Armfield - Heat Transfer - HT30XC Computer Controlled Heat Exchanger Service Module

The tubular heat exchanger is the simplest form of heat exchanger and consists of two concentric (coaxial) tubes carrying the hot and cold fluids. In these miniature versions the tubes are separated into sections to reduce the overall length and to allow the temperature at points along both fluid streams to be measured. Two versions are available, the HT31 is a basic version with two sections and a single interim temperature measurement point. The HT36 is a more sophisticated unit with four longer tube sections, giving four times the overall heat transfer area and three interim temperature measurement points in each fluid stream.

The HT36 has sufficient heat transfer area to demonstrate the classic counter current flow conditions where the outlet of the heated stream is hotter than the outlet of the cooled stream.

Key Features

• A small-scale Tubular Heat Exchanger system for use with an Armfield Heat Exchange Service Unit to teach the fundamental concepts of heat exchangers
• Comprises a number of sections of concentric tubes, the outer section constructed from clear acrylic for visibility and the inner tube from stainless steel
• The tubes are easily dismantled for cleaning
• A comprehensive instruction manual is included

The plate heat exchanger is extremely versatile and commonly used in the food and chemical processing industries. Different combinations of plates and gaskets can be arranged to suit a particular application. The miniature exchanger supplied consists of a pack of plates with sealing gaskets held together in a frame between end plates. Hot and cold fluids flow between channels on alternate sides of the plates to promote heat transfer.

Key Features

• A small-scale plate heat exchanger system for use with an Armfield Heat Exchange Service Unit to teach the fundamental concepts of heat exchangers
• Comprises a number of stainless steel plates, each with a pressed chevron pattern and a food-grade silicon rubber sealing gasket, mounted in a frame
• Easily dismantled for cleaning
• A comprehensive instruction manual is included

The shell and tube heat exchanger is commonly used in the food and chemical process industries. This type of exchanger consists of a number of tubes in parallel enclosed in a cylindrical shell. Heat is transferred between one fluid flowing through the tubes and another fluid flowing through the cylindrical shell around the tubes.

The miniature exchanger supplied is designed to demonstrate liquid-to-liquid heat transfer in a 1-7 shell and tube heat exchanger (one shell and seven tubes with two transverse baffles in the shell).

Key Features

• A miniature shell and tube heat exchanger for use with an Armfield Heat Exchanger Service Unit
• Comprises an outer shell and seven internal tubes. There are two transverse baffles inside the shell
• Four temperature sensors are supplied in tappings at fluid inlets and outlets
• The heat exchanger is constructed from stainless steel tube and clear acrylic. It is mounted on a PVC baseplate, which is designed to be installed on the plinth of the Heat Exchanger Service Unit without the need for tools
• The stainless steel tubes can be removed from the heat exchanger for cleaning
• A comprehensive instruction manual is included

Vessel heating or cooling of a process liquid in a tank, either batchwise or with continuous product feed, is common practice throughout industry.

The characteristics of the heat transfer using an external jacket or internal coil can be demonstrated together with the effect of stirring the vessel contents.

Key Features

• Miniature jacketed vessel heat exchanger system for use with an Armfield Heat Exchanger Service Unit
• Comprises processing vessel with outer jacket, inner coil, variable-speed stirrer and baffle
• K-Type thermocouples measure the vessel contents and the inlet and outlet temperature of both fluid streams (6 in total)
• The Heat Exchanger is designed to be installed on the service unit without the need for tools
• A comprehensive instruction manual describing how to carry out the laboratory teaching exercises in combined radiation and convection (free and forced) and their analysis as well as assembly, installation and commissioning is included

The Cross Flow Heat Exchanger is commonly used in applications such as heating, ventilating and air conditioning. It is also encountered as vehicle engine radiator.

This type of heat exchange occurs when the flow direction of the two fluids cross each other. In the HT35, hot water flows in and out of a radiator, perpendicular to air stream, which is being pulled into the radiator by an axial fan.

The convection between the two fluids through fins surface on the radiator implements the heat exchange.

Key Features

• A small-scale cross flow heat exchanger system for use with the Armfield Heat Exchanger Service unit to teach the fundamentals concepts of heat transfer
• Some parts in the heat exchanger such as probes and axial fan can be easily removed for cleaning
• The unit enables variation of the parameters involved in the cross-flow exchange process and therefore a complete analysis of the phenomena
• K-type thermocouples measure the inlet and outlet water and air temperatures, as well as permitting the connection of the air velocity sensor to the HT30XC
• The air mass flow rate is derived using an air velocity sensor
• The unit is mounted on a PVC baseplate, which is designed to be installed on the plinth of the Heat Exchanger Unit without the need for tools
• A comprehensive instruction manual is included