TRLB Recycle Loops Unit

RECYCLE LOOPS UNIT - TRLB

INNOVATIVE SYSTEMS

The Recycle Loops Unit, "TRLB", has been designed to demonstrate, both visually and experimentally, what a recycle loop is and how itworks.

See general description

General Description

The Recycle Loops Unit, "TRLB", has been designed to demonstrate, both visually and experimentally, what a recycle loop is and how itworks. It has many teaching applications, among them the performance of mass and energy balances under stable and unstable stateconditions.

In this unit an inlet water flow is thermally conditioned in a recycle loop to obtain an outlet water flow that fits the desired conditions.

The unit consists of a tube that carries water from the cold water supply to a drain and a loop connected between the supply and the drainconnections. This recycle loop includes a pump and a heating element to increase the water temperature inside the loop.

Different volumes of the recycle loop can be selected by just opening the corresponding valve.

The residence time of each configuration can be studied. The loop flow variation has important didactic properties. The recycle loop isregulated through that variation.

The water temperature at the inlet, outlet and inside the loop are measured with temperature sensors. The water flows in the correspondingpoints are measured with flow sensors.

Exercises and guided practices

GUIDED PRACTICAL EXERCISES INCLUDED IN THE MANUAL

  1. Understanding the meaning of Water Recycle Loop.

Mass balances of steady state:

  1. Mass balance in the recycle loop in stationary regime withdifferent water proportion in recirculation and different loops.

Heat balances of unsteady state:

  1. Determination of the recycle loop system response faced,when the heating element is switched on, at different flow ratesand different loops.
  2. Determination of the recycle loop system response faced,when the heating element is switched off, at different flow ratesand different loops.

Heat balances of steady state:

  1. Thermal balance in the recycle loop in stationary regime withdifferent water proportions in recirculation and different loops.

MORE PRACTICAL EXERCISES TO BE DONE WITH THE UNIT

Mass balances of steady state:

  1. Demonstrating that whatever the recycle rate, the inlet flowrate equals the outlet flow rate.

Heat balances of unsteady state:

  1. Study of the effect of change the inlet flow.
  2. Study of the effect of recycle with no through flow.

Heat balances of steady state:

  1. Checking the variation of the outlet temperature, with theheating element switched on and a fixed water flow at theinlet, caused by different recycled flow.
  2. Determination of the heat quantity absorbed in the recycleloop.
  3. Use of the steady flow energy equation for the overall system.
  4. Use of the steady flow energy equation for different points ofthe system.
  5. Study of the system response when the recycle flow is changed.
  6. Study of the system response when the inlet-outlet flow ischanged.
  7. Study of the system response when the recycle volume ischanged.
  8. Study of the system response when the heating element poweris changed.
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