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Life cycle cost analysis between double glazed and

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Windows typically occupy about 15 to 20 percent of the surface area of the walls. Windows not only add aesthetic looks and often a very important aspect of a home, but also a very significant component of home heating and cooling costs. Windows lose more heat per square meter of area in winter and gain more heat in summer than any other surface in the home if not energy efficient.

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Life cycle cost analysis between double glazed and

  1. 1. LIFE CYCLE COST ANALYSIS BETWEEN DOUBLE GLAZED AND TRIPLE GLAZED WINDOW TO PROPOSED STUDENT HOUSE BUKAR ALI KIME 17500831
  2. 2. ABSTRACT • Windows typically occupy about 15 to 20 percent of the surface area of the walls. Windows not only add aesthetic looks and often a very important aspect of a home, but also a very significant component of home heating and cooling costs. Windows lose more heat per square meter of area in winter and gain more heat in summer than any other surface in the home if not energy efficient.
  3. 3. INTRODUCTION • An average home loses up to 25% - 30% of its heating and cooling energy around windows and doors. If you have inefficient windows installed in your building, you also have rising energy costs because of the energy that you will used for the heating and cooling of the house. An energy efficient home is a comfortable home, as it is one that is easier to heat or cool.
  4. 4. DOUBLE GLAZED WINDOW • Double-glazed windows have two panes of glass fitted into a window frame. An inert gas like argon is filled between the two panes to increase insulation. Double glazed glass is perfect for weather conditions, especially where there are scorching summers and moderate winters. The double window panes not only provide relief from extreme temperatures outside, but also insulate your space from the noise outside. They are also very hard to break through and therefore provide you with ample security against intruders.
  5. 5. HOW DOUBLE GLAZED WINDOW WORKS • A single pane of glass provides very poor insulation because glass is a good conductor of heat. So much of the heat in your room literally goes out the window. Install double glazing and you have a layer of air or argon gas trapped between two panes of glass. Because air or argon gas is a poor conductor of heat, much less heat is lost through the window. If the inside of one sheet has Low E coating, even less heat is lost because the coating reflects heat back into the room. A house with double glazed window operates just like fibreglass batts and woollen clothing. It traps a layer of air or argon gas between two panes. Air or argon gas is a very poor conductor of heat, so the trapped layer sets up a blanket of protection between cold air on one side and warm on the other. Glass itself is a very good conductor. So in a home without double glazed window, heat is going straight out of the window. As shown in the figure 4. Argon gas is an inter gas.
  6. 6. TRIPLE GLAZED WINDOW • Triple-glazed windows, as the name suggests, have three panes of glass fitted into a frame. The three sheets of glass have two air gaps filled with argon. • These window offer 28% - 30% (approximate) more insulation than double-glazed window. It also decreases thermal transfer by 75% - 80% making it the most energy-efficient option around. It also mitigates noise. Therefore, triple-glazed windows perform all the functions of double-glazed windows, but with more effectiveness. They are just marginally more expensive.
  7. 7. HOW TRIPLE GLAZED WINDOW WORKS • Windows has many uses such as allowing light into a building, enable us to see outside from the home and, at the same time, keeping the inclement weather out. All this be achieved by a window with a single pane of glass, triple glazed units provide the more insulation against the loss of heat, wind, rain and reduce noise levels from outside the home.
  8. 8. METHODOLOGY This research focuses on the following two questions: • The energetic performance of window types (does double glazed or triple glazed window reduce required heating and cooling energy?) • Life Cycle Cost analysis of the two types (is it financially beneficial and feasible to invest in triple glazed or double glazed window?) The energetic performance is measured using computer analysis software (EnergyPlus), which also gives us our usage cost. Using life cycle analysis data, a comparison is made concerning the environmental costs of the product itself, and a quick cost comparison shows the financial benefits and drawbacks between the two products and the payback period of the two different window types.
  9. 9. CASE STUDY • The case study of this experiment is setup for a proposed student house for Eastern Mediterranean University Located Famagusta North Cyprus. The house is 350 meters square with openings on each side. It consists of 6 bedrooms 3 livings and a study room where by must to the living space are oriented to face the south side for passive solar energy gain during winter, and this can also reduce the heating load as well.
  10. 10. TESTED GLAZING TYPES • There are many type of available glass that can be compared are chosen for this research. For this research, five type were tested, all commonly used products in building industry, and standardized for energy-plus calculation (energy calculation software or simulators). A single plate glass type is used as a reference, and for each double and triple glazing unit a high performance variant is added. “UGlass” is the insulation value, and “Trans” is the transmission value. The once with “HR” means glazing with Low-E Coating in the middle of the glaze.
  11. 11. ENERGY CALCULATION • The graph in figure 6 above shows the total energy usages of the various glazing types and for the 30% and 90% south glazing houses, as well as the models with increased wall insulation. It's immediately clear that there are large benefits to using double glazing types and beyond. It's also clear that the double HR glass outperforms the normal triple glazed unit.
  12. 12. CO2 GENERATION AND SOLAR GAIN • From figure 7 above, it shows that the left side of the figure shows the gas usage versus CO2 emissions. We can see that they are related, but that CO2 emissions are not decreasing by as much as the gas usage of the entire house. This is due to other forms of energy use within the house such as electricity and water. This means that only a limited amount of CO2 reductions can be affected by glazing types. • On the right of figure 7 we can see a large difference in solar gains between the different glazing types due to the difference in transmission values. Glass with a higher transmission value admits more light and heat from the sun. In winter this has a direct effect on gas usage, and the effect is in the same order of magnitude as the gas usage itself. This explains why the double HR glass outperforms the normal triple glazing types, despite the higher insulation value of the triple glass types, because the double HR glass allows more solar energy to enter the house, which will help in heating the building interior during the winter time of the year. Which will also drastically reduce the use of gas itself.
  13. 13. COST When you start investing for double glazing or triple glazed windows, you'll find the following aspect affecting the cost of the window: • The material the window frames are made from • The window style • The type of glazing used • The size of your installation Source: Leroy Merlin Company (https://www.leroymerlin.com.cy/)
  14. 14. COST SAVINGS • All houses lose energy through their windows. It is a natural thing. But double glazing or triple glazing keeps your home warmer or cooler as well as reducing your energy bills. The costs and savings will be different for every home, depending on its size and the quality of the glazing types. It is expected that on a standard house, you can save approximately 200-250 euros per year with double glazing and 200-280 euros per year with triple glazing.
  15. 15. SCENARIO S/n o Cost Double Glazed Window Triple Glazed Window 1. Investment Cost 350 x 12 = 4200 euros 460 x 12 = 5520 euros 2. Implementation cost 7 x 20 = 140 euros 10 x 20 = 200 euros 3. Maintenance cost 3 euros/year 5 euros/year 4. Electricity bill saving 200 euros/year 200 euros/year 5. Life span 20 years 20 years Following a simplified version of the proposed case study models, I am comparing the implementation costs with the benefits gained during the life span of the product. The double glazed and triple glazed (HR) products are shown for a period of 20 years. For the proposed student house with south glazing (12 glass opening of 2.1 x 1.2m). We are using a value of 350euro for double glazed window and 460euro for triple glazing with an interest rate of 6%.

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