● Allows Investigation Of Plain And Finned Cross Flow Heat Exchangers.
● Expandable Free & Forced Convection Heat Transfer Investigation
● Allows Investigation Of Local Heat Transfer Coefficient Around A Cylinder.
● Upgradeable to Computerised Data Acquisition.
● Safe and Suitable For Unsupervised Student Operation.
● Responds Rapidly to Control Changes.
● Negligible Operating and Maintenance Costs.
● Two year Warranty.
Introduction
The cross flow heat exchanger is a common component in many engineering applications. The normal configuration involves heat transfer between one fluid flowing through a bundle of tubes and another flowing transversely over the outside of the tubes. The tubes may have extended surfaces internally and/or externally in order to enhance heat transfer between the two fluids.
Typical applications include internal combustion engine radiators, air heaters, refrigeration evaporators and condensers, boiler super heaters and economisers. The Hilton Cross Flow Heat Exchanger H352 can utilise any of a number of optional heat exchanger accessories and in addition may be upgraded for computerised data acquisition.
Together with its optional components the unit allows detailed investigation of heat transfer from plain and finned tube bundles in cross flow as well as free and forced convection from flat and extended surfaces.
The unit will be of particular interest to those studying:
• Mechanical Engineering
• Nuclear Engineering
• Chemical Engineering
• Control and Instrumentation
• Plant and Process Engineering
• Building Services
• Engineering Physics
• Refrigeration
• Marine Engineering
Optional Heat Exchanger Accessories
Refer to individual data sheets for details;
H352A Plain Tube and Tube Bundle in Cross Flow.
H352B Local Heat Transfer Element.
H352C Finned Tube Bundle in Cross Flow.
H352D Free and Forced Convection from Flat, Pinned and Finned Plates.
H352E Heat Pipe Investigation Accessory.
H352F Pitot Static Traverse Plate
H352G Water to Air Heat Exchanger Accessory
HC352 Computer Data Acquisition Upgrade.
Experimental Capabilities
For detailed descriptions and experimental capabilities of the Cross Flow Heat Exchanger H352 with the optional heat exchanger accessories refer to individual data sheets for each optional heat exchanger accessory.
Description
A vertically mounted rectangular section duct with an opaque plastic front cover is connected at its lower end to the intake of a powerful variable speed fan. At the upper end of the duct is a bell mouth air intake. Air is drawn by the fan into the duct and past the heat exchanger accessory before being discharged from the fan.
A pair of manometers allows measurement of the pressure drop across the intake from which the air velocity in the duct may be determined.
At the maximum air velocity (up to 30m/s), the Reynolds number (based on the diameter of a single tube across the duct) is approximately 37,000.
Situated at approximately mid height in the front of the duct is an opening into which any of the various heat exchanger accessories may be located.
Each of the optional heat exchanger accessories is serviced by an instrumentation and control console supplied as part of the Cross Flow Heat Exchanger H352.
The console provides control and measurement of low voltage power to the optional heat exchanger accessories and allows measurement of all the relevant heat exchanger and air stream temperatures. For operator safety the instrumentation console limits all heat exchanger accessories to approximately 100°C and contains electrical overload and earth leakage protection.
The instrumentation and control console also enables installation of the optional computerised data acquisition upgrade that may be either factory fitted or user installed at a later date.
