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This paper deals with energy efficient glass in office buildings in Amman city. The objectives of this paper are to understand the role of efficient glass in reducing lighting, heating, and cooling demands and the amount savings to achieve. In addition to suggest main guidelines to follow when designing glazed office buildings for architects and stakeholders, the evaluation of thermal and daylighting performances for a glazed building in Amman was performed by Ecotect and some equations. The reductions in lighting, heating, and cooling loads and energy cost were evaluated through a comparative simulation among three glass types considering four optical and thermal variables: U-value, visual light transmission (VLT), solar heat gain coefficient (SHGC), and solar coefficient (SC). Results show that the basic factors to enhance buildings energy behavior are: building location and the availability of solar radiation at the selected location. In addition to the building orientation and glass optical and thermal properties, the energy efficiency of buildings increases when the building orientation is between 125° and 235°, and the installed glass has U-value less than 1.5 Wm2/k, VLT between 20% and 50% and SHGC and SC less than 0.2. The implementation of these properties reduced the building electricity cost for lighting, heating, and cooling by 45%-53%.

The aim of this study is to show the critical aspects of a completely glazed high rise office building from an energy efficiency point of view in different European climates. The achievable consumptions and the most influential parameters such as glazing U-value, VT/SHGC and shading and their optimal values were investigated. The study has been carried out for a theoretical office building in Italy and Lithuania, representatively of a southern and northern EU climate. The building chosen is representative of all the glazed-simple shape buildings and the analysis of the entirety of the building enables a clear and im-mediate outcome of global consumptions. Number of DesignBuilder simulations were performed and the annual consumptions are summed with the primary energy criteria. Results show the critical aspects of 100% WWR buildings: in the coldest climate the main problem is the huge surface of relatively high glass U-value compared with standard walls, while in the warmer one the main efforts need to be done to avoid the summer overheating caused by incoming solar radiation. Finally, it is shown that it is difficult to lower the overall primary energy consumptions below 130 and 140 kWh/m2a for North-Italy and Lithuania locations respectively. The analysis is focused only in the envelope parameter, thus it is not included renewable energy systems, which can generate higher energy efficiencies. Santrauka Straipsnyje pateikiamo tyrimo tikslas – parodyti kritinius daugiaaukščių administracinių pastatų su dideliais įstiklinimo plotais atitvarų charakteristikų aspektus energinio efektyvumo požiūriu esant skirtingam klimatui. Buvo tiriami labiausiai įtaką energiniam efektyvumui darantys parametrai – šilumos perdavimo koeficientai U, šviesos ir visuminio saulės energijos praleisties koeficientų santykis VT/SHGC bei apsaugos nuo saulės priemonės ir optimalūs jų dydžiai. Buvo atliekama teorinio administracinio pastato Italijoje ir Lietuvoje analizė. Šios vietovės buvo parinktos Europos pietiniam ir šiauriniam klimatui reprezentuoti. Parinktas pastatas yra tipinės nesudėtingos formos, su visiškai įstiklintais fasadais. Pastato charakteristikų įtaka vertinama kompleksiškai modeliuojant pastato metinius energijos poreikius taikant DesignBuilder programą, vertinimo kriterijus – metiniai pirminės energijos poreikiai. Rezultatai parodė, kad pastatui su 100 % fasado įstiklinimo plotu nustatyti kritiniai aspektai yra: esant šaltam klimatui pagrindinė problema yra dideli atitvarų plotai, kuriems būdingas sąlygiškai didelis šilumos perdavimo koeficientas, lyginant su neskaidriomis atitvaromis, o esant šiltam klimatui reikia dėti pastangas, kad būtų sumažinti milžiniški šilumos pritėkiai, atsirandantys dėl saulės. Straipsnyje parodyta, kad vien optimizuojant atitvarų charakteristikas sudėtinga pasiekti metinius pirminės energijos poreikius, mažesnius nei 130 ir 140 kWh/m2, esant Italijos ir Lietuvos klimatui atitinkamai. Tyrime nevertinamas atsinaujinančios energijos išteklių panaudojimas, kuris gali itin padidinti pastato energinį naudingumą. Reikšminiai žodžiai: administracinis pastatas; klimatas; energinis efektyvumas; atitvaros; stiklinis fasadas; apsauga nuo saulės.

Double skin glazed facades (DGF) are an actual worldwide trend in new and refurbished buildings, even in warm climates with high solar radiation levels as in the Middle East and in Mediterranean climates. In such climates, overheating of indoor spaces and therefore excessive energy consumption are the main problems to be faced. These issues are commonly addressed mostly by thermal simulation or experimental evaluations on small prototypes. However, measurements on real-scale buildings with DGFs are very unusual. This information is crucial to understand and validate the predictions of the thermal behavior of the DGF technology. In this paper, thermal measurements were carried out in an unoccupied office building with a West DGF placed in the Northwest region of Argentina during 3 months in spring/summer. The air temperature exceeded in 10 °C the outdoor air and that indoor temperatures have not exceeded the outdoor levels in the hottest hours. Two correct design decisions were the use of low-e double hermetic glazing and the addition of a screenpainting to the external DGF panel. The experimental data showed that well-designed DGFs can reduce the summer energy consumption of buildings, even using West DGFs, in sunny climates. [ABSTRACT FROM AUTHOR]