So, let's ask how well a passive solar system will serve. The key postulate lies in the following: in summer, the eaves shade the windows from high-end sunlight, and in winter, the low sun seeps freely to you. To verify this theory, i set up my cad software to generate a series of sun positions for days inside the warm season or in the first half of winter. Then i took the photos that he created and turned it into two animations. To put it mildly, the results were fantastic. Look. Do not forget that the double-glazed windows appear to the south, so the sun starts to the right of the picture and moves from the top to the left. Shadows appear as light areas of the green exterior. Click refresh to synchronize the summer and winter cycles. The right wall begins to light up, while the sun rises very urgently, in this regard, the manipulations of the window are shaded. The windows remain completely shaded during most of the day, or only a small amount of slanting light seeps in when the day arrives. The summer solar gain for a similar configuration is very low. Here, passive house windows same time sequence (less sunshine hours) causes the opposite shadow effect. Since the sun rises much further south in winter, the front of the house is almost immediately illuminated. Throughout the entire time, the sun never rises high enough for any shadow to reach the windows. It can be seen that the early morning and afternoon sun seeps well into the living space. The winter solar heat gain is too high for this configuration. Geothermal heating and cooling. Plus the sale of land for the shelter of the house, the land is also used as a source/sink of constant temperature for the geothermal hvac system. An extensive circuit of water-containing layers is used to power two ground-based heat pumps. One heat pump generates hot water for everyday use (shower stalls, etc.) And for heating the radiant stove. Another heat pump is used for heating or cooling the air duct. In addition to such an efficient heating / cooling system, the regular flow ventilation scheme uses a passive heat exchanger to recover energy from the exhaust air. The system diagram is shown below.