Israel Passive House - Possibilites of Energy Independece

Project Summary

Wattmanager team developed a complex energy simulation of a private house in Israel in view of climate conditions. The aim of the work is the improvement of building energy performance by transformation to the innovative, cost effective sustainable building. The assessment reflects the economic, environmental and cultural values of the building taking into account the needs and well-being of the occupants. The key areas of the building sustainability has been evaluated in accordance with BREEAM world leading certification system.


In Israel there is a high demand on sustainable development and renewable energy due to high utility costs. The opportunity is to escape these high utility costs with improved energy efficiency and solar production facilities.


We happened to face severe challenges as the climate of Israel is fundamentally different to those that Wattmanager has evaluated before, however our experts adapted to the high irradiance environment. The customer’s request was a fully solar powered building, which meant we had to reach 21,6 kWp by solar panels.


First of all we had to measure which thermal insulation method can be applied and to check the profitability of each. Briefly about the so called U value: it measures the heat transmittance of an object, so that our aim was to lower the U value while comparing the investment cost to efficiency. To reach the preferred thermal insulation we advised low U value doors and windows. According to our calculations using concrete and polystyrene combination bricks will generate high cost, yet not promoting the efficiency at such rate, so we do not recommend this solution in case of the examined building . We advised Heating and cooling with heat pumps. In the manner of 3D dynamic simulation, applying 72 pieces of 300 Wp solar panel can create the desired 1538,15 kWh/kWp yield.