Tubular heat exchangers represent the simplest type of heat exchanger and are the preferred solution for transferring heat with high pressure differences or between high viscosity media (e.g. sludge). An advantage is the uniform flow through the tube space. This space is free of flow dead zones.
The WL 110.01 is part of a series of units enabling experiments to be performed on different heat exchanger types. In conjunction with the WL 110 service unit, which has a hot and cold water circuit and all of the necessary connections, the experimental unit is ideally suited for investigating the functioning and behaviour of a tubular heat exchanger in operation. The WL 110.01 is connected to the WL 110 using quick-release couplings. Hot water flows continuously through the inner tube and cold water through the outer tube. Part of the thermal energy of the hot water is transferred to the cold water. Valves on the service unit are used to adjust the flow of hot and cold water. The supply hose can be reconnected using quick-release couplings, allowing the flow direction to be reversed. This allows parallel flow and counterflow operation. Temperature sensors for measuring the inlet and outlet temperatures are located at the supply connections on the WL 110. There are two additional temperature sensors on the tubular heat exchanger for measuring the temperature after half of the transfer distance. During experiments, temperature curves are plotted and displayed graphically. Additionally, the measured values can be recorded and processed using data acquisition software. The mean heat transfer
coefficient is then calculated as a characteristic variable. The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
Learning Objectives / Experiments
In conjunction with WL 110 service unit - function and behaviour during operation of a tubular heat exchanger - plotting temperature curves * in parallel flow operation * in counterflow operation - calculation of mean heat transfer coefficient - comparison with other heat exchanger types
* Tubular heat exchanger for connection to WL 110 service unit1 * Visible flow channel due to transparent outer tube
 tubular heat exchanger for connection to WL 110  hot and cold water supply from WL 110  parallel flow and counterflow operation possible
 recording of temperature using WL 110 and two additional temperature sensors for measuring the central temperature