Vesselin Nedyalkov Dipl. Arch, Vladimir Nedyalkov Dipl. Arch.

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The efforts to define the concept of a “passive home” will be powerless without the knowledge and experience of traditions.
But the Tradition is not a book with ready to use recipes. To know the Tradition is not enough for the challenge that the new problems expose.
The beneficial union of the tradition & innovations will be the right key.
The tradition of creating and living in a house in bulgarian lands is very old and stable from ancient times to present days.
This tradition has gained the experience of hundreds of generations and it has demonstrated its ability of successfully adapting human dwelling in the surrounding environment to reach harmony with nature,  high living  culture and unique style.
The characteristics of local climate, with large variations in temperature from hot summers to very cold winters have led to permanent elements in the design of the houses. Surprisingly we can find that many of the paradigms of modern “passive house” were discovered by our ancestors and their use is actually traditional.
For example the eaves, cornices that finish the roof,  are traditionally long and well shaped providing protection from the sun in summer, while in winter
when the sun is lower and its warmth is desired, the eaves allow solar energy to come inside.
The cultivation of deciduous trees and grapes upon special structures called "asma" on the sunniest side of the house is also an element of the behavior of people connected to the energy. In summer the wide leaves provide protection from the sun but in the winter when they are fallen the sun can easily reach the living spaces.
The design of the house that we propose combines in one traditional and modern understanding of contemporary passive house.
There’s no doubt that the compact shape is quite necessary . Reduced external surfaces and small number of corners lead to lower interaction between the house and the unfavorable environmental factors.
Therefore we have chosen the shape of "duogonal" - lenticular form - a poet would name it a "ship - shaped" but it is also a shape of airplane wing.
This compact form surprisingly brings many benefits.
For example contact surface of the outer walls of the house was reduced by almost 10% compared to a house with the same area but with a rectangular shape.
The "duogonal" shape is also beneficial to the building with its only two corners which means less lost heat.
Further, aerodynamics of “airplane wings” reduces the fluid interaction so the cold winter wind affects less for cooling the house.
Cylindrical surfaces of the façade walls is expected to work in the same direction- of concentrating the heat.
The technology of building can be selected from multiple equivalent technologies.
The choice is most often result of economic and technological considerations.
Here we have chosen the technology of large fabricated building components, representing a core of expanded polystyrene with the required thickness of 30 cm for walls, 40 cm and more for the roof slab with 3-4cm thick steel wire mesh reinforced concrete shell, spraying in place on both sides of the wall. This technology allows to build passive houses at affordable price in the existing economic and technological conditions in Bulgaria.
The windows can be chosen from great list of contemporary window makers with attention for main passive house attributes – energy saving in all aspects, but providing maximum solar light.
Finishing and furnishing will not significantly affect the expected result.
Technical devices such as ventilation system with ground heat exchanger and main heat exchanger a.k.a. recuperator, solar heating of water and etc. are always welcome to help architectural solution, but the main mast bearing the overall concept is the architecture, shape and composition of the building.
Greenery is a great ally for the expected result, so it is an indispensable component in the total harmony of the "passive house".
All these innovative proposals, combined with traditional elements of composition, such as eaves and shading devices that will act as protective agents in the interest of security, combined with efficient technical devices are expected to achieve the expected purpose – to create a passive house at attractive price.
It is important to note that for the architect the house is not only a "machine for living" but it is a cultural event, an act of fine art, a thin layer of the multilayered culture, a sign of contemporary life – the future past.