DESCRIPTION

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 HT35X, 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.

TECHNICAL SPECIFICATIONS

• This unit consists of a PVC rectangular duct, variable speed axial fan and a single fan radiator
• The radiator is accommodated in the middle and across the air duct
• The axial fan is located between the radiator and one edge of the duct. It can provide max air velocity of 4m/s
• The fins of the radiator are made from copper and allow a heat transfer area of 11,000mm2
• Four thermocouples measure the base unit and accessory’s input and output water as well as the air temperatures
• Quick release hot fluid connections allow rapid connection to HT30X
• The exercises proposed with the HT35X provide function of basic engineering concepts such as psychometric properties and mathematical iteration
• The HT35X software includes application of the LMTD (Log Mean Temperature Difference) method for cross flow heat exchanger as well as the effectiveness – NTU (Number of Transfer Units) method
• An air velocity sensor provides measurement of air flow inside the duct, which can be directly observed on the units software
• The HT35X software is an interactive tool for high understanding of the factors and variables involved in cross flow heat exchange

FEATURES & BENEFITS

• A small scale cross flow heat exchanger system for use with the Armfield Computer Controlled 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 HT35X enables variation of the parameters involved in the  cross flow exchange process and therefore a complete analysis of the phenomena
• Thermocouples measure the inlet and outlet water from the base unit and air temperatures. The the air velocity sensor connects to the HT30X, 0-10m/s
• The air mass flow rate is derived using an air velocity sensor
• The HT35X is mounted on a PVC baseplate which is designed to be installed on the plinth of the Computer Controlled Heat Exchanger Service Unit without the need for tools
• A comprehensive instruction manual is included

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