Every year with the arrival of winter in edition beginning to receive letters in which readers expressed legitimate confusion about unreasonable, in their view, the energy consumption of household refrigerators. Indeed, at a time when the window — bitter frost home refrigerator with a rumbling absorb all the new kilowatt hours of electricity to lower the temperature inside the refrigeration Cabinet two to five degrees Celsius and inside the “freezer” — to minus ten or fifteen. However, today few people remember that in the houses built before the war in the kitchens was located built-in wardrobe-fridge, which is a niche in the outer wall, which with a few holes communicating with the outside air and had a thick door with insulation. Of course, this refrigerator was not very reliable: when you thaw frozen foods melted, and in extreme cold turned into ice blocks that freeze should not.
Of course, you can equip this chill Cabinet is quite simple temperature controllers developed by our reader Yu Riabokon, which uses the effect of water expanding when it freezes (see “M-K” №8, 1991). However, such a controller will not save the products upon the occurrence of a thaw. That is why many authors propose variants of combined devices that combine the advantages of electric refrigerators and cabinets that use outdoor cold.
For example, one such proposal. Our reader N. Soprunov, resident of the settlement Coastal the Samara region, informs that with the purpose of increasing resource and energy savings, he combined the cavity of the refrigerator “Saratov” with a street atmosphere. For this purpose, the side wall of the housing to cut a hole for the pipe with a diameter of about 20 mm, and the cut off corners of Windows, as shown in the figure. Rubber tube to reduce heat loss he wrapped cloth and on top — polyethylene film; one end of the tube inserted into the hole in the side wall of the refrigerator, and the second brought out the window. The cracks around the tube sealed. According to the observations of N. Soprunova, this modified refrigerator was much less activated when the same position of the thermostat controller. When the temperature of the air outside becomes positive, the tube is sealed with a cork.
We believe that the effectiveness of the use of “gratis” cold could be even higher if it ensured at least a minimal convection of the incoming cold air. For this we need to cut at least two holes in the fridge, output two tubes, providing one of them a simple baffle, allowing for any wind to provide sucking action of the air through the cavity of the refrigerator. And the tube for air supply could be more.