Winter came, and I decided to improve the ventilation system in my country house. Until that moment, it was practically absent, all ventilation was carried out by opening the windows, throwing out warm exhaust air and letting in cold fresh from the street. I heard something about recuperation systems (recuperatio - return receipt, return), allowing not only to throw out heat along with the air, but to use it to heat incoming fresh air with a noticeable saving of energy on heating. Thinking - and why not, I decided to try to make such a system myself.
The theoretical part is very simple.
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What's the secret? In a huge heat exchange area and a successful design. 17 m2 of foil versus 4-5 m2 in store recuperators. The prismatic shape of the heat exchanger instead of 2-3 square heat exchangers allows more efficient use of the area and volume inside the heat exchanger. Calculations of the heat “power” of the recuperator showed about one and a half kilowatts of energy saving for air heating.
Video of the process of creating a recuperator: