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BOA HVAC. H V A C Outline F Thermostats F Efficient use of ventilation fans F System overrides F Building automation systems F Indoor air quality F Energy.

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Presentation on theme: "BOA HVAC. H V A C Outline F Thermostats F Efficient use of ventilation fans F System overrides F Building automation systems F Indoor air quality F Energy."— Presentation transcript:

1 BOA HVAC

2 H V A C Outline F Thermostats F Efficient use of ventilation fans F System overrides F Building automation systems F Indoor air quality F Energy savings tips F Maintenance issues

3 H V A C Piner Olivet Lifestyle Program F Lifestyle Campaigns F students and teachers F custodian support F Examples F Computers off F Lights off F Waste less

4 H V A C Piner Olivet Technical Program F Student technical audits F Building Operator Training F Technical audits F Energy monitoring and savings reports F Building retrofits

5 H V A C Importance of custodian F Focus of Piner Olivet program in schools F Interface between district, teachers and students F Source of technical information F Provides continuity F Knows schools better than anyone F Can produce large savings F Key to Piner Olivet program success

6 H V A C Piner Olivet district update F Lifestyle Program news F Recent events F Upcoming events F Technical Program news

7 H V A C Piner Olivet in your school F Success stories F Areas to improve

8 H V A C Benefits of energy efficient HVAC F Reduces energy use and cost F Improved quality and comfort F Less maintenance required F Longer equipment life F Scheduling and complex control strategies easily programmed F Positive impact on climate change issues

9 H V A C Expectations of comfort F Wide range of operating conditions F Realistic expectations F Comfort conditions not always perfect F Impossible to satisfy everyone

10 H V A C Thermostats F Pneumatic, electric, or electronic F Control furnaces, radiation heating valves, heat pumps or unit ventilators F Often damaged or vandalized

11 Thermostats A thermostat and its workings H V A C

12 Thermostats F Avoid covering thermostat F May not sense actual room temperature F Room becomes too cold or too hot F Do not constantly change setpoint F Calibrate and service regularly

13 H V A C Thermostat mythology F A high temperature setting means quicker warm-up F Furnace works harder after temperature setback F Inadequate heating or cooling is due to a faulty thermostat

14 H V A C HVAC in portables F Thermostat controls ventilation fan plus heating and cooling F Vacant periods in warm weather: F Furnace fan set to “off” position F Cooling setpoint as high as possible F Heating setpoint at 15°C F Vacant periods in cold weather: F Furnace fan set to “auto” position F Cooling setpoint as high as possible F Heating setpoint at 15°C

15 H V A C HVAC in portables F Are programmable thermostat setbacks working? F Advise maintenance staff if need adjustment F Cooling setpoint of 21°C or lower can damage equipment

16 H V A C HVAC in portables F Thermostat “Auto/On” ventilation fan setting F Auto: fan cycles on call F use during vacant periods F On: fan operates continuously F use during occupied periods for improved indoor air quality F No outside air ventilation if fan is off

17 H V A C Efficient use of ventilation fans F 30% of total energy use F Electricity for large motors F Energy to heat or cool outside air F Shut off ventilation fans during vacant periods F Operate fans only when needed F One of the most important energy savings strategies

18 H V A C Air handling system

19 H V A C Return air fan

20 H V A C Axial return air fan with variable inlet vanes Return air fan

21 H V A C Supply air

22 H V A C Centrifugal supply fan

23 H V A C Cooling and night purging F Don't run fans all night F Two hours before occupied periods to cool down the facility (night purge) F Outside air coolest between 4 a.m. and 7 a.m.

24 H V A C HOA switches F Hand-Off-Auto switch F Controls fans, pumps, etc. F “Hand”: manual bypass of BAS or time clock F Used as override F Equipment will operate continuously

25 H V A C HOA switches F “Off”: equipment off completely F For repairs, safety, etc. F Do not switch to “On”or “Auto” unless verified safe F “Auto”: links equipment to time clocks and BAS schedules F Should be usual position

26 HOA switch H V A C

27 System overrides F Activating HVAC system after hours F Short-term intermittent use F 2 or 3 hour limit is best F Spring-wound timers often used for fans

28 System override Spring-wound timers H V A C

29 System override Air system override H V A C

30 System overrides F Day/night thermostats may have push button overrides F Dedicated override switch preferred to HOA switches F Ask to have one installed if needed

31 H V A C Time clocks F Automatically switch HVAC equipment F Check and reset for: F Changing schedules F Clock going out-of-time F Daylight savings time F Correct schedule for the application?

32 Electronic time clock H V A C

33 Building Automation System (BAS) F Centralized computer control operates HVAC, alarms and lighting F Makes automatic decisions F Computer used to access system F Available in a variety of configurations

34 H V A C Building Automation System (BAS) F Also called: F Energy Management System (EMS) F Direct Digital Control (DPiner Olivet) F Replaces old system of mechanical time clocks and pneumatic controls

35 Pneumatic control panel H V A C

36 Pneumatic controls H V A C

37 Building Automation System H V A C

38 How a BAS is networked H V A C

39 BAS for an air handling unit H V A C

40 Advantages of BAS F Optimum start/stop F Temperature reset F Economizer control F Night purge

41 H V A C Advantages of BAS F Intelligent control F Trend logging F Flexibility F Reliability F Global and networked control

42 H V A C Indoor Air Quality (IAQ) F Acceptable levels of: F Carbon dioxide F Carbon monoxide F Temperature and humidity F Respirable particulates F Fungi and bacteria F Miscellaneous

43 H V A C Indoor Air Quality (IAQ) F IAQ is a complex issue F Can be blamed for unrelated health problems F Increasing attention paid to IAQ F Regulations and standards being developed

44 H V A C Indoor Air Quality (IAQ) F Custodians can note potential IAQ problems F Simple IAQ improvements: F Comfortable temperatures F 19 to 24.5°C in winter F 22 to 26.5°C in summer F Optimum humidity F 40 to 60% F Avoid sources of contamination

45 H V A C Some ways IAQ is affected F Inadequate fresh air F Inadequate local exhaust F Contamination of outdoor air intakes F Low efficiency or dirty filters F Mould and bacteria growth

46 H V A C Some ways IAQ is affected F Polluting sources: F Cleaning solutions and chemicals F Off-gassing from synthetic carpets and furniture F Dry sewer traps emitting sewer gas F Trash stored indoors F Tobacco smoke

47 How IAQ is affected Filters in poor condition H V A C

48 Miscellaneous energy savings tips F Vestibule heaters - reduce temperature F Use vestibule doors effectively F Note if temperature setback is working F Effective use of blinds and curtains F Use ceiling destratification fans F Shut off exhaust fans if not required

49 Energy-saving tips Do not overheat vestibules with heaters H V A C

50 Energy-saving tips Keep inside entrance doors closed H V A C

51 Energy-saving tips Skylight blinds should be closed in summer H V A C

52 Energy-saving tips Shut off exhaust fans if not required H V A C

53 Miscellaneous energy saving tips F Maintain weather-stripping and caulking F Use electric heaters sparingly F Avoid obstructing HVAC grilles F Check outside air intakes for lint etc. F Close doors to isolate some HVAC zones F Other ideas?

54 Energy-saving tips Door requires weather-stripping upgrade H V A C

55 Energy-saving tips Sharp elbow at outlet of dust collector discharge duct reduces efficiency H V A C

56 Energy-saving tips Do not block hot water grilles H V A C

57 Energy-saving tips Do not block ventilator grilles H V A C

58 Energy-saving tips Keep furniture at least 5 cm away from hot water grilles H V A C

59 Energy-saving tips Maintain control air compressor H V A C

60 Maintenance issues F Record boiler and chiller temperatures and pressures F Report unusual noise, odours F Clean and change filters as needed

61 Filter maintenance Clean air dryer and filters H V A C

62 Filter maintenance Filters in very poor condition H V A C

63 Filter maintenance Filters clogged with dust H V A C

64 Filter maintenance Magnehelic gauge showing pressure drop across filters H V A C

65 Custodian is key to program success F Focus of conservation initiatives F Interface F Technical information F Continuity F Facility knowledge F Impact on savings F Key to success

66 H V A C


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