In hot and humid climates, this paper describes a study to estimate the energy savings 
potential of a radiant system using simulation analysis. The medium size office buildings in
Egypt used as a case study. To evaluate the thermal performance and energy consumption, 
the simulations were carried out using the IDA ICE software. 
This paper addresses the compatibility between radiant cooling systems and the climates 
in the buildings mainly through the issue of condensation risk. The risk of condensation can 
be reduced, by dehumidifying the supply air in different cases. Five heating, ventilation, and 
air-conditioning (HVAC) systems namely: direct expansion Split Units (DX-SU), 
Displacement Ventilation (DV), Chilled Ceiling with Displacement Ventilation (CC-DV), 
Radiant Floor with Displacement Ventilation (FR-DV) and Radiant Wall with Displacement 
Ventilation (WR-DV) are simulated.
All simulations were performed for the whole year. However, two separate weeks in 
winter and summer are selected to investigate the thermal performance in addition of the 
energy consumption. The results showed that (RW-DV) system achieves 14.36% and 
24.03% total energy saving from the base system (DX-SU) for the winter and summer 
seasons, respectively. While the DV system achieves 1.6% and 12% total energy saving from 
the base system (DX-SU) for the winter and summer seasons, respectively.