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Types of Solar Gain
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In indirect solar gain, heat enters the building through an aperture and is captured and stored in a thermal mass. The mass then slowly and indi-
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FIGURE 5-13 Passive solar home addition
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rectly heats the building through conduction and convection. Isolated solar gain is a separate space, such as a sunroom, in which the solar energy is captured and then passively moved as heat through the living space by natural convection. A third type of solar gain, concentrated solar power (CSP), was reviewed in 3. While most applications are large commercial structures, consumers can use CSP water heaters in their homes. CSP is best in warm climates where sunlight is a constant and rainfall is low.
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Simple Improvements for Solar Gain
Every homeowner and renter can make simple home improvements to increase the passive solar energy available and used in the home. Keep-
Zero-Cost Passive Solar
Sun Light transmitted
Light reflected: albedo
Earth
Light absorbed
FIGURE 5-14 The albedo effect
http://www.energyeducation.tx.gov/environment/section_3/topics/predicting _change/img/albedo.gif
ing in mind the five elements required for passive solar, consider the following. The thermal mass in most homes is already in place and will not change. This solar storage will be a floor or wall. The larger and more dense the mass, the more heat storage is available. You can also change the color to absorb more heat energy. For most homes, the aperture is in the form of windows or skylights, and the control will be some type of shade.
Heat and Light Transfer Through Windows The solar heat gain coefficient (SHGC), shown in Figure 5-15, refers to the percentage of solar radiation that passes through a window and is expressed in a value of 0 or 1. The higher the SHGC, the more solar gain in the home. The visible light transmission (VT), shown in Figure 5-16, refers to the amount of light transmitted through a window and is also measured by values between 0 and 1. A window with a VT of 1 will allow no loss of
Five
House
FIGURE 5-15 Solar heat gain coefficient
http://www.energycodes.gov/training/res_wbt/images/shgc_house.jpg
W i Sun Visible light Invisible solar heat n d o w
FIGURE 5-16 Visible light transmission
http://eetd.lbl.gov/lab2mkt/images/spectral-glazing-t.gif
transmission. The use of a second pane of glass or a coating will lower the VT value. Low-E coatings, which stands for low emissivity, refers to the relative ability of a surface to emit energy by radiation. A Low-E coating for windows refers to a thin metallic or metallic oxide layer deposited on one of the glass surfaces (Figure 5-17). Heat gained or lost through a window is due to radiation from either outside-in or inside-out. The coating reflects a portion of the radiation, reducing heat flow through the window. The coating is normally invisible to the homeowner. Low-E is also rated on a scale of 0 to 1. A black object would have an emissivity of 1, absorbing all light, and a perfect reflector would have a value of 0.
Zero-Cost Passive Solar
Outside Inside Transparent low-emissivity coating
Glass panes
Air or gas-filled space
Heat flow: radiation
Heat flow: conduction
Heat flow: convection
no. 1 no. 2
no. 3 no. 4
FIGURE 5-17 Low-E window coatings
http://pag.lbl.gov/images/Low-E%20window.jpg
A single-pane window is a single sheet of glass with no coatings (Figure 5-18). Single-pane windows are energy inefficient, but in the last 30 years, dual-pane and triple-pane windows have become popular due to their increased efficiency at restricting the transfer of heat. The U-value gauges how well a window conducts heat and is more correctly called the overall heat transfer coefficient. It measures the rate of heat transfer through a window (Figure 5-19). A window s U-value is rated under standardized conditions. The usual standard is at a temperature gradient of 75 F, at 50-percent humidity, with no wind. The lower the U-value, the less heat transfer occurs, and the more energy-efficient the window is considered to be. Here are examples of typical window performance: A single-pane window has an average U-value of 1.1 or greater. A dual-pane window has an average U-value of 0.55 or lower. A triple-pane window has an average U-value as low as 0.20. In addition to the glass, the window frame, which is included in the U-value, must be designed for performance (Figure 5-20).
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