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.

INSTRUCTIONAL CAPABILITIES

• 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)

TECHNICAL SPECIFICATIONS

HT30X- Computer Controlled Heat Exchanger Service Unit

• A lightweight bench top service unit, designed to accommodate a range of different small scale heat exchangers
• Comprises hot water vessel, bi-directional hot water recirculation pump, cold water control system, computer interface and all necessary instrumentation
• The hot water vessel is made from clear acrylic (for visibility) and includes a 2kW heater with thermostatic over-temperature cut-out and low water level detection
• Hot water direction can easily be reversed using software enabling co-current and counter-current investigations over a wide range of computer controlled flow rates
• The cold water system includes a manually adjustable pressure regulator and a software controlled flow control valve
• Flow rates for both fluid streams in excess of 5L/min are achievable, but this may be restricted by some designs of heat exchanger (e.g. HT32X & HT37X Plate Heat Exchangers)
• Up to twelve temperatures (K and T type thermocouples) can be monitored using the service unit. Operating range, 0-75°C, resolution 0.1°C
• Two flow meters are included. Operating range 0.3 to 10 L/min, resolution 0.1 L/min, operating temperature 0-125°C
• All data is available to a (user supplied) Windows PC, via a USB interface. This computer is also used to manually or automatically control the cold water flow rate, hot water temperature and flow rate, variable speed fan and stirrer
• Full software for educational use is included as standard
• Includes failsafe hardware facilities
• Connects armBUS via LAN to PC.
• 20 Users can connect to view the live readings with in the local network
• Master and view only options available at the time of setup when multiple users operating the machine
• A comprehensive instruction manual is included

FEATURES & BENEFITS

• Small-scale, computer control bench top equipment
• A common service unit avoids unnecessary cost duplication for control and instrumentation
• Multiple accessories representative of industrial heat exchangers
• Computer controlled, including reversing of one of the fluid streams for co-current and counter-current investigations
• armBUS connection via USB
• Full educational software with data logging, control, graph plotting, and detailed “Help”
• Suitable for project work. The service bench provides facilities for evaluating in-house heat exchanger designs
• Fail-safe hardware facilities for remote operation, via NetCan
• 20 users can connect to view the live readings within the local network. (Requires ArmBus-NetCan)
• Full control or read only access available at the time of setup when multiple users are operating the machine
• Educational software, including mimic diagrams, real-time control, data logging and graph plotting
• Embedded software based PID control of hot and cold-water flow
• Standalone operation via ACU Touch Screen option

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