nesteputkijäähdyttimet

Nesteputkijäähdyttimet, known in English as tube-in-tube heat exchangers or simply double pipe heat exchangers, are a basic type of heat exchanger. They consist of two concentric pipes, where one fluid flows through the inner pipe and another fluid flows through the annular space between the inner and outer pipes. Heat transfer occurs across the wall of the inner pipe. The direction of flow for the two fluids can be co-current (same direction) or counter-current (opposite directions). Counter-current flow is generally more efficient for heat transfer.

These heat exchangers are relatively simple in design and construction, making them cost-effective for certain applications. They are often used for moderate temperatures and pressures and for relatively small flow rates. The surface area for heat transfer can be increased by using multiple pipe sections connected in series or parallel. Helical fins can also be added to the inner or outer pipe to enhance heat transfer.

Nesteputkijäähdyttimet find applications in various industries, including chemical processing, food and beverage production, and HVAC systems. They are commonly used for heating or cooling liquids. Their simplicity, ease of maintenance, and robustness make them a suitable choice when high efficiency is not the primary concern, or when dealing with fouling fluids where easier cleaning is advantageous compared to more complex exchanger designs. Despite their simplicity, they are effective in many industrial processes.