hvac design verfication during commisisoning

7/30/2019 HVAC Design Verfication During Commisisoning

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R. SAHAY

FOUNDER & CEO

DESIGN VERIFICATION DURING

COMMISSIOING OF HVAC SYSTEM

Nov 7-8, 2012 Acreserve India 2012, Bangalore


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Design Verification During

Commissioning

When does the design verification forcommissioning start?

After end user occupies and complains.

After commissioning and testing. After completion of erection when

commissioning team comes to site.

After approval of drawings & data sheets

After completion of tender documents After freezing of Design and BOQ

After completion of concept design.

Acreserve India 2012, BangaloreNov 7-8, 2012


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Design Verification During

Commissioning

Process of design verification should start from thecompletion of design scheme and operating logic.

CxA should get involved in the design presentation.

CxA should then create the results that needs to beachieved to meet the design and scheme intent.

These then should be co-ordinated with the designerto have the testing points/ testing provisions

incorporated in the design to enable thecommissioning team to take the proper data forevaluation.



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Commissioning Team - Specialist

Involve the commissioning team during thedesign review meeting or data sheet approval.

The control logic and reasoning should be part

of the review/ briefing. The commissioning team should inform the

execution team about the requirement of

provisions for measurements. Final check at site, before the completion of

erection and pre-commissioning activity.



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Tips

Plan for the pre-commissioning, then testing and then balancing.

Start the performance evaluation after all of above has beensatisfactorily completed by respective experts.

Break down the whole performance testing activity into small parts.

LOW SIDE

AIR

Area/Unit, conditions, control wise- WATER

Zone, AHU, Shaft, Plant.

EQUIPMENT

REMEMBER -

For every AHU/ Area, separate commissioning test report sheetsshould be used.



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Conditioned Space Commissioning

The design data for the room/ area to be the start

point.

Data to be included

- Area with the drawing highlighted.

- Conditions required.

- Time of the day operations.

- Load bifurcation without occupancy/ equipment.

- Control system and logic of operation.

Acreserve India 2012, Bangalore

Nov 7-8, 2012


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Water Side

While taking the equipment CFM and DB and WBtemperatures, it is important to take the waterside reading simultaneously.

Thus you can compare the enthlapy difference ofair across coil to the water temperaturedifference across coil with mass flow rates.

Correct the same for the seasonal variation.

Compare the same with design data given indesign sheet for load w/o equipment andoccupants.



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EQUIPMENT SIDE

AHU

SPECIALISED AHU

PUMPS COOLING TOWERS

CHILLERS

BMS CONTROL LOGIC



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AHU

Parameters

Chilled water flow rates,

Chilled water temperature in/ out,

Air flow rates,

Air temperature in/ out DBT & WBT/ RH,

Fan Static Pressure,

Fan RPM, Motor RPM, Motor power,

Noise.



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SPECIALISED AHU

Any other parameter involved CFMs at various sides of heat/ enthalpy

exchangers.

DBT & WBT at each inter-phase/ section, Any water/ brine flow rates and temperatures

measurement IN/OUT.

Static pressure across each of the sections.

Fan motor power for each of the fans.



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PUMPS

Inlet and outlet pressures.

Flow rates.

Position of valves

Power consumption.



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COOLING TOWERS

Water Flow rate

Air Flow Rate

Water temperatures In/Out Air Temperatures DBT & WBT In/ Out

Fan RPM,

Fan Power. Noise



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CHILLERS

Water flow rates Chilled & Condenser water

Water Temperatures IN/ OUT

If Air Cooled Air flow rates Air Temperatures - In/ Out

Power consumption for condenser fans

Power consumption for the chiller package.



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TIPS


Remember the design verification exercise is nota fault finding exercise,

Nor is it a manipulation and handing overexercise.

Take genuine readings and do not enterinformation to match data sheets.

A correctly measured and verified plant willminimise your site revisits in guarantee/

warrantee periods, minimising your costs andtime.

Example of a design verification process -


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TIPS

Highlight the parameters which will bemeasured from the approved data

sheets.



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TIPS Highlighted Data Sheet



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TIPS

Create formats prior to the

commissioning process, include the

approved data sheets.



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VOLTAGE R 402

Y 402

B 401

AMPS R 19.6Y 19.6

B 19

POWER R 11.5

Y 11.1

B 11POWER FACTOR R 0.8

Y 0.8

B 0.8

FLOW (USGPM) 757.666

FLOW (M3

/HR) 172.197PRESSURE AT DISCHARGE (KG/CM2) 3.6

PRESSURE AT SUCTION (KG/CM2) 2

TOTAL HEAD, M 16

POWER TO MOTOR (KW) 11.20

PUMP EFFICIENCY 84.59Acreserve India 2012, BangaloreNov 7-8, 2012


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TIPS

List the instruments to be used.



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TIPS Instruments

Pump pressure Glycerine filled pressure

gauge at suction and discharge.

Pump Flow Ultrasonic flow meter at header.

Pump Power Three Phase Clamp type power

meter

Calculation -

Pump Efficiency

(Flow M3/Hr x head M/ (367.2 x IKWx 0.96x0.92)



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TIPS - General

Ensure that the calibration is done in time so

that the expiry is not around the corner.

Visit the site and inform well in advance the

locations wherein the data needs to be taken.

Do not take the performance readings in

temporary/ construction power supply.



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THANK YOU

Question

R.Sahay

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hvac design verfication during commisisoning

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