Double heat exchanger/Pre-set version

The double heat exchanger is designed to control the
temperature in a deck decompression chamber, self-propelled
hyperbaric lifeboat or tunnelling transfer shuttle.
This combi-unit consists of a heat and cool exchanger.

Product description

Double Heat Exchanger

The double heat exchanger controls the chamber atmosphere to a preset temperature through a thermostat controller. Its completely cast construction and brushless motor support dependable operation in demanding hyperbaric environments.

Continuous Temperature Control

Environmental conditions such as oxygen level, humidity and pressure do not affect the motor. The heat exchanger is designed for continuous operation during diving activities.

An optional fan speed control unit with temperature control is required to operate the double heat exchanger. The motor runs between 1400 and 4000 rpm, while the unit supports operating pressures up to 42 bar (420 msw).

Performance

Cooling performance depends on environmental conditions, including helium content, chamber pressure, temperature and motor speed. Under the stated test conditions, heat transfer exceeds 1.4 kWh in air, 3.5 kWh in Trimix and 5.5 kWh in Heliox at high fan speed.

Specifications

Specification	Detail
Power supply	24–28 VDC, 3.15 A
Rotating speed	1400–4000 rpm
Operating pressure	Max. 42 bar (420 msw)
Cold/Hot water flow	12 liter/min
Cold water temperature	60°C
Pressure difference heat exchanger	> 0.4 bar
Air cooling conditions	1.3 bar (a), cold water supply 12 l/min at 4°C, internal temperature 25°C
Heat transfer in air	> 1.4 kWh (fan speed high)
Trimix cooling conditions	50% He, 6 bar (a), cold water supply 12 l/min at 4°C, internal temperature 28°C
Heat transfer in Trimix	> 3.5 kWh (fan speed high)
Heliox cooling conditions	90% He, 10 bar (a), cold water supply 12 l/min at 4°C, internal temperature 28°C
Heat transfer in Heliox	> 5.5 kWh (fan speed high)
Performance factors	Presence of helium, chamber pressure, temperature, motor speed
Control requirement	Optional fan speed control unit with temperature control

Features

Preset temperature control via thermostat controller
Completely cast construction
Brushless motor
Motor performance unaffected by oxygen level, humidity or pressure
Designed for continuous operation during diving
Optional fan speed and temperature control unit required
Suitable for operation in air, Trimix and Heliox
Cooling performance varies with helium content, pressure, temperature and motor speed