HVACHow to save energy

(part 1)

State Energy Assessment WorkshopBy:

DTE Energy Partnership & Services

2

HVACH – heatingV – ventilationAC – air conditioning

3

HVAC components1. Building2. Airduct system3. Heating Hot water

system4. Steam/condensate

system5. Cooling tower water

system6. Chilled water system7. Refrigeration system

4

HVAC system is a group of components working together

5

6

Building

Convection

ConductionRadiation

7

Building loadsWinter Summer

Conduction ConductionSolar

radiationInfiltrationInternal

heat gains

8

Roof insulation

9

Windows sealing and caulking

Pressurize area for 10%

10

Tined film (reduce shading coefficient from 0,65 to 0.22)

Avoid skylights

12

Attic Ventilation

13

Use energy efficient lights, occupancy sensors, timers

14

15

Economizer

16

Use free cooling in spring

Drop down temperature at night

Use CO² sensors

18

Air Conditioning Fans

19

Constant Volume

20

Variable Air Volume

21

Shut down system

Use VAV

Fan efficiency

22

Duct Work

23

Clean ductwork

Insulate ducts

Avoid flat duct

Clean filters

24

Refrigeration System

25

Refrigerant piping must be insulated

Clean condenser surface

Use new technologies Hy-Save (booster pump and sub cooling) Energy wheel

26

27

Energy Wheel

28

29

Your home HVAC

30

Do not open windows when system is “on”Insulate roofSeal windowsUse timersVentilate attic in summerTurn down electrical devicesTurn down exhaust fan in toilet roomOrganize cross ventilation for cooling

31

32

Condenser

33

Clean condenser

Do not oversize unit

34

35

Air Handler

36

Clean filters

Fan lifetime < 15 years

37

38

Clean ductsDo not block registers and grilles

39

Enjoy your home

40

The endWake up now!