The rise in average temperatures caused by climate change in recent decades has contributed to an even greater need for increased outdoor cooling of the human body, even in the temperate climate zone. In this paper three different ventilation element types E1, E2 and E3 are designed to study the effectivity of ventilation at two different wind inlet velocities. These ventilation elements have different geometric dimensions, the main difference is in the dimensions of the outlet of the element from where the inlet air moves to the system and the height of the element. The aim is to see which geometrical shape of the element causes the smallest flow energy losses in the cell flow channel from the inlet to outlet, characterized by the pressure difference (ΔP). The higher ΔP, the higher flow energy losses. If the flow has lost energy (weakened), the body cooling decreases. SolidWorks Flow Simulation is used to calculate the pressure, temperature, and heat flux for the simplified elliptical model of the human body with a protective jacket. The obtained results are compared and analysed to propose the optimum geometric shape of the ventilation element. The pressure and temperature difference for each ventilation element are calculated for the comparison and the obtained results show that element E1 provides lower pressure difference than E3, while E2 gives the lowest pressure difference than both E1 and E3. The results also depict that the element E3 provides less temperature difference than E1 and E2, while in terms of heat transfer all three-ventilation elements show quite close results, since there is a unit ventilation system in the study.