Electrical Air Heaters (HRR)

Description

T+H air heaters type HRR consist of tubular heaters or finned tubular heaters assembled into a sheet metal housing made of zinc plated steel or stainless steel. According to the requirements given by the specification the housings can be adapted to various applications. For most applications finned tubular heating elements are used as their increased surface allows low surface temperatures on the heating elements thus providing a low watt density and a long lifetime with reduced housing dimensions.

By means of electrical interlock it has to be ensured that the heater can only be operated when a fan has been activated. In order to prevent the air filter from overheating and to avoid a too high outlet temperature the air heaters can be equipped with a thermostat and/or a temperature limiter.

Versions and configurations

Standard version

In general we manufacture air heaters according to your specifications. For duct air heaters with air outlet temperatures below 80°C the following dimensions of H are favorable because we can use standard air heaters.

Preferred dimensions H:

• 250 mm
• 320 mm
• 400 mm
• 500 mm
• 630 mm
• 800 mm

Configurations and specifications

• Flange heaters HRF or HRF-AK
• Cylindrical air heaters HRZ with the preferential diameters 100 mm, 125 mm, 150 mm, 200 mm, 250 mm and 300 mm
• Heaters for higher air temperatures with set off terminal box (AK)
• Protection degree of the connection box up to IP64
• Air space sealed by welding
• Insulation resistance > 10 MΩ
• Silicone-free execution
• Operating voltages between 24 V and 3 x 690 V
• Specification of the switching steps
• Version with thermocouple mounted at the air heater
• Low temperatures at the heating element
• Low pressure losses
• For maritime applications, heaters conform to GL/DNV guidelines

Connection

The connection of the leads is effected by sheath clips, which are placed on the connections of the heating elements. Special versions using plug connectors at the housing or contact clamp blocks are possible. Pre-fitted automatic controllers and/or limiters mounted are intended to integrate with the control of the air heater. The automatic controller is usually used as safety feature which is switched first.

Materials

The housings are made of galvanized steel or high-grade steel 1.4301.
The tubular heating elements are manufactured of high-grade steel 1.4541 and the finning is produced of high-grade steel 1.4541 or steel 1.0112.

Possible sheath materials of plain tubular heating elements:
1.4541, 1.4828, 1.4876 and 2.4858

Other materials on request.

Documentation

You receive a data sheet of the desired heating element with a principle sketch and all important technical details.

Calculations

All formulas for calculating the required power for heating air and gases can be found in the Catalogue Air Heaters.