טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentRingel Gal
SubjectAn Energetic Profile for Existing office Buildings
DepartmentDepartment of Architecture and Town Planning
Supervisor Professor Isaac Guedi Capeluto


Abstract

Standards for sustainable design and energy efficiency in buildings are continuously being developed under the title of "Green Building" in Israel and abroad. However, a large number of existing buildings were not built in accordance with these green principles. In the US new "Green Buildings" are growing at a rate of 20% per year, but new construction accounts for only 2% of existing buildings. In addition, there is a wide range of results measured for energetic function of buildings that were systematically evaluated by green rating systems, such as LEED.

The term "Profile" is often used in different disciplines to identify the fundamental properties of an object, while analyzing future steps to use them: companies and corporations use Business Profile for firms or products, employment agencies use Personality Profile to identify the qualifications of a candidate for a job, and there is even a Constructive Profile for testing a structure’s resistance to earthquakes.

The motivation for this research is to create an Energetic Profile, inspired by a simple blood test indentifying the inner condition of a person. In the same way, the aim of the Energetic Profile is to define the energetic potential of an existing building, compared to other buildings and to itself.

In this research, the features of Energetic Profile for Existing Office Buildings were developed. The Energetic Profile consists of seven architectural parameters. The parameters are geometric and fundamental in nature, simulating the building in its construction stage, before finishing materials and building systems are added. The suggested profile scans the building from macro to micro, analyzing the influence of its nearest surrounding environment, the building morphological characteristics up to the plan of the typical floor.

The seven parameters comprising the Energetic Profile are: (1) Building’s environment (2) Building’s envelope (3) Compactness (4) Form factor (5) Flexibility (6) Floor efficiency (7) Space type division.

The Energetic Profile enables the analysis of energy saving opportunities for different office buildings, identifying its unique characteristics. In addition, the profile enables distinction between  energetic- architectural typologies of office buildings which are not commonly discussed in green standards and rating systems.

For each of the parameters a methodology was developed to investigate the impact of the parameter on the total energy consumption (divided into cooling, heating and lighting) in a theoretical office building located in a hot and humid climate typical of Tel- Aviv. Simulations to calculate the energy consumption in each case were performed using ENERGYui interface, based on the energy simulation program EnergyPlus.

The use of the Energetic Profile for Existing Office Buildings was examined through case studies which demonstrate the effectiveness of the tool to identify potential action directions for energy savings for an existing office building, compare design alternatives, and examine the influence of various construction phases of the building.  The case studies presented in this work proved up to 50% in savings potential compared to current condition, when implementing the conclusions of the profile. Future contribution is displayed as an auxiliary tool for planning new office buildings.