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….