The right glass can help improve energy efficiency by being chosen for windows on your south side. There are many things to consider, including the glass’s characteristics and the solar heat loss coefficient. Also, consider the price of energy-efficient Windows.
Coefficient of solar heat gain impact
Windows on the south side of a house provide the most benefit for heating during the winter months. This is because south-facing Windows receive 15 times more sunlight in winter and receive triple the solar warmth gain. However, windows on either side of a house receive nearly half the solar heat gains.
The solar heat gain index is a good indicator of the energy efficiency of windows. In winter, windows facing the south are more energy-efficient than those facing the west or east. In the summer, however, windows on the west-side of a house generate more solar heat. The east and west sides of a home are more efficient at providing daylight in colder climates.
South-facing windows are more likely to receive solar radiation. However, they also have higher SHGC values. Window shading can help reduce the amount of summer direct sunlight reaching south facing windows. Also, proper shading of windows can help prevent heat loss in buildings.
Although the SHGC isn’t as important as the U factor, it can still make an impact on energy efficiency. Windows with a SHGC ranging from 0.30 to 0.60 will be ideal for cold climates. They can help maintain the house’s comfort even when air conditioning is used. But it is best to avoid using windows with a SHGC that’s higher than 0.40.
The SHGC determines how much solar heat gain a windows will receive from the sun. It is an important element in designing a house. Low SHGC will not make a huge difference in the performance of your house but it will add unnecessary expenses. You can also manage the sun through building design and trees.
Glass characteristics have an impact
To determine the energy efficiency of your windows, you must first consider the type of glass. Other than U-value, you should also consider the following characteristics: SC, SHGC, or VLT. The specifications provided the glass manufacturer will provide data on these characteristics. Alternatively, you can refer to the ASHRAE tables for solar cooling load (SCL) factors. These tables take into account the temperature differences on either side of a window and are based on the relative levels of the inside and outside surfaces of a house.
A higher VT value indicates that a greater proportion of solar energy is transmitted through the glass. However, this characteristic does not mean that the glass is completely transparent. The type of sealants and spacers used will also affect the heat transfer through glass. The U-factor determines how much heat is lost through the window.
The windows must have at least three feet of overhang. This must be at least three feet high for windows on the south-facing side of a house. Therefore, south-facing windows must have an overhang greater than 2 feet from the glazing’s bottom edge.
Insulating glazing can be used to reduce the impact of winter winds. However, large glass walls can prove to be quite costly. A structural engineer may be required to design and build large glass walls. In addition, it can be costly to install glass walls inside a home.
Glass can be coated to improve their energy efficiency. This type of coating reduces heat transmission and it is called low-emissivity. In addition, low-e coatings block out IR wavelengths and reduce the U-factor. Tinting and coatings are also important factors in determining energy efficiency. Tinting is the process by which colored films and coatings are applied to the glass’s surface. Tinting can alter glass’s properties, but is most often used for artistic purposes. It can also decrease solar gains.
The south side will have windows that allow natural sunlight to flood the house. This can reduce energy use. If you choose to use passive solar design methods, you can tailor your windows for the site location and desired characteristics. You should also consider the shading and insulation options.
Energy-efficient windows are more expensive
It’s important that you choose the right windows for your climate zone when looking for energy-efficient windows. You may need windows with a lower solar warmth coefficient (SHGC) depending on where you live. Those windows will reduce heat loss. The SHGC rating of windows on the south-facing side of a house is higher. This is the ratio of solar radiation and the glazing’s temperature. High SHGC ratings will result in effective heat collection during cold months, while low SHGC ratings will help keep your cooling costs low. Lower air leakage rates mean that outside air escapes less.
The type and size you house will have an impact on your overall savings. Savings will be lower if your house is older and poorly insulated. Older windows will not be as weatherproof as modern ones, and will therefore cost more to replace. EnergyStar says that replacing old windows can result in significant energy and cost savings.
Energy-efficient windows can reduce your utility costs, improve your indoor air quality, and protect your possessions from fading. They can also maintain your home’s temperature throughout the year, helping to reduce your heating and cooling costs. They can also increase the value of your home.
You can make your home more pleasant in summer by installing energy-efficient windows on your south side. A new window on your south side of the house will reduce the heat your house receives from sunlight during the day. You may want to install awnings or shade screen over your windows depending on the climate. These screens should be removed during winter to prevent solar heat from entering your home.
Energy-efficient windows have multiple window panes and high quality window frames. They also include low-e glass coatings and the inclusion of argon gas between each pane. They can reduce air leakage. They are also insulated which will save you money on your energy bills.
How to choose south-facing glass
While the benefits to glass are not immediately apparent, they can reduce your overall project’s costs. Glass can help reduce heat, glare, and greenhouse gases. It can also be a key element in regulating the temperature in your building.
Reflecting solar heat is the best type of glass to use for south-facing windows. You can choose one with a higher R-value and low solar gain, depending on your climate. For cold climates, high-solar-heat-gain glass will help reduce heating costs, but the savings from a lower winter heating load will be offset by increased cooling load in the summer. Glass with a solar heat gain between 4 and 7% of the total area is recommended. To reduce the effect of high-solar heating glass, you might also need to add thermal Mass. Passive solar experts are able to help determine the right amount of glass for your climate.
To optimize the energy efficiency of a home, the orientation of the windows plays a critical role. In winter, windows that face south allow the sun’s heat to heat the home. The greater the solar gain coefficient, more heat will be absorbed by the home. However, awnings and overhangs can reduce heat gain in summer.
The next factor that can affect the energy efficiency of your south-facing windows is the type of glass. You should choose glass with a low solar gain coefficient if your climate’s temperate. Low-e glass will not only reduce heat loss but also allow visible light to pass through.
South-facing windows don’t need shade in winter. West-facing windows, however, need some shading above the Tropics Capricorn. A double-glazed window can be used to block sunlight and increase ventilation during winter. In addition to double-glazed windows, you can install small windows in order to increase the ventilation of the building.