Armfield Engineering Education
HEAT TRANSFER AND THERMODYNAMICS
HT31/HT36 Tubular Heat Exchangers - Issue 1
HT31 - Tubular Heat Exchanger
HT36 - Extended Tubular Heat Exchanger
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.
Ordering Specification
• 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.
Technical Description
On both heat exchangers the inner tube is used for the hot fluid and the outer annulus for cold fluid. This minimises heat loss from the exchanger without the need for additional insulation. The inner tubes are constructed from stainless steel and the outer annulus from clear acrylic, providing visualisation of the heat exchanger construction and minimising thermal losses. The tubes can be dismantled for cleaning.
HT31 HT36
Temperature measurement points: 6 off:
• Hot fluid inlet
• Hot fluid mid-position
• Hot fluid outlet
• Cold fluid inlet
• Cold fluid mid-position
• Cold fluid outlet 10 off:
• Hot fluid inlet
• Hot fluid interim positions (3)
• Hot fluid outlet
• Cold fluid inlet
• Cold fluid interim positions (3)
• Cold fluid outlet
Number of tube sections: 2 4
(can also be configured for
1, 2 or 3 sections)
Heat transfer area: 0.02m2 0.08m2 max.
Essential Armfield Accessories
HT36 requires the Armfield HT30XC, Computer Controlled Heat Exchanger Service Unit.
HT31 can be used with either the HT30XC or the HT30X Heat Exchanger Service Unit.
Shipping Specification
HT31:
Volume: 0.05m³
Gross weight 4 kg
HT36:
Volume: 0.1m³
Gross Weight: 10kg
Overall dimensions
HT31:
Height: 0.16m
Width: 0.51m
Depth: 0.39m
HT36:
Height: 0.2m
Width: 0.95m
Depth: 0.4m
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