Industries6. Tall Buildings 7. Hotels 8. Places of Assembly 9. Nuclear Facilities 10. Commercial and Public
Buildings
APPLICATIONS OF HVAC
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SUMMARY….