ABSTRACT
The feasibility of using highly cold air in air conditioning systems in Riyadh City was
investigated. Computational fluid dynamics technique was used to study air
distributions inside rooms for moderate and highly cold air supply systems. The
current investigation was conducted under the real conditions represent air
conditioning loads and weather in Riyadh city in the Kingdome of Saudi Arabia.
Comparisons between comfort levels under different supply air temperature from 5
oC (highly cold) to 15 oC (classical system) were conducted. The comparison
indicated that using highly cold air system can improve air quality and comfort
conditions inside air-conditioned spaces in Riyadh City.