solar heat gain factor table

( Choosing a window frame material that does a fine job of insulating against thermal (heat) transference is one way to reduce the solar heat gain coefficient. 0000034811 00000 n 0000024598 00000 n The lower the 0000042224 00000 n 0000019574 00000 n >> Two cities along the Pacific northwest coast (Portland, Oregon; and Seattle). 0000036698 00000 n One quick note: It appears that you are assuming a SHGC of 0.5 for the heat gain calculations. /MediaBox [0.0 0.0 612.0 792.0] How Do I Reduce Or Eliminate Condensation? I think that the key design criteria for passive solar involves locating and sizing windows, thermal mass, and doing sufficient insulating and air-sealing so that only solar heat gain can provide most of the home's wintertime space heating, yet avoid summertime overheating. 0000018449 00000 n 0000057926 00000 n 0000010707 00000 n In Table 1, each city is listed with wintertime climate statistics. / Yet, the living room and the sun room, get a little bit more but welcome heat, while the bedrooms on the top floor facing west get a wallop in the afternoon. 0000020026 00000 n North windows would be most desirable in cooling-dominated climates, or during hot summer periods anywhere in the U.S. but not during the cold and darker winters of northern U.S. locations. 0000039316 00000 n 0000058589 00000 n 0000037411 00000 n If not, how can I find a better alternative at a reasonable price? ) 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 143 0 obj <> endobj Here's some information not included in the article that provides background to those unfamiliar with the topic raised by Malcolm. %3Qd Vw9k\1W7CL9tqM=~u5b&XfmFk!$"4c?9%fb|$N}0R16f]oqnDxo[hot;3Nq_fO-jldHA '*bIgdyfs[B[Z+^:E 9)Uii;/J PH( 6.u. w 0000023760 00000 n 0000027028 00000 n /Annots 26 0 R As such, the Energy Star Factors are as follows:Factors for Energy STAR Ratings in the South Central Climate Zone. 0000019489 00000 n Passive solar heat gains are more valuable in areas with higher costs for electricity or other heating fuels, or with occupants who are less affluent, or architects, owners, or builders more concerned with sustainable building. The higher the VT, the higher the The following web resources were useful for gathering climate and solar gain data. available solar energy falling on the window. Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat from the sun. Passive solar heat gain through large south-facing windows provided most of the winter space heating energy. The solar transmittance of a window glazing or window is the percentage of visible and near-infrared light that passes directly through a window. 0000052649 00000 n The sun rises in the east, goes overhead, then sets in the west, with little sunlight directly striking a south-facing wall or window. transmitted portion of the solar heat gain coefficient is given by:[4], T typically fall in a range between 0.1 and 0.3. Malcolm. 0000018030 00000 n Cities in the table are listed in descending order of their mid-winter solar heat gain. /ColorSpace 27 0 R 0000010630 00000 n I enjoyed the bright sunlight and warm interior temps mid-winter too. Davor, 0000010784 00000 n Note that south-facing windows typically have solar heat gains (column 3) at least double the heat losses (column 8). The amount of solar gain a space experiences is a function of the total incident solar irradianceand of the ability of any intervening material to transmitor resist the radiation. Gases are added between the layers of glazing to further increase insulation, the gases are heavier than air, making it less likely air will penetrate the glazing. >> 0000009155 00000 n But, how to deal with glare? The data on solar heat gains is summarized in Figure 2, below. Many more cities in the U.S., Canada, Europe, and elsewhere could be added to this list to compute comparative solar heating ease and value. "Do the math!". m Column 8 shows (with red negative numbers) the average January daily heat loss per square foot of glass (assuming glazing is rated R-5 or U=0.2, with window coverings adding some insulation during nighttime hours to attain U=0.15). 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 . Does The New Glass In Windows Need Any Special Care? [1] [5] The second factor is the CLF, or the cooling load factor. Beyond climate region, there are some other factors in place that impact how SHGC will affect your life. The SHGC of the shaded vertical fenestration in the proposed building is permitted to then be reduced by using the multipliers in Table 5.5.4.4.1 for each fenestration product. You bring up an important point. between 0 and 1. 0000032325 00000 n But hey nothing is perfect, so architects and builders could design roof overhangs to reduce summertime overheating. My great aunt used to live with family in Oregon, but had to live elsewhere during the overcast winters there. 0000050694 00000 n (My apologies if these assumptions are printed and I overlooked them.). Note that the majority of the total solar gain comes from the south-facing windows for all cities in January. There is more total sunlight shining in summer (June to August in the northern hemisphere) than mid-winter (December to February). As can be seen from the table, the top three rural family model types are Model 1, Model 2 and Model 3, accounting for 49%, 8% and 8%, respectively. Map. When designing a building, the solar heating potential can be computed. David, These cold sunny days the furnace rarely comes on all day long. SHGC is influenced by the color or tint of glass and its degree of reflectivity. 0000057378 00000 n 0000008169 00000 n We don't seem to have an issue with glare. Finally, Anchorage, Alaska, along the far northern Pacific coast, with by far the lowest solar heat gain. MIT Press, 1992. [13] When designed properly, this can modulate temperature fluctuations. Denver is the best location for wintertime daylighting, for using solar heat gain for space heating, and for PV. ( West-facing windows gain that heat in the afternoon, usually during the hottest time of the day, making west-facing windows particularly undesirable unless well shaded. 0000008432 00000 n << -- Buildings are considered "solar tempered" if they provide enough wintertime solar heat gain to keep the building's interior warm during sunny days. One of the best I've read here. So overhangs tend to keep the house cooler in the Spring as well as late summer. 0000054052 00000 n Try to design smaller and fewer west-facing windows. 0000044168 00000 n That's good for south-facing windows, because during the hot summer, you don't want the sun beating in your windows, causing solar heat gain in your home's interior. So I don't think glare around the dining table on the opposite side of the room would be much of a problem. E I bet under-insulating was also a common problem, especially for that thermal mass that serves as an overnight heating system. Remember, Window Joe and the staff at WindowReplacement.net are always here to answer any questions. 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. Column 7 shows the percentage of the total amount of solar gain that comes from the south-facing glazing. 0000018276 00000 n The challenge in selecting the appropriate SHGC is balancing out the ideal amount of incoming solar radiation in cold months (to heat your home from the sun's warmth and to lower heating bills), versus keeping solar heat out in hotter months of the year in order to save on air conditioning costs. The NFRC label can be found on all ENERGY STAR qualified window, door, and skylight products, but ENERGY STAR bases its qualification only on U-factor and solar heat gain coefficient ratings, which are described below. Fixed Clear . 2 (b)] /a; + a~ ` g=r+URI h +Ra;I (5) where T is the total transmittivity; UR is the overall heat loss coefficient of the window; aj, aare, respectively, the absorptivities of the inner and outer glasses; R is the heat resistance of the glazing; and ho is Visible transmittance (VT)is a fraction of the visible spectrum of sunlight (380 to 720 nanometers), weighted by the sensitivity of the human eye, that is transmitted through the glazing of a window, door, or skylight. /TT5 18 0 R 0000056953 00000 n The more you learn about energy efficiency in windows, the more you will be able to evaluate a quality window replacement installer. 0000059249 00000 n Next, six cities in the Midwest and Great Lakes area (Chicago; Indianapolis; Detroit; Burlington, Vermont; Pittsburgh, Pennsylvania; and Buffalo, N.Y.). 0000034904 00000 n I used Google Sketchup, the free version, to roughly model shadows on my soon to be built house. 0000014495 00000 n 0000055107 00000 n ( 0000036867 00000 n 0000040032 00000 n 0000024359 00000 n Heating Degree Days vary year-to-year, so other HDD numbers may be found. In the context of passive solar building design, the aim of the designer is normally to maximize solar gain within the building in the winter (to reduce space heating demand), and to control it in summer (to minimize cooling requirements).

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