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Results of HVAC system monitoring of tertiary buildings in Italy

2. Presentation overview. CS ITI

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Results of HVAC system monitoring of tertiary buildings in Italy

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    1. Results of HVAC system monitoring of tertiary buildings in Italy M. Masoero, C. Silvi, J. Toniolo Politecnico di Torino Ljubljana, 30 September 2009

    2. 2 Presentation overview CS ITI – ITIS Retirement Home, Trieste FT EID – Eidos Offices and Laboratories, Chieri (TO) FT SRI – Surgery Rooms, Ivrea (TO) Hospital FT FIN – FinAosta Office Building, Aosta FT CAR – Carignano Theatre, Torino ECO Assessment: night time overventilation CS ATC – ATC Office Building, Torino CS RPC – Regione Piemonte Headquarters, Torino CS ENV – EnviPark Offices and Laboratories

    3. 3 CS ITI – ITIS Retirement Home, Trieste

    4. 4 Chiller consumption (September 2008) Continuous occupation: no system setback at night, or in the weekend The daily chiller consumption is well correlated with outdoor temperature Climatic control operates correctly with a one day time lag due to high thermal capacity of the building (masonry bearing walls) Annual chiller specific consumption is 30.5 kWh/m2

    5. 5 Breakdown of electrical consumption Two meters are present: one for the chiller + water pumps and one for the other uses (including lights, equipment and AHUs) Data are collected every 15 mins; chiller + pumps consumption almost constant; no significant differences between Wed and Sun

    6. 6 FT EID: Eidos Offices and Laboratories

    7. 7 Overall scheme of the system

    8. 8 BEMS monitoring Two electricity meters: Central plant board (HP + borehole pumps + hot / chilled water pumps) Air Handling Unit board (2 AHUs)

    9. 9 Breakdown of system consumption WINTER SEASON: NOV – MAR MIDDLE SEASON: APR, MAY, OCT SUMMER SEASON: JUL - SEP The circulation pump contribution was estimated from central plant consumption data measured when the HPs were not running

    10. 10 Breakdown of system consumption

    11. 11 FT SRI – Surgery rooms, Ivrea Hospital Measured data: Air temperature in each room (T1, T2, T3) External air temperature (TEXT) Chilled water temp. (TcIN, TcOUT) Electric power input to electric chillers EC1 (Pc1) and EC2 (Pc2) Electric power input to AHU (PUTA)

    12. 12 Instrumentation details

    13. 13 Monitoring results Chilled water production is always active: AHUs are simultaneously fed with chilled water and hot water for reheating. System and environmental monitoring indicates that chillers are kept running even when low outdoor air temperature should allow free cooling Winter (Nov 2008 – Feb 2009) chiller specific consumption 337 kWh/m2 The following data were gathered over one month in December 2008 – January 2009:

    14. 14 Monitoring results

    15. 15 Monitoring results

    16. 16 FT FIN – FinAosta Office Building, Aosta In this building too, the chillers are running year-round AHUs provide thermally-neutral primary air (19°C) to the active chilled beams Simultaneous air cooling and heating may take place in the AHU HVAC electrical energy consumption (including chiller + water pumps + evaporative towers) subdivided in four periods are given in the table below:

    17. 17 Monitoring results

    18. 18 Monitoring results

    19. 19 FT CAR – Carignano Theatre, Torino

    20. 20 ECO assessment: night time overventilation Night time over ventilation allows to reduce the peak energy consumption which occurs in the early morning hours on Monday, in order to restore indoor comfort temperatures after system shutoff during the weekend The analysis has been applied to three case studies in Torino:

    21. 21 CS ATC – ATC Office building, Torino The analysis is made by comparing the energy consumption in the first two hours of occupancy (8-10) with the consumption from the third hour onwards, i.e. after at least two hours of HVAC system operation. It is assumed that night time overventilation would level down the consumption of the first two hours, leading to an estimated 2.2% annual energy saving. The assumption probably underestimates the potential savings, since it does not take into account the likely increase of space cooling load taking place during the morning

    22. 22 CS RPC - Regione Piemonte Headquarters A similar analysis is perfomed on the Regione Piemonte HVAC system, by considering the Monday morning energy consumption between 8:00 and 11:00. In this case a cross check of the result is possible by comparing the 2008 monitoring results (when weekend system setback was adopted) with the summer 2007 monitoring results, when the system was kept running also during the weekend (a situation comparable to night overventilation).

    23. 23 CS ENV - EnviPark office and laboratories

    24. 24 Estimated energy savings

    25. 25 THANK YOU FOR YOUR ATTENTION! marco.masoero@polito.it

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