Keywords
Two-phase thermosiphon
Passive cooling
Bioclimatic strategy
How to Cite
Abstract
Research shows that the world faces global warming, which is expected to be irreversible by the end of this century. With the temperature elevation, the need to cool internal ambient in buildings increases, and new energy-saving technologies must be employed. Thus, investigating and proposing new passive cooling methods is needed. The present study aims to evaluate the feasibility of applying two-phase thermosyphons to cool indoor environments. For this, a test cell integrated with a copper coil, which simulated the evaporator section of a thermosyphon, was experimentally studied. A temperature-controlled thermal bath kept the coil temperature at a prescribed and uniform temperature along its length. Overall, the device was able to extract heat passively. The device managed to reduce the temperature of the indoor air significantly. Much of the heat was extracted in the first hour of the test and, in some cases, in the initial first and halt hours. However, less heat was removed when the temperature difference between the coil and the cell was equal to or less than 7°C. A similarity in the internal air temperature distributions in all tests was observed, with a higher temperature level at the upper quadrants of the cell. The speed of stabilization of the temperatures of the internal faces coincided when the temperature of the copper coil increased.
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