Ultimate Guide to Power Efficiency
The Energy Rating (ER) is a useful measure of the overall heating season performance of a window in a typical dwelling. The ER considers heat loss due to transmission and air leakage, along with solar heat gain, averaged over north, south, east and west exposures. The ER may be positive or negative. A positive ER indicates that on average, the window gains more heat from incoming solar energy than it loses over the heating season. Most ER ratings for windows are negative, as can be seen in Figure 88. Many manufacturers quote thermal resistance values for the centre of glazing in their windows. This is always higher than the effective thermal resistance of the window when the effects of the edge seal and window frame are taken into account. Typical effective thermal resistance values are provided in Figure 88 in both imperial (R) and metric (RSI) units. Numerous studies on cost-effective energy efficiency R (RSI) Energy Rating Aluminum Frame Wood or Vinyl Fibreglass
Energy Efficient Lighting and Appliances Appliances and lighting represent a significant proportion of energy consumption in the typical household. Appropriate choices of appliances and lighting can cost effectively reduce the amount of energy con- A large number of electric lighting options are available, but these vary considerably in their energy efficiency. Fluorescent lighting is preferred where lighting will be used extensively. Compact fluorescent and energy saving fluorescent lamps are the most efficient alternatives. Natural light and passive solar heating are entirely compatible, arid represent cost-effective means of reducing energy consumption. Having made appropriate choices for appliances and lighting, recognize that the cleaning and maintenance of appliances, light fixtures and windows are important factors in realizing the full potential of these investments in energy efficiency.
Excessive areas of glazing should be avoided, as much more heat is lost through windows than through an equivalent area of insulated wall. Generally, a total glass area of about 12 percent of the floor area of the house is adequate. On the other hand, energy-efficient windows with unshaded southern exposure can contribute positively to the heating of the house, especially when combined with heavy drapes or insulated shutters that can be closed on cloudy days and at night. For thermal insulation, new high performance windows are available in most locations in Canada. Insulating glass units made of spaced sheets of glass are available for insertion in window sashes or frames. These windows with multiple glazings, selective coating and charged with argon or krypton can significantly reduce energy costs.
There are several important factors to consider when selecting windows and doors. The energy efficiency of doors, and particularly windows, is a critical consideration. These components can account for a high fraction of a dwelling's heat loss. It is important to consider the size and swing of exterior doors, not only to comply with building code requirements, but also to accommodate the easy movement of people and furnishings into and out of the dwelling. The size and style of windows should be carefully considered since this will
Condensation, a common homeowner complaint, can be reduced by installing good, energy efficient windows. Some condensation on windows is normal and should be expected, particularly around the edges of the glazing during cold weather. Nonetheless, multi-pane windows with thermally broken frames and good quality spacers can go a long way towards reducing the likelihood of condensation in today's houses.
However, wood doors have proven performance and a traditional appearance which has maintained their popularity in the marketplace. Irrespective of the style and appearance of the door, a number of common considerations are worth noting.
In the past, due to low energy prices, it was not common to completely fill wall stud spaces with insulation, or to insulate attics to a depth greater than that of the truss bottom chords or ceiling joists. Neither was it common to insulate foundation walls. Now, however, higher energy prices and our increasing realization of the need for energy conservation make it apparent that insulation should at least fill all available cavities within the building shell and that perhaps the shell construction should be altered to accommodate even more insulation. It has also become more apparent that uninsulated foundation walls are a major source of heat loss.
Your shop may have other wall-mounting areas you'd like to consider, but when searching for that perfect location, there are some other factors to keep in mind. For energy conservation (yours), hang the tool cabinet as close as possible to the place you'll be using most of the tools. In addition, make sure that the box won't block any window light when its doors arc fully opened. Also make sure that there is room to swing the cabinet doors flat against the wall (see the top drawing on the facing page). If swing-out doors pose a problem, you might want to build doors that disappear into the cabinet see the bottom drawing on the facing page for some suggestions.
The power plant for my sanding table is a used, 1 3-HP furnace blower, which provides just the right amount of power for a table this size. Heating contractors are good sources for used blowers or you can buy a new one (average cost 200) from a heating, ventilation and air-conditioning (HVAC) supplier.
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