Download presentation

Presentation is loading. Please wait.

1
**Doing without and more with less**

Conservation Doing without and more with less

2
**Outline Energy conservation Principles Space heating Lighting**

Recycling Transportation Industry

3
Why conservation? Electricity Conservation saves 3 X as much fuel as the energy you don’t use. Therefore, a 3-fold reduction in pollution Saves money Deprivation: Dealing with less. Efficiency: Doing more with less

4
Home heating The goal is to maintain a constant, comfortable temperature. Therefore, Heat in = Heat out. Heat out: Conduction (50-70%) Convection (up to 30%) Radiation (5-10%)

5
Conduction losses The rate of heat loss (power loss) is proportional to the temperature difference and the surface area. Qloss/t = k A T Material of heat conductivity, k Area T outside T inside Q loss

6
Reducing heat losses Heat loss is proportional to temperature difference. Q1 / Q2 = T1 / T2 Q1/Q2 = (67-35)/(75-35) = 32/40 = 80% A 20% savings. T in = 75 F T out = 35 F OR T in = 67 F

7
**The law of heat conduction**

Q loss / t = A T / R R is the R-value, which is a measure of the resistance to heat loss for a given material of given thickness. i.e. R fiberglass = 3.7 ft2-F-hr/Btu per inch. The higher R, the lower the heat loss. Example: A single pane of glass has R = 1 Q loss(glass)/Qloss(fiberglass) = (1/Rglass)/(1/Rfiber) = 3.7 X more loss.

8
**An insulated wall Air layers: In: R = .17 R = .68**

Insulating Sheathing: R = 2.06 Fiberglass: R = 11.0 Gypsum siding: R = .45 R total = 14.36 Air layers Fiber glass Gypsum siding Insulating Sheathing

9
Heating needs HDD = The length of the heating season, in days, times the average temperature difference HDD = 150 days (65 F – 35 F) = 4,500 Macomb has 6000 HDD Heating need per season: Qtotal = HDD (Area)(24 hrs/day) R An 8 x 20 foot wall with R = in Macomb. Q total = 6000 (160 ft^2)(24) / = 1.6 x 10^6 Btu/season. Natural Gas costs 40c per 1 x10^5 Btu, so $6.4 dollars burned to make up loss from that wall.

10
**Air infiltration Typical house exchanges air with outside every hour.**

Good insulation can reduce that to every 5 hours. Must have better air-purifying

11
**Lighting and Electrical use**

Fluorescent bulbs have 10 X longer lifetime, and use 15 W compared to 75W, representing an energy savings of 5 x, and a money savings of 50 x. Leaking electricity – Most appliances don’t turn fully off. Up to 5% of America’s use of electricity for “standby”mode.

Similar presentations

OK

How can I reduce my Carbon Footprint Chris Conlon Period 4.

How can I reduce my Carbon Footprint Chris Conlon Period 4.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on pollution in india free download Ppt on shell scripting interview Ppt on water conservation in hindi Ppt on different sectors of economy for class 10 A ppt on loch ness monster pictures Ppt on do's and don'ts of group discussion clip Ppt on area and perimeter for class 4 Ppt on c++ basic programing Ppt on stock exchange market Ppt on boilers operations coordinator