Today, the importance of energy costs is constantly increasing. Energy saving studies in

buildings gained importance all over the world after the oil crisis in the 1960s. In this

respect, energy saving has come to the fore in Turkey and tried to be controlled by various

regulations. Today, instead of perceiving energy saving as only thermal insulation,

the main goal should be to improve the performance of the system, and the improvement

of the HVAC system or system selection should be considered together with thermal insulation.

In order for HVAC efficiency to reach the maximum point, it is inevitable that

the system will be designed as low temperature heating and high temperature cooling. At

this point, the system solution shows us heating and cooling from the ceiling or floor. The

radiant cooling system has been growing in recent years due to energy savings, comfort

and health. At the point of designing the system, the condensation problem on the cold

ceiling surface and the determination and measures of the refrigerant temperature, the

effects of the heat sources in the space on the system performance are important. In the

test room created according to BS EN 14240:2004 and BS EN 14518:2005 standards, the

performance change of cold ceiling panel according to different water temperatures,

different water flow rates and different heat source values were investigated.