solar heat gain factor table

>> (12) Consider different glazing for windows facing different directions. The answer to this question depends on where you live. 0000027305 00000 n /TT0 23 0 R Similar to U-Factor, the lower the SHGC, the lower the radiant heat transmitting through the window. (Plus the low utility bills and resilience in case of power outages.). 0000011477 00000 n It's free and doesn't require a download. 0000027129 00000 n Other internet data sources may include somewhat different data, but the patterns of data would lead to similar conclusions. 0000036017 00000 n 0000034107 00000 n Vertical fenestration that is located on the street side of the street-level story only, provided that. We do have medium dark wood floors, linoleum and tile. The other climate zones underwent more stringent Energy Star qualifications that took effect on January 1, 2015. The reason Energy STAR, from the U.S. Department of Energy, designates four climate zones is to help make it easier for homeowners to know which new house windows will work in their climate. The lower the SHGC, the better a product is at blocking unwanted heat gain. T Optimizing heat gain In Table 6, note that light from west or east facing windows in summer, is about the same as south-facing windows mid-winter. 0000050694 00000 n Latitude: N: NE: E: SE: S: SW: W: NW: HORIZONTAL : 24 o N: 42: 37: 36: 26: 15: 95: 174: 134: 162: 25 o N: 41 . Light-to-solar gain (LSG)is the ratio between the VT and SHGC. http://www.cardinalcorp.com/products/coated-glass/loe-180-glass/, PPG Industries manufactures two low-e/high SHGC products: Sungate 500 and Sungate 100 window glass with SHGC of about 0.7. Vinyl windows are generally made of one continuous piece. Column 7 shows the percentage of the total amount of solar gain that comes from the south-facing glazing. Solar Heat Gain through Glass Internal Heat Gains from People, Lights, and Equipment ASHRAE Zones for Solar Cooling Load (SCL) Factors for Glass are based on: Floor Level and Room Location Single Story Building (Table 8.8-A) Top Floor (Table 8.8-B) First / Ground Floor (Table 8.8-C) Middle Floor (Table 8.8-D) Interior Rooms (Table 8.8-E) UA Table = (U-factor from Table C402.1.4 or C402.4) x Area B = Sum of the (FL Dif) values for each distinct slab on grade perimeter condition of the building thermal . 0000046541 00000 n 0000053952 00000 n (The result also is divided by 10 million so that numbers are transformed into the single digit range.). 0000059851 00000 n In the summer, that afternoon heat gain typically is undesirable. If you were to draw a Dec 21st shading line for the top of the window, then draw a shading line for June 21st from the bottom of the window, the point of intersection could be used to set the lowest, farthest out point of the roof overhang. trailer I'm old enough to remember the passive solar homes of the 1970s and 1980s. = Even for east- and west-facing windows, losses exceeded solar heat gains except for Denver. This shows that a good percentage of the gains from south windows are retained, despite losses, except in Anchorage, Alaska. 0000023760 00000 n Industry technical experts recognized the limitations of SC and pushed towards SHGC in the United States (and the analogous g-value in Europe) before the early 1990s. Solar Heat Gain Factors (SHGF) for June/July at 4 p.m. 0000050787 00000 n 0000014163 00000 n 0000028440 00000 n = (14) Exploit sustainable solar heating to lower the buildings heat load, utility bills, and supplementary space heating systems. But if you really don't want to move your TV and have glare issues, besides curtains or shades, you could use other ways to block light from reflecting off your TV screen or creating too much glare competing with the TV in your viewing direction. A new, affordable but well-insulated window (with cellular blinds used at night) would attain values similar to those listed in the table. Grid Type . 0000012239 00000 n product blocks heat from the sun. Locations in the northern U.S. are winter-heating-dominated (meaning that more energy is needed for winter heating and much less for summer cooling). 0000049715 00000 n The lower the number, the less you'll spend on cooling. 0000051079 00000 n Table 6 lists the BTUs per square foot of window glass per day for Providence, R.I. (the northeastern coastal city that looks most promising for solar heating). They have been prepared in exactly the same way as the tables in the ASHRAE Handbook of Fundamentals (1967), but are for the latitudes of particular relevance in Canada and for . Not sure when I took the photo, other than it shows AM shadows, and not during winter, as the deciduous plants had their leaves. 0000024478 00000 n So the solar heat gain analysis has focused on the coldest month (January) for the 22 northern U.S. locations. transmitted portion of the solar heat gain coefficient is given by:[4], T 0000044168 00000 n Modeling thermal mass performance seems difficult or approximate. Table 2 lists solar gain data for the 22 northern U.S. cities. One shading method is to have roof overhangs stick out above the south-facing walls enough that they cast shade on south-facing windows in late August. << 0000028760 00000 n Solar heat gain coefficient (SHGC) is the fraction of solar radiation admitted through a window, door, or skylight -- either transmitted directly and/or absorbed, and subsequently released as heat inside a home. Having lots of sunlight entering the home in the winter is a way to elevate mood when many folks find it hard to be outside like when it's warm. 0000029981 00000 n The question-and-answer article below paraphrases, quotes-from, updates, and comments an original article from Solar Age Magazine and written by Steven Bliss. 0.83 0.73 0.73 . The lower the U-Factor, the better the window insulates. include it on their labels. (8) Unobstructed west-facing windows produce heat gains mostly in the afternoon. Columns 1-3 lists the same city data, in the same order, as Table 1. The larger the roof overhang, the more important it is to do shading analysis, as it makes a big difference in the size of the shadow. Solar heat gain factors and heat loss coefficients for passive heating concepts Full Record Research Abstract The concept of solar heat gain factor has been introduced for calculating the net energy gain of passive heating elements and other components of a building as a result of incident solar radiation. qog7/f8S0f|+Ca(zS{ /IQW:8p=~cn7y 8,+!H6*"rd%oBT$DY^V7E aO/CZMI>*V2hxErMQX{fNFE DnAb 0 b +{roFw@Qv.Pb=Z"3>!06&rhS8EnVw\/bw +rt|bSL6),W=^O *cAL^u'MH} ^D;p.'*{6OQYbS2tAD2)T=z 0!"Tl,|Am5q/Up+XwNM7}!/;yy6Q@=vjI~}krN>+e_CC-ccB: p7B . You must be a magazine subscriber to access this feature. Maybe we should not let the perfect be the enemy of the good. available solar energy falling on the window. n Solar heat gain coefficient or SHGC primarily reflects the percentage of solar radiation or sunlight admitted through a door, skylight, or a window, either directly or absorbed, only to release a fraction of heat inside the house to keep it warm. One of the best I've read here. 0000043781 00000 n The lack of joints in vinyl windows increases their energy efficiency and reduces their solar heat gain coefficient because there are not any joints for heat to travel through. You can use the energy performance ratings of windows, doors, and skylights to understand their potential for gaining and losing heat, as well as bringing sunlight into your home. [11] Materials with high SRI will reflect and emit a majority of heat energy, keeping them cooler than other exterior finishes. Glare Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. [3] Since the quantities compared are functions of both wavelength and angle of incidence, the shading coefficient for a window assembly is typically reported for a single wavelength typical of solar radiation entering normal to the plane of glass. Solar gain can have both positive or negative effects depending on the climate. In a room, its likely you have light coming from multiple windows on different sides of the home. 0000040162 00000 n 0000039534 00000 n It is easier to maximize wintertime solar heating in some climates than others. Those won't work very well for passive solar homes. You might find a double or triple pane sealed insulated glass unit (IGU) with no "heat mirror" low-e treatment on any of the panes, or rare low-e treatments that don't reduce solar gain as much. From this ordering of cities by average mid-winter solar heat gain potential, we may begin to conclude: Next, we need to explore solar heat gains and losses in more detail for each metro area. 0000000016 00000 n 4. The glass on the TV or computer screen can also be highly reflective smooth glass for best visual screen performance, or can be less reflective glass for less interference with reflections on the screen. typically fall in a range between 0.1 and 0.3. 0000052561 00000 n An interesting result: It turns out that when these cities are ordered by average solar heat gain, they happen to be ordered somewhat by geographic areas: This geographic ordering is illustrated in the map in Figure 1. The solar heat gain coefficient (SHGC) is an index describing the proportion of light that is let through a window. The lower the U-factor, the more energy-efficient the window, door, or skylight. In essence SC is an index of the effective solar rejection performance of a given glass type. 0000037304 00000 n The list of 22 northern U.S. cities can be re-ordered by the two indices for the ease of heating by solar gains and the value of solar heating. Solar transmittance is used to compare different types of glass. Only one image can be added per comment but you can post as many comments, and therefore images, as you like. 0000054676 00000 n You wouldn't be able to see the TV well, and would experience glare from the window. We designed it to be in east west direction, and on the south side we have a large 2.5m wide doors. Sustainable By Design by Christopher Gronbeck. The U-factor, Solar Heat Gain Coefficient (SHGC), Visible Light Transmit-tance (VT), and air leakage rate for all manufactured fenestra-tion products shall be determined by a laboratory accredited by a nationally recognized accreditation organization, such as the National Fenestration Rating Council. T Adjustable awnings, curtains, window shades, exterior shutters, or even deciduous trees, or other shading methods, can provide more flexible and more complete shading than a fixed roof overhang. Much of the population of northern U.S. live in or near these metropolitan areas. Low-E Type . 0000059089 00000 n Table 2 shows the amount of solar heat gain per square foot of window glass for the cities listed previously. The larger the net solar gains, and the smaller the winter heating needed, the better the score on the index. Remember, the solar heat gain coefficient ranges between 0 and 1, the lower the number the less heat (radiation) is let in, the higher the SHGC, the more heat is let in. m 0000047854 00000 n I'm less familiar with these lighting issues, so hope someone else can chime in. As such, the Energy Star Factors are as follows:Factors for Energy STAR Ratings in the South Central Climate Zone. Two cities along the Pacific northwest coast (Portland, Oregon; and Seattle). 0000048563 00000 n The VT you need for a window, door, or skylight should be determined by your home's daylighting requirements and/or whether you need to reduce interior glare in a space. /Length 2106 endstream endobj 644 0 obj<> endobj 646 0 obj[647 0 R] endobj 647 0 obj<>>> endobj 648 0 obj<> endobj 649 0 obj<> endobj 650 0 obj<> endobj 651 0 obj<> endobj 652 0 obj<> endobj 653 0 obj<> endobj 654 0 obj<> endobj 655 0 obj<> endobj 656 0 obj<> endobj 657 0 obj<> endobj 658 0 obj<> endobj 659 0 obj<> endobj 660 0 obj<> endobj 661 0 obj<> endobj 662 0 obj<> endobj 663 0 obj<> endobj 664 0 obj<> endobj 665 0 obj<> endobj 666 0 obj<> endobj 667 0 obj<> endobj 668 0 obj<> endobj 669 0 obj<> endobj 670 0 obj<> endobj 671 0 obj<> endobj 672 0 obj<> endobj 673 0 obj<> endobj 674 0 obj<> endobj 675 0 obj<> endobj 676 0 obj<> endobj 677 0 obj<> endobj 678 0 obj<> endobj 679 0 obj<> endobj 680 0 obj<> endobj 681 0 obj<> endobj 682 0 obj<> endobj 683 0 obj<> endobj 684 0 obj<> endobj 685 0 obj<> endobj 686 0 obj<> endobj 687 0 obj<> endobj 688 0 obj<> endobj 689 0 obj<> endobj 690 0 obj<> endobj 691 0 obj<> endobj 692 0 obj<> endobj 693 0 obj<> endobj 694 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 695 0 obj<> endobj 696 0 obj<> endobj 697 0 obj<> endobj 698 0 obj<> endobj 699 0 obj<> endobj 700 0 obj<>stream Solar gain(also known as solar heat gainor passive solar gain) is the increase in thermal energy of a space, object or structure as it absorbs incident solar radiation. 0000053260 00000 n ) The data on solar heat gains is summarized in Figure 2, below. All you need to do is look for the ratings that indicate a good fit for your climate. 0000020109 00000 n Here, is the wavelength of radiation and is the angle of incidence. 0000047504 00000 n 0000007296 00000 n Blocking solar /C2_2 13 0 R ( /GS2 4 0 R There are a couple of ways that glass can maintain the indoor temperatures to keep you comfortable indoors. 0000056639 00000 n /GS1 5 0 R [13] When designed properly, this can modulate temperature fluctuations. (7) East-facing windows provide sunlight early in the morning when a house interior is the coolest, so they are more useful than west-facing windows. CCPA | 0000041950 00000 n 0000054052 00000 n Note from the cells highlighted in yellow: During the winter, from November through February, one south-facing window would produce more light and solar heat gain than the total gain of three windows facing north, east, and west, respectively. 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