Theoretical analysis to investigate thermal performance of co-axial heat pipe solar collector |
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Authors: | E Azad |
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Institution: | (1) Advanced Materials and Renewable Energy Department, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran |
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Abstract: | The thermal performance of co-axial heat pipe solar collector which consist of a collector 15 co-axial heat pipes surrounded
by a transparent envelope and which heat a fluid flowing through the condenser tubes have been predicted using heat transfer
analytical methods. The analysis considers conductive and convective losses and energy transferred to a fluid flowing through
the collector condenser tubes. The thermal performances of co-axial heat pipe solar collector is developed and are used to
determine the collector efficiency, which is defined as the ratio of heat taken from the water flowing in the condenser tube
and the solar radiation striking the collector absorber. The theoretical water outlet temperature and efficiency are compared
with experimental results and it shows good agreement between them. The main advantage of this collector is that inclination
of collector does not have influence on performance of co-axial heat pipe solar collector therefore it can be positioned at
any angle from horizontal to vertical. In high building where the roof area is not enough the co-axial heat pipe solar collectors
can be installed on the roof as well as wall of the building. The other advantage is each heat pipe can be topologically disconnected
from the manifold. |
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