CEE 243. Week 2 HVAC systems at Y2E2

Transcription

1 Week 2 HVAC systems at Y2E2

2 Today s lecture will focus on HVAC systems and the type of systems contained in Y2E2 Basic info about Y2E2 Contains a diverse range of HVAC Systems and zone equipment Introduce the data collection system and how to access that data Introduce Product Hierarchies to begin data analysis 2

3 This class focuses on the analytical process to understand actual building performance HVAC Systems at Y2E2

4 Y2E2 design intent: maintain thermal comfort in spaces by using the minimal amount of energy 4

5 HVAC systems must account for a variety of interrelated factors and ensure building function Room Building geometry Constructions and Materials Internal loads People Lights Equipment Solar gains Air infiltration HVAC system System type Equipment parameters Operating schedules Controls Weather 5

6 Y2E2 is a new, large multi-purpose building 4 stories with approx 160,000 sf A diverse range of space types ensures a worthy challenge for analysis 6

7 Low energy features to mitigate peak load & reduce overall energy consumption Atria provide daylighting, support natural ventilation Manually and automatically operable windows support natural ventilation 7

8 Exposed concrete floors increase building thermal mass 8

9 Active beams provide efficient conditioned fresh air to spaces: mostly passive 9

10 Small PV units on roof contribute 1-2% of total building electricity PV Arrays 10

11 District heating and cooling supplies most of the hot and chilled water required on campus Cardinal cogeneration plant 11

12 HVAC Systems

13 Stanford CoGen Plant HVAC Systems at Y2E2 supplies chilled water directly, steam to tempered water heat exchanger for heating Cold water loop Secondary loop AHU Coils Fan coil: coils CAV/VAV box: coils Active beams (cooling) Heat Exchanger Hot water loop Secondary loop AHU Coils Baseboard radiators CAV box: coils Active beams Radiant slab VAVs (heating) 13

14 Main chilled water loop serves cooling coils and server rack and tempered water loop Serves: Tempered water loop Cooling coils (AHU, FC, CVs, VAVs) Server Rack 14

15 Main chilled water loop Serves: Tempered water loop Cooling coils (AHU, FC, CVs, VAVs) Server Rack 15

16 The tempered chilled water loop serves active beams Serves: Active beams 16

17 Tempered chilled water loop Serves: Active beams 17

18 The main hot water loop serves heating coils, radiators and tempered water loop Serves: Tempered water loop Heating coils (AHU, CVs) Radiators 18

19 Main hot water loop Serves: Tempered water loop Heating coils (AHU, CVs) Radiators 19

20 Tempered hot water loop serves active beams radiant slab, heating coils (VAVs) Serves: Active beams Radiant slab Heating coils (VAVs) 20

21 Tempered hot water loop Serves: Active beams Radiant slab Heating coils (VAVs) 21

22 Zoning Example: 2 nd Floor

23 Integrated HVAC air systems serve offices and exhaust through an atrium Outside Air AHU CAV or VAV box CAV or VAV box Atrium Active beam (cooling/ heating) Active beam (cooling/ heating) Diffuser Active beam and/or diffuser Zone 1 Zone 2 Zone 3 Zone 23

24 North facing space contain radiators to balance out fabric losses Fabric heat loss through materials w/ temperature difference, e.g., walls, windows, floor, roof. 24

25 A typical air handling unit contains fans, coils and HR HR = heat recovery subsystem 25

26 Air handling unit 26

27 Fan coil units condition mechanical, electrical and data rooms 27

28 Active beams provide supplementary heating or cooling 28

29 Two representative offices on the north side contain measurement points for radiant heating and ceiling 29

30 Two representative offices on the south/west side contain measurement points for active beams Active beams for heating and cooling 30

31 The overall mechanical ventilation strategy uses atria for to exhaust air 31

32 Naturally ventilated perimeter zones exhaust to the atria, air flow rates are controlled by dampers 32

33 The control system enables building and campus wide access to data LONWORKS based control system ilon servers as interface between LON and Ethernet Tobias data logger Saved at one minute interval into MySQL database Data access via MySQL client IP: Username: CEE243 Password: Iwantmoredata More info in tutorial 33

34 Product Hierarchies (original) enable a view of buildings for the purpose of performance analysis Portfolio Site Building Building Story Tennant Zone/Micro Zone HVAC Systems System Components Zone/Micro Zone Legend: Physical asset System or component HVAC Systems Has Part 34

35 Product Hierarchies (Maile 2010) link geometric and HVAC representations of building objects 35

36 Product Hierarchies have multiple uses including displaying efficacy of measurement points 36

37 Product Hierarchies: Y2E2 37

38 Concluding 38

39 39