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Description

A bench top unit designed to introduce students to the characteristics of a recycle loop and the typical responses under steady state and
unsteady state conditions.
The apparatus consists of a through pipe conveying water from a cold water supply to a suitable drain with a loop of pipework connected
between the supply and drain connections. This recycle loop incorporates a circulating pump and a heater to raise the temperature
of the water in the loop. The heater can be switched on or off to generate step changes when investigating the transient responses
of the recycle loop.
A pair of self-sealing fittings enables a short length of pipe or a reservoir to be connected in series with the recyle loop to change the volume of
the loop and demonstrate the effect of residence time. The arrangement also permits different lengths of flexible tubing to be connected in series
with the loop if it is required to create further changes in residence time.
Water temperatures at the inlet, outlet and within the recycle loop are measured using K-type thermocouples. Water flow rates at the
corresponding locations are measured using miniature turbine type flow sensors. Flow sensors are included at the outlet as well as the inlet to
show that these two flow rates are always equal (a simple principle that is often confusing when water is flowing through the recycle loop).
All power supplies, signal conditioning circuitry etc. are contained inside the moulded ABS support and integral console with appropriate current
protection devices and an RCD for operator protection. Readings from the sensors are displayed on a digital meter with selector switch and
all corresponding signals are routed to an I/O port for connection to a PC using an optional interface device included with educational software package

Key features

• The small-scale of the loop ensures that responses can be fully evaluated in a normal laboratory session
• Water is used as the working fluid for safety and ease of use
• All electrical sensors can be logged using a PC (not supplied)
• Optional teaching software is available for data logging