nestekylmäyshöyrystimet

Nestekylmäyshöyrystimet, also known as flooded evaporators, are a type of heat exchanger used in refrigeration and air conditioning systems. They are characterized by a design where the refrigerant completely fills the evaporator tubes during operation. This ensures maximum contact between the refrigerant and the heat transfer surface, leading to very efficient evaporation of the liquid refrigerant.

In a nestekylmäyshöyrystin, liquid refrigerant enters from the bottom and is distributed among the tubes. As heat is absorbed from the surrounding medium (e.g., air or water), the refrigerant boils and turns into a vapor. The vapor then rises and exits the evaporator, typically passing through a separator or a surge drum that ensures only vapor leaves the unit, while any remaining liquid is recirculated. This design maintains a constant liquid level, which is crucial for optimal performance.

The primary advantage of nestekylmäyshöyrystimet is their high thermal efficiency due to the full tube flooding. They are particularly well-suited for applications requiring precise temperature control and high cooling loads, such as in large industrial refrigeration plants or for chilling water in large building HVAC systems. However, their complexity and the need for careful refrigerant level control can make them more expensive and require more maintenance than other evaporator types, like dry evaporators. The design also necessitates a refrigerant charge larger than that of a comparable dry evaporator.