Samavirtalämmonvaihdin

Samavirtalämmonvaihdin, also known as a parallel flow heat exchanger, is a type of heat exchanger where the two fluids flow in the same direction. This contrasts with counterflow heat exchangers where the fluids move in opposite directions. In a samavirtalämmonvaihdin, the hot fluid enters at one end and exits at the other, while the cold fluid simultaneously enters at the same end and also exits at the same end.

The design of a samavirtalämmonvaihdin typically involves a series of tubes or channels through which one fluid passes, surrounded by a shell or casing through which the other fluid flows. Heat transfer occurs as the hotter fluid gives up energy to the colder fluid across the separating wall. The temperature difference between the two fluids decreases along the length of the exchanger because the hot fluid cools and the cold fluid heats up.

Samavirtalämmonvaihtimet are generally simpler to construct than counterflow designs. However, their thermal efficiency is typically lower. This is because the maximum possible temperature difference between the two fluids is limited by the outlet temperature of the cold fluid and the inlet temperature of the hot fluid. In contrast, counterflow heat exchangers can achieve a more significant temperature difference, leading to higher efficiency. Despite this limitation, samavirtalämmonvaihtimet are used in various applications where simplicity of design and cost-effectiveness are prioritized over maximum heat transfer efficiency. Examples include some automotive radiators and certain industrial process heating and cooling applications.