3 years. PIBCV application and benefits. Stanley de Vries Business Development Director.

Transcription

1 PIBV application and benefits Stanley de Vries Business Development Director 3 years Payback time ase studies prove that investing in PIBV s pays itself back in less than 3 years.

2 Agenda AB-QM PIBV Actuators What is a good PIV ΔT in the system hiller lift VFD sensor placement ΔT issues Danfoss DS onclusion

3 What is a PIBV? Pressure Independent Balancing and ontrol Valve (PIBV): ontrol valve Automatic balancing function

4 Applications AHU, Heating/ooling PIBV Balancing & ontrol

5 Applications Fancoil unit, Heating/ooling PIBV Balancing & ontrol

6 How does a PIBV work Schematic overview Pressure controller ontrol valve + Setting

7 How does a PIBV work The top part is a control valve

8 How does a PIBV work The bottom part is a differential pressure controller that keeps a constant differential pressure across the control valve independent of pressure fluctuations in the system

9 How does a PIBV work The pressure controller keeps a constant differential pressure across the control valve Q = Kv x P onstant differential pressure means: onstant flow Full authority

10 What is a good PIBV? Membrane driven hollow cone type Stroke limitation alibrating actuator Precise and predictable characteristic

11 Membrane driven hollow cone - Hollow cone ensures easy passage of dirt

12 artridge type Presetting Often plastic-on-plastic or metal-on-plastic movement. Not robust. Small openings (easy to clog) Low presettings will increase clogging problems (beware of overspecified valves)

13 Stroke limitation (and why you want it) Full stroke valves P1 P2 P3 M What they say it is What it actually is alculation example: P1-P3 kept constant by K at 15 kpa Without presetting: P1-P2=0 P2-P3=15 With presetting 50% P1-P2=7,5 P2-P3=7,5 This means, by defniniton: Authority 1!!

14 BSRIA report Full stroke valve

15 Stroke limitation (and why you want it) M AB-QM uses the same device (control valve) to both control and limit the flow This is the only way you can have authority of 1 We are using the calibration function of our actuators to compensate for the shortened stroke We have proven ability to control small flows (demo panel) 15

16 BSRIA report Stroke limitation

17 onclusion A good PIV has: Authority 1 (so stroke limitation) Hollow cone membrane driven pressure controller Is equipped with a calibrating actuator Has a precise and predictable characteristic for stable control

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19 Energy consumption Energy consumption 5% 25% 30% 40% hiller Fans Pumps Other In HVA installations the hiller, Fans and Pumps consume the majority of the energy needed for cooling the building

20 OP OP hiller efficiency VFD chiller lassic chiller Load Load The OP is not constant! It depends on Load & Lift. Lift changes OP at same system load!

21 Design lift Temperature Preparation of chilled water HILLER 45 Outside air condensing temperature (Tcon) & pressure ondenser 45 High Pressure gas ondenser High Pressure liquid 30 T air 30 Refrigerant loop 12 T cw 7 Low Pressure gas Evaporator Low Pressure liquid Evaporator evaporating temperature (Tevap) & pressure hilled water return hilled water supply T con = f(t air ) =f (weather conditions) 12 Building 7 T evap = f(t cw ), T cw = T cw,sup+t cw,ret 2 = f (cooling system)

22 Temperature Design lift NEW LIFT Preparation of chilled water Outside air 45 condensing temperature & pressure ondenser High Pressure gas ondenser High Pressure liquid 30 T air Refrigerant loop 10 T cw Evaporator hill.water 7 Low Pressure gas hilled water return Evaporator Low Pressure liquid hilled water supply NEW evaporating temperature & pressure 10 Building 7 Low T syndrome causes a LIFT increase (more work for the compressor) When the LIFT increases, OP decreases!!!

23 DEN Temperature requirements-design 6 Texchange= 1 7 ΔT = 6 12 HEAT EXHANGER 13

24 Traditional ontrol strategies Increase pump speed for more flow ontroller TS ΔP HEAT EXHANGER

25 oil haracteristic Low ΔT Syndrome! Undercapacity for coils! example : velocity 1m/s Power Output 100 % 75% 50 % 25% 6 7 0% 0% 25% 50 % 75 % Flow 100 % ΔT = HEAT EXHANGER 13 10

26 Overflows means lower output 100% Overflow = 10% power output 110% 100% 75% 50% 0% Flow rate 0% 25% 50% 75% 100% ooling coil character Wasted pumping range 200%

27 Solution: Use Danfoss Pressure independent Balancing and ontrol Valve ontroller TS AB-QM Load 1 Load Load Load Load ΔP HEAT EXHANGER

28 ΔT: onclusions The hiller is the biggest energy consumer in the system and it s efficiency is dependent on the lift weather conditions (uncontrollable) ΔTW Low ΔTW will also cause low ΔT syndrome In D systems proper flows will ensure proper temperatures Proper ΔT in the system will prevent fines and reduce energy bills The efficiency is therefore heavily dependent on providing the correct ΔTW which can only be achieved with proper hydronic balance 3% Increased energy consumption when T cw drops for 1ºK

29 Future developments of PIBV

30 4 system components combined in 1 actuator Actuator Novoon is a highly accurate multifunctional actuator Flow indicator Novoon indicates flow through the AB-QM valve Bus communication device Novoon enables more than flow control via Fieldbus Data logger Novoon stores data to compare building performance

31 Direct bus communication BMS OLD vs NEW GBS Direct ontroller 2-way Bus actuator BMS

32 Benefits of integrated bus communication onventional Building Automation System Bus actuator DD DD Room ontrol 0-10V 0-10V Room ontrol 0-10V 0-10V

33 Benefit: Remote setting of design flow Digital PRE-SET Design flow l/h NO MANUAL PRE- SET

34 Benefit: Remote features Flushing program 50% De-air program

35 Time to close ceiling: onventional Install PIBV Fill the system Flush De-air Pre-set Install actuator lose the ceiling

36 Time to close ceiling: Bus actuators Install bus actuator +PIBV lose the ceiling Afterwards by BMS Flush De-air Flow setting

37 Spread the workload Novoon onventional

38 Remote status feedback Error: No signal Error: alibration Warning high temperature electronics Warning abnormal supply voltage losing error due to obstruction No 0-10V control signal

39 onclusion PIBV = Pressure Independent Balancing and ontrol Valve PIBV ensure proper balancing and control Both chiller installations and Distric ooling systems benefit from PIBV s because of precise ΔT In the future installations will be more connected Bus connected actuators will be the next trend 39

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