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Description

The HT30X is a service unit which controls the operation of a broad range of Armfield interchangeable small scale heat exchanger modules.

It provides controlled cold water flow, hot water direction can easily be reversed using software control, enabling co-current and counter-current investigations, and the required instrumentation for a series of in-depth investigations into heat exchanger performance. The individual heat exchangers can be quickly changed over, to enable comparisons between different types of heat exchanger to be made.

The HT30X requires a user supplied personal computer for the operator interface. The computer connects the HT30X using a USB interface, providing a simple and straightforward installation and set up procedure.
Once the appropriate heat exchanger has been installed and set up, all other functions can be performed under computer control. Appropriate measures have been implemented so that in the case of computer failure or communications breakdown, the system shuts itself down in a safe manner.

A wide selection of heat exchanger options are available for use with the HT30X. Ranging from simple exchangers to demonstrate co-current and counter-current flow, to reconfigurable systems with interim temperature measurements, capable of being used for in-depth heat exchanger analysis.

The heat exchangers are easily interchanged, with location studs and flexible interconnecting tubes with push connectors.

Training exercises that are common to each of the heat exchangers when used with the HT30X:

• Demonstration of indirect heating/cooling by transfer of heat from one fluid stream to another when separated by a solid wall
• Energy balance determination (heat balance) and calculation of efficiencies by measuring the flow rates and temperature changes in the hot and cold fluid streams
• Introduction to different types of heat exchanger and comparison
• of the differences in operation and performance
• Using the Logarithmic Mean Temperature Difference (LMTD) in heat transfer calculations
• Definition and measurement of Overall Heat Transfer Coefficient (U)
• Demonstration of the differences between counter-current and co-current operation, (not relevant for some HT34X configurations)
• Demonstration of the transition from linear to turbulent flow
• Effect of hot and cold fluid flow rate on the heat transfer coefficient
• Effect of driving force (temperature differential) on the heat transfer coefficient
• Investigation of heat loss and reduction in heat transfer coefficient due to fouling of the heat transfer surfaces (suitable student project using user induced fouling)