Author : Kassem Mohammed, Ahmad
journal of kerbala university,
2014, Volume 10, Issue 4, Pages 278-291
Due to intensive use of energy, with a decline in natural resources, view of the CFCs damage on ozone layers and an increase in fuel costs, it has become important to find methods of reducing energy consumption and finding alternative energy sources.
Radiant cooling system is a tool used to achieve these benefits, while maintaining acceptable thermal comfort conditions.
The main aim of the present study is to test radiant cooling ceiling system in Iraq climate established in a typical office focusing on occupant’s thermal comfort.
A theoretical model has been developed to predict the panel temperature, the interior surface temperatures of the office and heat output for radiant cooling panel systems.
To validate the theoretical model, an experimental work was performed on radiant panels of, (6.2X4.6X3)m full-scale office room was utilized in Technical Institute of Karbala.
The systems are constructed from 77 plates at a 0.05-mm-thick aluminum sheet with dimensions of (60×60) cm, in which the plates cover whole the ceiling and are cooled with water circulating through (1/2) inch copper tube.
The cooled water achieved from the well that manually drilling near the test room at dimensions are (15) cm in diameter and at (6) m depth.
Ventilation fan with two cooling coils that was used to maintains acceptable indoor air quality by supplying fresh, filtered air.
The study shows, the radiant cooling system can be applied for Iraqi buildings under the tropical climate and that approximately 71% energy saving can be obtained.
As the inside temperature of the walls surface has a great effect on the thermal comfort of persons in the conditioned space, the radiant system succeeded in making the differences between the mean radiant temperature and room air temperature is 2oC and between the room air temperature and radiant surface temperature is 5oC and the values of PMV-PPD were used to examine thermal comfort and found that the use of radiant cooling system is appropriate for creating comfortable indoor conditions.
The study shows also that effective usage of renewable energy sources that provides economic and environmental benefits.