DESCRIPTION

Technical Description

In heat exchangers, thermal energy is transferred from one mass flow to another. The two mass flows do not come into contact with each other in this process. To avoid losses, efficient heat transfer must be ensured.  For this reason, different types of heat exchangers are used in practice, depending on the requirements.

The WL 315C trainer enables students to examine and compare five different types of heat exchangers. The heat is transferred in the heat exchangers according to the counterflow or parallel flow principle with different fluids.

The heat exchanger to be examined is selected at the switch cabinet. Valves are used to switch between parallel flow and counter flow. The flow rate in the hot water and/or cold water circuit is also adjusted via valves. The hot water flows through the heat exchanger and transfers part of its thermal energy to the cold water in this process.

The trainer is equipped with sensors for differential pressures and temperatures. The flow rate is measured with an electromagnetic flow meter. The measured values can be read on digital displays. At the same time, the measured values can also be transmitted directly to a PC via USB. The data acquisition software is included.

The hot or cold water is supplied from the laboratory or with the accessories WL 312.10 Hot Water Bench and WL 312.11 Cold Water Bench. An optionally available water/steam heat exchanger unit (WL 315.01) and the electrical steam generator (WL 315.02) extend the scope of experiments.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- familiarisation with heat transfer processes
  * heat transfer
  * heat conduction
- measuring of relevant temperatures and flow rates
- determination of the overall heat transfer coefficient
- preparation of temperature curves for the various types of heat exchanger
  * parallel flow
  * counterflow
  * cross parallel flow
  * cross counter flow
- comparison of various types of heat exchanger
  * plate heat exchanger
  * tubular heat exchanger
  * shell and tube heat exchanger
  * finned cross-flow heat exchanger
  * jacketed vessel with stirrer