The objective of this study is to design and simulate a vapour-compression refrigeration cycle and dew point cooling system. Besides, to identify air characteristic in Riyadh city which is has high temperature 44°C with relative humidity 25% the identification of climate is to create appropriate environment and high efficiency cooling. However, the cooling load for small room 20 m2 reached to 3.9 kw because the temperature is very hot. The simulation for refrigeration and dew point cooling system shows the air distribution inside the room, from simulation the air distribution remains constant from 0s to 1 hour because it supplies air each cycle. The velocity for air conditioning is 2 m/s to provide comfort zone. The refrigerant R410a is taken as work fluid for refrigeration cycle.
