טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentLeibu Juanita
SubjectDemonstration of An Energetic Economical Analysis for
DepartmentDepartment of Architecture and Town Planning
Supervisor Mr. Milo-Emil Hoffman


Abstract

The purpose of this research is to improve basic human needs of thermal comfort in existing high rise multi-family units and at the same time to reduce non-renewable energy consumption due the implementation of thermal insulation and passive energy methods with the consequent economic benefits.


Most investigations on this subject were focused on improving thermal insulation and attaching additional Passive Solar Methods especially for residences. This work is a study of practical and homeowner self-decision retrofit measures for high risk multi-family units in Israel that have minimum required by standards of thermal insulation and usually have enough inertial thermal mass (concrete ceiling and massive partitions). Alternative solutions are studied using throughout thermodynamic ca1culations and a simple payback period (SPP) cost analysis. The thermo-dynamic analysis uses a combination of the QuickTEMP with subroutines of the TTTC computer program for a Personal Computer.


The problem studied deals with the reduction of heat transfer through building components, mainly through wall aperture when using single clear glass. This research had found not necessary to improve external wall and roofs thermal insulation as a consequence of the sufficient inertial thermal mass for time-lag. Improvement of wall aperture insulation is considered in the form of double glazing or closing exterior balconies wall aperture with glass, and includes the use of new technologies using Low-emissivity glazing.


New glazing systems are presented and studied for two rooms models (Room A with an exterior wall aperture and Room B with an adjacent open balcony) based on Multi-family units prototype. The introduction of insulated glazing windows and closing balconies are demonstrated to be advantageous measure in the non-renewable energy consumption saving under winter and summer season providing thermal comfort to home-user, under Israel climatic conditions. Primary additional investigation reveals that this non-renewable energy saving is obtained even in buildings constructed without the minimum required by Standard of insulation NIS 1045.


The evaluation results presented in this work will contribute to the improvement of energy saving in existing dwelling thermal conditions under a very low initial and no extra maintenance cost. At the same time, presents an option for new building design even more feasible than as Retrofit measure. Closing the balcony and the insulating glazing system cost are not an additional investment consequently present shorter payback period. These conclusions are valid for all Climatic Zone like the Mediterranean Countries and Hot Desert Arid Zones.


The importance these proposed retrofit measures (introduction of insulated glazing systems and closing balconies) implies National energy saving of 6% to 9% on Israel total non-renewable energy consumption, been obvious the motivation to contemplate these conclusions by the local Authorities.