ENSC 1005 Lecture Notes - Passive Solar Building Design, Energy Conversion Devices, Energy Returned On Energy Invested
31 Mar 2013
School
Department
Course
Professor
Document Summary
Future direction of energy use in u. s. will impact canadians from an economic and an environmental perspective. Net energy total amount of useful energy available over lifetime of resources minus the amount of energy needed to make it available for use. Can also be looked at as a ratio of useful energy: useful energy to produce it the higher the ratio, the greater the net energy, if ration < 1 there is net energy loss (fig. Canada has the worlds second largest crude oil reserves. Burning it produces air pollution and releases the greenhouse gas co2. Causes thermal water pollution when water is recycled and can have extreme environmental impact if there is a major accident. Highly radioactive wastes must be safely stored for thousands of years. Energy efficiency - 84% of energy used in canada is wasted (41% due to the 2nd law of thermodynamics and 43% unnecessarily wasted because of poorly insulated buildings, fuel-wasting motor vehicles, furnaces)
