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Forced and natural ventilation of a room with a combined solar chimney and Earth - to - Air Heat Exchanger system
Forced and natural ventilation of a room with a combined solar chimney and Earth - to - Air Heat Exchanger system
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Date
2021
Authors
V T Nguyen
Y Q Nguyen
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Research Projects
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Abstract
In this study, a passive ventilation and cooling technique which is widely used in
sustainable building designs was investigated by a numerical simulation based on computational
fluid dynamics (CFD). A system of a solar chimney (SC) and an Earth-to-Air Heat Exchanger
(EAHE) is able to ensure thermal comfort in a house by generating an air flow which is induced
by the thermal effect. The solar chimney drew ambient air (at 35°C) through the inlet of EAHE;
the air flow was cooled by a lower temperature of the underground pipes (at 20°C) before
circulating inside the house and leaving through the outlet of the solar chimney. Both the
openings of the system were exposed to the atmosphere, and the atmospheric pressure was set at
the inlet of the EAHE pipe and the outlet of the solar chimney. The performance of this
ventilation and cooling system was analyzed under effects of design parameters, including the
gap of the chimney, the diameter and length of the EAHE pipe as well as the solar heat flux
applied on the wall of the air channel of the chimney. The results of the assessed parameters,
such as temperature inside the house, show that the indoor temperature was reduced to 25°C and
26°C, respectively for the forced ventilation case of 0.2 m/s and natural ventilation case in the
configuration with the EAHE pipe length of 11m. The coupled solar chimney and EAHE system
can achieve the thermal comfort conditions for both cases of natural and forced ventilation
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Keywords
solar chimney,
EAHE,
CFD,
thermal comfort.