It was an experiment, and I can now, after 5 years, say it exceeded my expectations. E Extending them would have an effect on the top of the window but not extend very far down the window. This is quite significant in the design of roofs since dark roofing materials can often be as much as 50 C hotter than the surrounding air temperature, leading to large thermal stresses as well as heat transfer to interior space.[5]. SHGC ratings are used to help in quantifying the energy efficiency of windows and skylights. 0000043411 00000 n Solar heat gain (SHG) describes the way radiation from the sun is turned into heat. 0000010322 00000 n ) 0000025712 00000 n The smaller amount of heating needed for space heating in high-performance homes makes more costly or elaborate heating systems no longer cost-effective or necessary. Like Cardinal, PPG only manufactures window glass, and I don't think sell glass units retail, just to window manufacturers. 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. 0000053637 00000 n Operable Tinted /CropBox [0.0 0.0 612.0 792.0] 0000009779 00000 n Beyond climate region, there are some other factors in place that impact how SHGC will affect your life. To perform an approximate conversion from SC to SHGC, multiply the SC value by 0.87. In climate-responsive design for cold and mixed climates, windows are typically sized and positioned in order to provide solar heat gains during the heating season. December 21st there is no shading from overhangs. 0000022755 00000 n 0000009077 00000 n We would agree heat loss and solar gain calculations should be done to optimize any home design. /Fm0 11 0 R Thanks for your comments. 0000050604 00000 n Thank you so much for sharing Fy(@k ,dKa`C]Ll*EWXhS Q(summer) = U*A*(CLTD) using the CLTD method. YZR$%s)Gp9y} X<~ea A product with a high SHGC rating is more effective at collecting solar heat during the winter. 0000024359 00000 n /Properties 0000051944 00000 n 0000057247 00000 n (2005 ASHRAE Handbook : Fundamentals at Amazon). 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. It can range in value The solar heat gain coefficient (SHGC) is an index describing the proportion of light that is let through a window. 0000024478 00000 n 0000029050 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. We have a passive solar house we designed and built ourselves in SE Michigan in the late 80's. The complete source for building, designing, and remodeling green homes. product blocks heat from the sun. Hours earlier and later, the light could extend further but would be less intense. This article explores the viability of passive solar and solar-tempered space heating in northern U.S. regions and metro areas. 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. Those principles work in all types of buildings, and unfortunately can be ignored in subdivision design, building design, and building orientation. Ive been under the impression that south facing super insulated walls are more efficient in the winter, than the solar gain potential if replaced by windows. This is also hugely effective. In June, the sun is closer to overhead at noon, so south windows have far less solar heat gain. 0000058589 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. 0000019003 00000 n 0000030709 00000 n /CS0 8 0 R "Rjk=6}TIF }l,MHU{j>k(g_VqL14VToD_fvCF O=^&~]D;_"?/4M$gi3c'fL12#PK6eSvIP9@CLG[4fmRKn#Ga'kenD1pM8|b,yZMwtxxvr;PI})1Z8ruT^a{ZANQ XHXM!zwR`OqQzq/y[moWk&jaR6vl_3=OM sK}GJNU 7vd+`y`,Sk- Shading Coefficient (SC) SHADING COEFFICIENT (SC) is the ratio of the solar heat gain through a fenestration product to the solar heat gain through an unshaded 1/8-inch-thick clear double strength glass under the same set of conditions. The maximum allowable fenestration U-factors in Table R402.1.2 (for the prescriptive compliance path) for climates zones 3 through 8 have been reduced from the values in the 2015 edition. . Designing roof overhangs to avoid shading windows at noon on Dec 21st results in some shading at the top of the window at noon in January, February and November, when you still want that sunlight (though at 10AM or 2PM you won't be shading the top of the window since the sun is lower on the horizon at that time of day). 165 0 obj <>stream The most important factors are budget and energy efficiency. 0000056381 00000 n >> And it would shade some of the top of the window during January, February and November, when you'd prefer full sun. << %YYgeG&1'd$`0l sLqk>0h&b{g.\)o>KC\#F[T(Al'd X There are lots of ways to provide that shading, or using low SHGC windows for west and east-facing windows to avoid interior overheating during the summer. Passive Solar Buildings. 0000009155 00000 n Its likely that if the floors were a dark color, the house would have performed slightly better, but glare likely would been a much greater problem. /Type /Page 0000054894 00000 n /TT3 20 0 R My house is orientated 45* off south, with a large wall (38') with 4 large-ish windows orientated south-west, and 2 largish windows orientated south-east. T Taking account of heat losses from the windows produces much more extreme results favoring south-facing glazing. Traditional metal windows allow heat to transfer along the metal into the home, so if you live in a hot climate region, metal isn't a great choice for your replacement window frame. 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 . 0000028911 00000 n 0000053548 00000 n Consequently, south-facing windows capture far more light, and thereby produce far more solar heat gain, than windows facing other directions. To maximize wintertime interior daylighting and solar heat gains, south windows should be larger in size or in number than windows facing other directions. Great article! Fortunately, these days, thermal breaks which are small pieces of plastic, are built into the window frame, to "break" the conductivity, and therefore do a better job of insulating by disrupting the heat transfer through the frame material. 0000036017 00000 n Figure 1 depicts the grouping of northern U.S. cities by solar heating potential, as listed in Table 1. 0000051730 00000 n Simple 2x6 with exterior 1" aluminium skinned polyiso foam, south facing rear with larger windows and doors, few windows on other walls. >> HUrF}WoND{_2#J$v:>-%uE">Tw[~Aq}$,N.7n@0v]Av8`o 0000053260 00000 n It quantifies how some US climates (and not others) can use solar heat gain for space heating, or reduce utility bills cost-effectively, by designing to manage solar heat gain. Your home and the Colorado passive solar house I designed and built seem quite similar in construction. 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. In the hotter summer season, solar heat gain through windows is usually undesirable. It is important to note that the standard SHGC is calculated only for an angle of incidence normal to the window. At the bottom, Anchorage is the only city that has average net heat losses through south-facing windows. ASHRAEs table of solar heat gain factors[2] provides the expected solar heat gain for clear float glass at different latitudes, orientations, and times, which can be multiplied by the shading coefficient to correct for differences in radiation properties. 0000050037 00000 n In this example, of the window is covered with the venetian blind and is not; therefore, the solar heat gain factor equals of the overall factor + of the glass factor. 0000047980 00000 n 0000036575 00000 n 0000022887 00000 n Table 4 only looks at solar heat gains without considering losses. ) 0000022979 00000 n on the climate, summer and winter fuels costs, and 0000023176 00000 n What Are The Top Factors To Consider In New Windows? This feature has been temporarily disabled during the beta site preview. 5. 0000053085 00000 n << 0000035419 00000 n 0000023459 00000 n 0000031018 00000 n However this tends to provide a good estimate over a wide range of angles, up to 30 degrees from normal in most cases.[3]. He was a psychology professor for five years, and a software and web site usability and design engineer for 20 years. Rather than looking for a window with a high U-factor, you should be looking for a window with low U-factor. The lower the U-Factor, the better the window insulates. I'm less familiar with these lighting issues, so hope someone else can chime in. Try to design smaller and fewer west-facing windows. How do you optimize this shading in a more so sophisticated way that the common arc diagram? 0000055107 00000 n Passive solar designs typically employ large south facing windows with a high SHGC and overhangs that block sunlight in summer months and permit it to enter the window in the winter. It differs from active solar heating which uses exterior water tanks with pumps to absorb solar energy because passive solar systems do not require energy for pumping and store heat directly in structures and finishes of occupied space.[12]. You want to shade your south-facing windows from the sun to avoid solar heat gain. 0000040162 00000 n 154 0 obj <>/Filter/FlateDecode/ID[<7A4022D89D0845C14B1934A88527FBA7><3CC1F5B57CF1284BA9D476A461DF3FBB>]/Index[143 23]/Info 142 0 R/Length 76/Prev 918310/Root 144 0 R/Size 166/Type/XRef/W[1 3 1]>>stream They can work well in late summer hot weather, yet not block the sun on cooler days in the Spring. 0000035750 00000 n http://www.vitrowindowglass.com/lowe_glass/sungate_500.aspx. If your climate zone experiences many cold days, the sun's warmth, also referred to as the sun's radiation, is welcome because it allows the heat from the sun into your home. h)u^Si!vr:(q;}xH)\@|&u$y?Cm_Sk5a4iiARd(q-tc:Ng^*,,eH%Gk(SX~w X%l0As6_L t 5i f5=P8E UUn vmSfoB`F(a\N`! w]T,&hX#XXJ Xo7Jj%I:hL$^B;4DC{=.! In buildings, excessive solar gain can lead to overheating within a space, but it can also be used as a passive heating strategy when heat is desired.[1]. Depending on how many changes a manufacturer had to make, it could have greatly impacted the retail price of your window replacement installation. 0000011169 00000 n Other internet data sources may include somewhat different data, but the patterns of data would lead to similar conclusions. In practice though, most g-values will range between 0.2 and 0.7, with solar control glazing having a g-value of less than 0.5. The NFRC label provides a reliable way to determine a window's energy properties and to compare products. 0000032325 00000 n 0000058680 00000 n /BleedBox [0.0 0.0 612.0 792.0] But solar transmittance does not include the solar heat that the glass absorbs and re-radiates into the building, so alone it is not accurate enough for calculating total solar gains through windows. It is easier to maximize wintertime solar heating in some climates than others. 0000019232 00000 n 0000018030 00000 n /GS0 3 0 R Basically, any window frame material is going to insulate well whether it is wood, vinyl, aluminum clad wood, or fiberglass. 0000018740 00000 n During the summer months, the path of the sun has changed. Vinyl replacement windows, those with a vinyl window frame, are a great economic choice and also provide great energy efficiency for your home, lowering bills. Home | A U-factor of U-0.24 isn't bad, by the way. To that end, glazing with a relatively high solar heat gain coefficient is often used so as not to block solar heat gains, especially in the sunny side of the house. 0000031116 00000 n 0000010861 00000 n David, Otherwise, the ordering remains similar to the previous ordering by amount of solar heat gain from south windows (Tables 1 through 3). So I'd recommend designing overhangs for minimal shading mid-winter, and not worry so much about summer (for winter-dominated northern climates). I changed the color of walls from off-white to the same coffee color (from advice in an interior design class). >> (8) Unobstructed west-facing windows produce heat gains mostly in the afternoon. This raises the question: Could a passive solar home be built successfully and cost-effectively in other cold, northern climates climates more challenging than the sunny but cold climate of the Rocky Mountain Front Range? 0000030815 00000 n Window Joe says to always keep it simple and follow NFRC and Energy STAR ratings that are suggested for your specific county. How to calculate solar gain for a building: This article discusses the method for calculating solar heat gain through windows. Designing south-facing roof overhangs 0000053952 00000 n 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. Cities in the table are listed in descending order of their mid-winter solar heat gain. Does one use visible light transmission or some other figure? Objects struck by sunlight absorb its visible and short-wave infrared components, increase in temperature, and then re-radiate that heat at longer infrared wavelengths. 0000053347 00000 n 0000025618 00000 n 0000022215 00000 n Air leakage is the rate of air movement around a window, door, or skylight in the presence of a specific pressure difference across it. Same for east or west-facing windows, early or late in the day, respectively. 0000032660 00000 n While the U-Factor can take any value, in general for windows it ranges from 0.20 to 1.20. Should I be satisfied with a U of 0.24 and SHGC of 0.39? Robert >> 0000020109 00000 n 0000021316 00000 n It is defined as the ratio of solar radiation at a given wavelength and angle of incidence passing through a glass unit to the radiation that would pass through a reference window of frameless 3 millimetres (0.12in) Clear Float Glass. n endstream endobj startxref A product with a low air leakage rating is tighter than one with a high air leakage rating. /BitsPerComponent 8 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. 0000031802 00000 n I plan to say more about designing passive solar homes effectively in a future blog. So you could have a solar-tempered interior with tile or wood floors over wood frame construction, but not fully passive solar, unless you also have other significant thermal mass elsewhere. 0000046682 00000 n Watch out: other very important factors need to be considered in arriving at an accurate picture of solar heat gain through windows. = / /GS2 4 0 R On the flip side that means that cold air would normally go from outdoors to indoors with metal framed windows. 0000010630 00000 n I think glare would be a bigger problem if you were sitting in direct sunlight, not at the other end of the room. Kansas City and cities along the northeast coast also look promising for wintertime daylighting, space heating, and PV. 0000023760 00000 n qog7/f8S0f|+Ca(zS{ /IQW:8p=~cn7y 8,+!H6*"rd%oBT$DY^V7E aO/CZMI>*V2hxErMQX{fNFE DnAb =J04pajo/7iv}F1&04 kkAVF/n0 Conversely, if your are trying to keep your home cool in a hot climate, adding the intensity of the sun's warmth could create a suffocating situation, particularly if the energy is trapped inside by an incorrect u factor. 0000023641 00000 n ) I'm not so sure about small windows of a dark passive house that is currently expensive to build, even if you can find someone who can do the work right, but the very low energy use is great. You must be a magazine subscriber to access this feature. Though transparent building materials such as glass allow visible light to pass through almost unimpeded, once that light is converted to long-wave infrared radiation by materials indoors, it is unable to escape back through the window since glass is opaque to those longer wavelengths. The SHGC is the measurement of how much radiant heat, or heat produced by the sun, comes in through a window. [3] The transmittance of each component is calculated in a similar manner to the shading coefficient. 0000011015 00000 n Use ASHRAE table 8.5, page 8.26 (page 26 note) to . Two cities along the Pacific northwest coast (Portland, Oregon; and Seattle). m Overall, it is best to take your time, build your knowledge, and scrutinize each portion of the process and product when choosing new replacement windows. A product with a higher VT transmits more visible light. The answer to this question depends on where you live. Seattle, Washington. Despite having minor differences in modeling standards compared to the SHGC, the two values are effectively the same. 0000060877 00000 n We have about 2' overhangs on all south facing windows and doors which work well in this latitude. So if you have your heart set on high-solar-gain glazing, you should keep looking. Solar Heat Gain through Fenestration Systems Containing Shading: Summary of Procedures for Estimating Performance from Minimal Data Publication Type Conference Paper Authors Joseph H Klems LBNL Report Number LBNL-48672 Abstract Avoiding south-facing windows because in rare cases people created window walls without considering the solar gain or glare impact would be a mistake. 0000021721 00000 n 0000034904 00000 n 0000042713 00000 n 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. I did heat loss, air infiltration, solar gain, and hourly interior temperature calculations for the home pictured (using pencil and paper, before the days when home computers were available). 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. Contrast between the direct sunlight and the TV screen needs to be avoided. I saw that a lot: first, the designer included too much south-facing glazing; then the homeowners installed interior shades to cut down on the glare. 0000013076 00000 n What about glare? Solar transmittance is used to compare different types of glass. 0000034369 00000 n 2225 0 obj <> endobj 0000028135 00000 n /MediaBox [0.0 0.0 612.0 792.0] 0000021134 00000 n See Table 6 for details. 0000035843 00000 n is the incident solar spectral irradiance. What Is Solar Heat Gain Coefficient? The lower the SHGC, the less solar heat it transmits and the greater its shading ability. Solar gain can have both positive or negative effects depending on the climate. T AL, the better a product is at keeping air out. 0000023549 00000 n We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. 2252 0 obj <>/Filter/FlateDecode/ID[<83C04542AF040F4C833A7DC507AC7EE9><9975C82B1E27C340964B5370330FFFE6>]/Index[2225 55]/Info 2224 0 R/Length 124/Prev 708226/Root 2226 0 R/Size 2280/Type/XRef/W[1 3 1]>>stream 0000052240 00000 n Some of the current research into this subject area is addressing the tradeoff between opaque thermal mass for storage and transparent glazing for collection through the use of transparent phase change materials that both admit light and store energy without the need for excessive weight.[14]. 0000023337 00000 n In essence SC is an index of the effective solar rejection performance of a given glass type. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. These tables give the solar data needed for designing an air conditioning system by either the traditional hand- calculating procedures or digital computer techniques. 0000039316 00000 n Shades, overhangs, or many other alternatives can be used to cut down on solar heat gain during hot days in any type of home, to reduce AC or uncomfortable interior temps. The NFRC (National Fenestration Council) describes Solar Heat Gain Coefficient (SHGC) as: Solar Heat Gain Coefficient(SHGC) measures how well a Again, it would reflect off the floor and other surfaces to diffuse the light. 0000039059 00000 n The window projection factor shall be . include it on their labels. 0000037304 00000 n Labels on products sold in markets outside the United The other two factors related toSolar Heat Gain Coefficient when choosing replacement windows are: Window Joe went to look at a home recently that required different solar heat gain coefficients based on the two factors above. Solar Heat Gain Factors (SHGFs) for selected latitudes of the Northern Hemisphere Source: Handbook of Fundamentals American Society of Heating, Refrigeration and Air-Conditioning (ASHRAE) Use: Select latitude (16o-64oN) month of year (January-December) and orientation of exposure (North, East, South, West or intermediate orientation). is the spectral transmittance at a given wavelength in nanometers and For those trying to figure out directions and overhang sizes and angles, the best tool is the Solar Pathfinder and many new apps like that which show all angles and azimuths of the sun for any location throughout every day of the year. But it might be a good compromise. [4] Factors such as color, tint, and reflective coatings affect these properties, which is what prompted the development of the shading coefficient as a correction factor to account for this. Remember, Window Joe and the staff at WindowReplacement.net are always here to answer any questions. ) I used this website to analyze my site. Denver is the best location for wintertime daylighting, for using solar heat gain for space heating, and for PV. For more information, see All About Glazing Options. A new, affordable but well-insulated window (with cellular blinds used at night) would attain values similar to those listed in the table. 0000021621 00000 n Table 2 lists solar gain data for the 22 northern U.S. cities. 0000030116 00000 n That would provide ideal sun shading for those dates at solar noon. Solar gain (also known as solar heat gain or passive solar gain) is the increase in thermal energy of a space, object or structure as it absorbs incident solar radiation. ;"\ h;; nM"O*]\_n}s54xBb;L";`fJq=.s5?puuus9Eq=7wWT|# LhH{\=vf}+W8?fX'Xgp8=ZHQ-oGA2mN~~k. 0000031405 00000 n East-facing windows can be more useful on winter mornings to warm up a cold house, but are quickly overtaken by warming from south-facing windows. 0000046325 00000 n CCPA | 0000008765 00000 n This may help break up the glare. 0000034610 00000 n At the bottom of the table, the yearly gains are totaled for south-, north-, east-, and west-facing windows. 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. But it would not shade the window as much as you'd like by late August, or earlier or later during the day on June 21st, as you point out. ( This label displays AL in U.S. units. Glare /TT6 17 0 R /Metadata 9 0 R The home is a three story house, with a basement comprising the bottom floor. 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. {\displaystyle E(\lambda )} 0000012144 00000 n 2 0 obj Malcolm. /Resources 0000038796 00000 n /GS1 5 0 R Passive solar design is a key element of creating resilient homes, Cold-climate glazing is surprisingly hard to find. 0000031652 00000 n 0000044828 00000 n Long stretches of overcast days produce large heat losses through large windows, with minimal solar heat gains to compensate. 0000040032 00000 n Is this correct? 3500 0000054676 00000 n 0000044552 00000 n This Solar Value Index uses south window glazing net BTUs of heat per day per square foot of glazing, and multiplies by the Heating Degree Days and by the price of electricity. Not sure when I took the photo, other than it shows AM shadows, and not during winter, as the deciduous plants had their leaves. Again, the northeastern coastal cities look promising for using solar heat gains for wintertime space heating. Maybe some desiccant packets could help reduce fogging? We have no relationship with advertisers, products, or services discussed at this website. The higher its solar transmittance or solar heat gain coefficient, the better a glazing is for solar heating use. 0000024834 00000 n The U-Factor measures how well the window in-sulates. 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. Unlike the upstairs, the first floor has a tiled, concrete floor (with large amounts of thermal mass) to absorb heat to radiate later, stabilizing interior temperature fluctuations. U-factor (inverse of R-value), which measures the rate of heat losses through that window to the cold outdoors. The warmer HDD numbers are highlighted in tan, and colder are highlighted in ice blue. "oRD"wB=k:p!TcSm]L When the sun's rays hit an object, such as a window, some of the sun's energy is absorbed, warming that object, and allowed to pass through. IMHO the typical USA under-insulated home with oversized fossil fuel heating and AC is the failed design in need of our greatest attention. This quantity includes both energy that is transmitted directly through the glass as well as energy that is absorbed by the glass and frame and re-radiated into the space, and is given by the following equation:[4], F Note (in the last two columns, #9 and #10) that Denver has better net solar heat gains than anywhere else in the list. HW=oFX72X?A(l5 $?ASN* Wall CLTD selection. 0000051467 00000 n The resources cited in the Appendix or other internet resources may provide climate data for your location or a similar climate nearby. NAAP Labs Motions of the Sun Simulator. That's good for south-facing windows, because in the cold winter, you want the sun beating in your windows, warming your home's interior (and providing daylighting too). Cost of electricity varies over time as well. These cities are geographically dispersed, with more cities located in the northeast and Great Lakes regions. 0000057378 00000 n ( Office of Energy Efficiency & Renewable EnergyForrestal Building1000 Independence Avenue, SWWashington, DC 20585, Fuel Efficient & Alternative Fuel Vehicles, Independently Tested and Certified Energy Performance for Windows, Doors, and Skylights, Energy Performance Ratings for Windows, Doors, and Skylights, Direct conduction and convection heat transfer through the glass or multi-layer glazing and framing, Thermal radiation into a house and out of a house from room-temperature objects, such as exterior walls and windows, people, equipment, furniture, and interior walls, The solar radiation into a house, which is converted to heat when absorbed by building surfaces. Would seem 'Damn the torpedoes, full steam ahead' to catastrophic Global Warming. - Jeff Pendl, Enervision, Cincinnati OH. Elevates mood in winter 0000060426 00000 n SHGC is expressed as a number between 0 and 1. %PDF-1.6 0000036867 00000 n 0000020266 00000 n Florida Energy Code . 0000008843 00000 n My goal was to build an energy-efficient home using materials that cost no more in total than typical home construction. 0000029773 00000 n The design was intended to reduce supplementary space heating substantially and minimize utility bills. Thermal Radiation b. Earth-Sun geometry Terms | 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). Continue readingat SOLAR GAIN TYPES, DEFINITIONS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. 0000048563 00000 n 0000056162 00000 n 0000027723 00000 n Even though south-facing windows have much higher solar gain during December and January than other orientations, the situation in summer has changed significantly due to changes in the position of the sun at midday. E <]>> 0000009311 00000 n 0000056953 00000 n West-facing windows are a bigger concern, needing shading of some sort during hot late afternoons. A vg /ExtGState Locations needing a lot of heating, that have high electricity prices, and that have good net solar gains, get higher scores.
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